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Add vendoring to containerd master

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Initial vendor list validated with empty $GOPATH
and only master checked out; followed by `make`
and verified that all binaries build properly.
Updates require github.com/LK4D4/vndr tool.

Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com>
This commit is contained in:
Phil Estes 2016-12-16 12:03:35 -05:00
parent 286ea04591
commit dd9309c15e
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GPG key ID: 0F386284C03A1162
407 changed files with 113562 additions and 0 deletions
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28
vendor/google.golang.org/grpc/LICENSE generated vendored Normal file
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Copyright 2014, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

22
vendor/google.golang.org/grpc/PATENTS generated vendored Normal file
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Additional IP Rights Grant (Patents)
"This implementation" means the copyrightable works distributed by
Google as part of the gRPC project.
Google hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section)
patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of gRPC, where such license applies only to those patent
claims, both currently owned or controlled by Google and acquired in
the future, licensable by Google that are necessarily infringed by this
implementation of gRPC. This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation. If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of gRPC or any code incorporated within this
implementation of gRPC constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for this implementation of gRPC
shall terminate as of the date such litigation is filed.

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vendor/google.golang.org/grpc/backoff.go generated vendored Normal file
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package grpc
import (
"math/rand"
"time"
)
// DefaultBackoffConfig uses values specified for backoff in
// https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md.
var (
DefaultBackoffConfig = BackoffConfig{
MaxDelay: 120 * time.Second,
baseDelay: 1.0 * time.Second,
factor: 1.6,
jitter: 0.2,
}
)
// backoffStrategy defines the methodology for backing off after a grpc
// connection failure.
//
// This is unexported until the gRPC project decides whether or not to allow
// alternative backoff strategies. Once a decision is made, this type and its
// method may be exported.
type backoffStrategy interface {
// backoff returns the amount of time to wait before the next retry given
// the number of consecutive failures.
backoff(retries int) time.Duration
}
// BackoffConfig defines the parameters for the default gRPC backoff strategy.
type BackoffConfig struct {
// MaxDelay is the upper bound of backoff delay.
MaxDelay time.Duration
// TODO(stevvooe): The following fields are not exported, as allowing
// changes would violate the current gRPC specification for backoff. If
// gRPC decides to allow more interesting backoff strategies, these fields
// may be opened up in the future.
// baseDelay is the amount of time to wait before retrying after the first
// failure.
baseDelay time.Duration
// factor is applied to the backoff after each retry.
factor float64
// jitter provides a range to randomize backoff delays.
jitter float64
}
func setDefaults(bc *BackoffConfig) {
md := bc.MaxDelay
*bc = DefaultBackoffConfig
if md > 0 {
bc.MaxDelay = md
}
}
func (bc BackoffConfig) backoff(retries int) time.Duration {
if retries == 0 {
return bc.baseDelay
}
backoff, max := float64(bc.baseDelay), float64(bc.MaxDelay)
for backoff < max && retries > 0 {
backoff *= bc.factor
retries--
}
if backoff > max {
backoff = max
}
// Randomize backoff delays so that if a cluster of requests start at
// the same time, they won't operate in lockstep.
backoff *= 1 + bc.jitter*(rand.Float64()*2-1)
if backoff < 0 {
return 0
}
return time.Duration(backoff)
}

400
vendor/google.golang.org/grpc/balancer.go generated vendored Normal file
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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"fmt"
"sync"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/naming"
)
// Address represents a server the client connects to.
// This is the EXPERIMENTAL API and may be changed or extended in the future.
type Address struct {
// Addr is the server address on which a connection will be established.
Addr string
// Metadata is the information associated with Addr, which may be used
// to make load balancing decision.
Metadata interface{}
}
// BalancerConfig specifies the configurations for Balancer.
type BalancerConfig struct {
// DialCreds is the transport credential the Balancer implementation can
// use to dial to a remote load balancer server. The Balancer implementations
// can ignore this if it does not need to talk to another party securely.
DialCreds credentials.TransportCredentials
}
// BalancerGetOptions configures a Get call.
// This is the EXPERIMENTAL API and may be changed or extended in the future.
type BalancerGetOptions struct {
// BlockingWait specifies whether Get should block when there is no
// connected address.
BlockingWait bool
}
// Balancer chooses network addresses for RPCs.
// This is the EXPERIMENTAL API and may be changed or extended in the future.
type Balancer interface {
// Start does the initialization work to bootstrap a Balancer. For example,
// this function may start the name resolution and watch the updates. It will
// be called when dialing.
Start(target string, config BalancerConfig) error
// Up informs the Balancer that gRPC has a connection to the server at
// addr. It returns down which is called once the connection to addr gets
// lost or closed.
// TODO: It is not clear how to construct and take advantage of the meaningful error
// parameter for down. Need realistic demands to guide.
Up(addr Address) (down func(error))
// Get gets the address of a server for the RPC corresponding to ctx.
// i) If it returns a connected address, gRPC internals issues the RPC on the
// connection to this address;
// ii) If it returns an address on which the connection is under construction
// (initiated by Notify(...)) but not connected, gRPC internals
// * fails RPC if the RPC is fail-fast and connection is in the TransientFailure or
// Shutdown state;
// or
// * issues RPC on the connection otherwise.
// iii) If it returns an address on which the connection does not exist, gRPC
// internals treats it as an error and will fail the corresponding RPC.
//
// Therefore, the following is the recommended rule when writing a custom Balancer.
// If opts.BlockingWait is true, it should return a connected address or
// block if there is no connected address. It should respect the timeout or
// cancellation of ctx when blocking. If opts.BlockingWait is false (for fail-fast
// RPCs), it should return an address it has notified via Notify(...) immediately
// instead of blocking.
//
// The function returns put which is called once the rpc has completed or failed.
// put can collect and report RPC stats to a remote load balancer.
//
// This function should only return the errors Balancer cannot recover by itself.
// gRPC internals will fail the RPC if an error is returned.
Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error)
// Notify returns a channel that is used by gRPC internals to watch the addresses
// gRPC needs to connect. The addresses might be from a name resolver or remote
// load balancer. gRPC internals will compare it with the existing connected
// addresses. If the address Balancer notified is not in the existing connected
// addresses, gRPC starts to connect the address. If an address in the existing
// connected addresses is not in the notification list, the corresponding connection
// is shutdown gracefully. Otherwise, there are no operations to take. Note that
// the Address slice must be the full list of the Addresses which should be connected.
// It is NOT delta.
Notify() <-chan []Address
// Close shuts down the balancer.
Close() error
}
// downErr implements net.Error. It is constructed by gRPC internals and passed to the down
// call of Balancer.
type downErr struct {
timeout bool
temporary bool
desc string
}
func (e downErr) Error() string { return e.desc }
func (e downErr) Timeout() bool { return e.timeout }
func (e downErr) Temporary() bool { return e.temporary }
func downErrorf(timeout, temporary bool, format string, a ...interface{}) downErr {
return downErr{
timeout: timeout,
temporary: temporary,
desc: fmt.Sprintf(format, a...),
}
}
// RoundRobin returns a Balancer that selects addresses round-robin. It uses r to watch
// the name resolution updates and updates the addresses available correspondingly.
func RoundRobin(r naming.Resolver) Balancer {
return &roundRobin{r: r}
}
type addrInfo struct {
addr Address
connected bool
}
type roundRobin struct {
r naming.Resolver
w naming.Watcher
addrs []*addrInfo // all the addresses the client should potentially connect
mu sync.Mutex
addrCh chan []Address // the channel to notify gRPC internals the list of addresses the client should connect to.
next int // index of the next address to return for Get()
waitCh chan struct{} // the channel to block when there is no connected address available
done bool // The Balancer is closed.
}
func (rr *roundRobin) watchAddrUpdates() error {
updates, err := rr.w.Next()
if err != nil {
grpclog.Printf("grpc: the naming watcher stops working due to %v.\n", err)
return err
}
rr.mu.Lock()
defer rr.mu.Unlock()
for _, update := range updates {
addr := Address{
Addr: update.Addr,
Metadata: update.Metadata,
}
switch update.Op {
case naming.Add:
var exist bool
for _, v := range rr.addrs {
if addr == v.addr {
exist = true
grpclog.Println("grpc: The name resolver wanted to add an existing address: ", addr)
break
}
}
if exist {
continue
}
rr.addrs = append(rr.addrs, &addrInfo{addr: addr})
case naming.Delete:
for i, v := range rr.addrs {
if addr == v.addr {
copy(rr.addrs[i:], rr.addrs[i+1:])
rr.addrs = rr.addrs[:len(rr.addrs)-1]
break
}
}
default:
grpclog.Println("Unknown update.Op ", update.Op)
}
}
// Make a copy of rr.addrs and write it onto rr.addrCh so that gRPC internals gets notified.
open := make([]Address, len(rr.addrs))
for i, v := range rr.addrs {
open[i] = v.addr
}
if rr.done {
return ErrClientConnClosing
}
rr.addrCh <- open
return nil
}
func (rr *roundRobin) Start(target string, config BalancerConfig) error {
rr.mu.Lock()
defer rr.mu.Unlock()
if rr.done {
return ErrClientConnClosing
}
if rr.r == nil {
// If there is no name resolver installed, it is not needed to
// do name resolution. In this case, target is added into rr.addrs
// as the only address available and rr.addrCh stays nil.
rr.addrs = append(rr.addrs, &addrInfo{addr: Address{Addr: target}})
return nil
}
w, err := rr.r.Resolve(target)
if err != nil {
return err
}
rr.w = w
rr.addrCh = make(chan []Address)
go func() {
for {
if err := rr.watchAddrUpdates(); err != nil {
return
}
}
}()
return nil
}
// Up sets the connected state of addr and sends notification if there are pending
// Get() calls.
func (rr *roundRobin) Up(addr Address) func(error) {
rr.mu.Lock()
defer rr.mu.Unlock()
var cnt int
for _, a := range rr.addrs {
if a.addr == addr {
if a.connected {
return nil
}
a.connected = true
}
if a.connected {
cnt++
}
}
// addr is only one which is connected. Notify the Get() callers who are blocking.
if cnt == 1 && rr.waitCh != nil {
close(rr.waitCh)
rr.waitCh = nil
}
return func(err error) {
rr.down(addr, err)
}
}
// down unsets the connected state of addr.
func (rr *roundRobin) down(addr Address, err error) {
rr.mu.Lock()
defer rr.mu.Unlock()
for _, a := range rr.addrs {
if addr == a.addr {
a.connected = false
break
}
}
}
// Get returns the next addr in the rotation.
func (rr *roundRobin) Get(ctx context.Context, opts BalancerGetOptions) (addr Address, put func(), err error) {
var ch chan struct{}
rr.mu.Lock()
if rr.done {
rr.mu.Unlock()
err = ErrClientConnClosing
return
}
if len(rr.addrs) > 0 {
if rr.next >= len(rr.addrs) {
rr.next = 0
}
next := rr.next
for {
a := rr.addrs[next]
next = (next + 1) % len(rr.addrs)
if a.connected {
addr = a.addr
rr.next = next
rr.mu.Unlock()
return
}
if next == rr.next {
// Has iterated all the possible address but none is connected.
break
}
}
}
if !opts.BlockingWait {
if len(rr.addrs) == 0 {
rr.mu.Unlock()
err = Errorf(codes.Unavailable, "there is no address available")
return
}
// Returns the next addr on rr.addrs for failfast RPCs.
addr = rr.addrs[rr.next].addr
rr.next++
rr.mu.Unlock()
return
}
// Wait on rr.waitCh for non-failfast RPCs.
if rr.waitCh == nil {
ch = make(chan struct{})
rr.waitCh = ch
} else {
ch = rr.waitCh
}
rr.mu.Unlock()
for {
select {
case <-ctx.Done():
err = ctx.Err()
return
case <-ch:
rr.mu.Lock()
if rr.done {
rr.mu.Unlock()
err = ErrClientConnClosing
return
}
if len(rr.addrs) > 0 {
if rr.next >= len(rr.addrs) {
rr.next = 0
}
next := rr.next
for {
a := rr.addrs[next]
next = (next + 1) % len(rr.addrs)
if a.connected {
addr = a.addr
rr.next = next
rr.mu.Unlock()
return
}
if next == rr.next {
// Has iterated all the possible address but none is connected.
break
}
}
}
// The newly added addr got removed by Down() again.
if rr.waitCh == nil {
ch = make(chan struct{})
rr.waitCh = ch
} else {
ch = rr.waitCh
}
rr.mu.Unlock()
}
}
}
func (rr *roundRobin) Notify() <-chan []Address {
return rr.addrCh
}
func (rr *roundRobin) Close() error {
rr.mu.Lock()
defer rr.mu.Unlock()
rr.done = true
if rr.w != nil {
rr.w.Close()
}
if rr.waitCh != nil {
close(rr.waitCh)
rr.waitCh = nil
}
if rr.addrCh != nil {
close(rr.addrCh)
}
return nil
}

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vendor/google.golang.org/grpc/call.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"bytes"
"io"
"math"
"time"
"golang.org/x/net/context"
"golang.org/x/net/trace"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/transport"
)
// recvResponse receives and parses an RPC response.
// On error, it returns the error and indicates whether the call should be retried.
//
// TODO(zhaoq): Check whether the received message sequence is valid.
// TODO ctx is used for stats collection and processing. It is the context passed from the application.
func recvResponse(ctx context.Context, dopts dialOptions, t transport.ClientTransport, c *callInfo, stream *transport.Stream, reply interface{}) (err error) {
// Try to acquire header metadata from the server if there is any.
defer func() {
if err != nil {
if _, ok := err.(transport.ConnectionError); !ok {
t.CloseStream(stream, err)
}
}
}()
c.headerMD, err = stream.Header()
if err != nil {
return
}
p := &parser{r: stream}
var inPayload *stats.InPayload
if stats.On() {
inPayload = &stats.InPayload{
Client: true,
}
}
for {
if err = recv(p, dopts.codec, stream, dopts.dc, reply, math.MaxInt32, inPayload); err != nil {
if err == io.EOF {
break
}
return
}
}
if inPayload != nil && err == io.EOF && stream.StatusCode() == codes.OK {
// TODO in the current implementation, inTrailer may be handled before inPayload in some cases.
// Fix the order if necessary.
stats.HandleRPC(ctx, inPayload)
}
c.trailerMD = stream.Trailer()
return nil
}
// sendRequest writes out various information of an RPC such as Context and Message.
func sendRequest(ctx context.Context, codec Codec, compressor Compressor, callHdr *transport.CallHdr, t transport.ClientTransport, args interface{}, opts *transport.Options) (_ *transport.Stream, err error) {
stream, err := t.NewStream(ctx, callHdr)
if err != nil {
return nil, err
}
defer func() {
if err != nil {
// If err is connection error, t will be closed, no need to close stream here.
if _, ok := err.(transport.ConnectionError); !ok {
t.CloseStream(stream, err)
}
}
}()
var (
cbuf *bytes.Buffer
outPayload *stats.OutPayload
)
if compressor != nil {
cbuf = new(bytes.Buffer)
}
if stats.On() {
outPayload = &stats.OutPayload{
Client: true,
}
}
outBuf, err := encode(codec, args, compressor, cbuf, outPayload)
if err != nil {
return nil, Errorf(codes.Internal, "grpc: %v", err)
}
err = t.Write(stream, outBuf, opts)
if err == nil && outPayload != nil {
outPayload.SentTime = time.Now()
stats.HandleRPC(ctx, outPayload)
}
// t.NewStream(...) could lead to an early rejection of the RPC (e.g., the service/method
// does not exist.) so that t.Write could get io.EOF from wait(...). Leave the following
// recvResponse to get the final status.
if err != nil && err != io.EOF {
return nil, err
}
// Sent successfully.
return stream, nil
}
// Invoke sends the RPC request on the wire and returns after response is received.
// Invoke is called by generated code. Also users can call Invoke directly when it
// is really needed in their use cases.
func Invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) error {
if cc.dopts.unaryInt != nil {
return cc.dopts.unaryInt(ctx, method, args, reply, cc, invoke, opts...)
}
return invoke(ctx, method, args, reply, cc, opts...)
}
func invoke(ctx context.Context, method string, args, reply interface{}, cc *ClientConn, opts ...CallOption) (e error) {
c := defaultCallInfo
for _, o := range opts {
if err := o.before(&c); err != nil {
return toRPCErr(err)
}
}
defer func() {
for _, o := range opts {
o.after(&c)
}
}()
if EnableTracing {
c.traceInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
defer c.traceInfo.tr.Finish()
c.traceInfo.firstLine.client = true
if deadline, ok := ctx.Deadline(); ok {
c.traceInfo.firstLine.deadline = deadline.Sub(time.Now())
}
c.traceInfo.tr.LazyLog(&c.traceInfo.firstLine, false)
// TODO(dsymonds): Arrange for c.traceInfo.firstLine.remoteAddr to be set.
defer func() {
if e != nil {
c.traceInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{e}}, true)
c.traceInfo.tr.SetError()
}
}()
}
if stats.On() {
ctx = stats.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method})
begin := &stats.Begin{
Client: true,
BeginTime: time.Now(),
FailFast: c.failFast,
}
stats.HandleRPC(ctx, begin)
}
defer func() {
if stats.On() {
end := &stats.End{
Client: true,
EndTime: time.Now(),
Error: e,
}
stats.HandleRPC(ctx, end)
}
}()
topts := &transport.Options{
Last: true,
Delay: false,
}
for {
var (
err error
t transport.ClientTransport
stream *transport.Stream
// Record the put handler from Balancer.Get(...). It is called once the
// RPC has completed or failed.
put func()
)
// TODO(zhaoq): Need a formal spec of fail-fast.
callHdr := &transport.CallHdr{
Host: cc.authority,
Method: method,
}
if cc.dopts.cp != nil {
callHdr.SendCompress = cc.dopts.cp.Type()
}
gopts := BalancerGetOptions{
BlockingWait: !c.failFast,
}
t, put, err = cc.getTransport(ctx, gopts)
if err != nil {
// TODO(zhaoq): Probably revisit the error handling.
if _, ok := err.(*rpcError); ok {
return err
}
if err == errConnClosing || err == errConnUnavailable {
if c.failFast {
return Errorf(codes.Unavailable, "%v", err)
}
continue
}
// All the other errors are treated as Internal errors.
return Errorf(codes.Internal, "%v", err)
}
if c.traceInfo.tr != nil {
c.traceInfo.tr.LazyLog(&payload{sent: true, msg: args}, true)
}
stream, err = sendRequest(ctx, cc.dopts.codec, cc.dopts.cp, callHdr, t, args, topts)
if err != nil {
if put != nil {
put()
put = nil
}
// Retry a non-failfast RPC when
// i) there is a connection error; or
// ii) the server started to drain before this RPC was initiated.
if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
if c.failFast {
return toRPCErr(err)
}
continue
}
return toRPCErr(err)
}
err = recvResponse(ctx, cc.dopts, t, &c, stream, reply)
if err != nil {
if put != nil {
put()
put = nil
}
if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
if c.failFast {
return toRPCErr(err)
}
continue
}
return toRPCErr(err)
}
if c.traceInfo.tr != nil {
c.traceInfo.tr.LazyLog(&payload{sent: false, msg: reply}, true)
}
t.CloseStream(stream, nil)
if put != nil {
put()
put = nil
}
return Errorf(stream.StatusCode(), "%s", stream.StatusDesc())
}
}

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vendor/google.golang.org/grpc/clientconn.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"errors"
"fmt"
"net"
"strings"
"sync"
"time"
"golang.org/x/net/context"
"golang.org/x/net/trace"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/transport"
)
var (
// ErrClientConnClosing indicates that the operation is illegal because
// the ClientConn is closing.
ErrClientConnClosing = errors.New("grpc: the client connection is closing")
// ErrClientConnTimeout indicates that the ClientConn cannot establish the
// underlying connections within the specified timeout.
ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
// errNoTransportSecurity indicates that there is no transport security
// being set for ClientConn. Users should either set one or explicitly
// call WithInsecure DialOption to disable security.
errNoTransportSecurity = errors.New("grpc: no transport security set (use grpc.WithInsecure() explicitly or set credentials)")
// errTransportCredentialsMissing indicates that users want to transmit security
// information (e.g., oauth2 token) which requires secure connection on an insecure
// connection.
errTransportCredentialsMissing = errors.New("grpc: the credentials require transport level security (use grpc.WithTransportCredentials() to set)")
// errCredentialsConflict indicates that grpc.WithTransportCredentials()
// and grpc.WithInsecure() are both called for a connection.
errCredentialsConflict = errors.New("grpc: transport credentials are set for an insecure connection (grpc.WithTransportCredentials() and grpc.WithInsecure() are both called)")
// errNetworkIO indicates that the connection is down due to some network I/O error.
errNetworkIO = errors.New("grpc: failed with network I/O error")
// errConnDrain indicates that the connection starts to be drained and does not accept any new RPCs.
errConnDrain = errors.New("grpc: the connection is drained")
// errConnClosing indicates that the connection is closing.
errConnClosing = errors.New("grpc: the connection is closing")
// errConnUnavailable indicates that the connection is unavailable.
errConnUnavailable = errors.New("grpc: the connection is unavailable")
errNoAddr = errors.New("grpc: there is no address available to dial")
// minimum time to give a connection to complete
minConnectTimeout = 20 * time.Second
)
// dialOptions configure a Dial call. dialOptions are set by the DialOption
// values passed to Dial.
type dialOptions struct {
unaryInt UnaryClientInterceptor
streamInt StreamClientInterceptor
codec Codec
cp Compressor
dc Decompressor
bs backoffStrategy
balancer Balancer
block bool
insecure bool
timeout time.Duration
copts transport.ConnectOptions
}
// DialOption configures how we set up the connection.
type DialOption func(*dialOptions)
// WithCodec returns a DialOption which sets a codec for message marshaling and unmarshaling.
func WithCodec(c Codec) DialOption {
return func(o *dialOptions) {
o.codec = c
}
}
// WithCompressor returns a DialOption which sets a CompressorGenerator for generating message
// compressor.
func WithCompressor(cp Compressor) DialOption {
return func(o *dialOptions) {
o.cp = cp
}
}
// WithDecompressor returns a DialOption which sets a DecompressorGenerator for generating
// message decompressor.
func WithDecompressor(dc Decompressor) DialOption {
return func(o *dialOptions) {
o.dc = dc
}
}
// WithBalancer returns a DialOption which sets a load balancer.
func WithBalancer(b Balancer) DialOption {
return func(o *dialOptions) {
o.balancer = b
}
}
// WithBackoffMaxDelay configures the dialer to use the provided maximum delay
// when backing off after failed connection attempts.
func WithBackoffMaxDelay(md time.Duration) DialOption {
return WithBackoffConfig(BackoffConfig{MaxDelay: md})
}
// WithBackoffConfig configures the dialer to use the provided backoff
// parameters after connection failures.
//
// Use WithBackoffMaxDelay until more parameters on BackoffConfig are opened up
// for use.
func WithBackoffConfig(b BackoffConfig) DialOption {
// Set defaults to ensure that provided BackoffConfig is valid and
// unexported fields get default values.
setDefaults(&b)
return withBackoff(b)
}
// withBackoff sets the backoff strategy used for retries after a
// failed connection attempt.
//
// This can be exported if arbitrary backoff strategies are allowed by gRPC.
func withBackoff(bs backoffStrategy) DialOption {
return func(o *dialOptions) {
o.bs = bs
}
}
// WithBlock returns a DialOption which makes caller of Dial blocks until the underlying
// connection is up. Without this, Dial returns immediately and connecting the server
// happens in background.
func WithBlock() DialOption {
return func(o *dialOptions) {
o.block = true
}
}
// WithInsecure returns a DialOption which disables transport security for this ClientConn.
// Note that transport security is required unless WithInsecure is set.
func WithInsecure() DialOption {
return func(o *dialOptions) {
o.insecure = true
}
}
// WithTransportCredentials returns a DialOption which configures a
// connection level security credentials (e.g., TLS/SSL).
func WithTransportCredentials(creds credentials.TransportCredentials) DialOption {
return func(o *dialOptions) {
o.copts.TransportCredentials = creds
}
}
// WithPerRPCCredentials returns a DialOption which sets
// credentials which will place auth state on each outbound RPC.
func WithPerRPCCredentials(creds credentials.PerRPCCredentials) DialOption {
return func(o *dialOptions) {
o.copts.PerRPCCredentials = append(o.copts.PerRPCCredentials, creds)
}
}
// WithTimeout returns a DialOption that configures a timeout for dialing a ClientConn
// initially. This is valid if and only if WithBlock() is present.
func WithTimeout(d time.Duration) DialOption {
return func(o *dialOptions) {
o.timeout = d
}
}
// WithDialer returns a DialOption that specifies a function to use for dialing network addresses.
// If FailOnNonTempDialError() is set to true, and an error is returned by f, gRPC checks the error's
// Temporary() method to decide if it should try to reconnect to the network address.
func WithDialer(f func(string, time.Duration) (net.Conn, error)) DialOption {
return func(o *dialOptions) {
o.copts.Dialer = func(ctx context.Context, addr string) (net.Conn, error) {
if deadline, ok := ctx.Deadline(); ok {
return f(addr, deadline.Sub(time.Now()))
}
return f(addr, 0)
}
}
}
// FailOnNonTempDialError returns a DialOption that specified if gRPC fails on non-temporary dial errors.
// If f is true, and dialer returns a non-temporary error, gRPC will fail the connection to the network
// address and won't try to reconnect.
// The default value of FailOnNonTempDialError is false.
// This is an EXPERIMENTAL API.
func FailOnNonTempDialError(f bool) DialOption {
return func(o *dialOptions) {
o.copts.FailOnNonTempDialError = f
}
}
// WithUserAgent returns a DialOption that specifies a user agent string for all the RPCs.
func WithUserAgent(s string) DialOption {
return func(o *dialOptions) {
o.copts.UserAgent = s
}
}
// WithUnaryInterceptor returns a DialOption that specifies the interceptor for unary RPCs.
func WithUnaryInterceptor(f UnaryClientInterceptor) DialOption {
return func(o *dialOptions) {
o.unaryInt = f
}
}
// WithStreamInterceptor returns a DialOption that specifies the interceptor for streaming RPCs.
func WithStreamInterceptor(f StreamClientInterceptor) DialOption {
return func(o *dialOptions) {
o.streamInt = f
}
}
// Dial creates a client connection to the given target.
func Dial(target string, opts ...DialOption) (*ClientConn, error) {
return DialContext(context.Background(), target, opts...)
}
// DialContext creates a client connection to the given target. ctx can be used to
// cancel or expire the pending connecting. Once this function returns, the
// cancellation and expiration of ctx will be noop. Users should call ClientConn.Close
// to terminate all the pending operations after this function returns.
// This is the EXPERIMENTAL API.
func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
cc := &ClientConn{
target: target,
conns: make(map[Address]*addrConn),
}
cc.ctx, cc.cancel = context.WithCancel(context.Background())
defer func() {
select {
case <-ctx.Done():
conn, err = nil, ctx.Err()
default:
}
if err != nil {
cc.Close()
}
}()
for _, opt := range opts {
opt(&cc.dopts)
}
// Set defaults.
if cc.dopts.codec == nil {
cc.dopts.codec = protoCodec{}
}
if cc.dopts.bs == nil {
cc.dopts.bs = DefaultBackoffConfig
}
creds := cc.dopts.copts.TransportCredentials
if creds != nil && creds.Info().ServerName != "" {
cc.authority = creds.Info().ServerName
} else {
colonPos := strings.LastIndex(target, ":")
if colonPos == -1 {
colonPos = len(target)
}
cc.authority = target[:colonPos]
}
var ok bool
waitC := make(chan error, 1)
go func() {
var addrs []Address
if cc.dopts.balancer == nil {
// Connect to target directly if balancer is nil.
addrs = append(addrs, Address{Addr: target})
} else {
var credsClone credentials.TransportCredentials
if creds != nil {
credsClone = creds.Clone()
}
config := BalancerConfig{
DialCreds: credsClone,
}
if err := cc.dopts.balancer.Start(target, config); err != nil {
waitC <- err
return
}
ch := cc.dopts.balancer.Notify()
if ch == nil {
// There is no name resolver installed.
addrs = append(addrs, Address{Addr: target})
} else {
addrs, ok = <-ch
if !ok || len(addrs) == 0 {
waitC <- errNoAddr
return
}
}
}
for _, a := range addrs {
if err := cc.resetAddrConn(a, false, nil); err != nil {
waitC <- err
return
}
}
close(waitC)
}()
var timeoutCh <-chan time.Time
if cc.dopts.timeout > 0 {
timeoutCh = time.After(cc.dopts.timeout)
}
select {
case <-ctx.Done():
return nil, ctx.Err()
case err := <-waitC:
if err != nil {
return nil, err
}
case <-timeoutCh:
return nil, ErrClientConnTimeout
}
// If balancer is nil or balancer.Notify() is nil, ok will be false here.
// The lbWatcher goroutine will not be created.
if ok {
go cc.lbWatcher()
}
return cc, nil
}
// ConnectivityState indicates the state of a client connection.
type ConnectivityState int
const (
// Idle indicates the ClientConn is idle.
Idle ConnectivityState = iota
// Connecting indicates the ClienConn is connecting.
Connecting
// Ready indicates the ClientConn is ready for work.
Ready
// TransientFailure indicates the ClientConn has seen a failure but expects to recover.
TransientFailure
// Shutdown indicates the ClientConn has started shutting down.
Shutdown
)
func (s ConnectivityState) String() string {
switch s {
case Idle:
return "IDLE"
case Connecting:
return "CONNECTING"
case Ready:
return "READY"
case TransientFailure:
return "TRANSIENT_FAILURE"
case Shutdown:
return "SHUTDOWN"
default:
panic(fmt.Sprintf("unknown connectivity state: %d", s))
}
}
// ClientConn represents a client connection to an RPC server.
type ClientConn struct {
ctx context.Context
cancel context.CancelFunc
target string
authority string
dopts dialOptions
mu sync.RWMutex
conns map[Address]*addrConn
}
func (cc *ClientConn) lbWatcher() {
for addrs := range cc.dopts.balancer.Notify() {
var (
add []Address // Addresses need to setup connections.
del []*addrConn // Connections need to tear down.
)
cc.mu.Lock()
for _, a := range addrs {
if _, ok := cc.conns[a]; !ok {
add = append(add, a)
}
}
for k, c := range cc.conns {
var keep bool
for _, a := range addrs {
if k == a {
keep = true
break
}
}
if !keep {
del = append(del, c)
delete(cc.conns, c.addr)
}
}
cc.mu.Unlock()
for _, a := range add {
cc.resetAddrConn(a, true, nil)
}
for _, c := range del {
c.tearDown(errConnDrain)
}
}
}
// resetAddrConn creates an addrConn for addr and adds it to cc.conns.
// If there is an old addrConn for addr, it will be torn down, using tearDownErr as the reason.
// If tearDownErr is nil, errConnDrain will be used instead.
func (cc *ClientConn) resetAddrConn(addr Address, skipWait bool, tearDownErr error) error {
ac := &addrConn{
cc: cc,
addr: addr,
dopts: cc.dopts,
}
ac.ctx, ac.cancel = context.WithCancel(cc.ctx)
ac.stateCV = sync.NewCond(&ac.mu)
if EnableTracing {
ac.events = trace.NewEventLog("grpc.ClientConn", ac.addr.Addr)
}
if !ac.dopts.insecure {
if ac.dopts.copts.TransportCredentials == nil {
return errNoTransportSecurity
}
} else {
if ac.dopts.copts.TransportCredentials != nil {
return errCredentialsConflict
}
for _, cd := range ac.dopts.copts.PerRPCCredentials {
if cd.RequireTransportSecurity() {
return errTransportCredentialsMissing
}
}
}
// Track ac in cc. This needs to be done before any getTransport(...) is called.
cc.mu.Lock()
if cc.conns == nil {
cc.mu.Unlock()
return ErrClientConnClosing
}
stale := cc.conns[ac.addr]
cc.conns[ac.addr] = ac
cc.mu.Unlock()
if stale != nil {
// There is an addrConn alive on ac.addr already. This could be due to
// 1) a buggy Balancer notifies duplicated Addresses;
// 2) goaway was received, a new ac will replace the old ac.
// The old ac should be deleted from cc.conns, but the
// underlying transport should drain rather than close.
if tearDownErr == nil {
// tearDownErr is nil if resetAddrConn is called by
// 1) Dial
// 2) lbWatcher
// In both cases, the stale ac should drain, not close.
stale.tearDown(errConnDrain)
} else {
stale.tearDown(tearDownErr)
}
}
// skipWait may overwrite the decision in ac.dopts.block.
if ac.dopts.block && !skipWait {
if err := ac.resetTransport(false); err != nil {
if err != errConnClosing {
// Tear down ac and delete it from cc.conns.
cc.mu.Lock()
delete(cc.conns, ac.addr)
cc.mu.Unlock()
ac.tearDown(err)
}
if e, ok := err.(transport.ConnectionError); ok && !e.Temporary() {
return e.Origin()
}
return err
}
// Start to monitor the error status of transport.
go ac.transportMonitor()
} else {
// Start a goroutine connecting to the server asynchronously.
go func() {
if err := ac.resetTransport(false); err != nil {
grpclog.Printf("Failed to dial %s: %v; please retry.", ac.addr.Addr, err)
if err != errConnClosing {
// Keep this ac in cc.conns, to get the reason it's torn down.
ac.tearDown(err)
}
return
}
ac.transportMonitor()
}()
}
return nil
}
func (cc *ClientConn) getTransport(ctx context.Context, opts BalancerGetOptions) (transport.ClientTransport, func(), error) {
var (
ac *addrConn
ok bool
put func()
)
if cc.dopts.balancer == nil {
// If balancer is nil, there should be only one addrConn available.
cc.mu.RLock()
if cc.conns == nil {
cc.mu.RUnlock()
return nil, nil, toRPCErr(ErrClientConnClosing)
}
for _, ac = range cc.conns {
// Break after the first iteration to get the first addrConn.
ok = true
break
}
cc.mu.RUnlock()
} else {
var (
addr Address
err error
)
addr, put, err = cc.dopts.balancer.Get(ctx, opts)
if err != nil {
return nil, nil, toRPCErr(err)
}
cc.mu.RLock()
if cc.conns == nil {
cc.mu.RUnlock()
return nil, nil, toRPCErr(ErrClientConnClosing)
}
ac, ok = cc.conns[addr]
cc.mu.RUnlock()
}
if !ok {
if put != nil {
put()
}
return nil, nil, errConnClosing
}
t, err := ac.wait(ctx, cc.dopts.balancer != nil, !opts.BlockingWait)
if err != nil {
if put != nil {
put()
}
return nil, nil, err
}
return t, put, nil
}
// Close tears down the ClientConn and all underlying connections.
func (cc *ClientConn) Close() error {
cc.cancel()
cc.mu.Lock()
if cc.conns == nil {
cc.mu.Unlock()
return ErrClientConnClosing
}
conns := cc.conns
cc.conns = nil
cc.mu.Unlock()
if cc.dopts.balancer != nil {
cc.dopts.balancer.Close()
}
for _, ac := range conns {
ac.tearDown(ErrClientConnClosing)
}
return nil
}
// addrConn is a network connection to a given address.
type addrConn struct {
ctx context.Context
cancel context.CancelFunc
cc *ClientConn
addr Address
dopts dialOptions
events trace.EventLog
mu sync.Mutex
state ConnectivityState
stateCV *sync.Cond
down func(error) // the handler called when a connection is down.
// ready is closed and becomes nil when a new transport is up or failed
// due to timeout.
ready chan struct{}
transport transport.ClientTransport
// The reason this addrConn is torn down.
tearDownErr error
}
// printf records an event in ac's event log, unless ac has been closed.
// REQUIRES ac.mu is held.
func (ac *addrConn) printf(format string, a ...interface{}) {
if ac.events != nil {
ac.events.Printf(format, a...)
}
}
// errorf records an error in ac's event log, unless ac has been closed.
// REQUIRES ac.mu is held.
func (ac *addrConn) errorf(format string, a ...interface{}) {
if ac.events != nil {
ac.events.Errorf(format, a...)
}
}
// getState returns the connectivity state of the Conn
func (ac *addrConn) getState() ConnectivityState {
ac.mu.Lock()
defer ac.mu.Unlock()
return ac.state
}
// waitForStateChange blocks until the state changes to something other than the sourceState.
func (ac *addrConn) waitForStateChange(ctx context.Context, sourceState ConnectivityState) (ConnectivityState, error) {
ac.mu.Lock()
defer ac.mu.Unlock()
if sourceState != ac.state {
return ac.state, nil
}
done := make(chan struct{})
var err error
go func() {
select {
case <-ctx.Done():
ac.mu.Lock()
err = ctx.Err()
ac.stateCV.Broadcast()
ac.mu.Unlock()
case <-done:
}
}()
defer close(done)
for sourceState == ac.state {
ac.stateCV.Wait()
if err != nil {
return ac.state, err
}
}
return ac.state, nil
}
func (ac *addrConn) resetTransport(closeTransport bool) error {
for retries := 0; ; retries++ {
ac.mu.Lock()
ac.printf("connecting")
if ac.state == Shutdown {
// ac.tearDown(...) has been invoked.
ac.mu.Unlock()
return errConnClosing
}
if ac.down != nil {
ac.down(downErrorf(false, true, "%v", errNetworkIO))
ac.down = nil
}
ac.state = Connecting
ac.stateCV.Broadcast()
t := ac.transport
ac.mu.Unlock()
if closeTransport && t != nil {
t.Close()
}
sleepTime := ac.dopts.bs.backoff(retries)
timeout := minConnectTimeout
if timeout < sleepTime {
timeout = sleepTime
}
ctx, cancel := context.WithTimeout(ac.ctx, timeout)
connectTime := time.Now()
sinfo := transport.TargetInfo{
Addr: ac.addr.Addr,
Metadata: ac.addr.Metadata,
}
newTransport, err := transport.NewClientTransport(ctx, sinfo, ac.dopts.copts)
if err != nil {
cancel()
if e, ok := err.(transport.ConnectionError); ok && !e.Temporary() {
return err
}
grpclog.Printf("grpc: addrConn.resetTransport failed to create client transport: %v; Reconnecting to %v", err, ac.addr)
ac.mu.Lock()
if ac.state == Shutdown {
// ac.tearDown(...) has been invoked.
ac.mu.Unlock()
return errConnClosing
}
ac.errorf("transient failure: %v", err)
ac.state = TransientFailure
ac.stateCV.Broadcast()
if ac.ready != nil {
close(ac.ready)
ac.ready = nil
}
ac.mu.Unlock()
closeTransport = false
select {
case <-time.After(sleepTime - time.Since(connectTime)):
case <-ac.ctx.Done():
return ac.ctx.Err()
}
continue
}
ac.mu.Lock()
ac.printf("ready")
if ac.state == Shutdown {
// ac.tearDown(...) has been invoked.
ac.mu.Unlock()
newTransport.Close()
return errConnClosing
}
ac.state = Ready
ac.stateCV.Broadcast()
ac.transport = newTransport
if ac.ready != nil {
close(ac.ready)
ac.ready = nil
}
if ac.cc.dopts.balancer != nil {
ac.down = ac.cc.dopts.balancer.Up(ac.addr)
}
ac.mu.Unlock()
return nil
}
}
// Run in a goroutine to track the error in transport and create the
// new transport if an error happens. It returns when the channel is closing.
func (ac *addrConn) transportMonitor() {
for {
ac.mu.Lock()
t := ac.transport
ac.mu.Unlock()
select {
// This is needed to detect the teardown when
// the addrConn is idle (i.e., no RPC in flight).
case <-ac.ctx.Done():
select {
case <-t.Error():
t.Close()
default:
}
return
case <-t.GoAway():
// If GoAway happens without any network I/O error, ac is closed without shutting down the
// underlying transport (the transport will be closed when all the pending RPCs finished or
// failed.).
// If GoAway and some network I/O error happen concurrently, ac and its underlying transport
// are closed.
// In both cases, a new ac is created.
select {
case <-t.Error():
ac.cc.resetAddrConn(ac.addr, true, errNetworkIO)
default:
ac.cc.resetAddrConn(ac.addr, true, errConnDrain)
}
return
case <-t.Error():
select {
case <-ac.ctx.Done():
t.Close()
return
case <-t.GoAway():
ac.cc.resetAddrConn(ac.addr, true, errNetworkIO)
return
default:
}
ac.mu.Lock()
if ac.state == Shutdown {
// ac has been shutdown.
ac.mu.Unlock()
return
}
ac.state = TransientFailure
ac.stateCV.Broadcast()
ac.mu.Unlock()
if err := ac.resetTransport(true); err != nil {
ac.mu.Lock()
ac.printf("transport exiting: %v", err)
ac.mu.Unlock()
grpclog.Printf("grpc: addrConn.transportMonitor exits due to: %v", err)
if err != errConnClosing {
// Keep this ac in cc.conns, to get the reason it's torn down.
ac.tearDown(err)
}
return
}
}
}
}
// wait blocks until i) the new transport is up or ii) ctx is done or iii) ac is closed or
// iv) transport is in TransientFailure and there is a balancer/failfast is true.
func (ac *addrConn) wait(ctx context.Context, hasBalancer, failfast bool) (transport.ClientTransport, error) {
for {
ac.mu.Lock()
switch {
case ac.state == Shutdown:
if failfast || !hasBalancer {
// RPC is failfast or balancer is nil. This RPC should fail with ac.tearDownErr.
err := ac.tearDownErr
ac.mu.Unlock()
return nil, err
}
ac.mu.Unlock()
return nil, errConnClosing
case ac.state == Ready:
ct := ac.transport
ac.mu.Unlock()
return ct, nil
case ac.state == TransientFailure:
if failfast || hasBalancer {
ac.mu.Unlock()
return nil, errConnUnavailable
}
}
ready := ac.ready
if ready == nil {
ready = make(chan struct{})
ac.ready = ready
}
ac.mu.Unlock()
select {
case <-ctx.Done():
return nil, toRPCErr(ctx.Err())
// Wait until the new transport is ready or failed.
case <-ready:
}
}
}
// tearDown starts to tear down the addrConn.
// TODO(zhaoq): Make this synchronous to avoid unbounded memory consumption in
// some edge cases (e.g., the caller opens and closes many addrConn's in a
// tight loop.
// tearDown doesn't remove ac from ac.cc.conns.
func (ac *addrConn) tearDown(err error) {
ac.cancel()
ac.mu.Lock()
defer ac.mu.Unlock()
if ac.down != nil {
ac.down(downErrorf(false, false, "%v", err))
ac.down = nil
}
if err == errConnDrain && ac.transport != nil {
// GracefulClose(...) may be executed multiple times when
// i) receiving multiple GoAway frames from the server; or
// ii) there are concurrent name resolver/Balancer triggered
// address removal and GoAway.
ac.transport.GracefulClose()
}
if ac.state == Shutdown {
return
}
ac.state = Shutdown
ac.tearDownErr = err
ac.stateCV.Broadcast()
if ac.events != nil {
ac.events.Finish()
ac.events = nil
}
if ac.ready != nil {
close(ac.ready)
ac.ready = nil
}
if ac.transport != nil && err != errConnDrain {
ac.transport.Close()
}
return
}

16
vendor/google.golang.org/grpc/codes/code_string.go generated vendored Normal file
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// generated by stringer -type=Code; DO NOT EDIT
package codes
import "fmt"
const _Code_name = "OKCanceledUnknownInvalidArgumentDeadlineExceededNotFoundAlreadyExistsPermissionDeniedResourceExhaustedFailedPreconditionAbortedOutOfRangeUnimplementedInternalUnavailableDataLossUnauthenticated"
var _Code_index = [...]uint8{0, 2, 10, 17, 32, 48, 56, 69, 85, 102, 120, 127, 137, 150, 158, 169, 177, 192}
func (i Code) String() string {
if i+1 >= Code(len(_Code_index)) {
return fmt.Sprintf("Code(%d)", i)
}
return _Code_name[_Code_index[i]:_Code_index[i+1]]
}

159
vendor/google.golang.org/grpc/codes/codes.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package codes defines the canonical error codes used by gRPC. It is
// consistent across various languages.
package codes // import "google.golang.org/grpc/codes"
// A Code is an unsigned 32-bit error code as defined in the gRPC spec.
type Code uint32
//go:generate stringer -type=Code
const (
// OK is returned on success.
OK Code = 0
// Canceled indicates the operation was cancelled (typically by the caller).
Canceled Code = 1
// Unknown error. An example of where this error may be returned is
// if a Status value received from another address space belongs to
// an error-space that is not known in this address space. Also
// errors raised by APIs that do not return enough error information
// may be converted to this error.
Unknown Code = 2
// InvalidArgument indicates client specified an invalid argument.
// Note that this differs from FailedPrecondition. It indicates arguments
// that are problematic regardless of the state of the system
// (e.g., a malformed file name).
InvalidArgument Code = 3
// DeadlineExceeded means operation expired before completion.
// For operations that change the state of the system, this error may be
// returned even if the operation has completed successfully. For
// example, a successful response from a server could have been delayed
// long enough for the deadline to expire.
DeadlineExceeded Code = 4
// NotFound means some requested entity (e.g., file or directory) was
// not found.
NotFound Code = 5
// AlreadyExists means an attempt to create an entity failed because one
// already exists.
AlreadyExists Code = 6
// PermissionDenied indicates the caller does not have permission to
// execute the specified operation. It must not be used for rejections
// caused by exhausting some resource (use ResourceExhausted
// instead for those errors). It must not be
// used if the caller cannot be identified (use Unauthenticated
// instead for those errors).
PermissionDenied Code = 7
// Unauthenticated indicates the request does not have valid
// authentication credentials for the operation.
Unauthenticated Code = 16
// ResourceExhausted indicates some resource has been exhausted, perhaps
// a per-user quota, or perhaps the entire file system is out of space.
ResourceExhausted Code = 8
// FailedPrecondition indicates operation was rejected because the
// system is not in a state required for the operation's execution.
// For example, directory to be deleted may be non-empty, an rmdir
// operation is applied to a non-directory, etc.
//
// A litmus test that may help a service implementor in deciding
// between FailedPrecondition, Aborted, and Unavailable:
// (a) Use Unavailable if the client can retry just the failing call.
// (b) Use Aborted if the client should retry at a higher-level
// (e.g., restarting a read-modify-write sequence).
// (c) Use FailedPrecondition if the client should not retry until
// the system state has been explicitly fixed. E.g., if an "rmdir"
// fails because the directory is non-empty, FailedPrecondition
// should be returned since the client should not retry unless
// they have first fixed up the directory by deleting files from it.
// (d) Use FailedPrecondition if the client performs conditional
// REST Get/Update/Delete on a resource and the resource on the
// server does not match the condition. E.g., conflicting
// read-modify-write on the same resource.
FailedPrecondition Code = 9
// Aborted indicates the operation was aborted, typically due to a
// concurrency issue like sequencer check failures, transaction aborts,
// etc.
//
// See litmus test above for deciding between FailedPrecondition,
// Aborted, and Unavailable.
Aborted Code = 10
// OutOfRange means operation was attempted past the valid range.
// E.g., seeking or reading past end of file.
//
// Unlike InvalidArgument, this error indicates a problem that may
// be fixed if the system state changes. For example, a 32-bit file
// system will generate InvalidArgument if asked to read at an
// offset that is not in the range [0,2^32-1], but it will generate
// OutOfRange if asked to read from an offset past the current
// file size.
//
// There is a fair bit of overlap between FailedPrecondition and
// OutOfRange. We recommend using OutOfRange (the more specific
// error) when it applies so that callers who are iterating through
// a space can easily look for an OutOfRange error to detect when
// they are done.
OutOfRange Code = 11
// Unimplemented indicates operation is not implemented or not
// supported/enabled in this service.
Unimplemented Code = 12
// Internal errors. Means some invariants expected by underlying
// system has been broken. If you see one of these errors,
// something is very broken.
Internal Code = 13
// Unavailable indicates the service is currently unavailable.
// This is a most likely a transient condition and may be corrected
// by retrying with a backoff.
//
// See litmus test above for deciding between FailedPrecondition,
// Aborted, and Unavailable.
Unavailable Code = 14
// DataLoss indicates unrecoverable data loss or corruption.
DataLoss Code = 15
)

232
vendor/google.golang.org/grpc/credentials/credentials.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package credentials implements various credentials supported by gRPC library,
// which encapsulate all the state needed by a client to authenticate with a
// server and make various assertions, e.g., about the client's identity, role,
// or whether it is authorized to make a particular call.
package credentials // import "google.golang.org/grpc/credentials"
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"net"
"strings"
"golang.org/x/net/context"
)
var (
// alpnProtoStr are the specified application level protocols for gRPC.
alpnProtoStr = []string{"h2"}
)
// PerRPCCredentials defines the common interface for the credentials which need to
// attach security information to every RPC (e.g., oauth2).
type PerRPCCredentials interface {
// GetRequestMetadata gets the current request metadata, refreshing
// tokens if required. This should be called by the transport layer on
// each request, and the data should be populated in headers or other
// context. uri is the URI of the entry point for the request. When
// supported by the underlying implementation, ctx can be used for
// timeout and cancellation.
// TODO(zhaoq): Define the set of the qualified keys instead of leaving
// it as an arbitrary string.
GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error)
// RequireTransportSecurity indicates whether the credentials requires
// transport security.
RequireTransportSecurity() bool
}
// ProtocolInfo provides information regarding the gRPC wire protocol version,
// security protocol, security protocol version in use, server name, etc.
type ProtocolInfo struct {
// ProtocolVersion is the gRPC wire protocol version.
ProtocolVersion string
// SecurityProtocol is the security protocol in use.
SecurityProtocol string
// SecurityVersion is the security protocol version.
SecurityVersion string
// ServerName is the user-configured server name.
ServerName string
}
// AuthInfo defines the common interface for the auth information the users are interested in.
type AuthInfo interface {
AuthType() string
}
var (
// ErrConnDispatched indicates that rawConn has been dispatched out of gRPC
// and the caller should not close rawConn.
ErrConnDispatched = errors.New("credentials: rawConn is dispatched out of gRPC")
)
// TransportCredentials defines the common interface for all the live gRPC wire
// protocols and supported transport security protocols (e.g., TLS, SSL).
type TransportCredentials interface {
// ClientHandshake does the authentication handshake specified by the corresponding
// authentication protocol on rawConn for clients. It returns the authenticated
// connection and the corresponding auth information about the connection.
// Implementations must use the provided context to implement timely cancellation.
ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
// ServerHandshake does the authentication handshake for servers. It returns
// the authenticated connection and the corresponding auth information about
// the connection.
ServerHandshake(net.Conn) (net.Conn, AuthInfo, error)
// Info provides the ProtocolInfo of this TransportCredentials.
Info() ProtocolInfo
// Clone makes a copy of this TransportCredentials.
Clone() TransportCredentials
// OverrideServerName overrides the server name used to verify the hostname on the returned certificates from the server.
// gRPC internals also use it to override the virtual hosting name if it is set.
// It must be called before dialing. Currently, this is only used by grpclb.
OverrideServerName(string) error
}
// TLSInfo contains the auth information for a TLS authenticated connection.
// It implements the AuthInfo interface.
type TLSInfo struct {
State tls.ConnectionState
}
// AuthType returns the type of TLSInfo as a string.
func (t TLSInfo) AuthType() string {
return "tls"
}
// tlsCreds is the credentials required for authenticating a connection using TLS.
type tlsCreds struct {
// TLS configuration
config *tls.Config
}
func (c tlsCreds) Info() ProtocolInfo {
return ProtocolInfo{
SecurityProtocol: "tls",
SecurityVersion: "1.2",
ServerName: c.config.ServerName,
}
}
func (c *tlsCreds) ClientHandshake(ctx context.Context, addr string, rawConn net.Conn) (_ net.Conn, _ AuthInfo, err error) {
// use local cfg to avoid clobbering ServerName if using multiple endpoints
cfg := cloneTLSConfig(c.config)
if cfg.ServerName == "" {
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
cfg.ServerName = addr[:colonPos]
}
conn := tls.Client(rawConn, cfg)
errChannel := make(chan error, 1)
go func() {
errChannel <- conn.Handshake()
}()
select {
case err := <-errChannel:
if err != nil {
return nil, nil, err
}
case <-ctx.Done():
return nil, nil, ctx.Err()
}
// TODO(zhaoq): Omit the auth info for client now. It is more for
// information than anything else.
return conn, nil, nil
}
func (c *tlsCreds) ServerHandshake(rawConn net.Conn) (net.Conn, AuthInfo, error) {
conn := tls.Server(rawConn, c.config)
if err := conn.Handshake(); err != nil {
return nil, nil, err
}
return conn, TLSInfo{conn.ConnectionState()}, nil
}
func (c *tlsCreds) Clone() TransportCredentials {
return NewTLS(c.config)
}
func (c *tlsCreds) OverrideServerName(serverNameOverride string) error {
c.config.ServerName = serverNameOverride
return nil
}
// NewTLS uses c to construct a TransportCredentials based on TLS.
func NewTLS(c *tls.Config) TransportCredentials {
tc := &tlsCreds{cloneTLSConfig(c)}
tc.config.NextProtos = alpnProtoStr
return tc
}
// NewClientTLSFromCert constructs a TLS from the input certificate for client.
// serverNameOverride is for testing only. If set to a non empty string,
// it will override the virtual host name of authority (e.g. :authority header field) in requests.
func NewClientTLSFromCert(cp *x509.CertPool, serverNameOverride string) TransportCredentials {
return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp})
}
// NewClientTLSFromFile constructs a TLS from the input certificate file for client.
// serverNameOverride is for testing only. If set to a non empty string,
// it will override the virtual host name of authority (e.g. :authority header field) in requests.
func NewClientTLSFromFile(certFile, serverNameOverride string) (TransportCredentials, error) {
b, err := ioutil.ReadFile(certFile)
if err != nil {
return nil, err
}
cp := x509.NewCertPool()
if !cp.AppendCertsFromPEM(b) {
return nil, fmt.Errorf("credentials: failed to append certificates")
}
return NewTLS(&tls.Config{ServerName: serverNameOverride, RootCAs: cp}), nil
}
// NewServerTLSFromCert constructs a TLS from the input certificate for server.
func NewServerTLSFromCert(cert *tls.Certificate) TransportCredentials {
return NewTLS(&tls.Config{Certificates: []tls.Certificate{*cert}})
}
// NewServerTLSFromFile constructs a TLS from the input certificate file and key
// file for server.
func NewServerTLSFromFile(certFile, keyFile string) (TransportCredentials, error) {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, err
}
return NewTLS(&tls.Config{Certificates: []tls.Certificate{cert}}), nil
}

76
vendor/google.golang.org/grpc/credentials/credentials_util_go17.go generated vendored Normal file
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// +build go1.7
/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package credentials
import (
"crypto/tls"
)
// cloneTLSConfig returns a shallow clone of the exported
// fields of cfg, ignoring the unexported sync.Once, which
// contains a mutex and must not be copied.
//
// If cfg is nil, a new zero tls.Config is returned.
//
// TODO replace this function with official clone function.
func cloneTLSConfig(cfg *tls.Config) *tls.Config {
if cfg == nil {
return &tls.Config{}
}
return &tls.Config{
Rand: cfg.Rand,
Time: cfg.Time,
Certificates: cfg.Certificates,
NameToCertificate: cfg.NameToCertificate,
GetCertificate: cfg.GetCertificate,
RootCAs: cfg.RootCAs,
NextProtos: cfg.NextProtos,
ServerName: cfg.ServerName,
ClientAuth: cfg.ClientAuth,
ClientCAs: cfg.ClientCAs,
InsecureSkipVerify: cfg.InsecureSkipVerify,
CipherSuites: cfg.CipherSuites,
PreferServerCipherSuites: cfg.PreferServerCipherSuites,
SessionTicketsDisabled: cfg.SessionTicketsDisabled,
SessionTicketKey: cfg.SessionTicketKey,
ClientSessionCache: cfg.ClientSessionCache,
MinVersion: cfg.MinVersion,
MaxVersion: cfg.MaxVersion,
CurvePreferences: cfg.CurvePreferences,
DynamicRecordSizingDisabled: cfg.DynamicRecordSizingDisabled,
Renegotiation: cfg.Renegotiation,
}
}

74
vendor/google.golang.org/grpc/credentials/credentials_util_pre_go17.go generated vendored Normal file
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// +build !go1.7
/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package credentials
import (
"crypto/tls"
)
// cloneTLSConfig returns a shallow clone of the exported
// fields of cfg, ignoring the unexported sync.Once, which
// contains a mutex and must not be copied.
//
// If cfg is nil, a new zero tls.Config is returned.
//
// TODO replace this function with official clone function.
func cloneTLSConfig(cfg *tls.Config) *tls.Config {
if cfg == nil {
return &tls.Config{}
}
return &tls.Config{
Rand: cfg.Rand,
Time: cfg.Time,
Certificates: cfg.Certificates,
NameToCertificate: cfg.NameToCertificate,
GetCertificate: cfg.GetCertificate,
RootCAs: cfg.RootCAs,
NextProtos: cfg.NextProtos,
ServerName: cfg.ServerName,
ClientAuth: cfg.ClientAuth,
ClientCAs: cfg.ClientCAs,
InsecureSkipVerify: cfg.InsecureSkipVerify,
CipherSuites: cfg.CipherSuites,
PreferServerCipherSuites: cfg.PreferServerCipherSuites,
SessionTicketsDisabled: cfg.SessionTicketsDisabled,
SessionTicketKey: cfg.SessionTicketKey,
ClientSessionCache: cfg.ClientSessionCache,
MinVersion: cfg.MinVersion,
MaxVersion: cfg.MaxVersion,
CurvePreferences: cfg.CurvePreferences,
}
}

6
vendor/google.golang.org/grpc/doc.go generated vendored Normal file
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/*
Package grpc implements an RPC system called gRPC.
See www.grpc.io for more information about gRPC.
*/
package grpc // import "google.golang.org/grpc"

93
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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
Package grpclog defines logging for grpc.
*/
package grpclog // import "google.golang.org/grpc/grpclog"
import (
"log"
"os"
)
// Use golang's standard logger by default.
// Access is not mutex-protected: do not modify except in init()
// functions.
var logger Logger = log.New(os.Stderr, "", log.LstdFlags)
// Logger mimics golang's standard Logger as an interface.
type Logger interface {
Fatal(args ...interface{})
Fatalf(format string, args ...interface{})
Fatalln(args ...interface{})
Print(args ...interface{})
Printf(format string, args ...interface{})
Println(args ...interface{})
}
// SetLogger sets the logger that is used in grpc. Call only from
// init() functions.
func SetLogger(l Logger) {
logger = l
}
// Fatal is equivalent to Print() followed by a call to os.Exit() with a non-zero exit code.
func Fatal(args ...interface{}) {
logger.Fatal(args...)
}
// Fatalf is equivalent to Printf() followed by a call to os.Exit() with a non-zero exit code.
func Fatalf(format string, args ...interface{}) {
logger.Fatalf(format, args...)
}
// Fatalln is equivalent to Println() followed by a call to os.Exit()) with a non-zero exit code.
func Fatalln(args ...interface{}) {
logger.Fatalln(args...)
}
// Print prints to the logger. Arguments are handled in the manner of fmt.Print.
func Print(args ...interface{}) {
logger.Print(args...)
}
// Printf prints to the logger. Arguments are handled in the manner of fmt.Printf.
func Printf(format string, args ...interface{}) {
logger.Printf(format, args...)
}
// Println prints to the logger. Arguments are handled in the manner of fmt.Println.
func Println(args ...interface{}) {
logger.Println(args...)
}

90
vendor/google.golang.org/grpc/interceptor.go generated vendored Normal file
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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"golang.org/x/net/context"
)
// UnaryInvoker is called by UnaryClientInterceptor to complete RPCs.
type UnaryInvoker func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, opts ...CallOption) error
// UnaryClientInterceptor intercepts the execution of a unary RPC on the client. inovker is the handler to complete the RPC
// and it is the responsibility of the interceptor to call it.
// This is the EXPERIMENTAL API.
type UnaryClientInterceptor func(ctx context.Context, method string, req, reply interface{}, cc *ClientConn, invoker UnaryInvoker, opts ...CallOption) error
// Streamer is called by StreamClientInterceptor to create a ClientStream.
type Streamer func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (ClientStream, error)
// StreamClientInterceptor intercepts the creation of ClientStream. It may return a custom ClientStream to intercept all I/O
// operations. streamer is the handlder to create a ClientStream and it is the responsibility of the interceptor to call it.
// This is the EXPERIMENTAL API.
type StreamClientInterceptor func(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, streamer Streamer, opts ...CallOption) (ClientStream, error)
// UnaryServerInfo consists of various information about a unary RPC on
// server side. All per-rpc information may be mutated by the interceptor.
type UnaryServerInfo struct {
// Server is the service implementation the user provides. This is read-only.
Server interface{}
// FullMethod is the full RPC method string, i.e., /package.service/method.
FullMethod string
}
// UnaryHandler defines the handler invoked by UnaryServerInterceptor to complete the normal
// execution of a unary RPC.
type UnaryHandler func(ctx context.Context, req interface{}) (interface{}, error)
// UnaryServerInterceptor provides a hook to intercept the execution of a unary RPC on the server. info
// contains all the information of this RPC the interceptor can operate on. And handler is the wrapper
// of the service method implementation. It is the responsibility of the interceptor to invoke handler
// to complete the RPC.
type UnaryServerInterceptor func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (resp interface{}, err error)
// StreamServerInfo consists of various information about a streaming RPC on
// server side. All per-rpc information may be mutated by the interceptor.
type StreamServerInfo struct {
// FullMethod is the full RPC method string, i.e., /package.service/method.
FullMethod string
// IsClientStream indicates whether the RPC is a client streaming RPC.
IsClientStream bool
// IsServerStream indicates whether the RPC is a server streaming RPC.
IsServerStream bool
}
// StreamServerInterceptor provides a hook to intercept the execution of a streaming RPC on the server.
// info contains all the information of this RPC the interceptor can operate on. And handler is the
// service method implementation. It is the responsibility of the interceptor to invoke handler to
// complete the RPC.
type StreamServerInterceptor func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error

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vendor/google.golang.org/grpc/internal/internal.go generated vendored Normal file
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/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package internal contains gRPC-internal code for testing, to avoid polluting
// the godoc of the top-level grpc package.
package internal
// TestingCloseConns closes all existing transports but keeps
// grpcServer.lis accepting new connections.
//
// The provided grpcServer must be of type *grpc.Server. It is untyped
// for circular dependency reasons.
var TestingCloseConns func(grpcServer interface{})
// TestingUseHandlerImpl enables the http.Handler-based server implementation.
// It must be called before Serve and requires TLS credentials.
//
// The provided grpcServer must be of type *grpc.Server. It is untyped
// for circular dependency reasons.
var TestingUseHandlerImpl func(grpcServer interface{})

149
vendor/google.golang.org/grpc/metadata/metadata.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package metadata define the structure of the metadata supported by gRPC library.
package metadata // import "google.golang.org/grpc/metadata"
import (
"encoding/base64"
"fmt"
"strings"
"golang.org/x/net/context"
)
const (
binHdrSuffix = "-bin"
)
// encodeKeyValue encodes key and value qualified for transmission via gRPC.
// Transmitting binary headers violates HTTP/2 spec.
// TODO(zhaoq): Maybe check if k is ASCII also.
func encodeKeyValue(k, v string) (string, string) {
k = strings.ToLower(k)
if strings.HasSuffix(k, binHdrSuffix) {
val := base64.StdEncoding.EncodeToString([]byte(v))
v = string(val)
}
return k, v
}
// DecodeKeyValue returns the original key and value corresponding to the
// encoded data in k, v.
// If k is a binary header and v contains comma, v is split on comma before decoded,
// and the decoded v will be joined with comma before returned.
func DecodeKeyValue(k, v string) (string, string, error) {
if !strings.HasSuffix(k, binHdrSuffix) {
return k, v, nil
}
vvs := strings.Split(v, ",")
for i, vv := range vvs {
val, err := base64.StdEncoding.DecodeString(vv)
if err != nil {
return "", "", err
}
vvs[i] = string(val)
}
return k, strings.Join(vvs, ","), nil
}
// MD is a mapping from metadata keys to values. Users should use the following
// two convenience functions New and Pairs to generate MD.
type MD map[string][]string
// New creates a MD from given key-value map.
func New(m map[string]string) MD {
md := MD{}
for k, v := range m {
key, val := encodeKeyValue(k, v)
md[key] = append(md[key], val)
}
return md
}
// Pairs returns an MD formed by the mapping of key, value ...
// Pairs panics if len(kv) is odd.
func Pairs(kv ...string) MD {
if len(kv)%2 == 1 {
panic(fmt.Sprintf("metadata: Pairs got the odd number of input pairs for metadata: %d", len(kv)))
}
md := MD{}
var k string
for i, s := range kv {
if i%2 == 0 {
k = s
continue
}
key, val := encodeKeyValue(k, s)
md[key] = append(md[key], val)
}
return md
}
// Len returns the number of items in md.
func (md MD) Len() int {
return len(md)
}
// Copy returns a copy of md.
func (md MD) Copy() MD {
return Join(md)
}
// Join joins any number of MDs into a single MD.
// The order of values for each key is determined by the order in which
// the MDs containing those values are presented to Join.
func Join(mds ...MD) MD {
out := MD{}
for _, md := range mds {
for k, v := range md {
out[k] = append(out[k], v...)
}
}
return out
}
type mdKey struct{}
// NewContext creates a new context with md attached.
func NewContext(ctx context.Context, md MD) context.Context {
return context.WithValue(ctx, mdKey{}, md)
}
// FromContext returns the MD in ctx if it exists.
// The returned md should be immutable, writing to it may cause races.
// Modification should be made to the copies of the returned md.
func FromContext(ctx context.Context) (md MD, ok bool) {
md, ok = ctx.Value(mdKey{}).(MD)
return
}

74
vendor/google.golang.org/grpc/naming/naming.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package naming defines the naming API and related data structures for gRPC.
// The interface is EXPERIMENTAL and may be suject to change.
package naming
// Operation defines the corresponding operations for a name resolution change.
type Operation uint8
const (
// Add indicates a new address is added.
Add Operation = iota
// Delete indicates an exisiting address is deleted.
Delete
)
// Update defines a name resolution update. Notice that it is not valid having both
// empty string Addr and nil Metadata in an Update.
type Update struct {
// Op indicates the operation of the update.
Op Operation
// Addr is the updated address. It is empty string if there is no address update.
Addr string
// Metadata is the updated metadata. It is nil if there is no metadata update.
// Metadata is not required for a custom naming implementation.
Metadata interface{}
}
// Resolver creates a Watcher for a target to track its resolution changes.
type Resolver interface {
// Resolve creates a Watcher for target.
Resolve(target string) (Watcher, error)
}
// Watcher watches for the updates on the specified target.
type Watcher interface {
// Next blocks until an update or error happens. It may return one or more
// updates. The first call should get the full set of the results. It should
// return an error if and only if Watcher cannot recover.
Next() ([]*Update, error)
// Close closes the Watcher.
Close()
}

65
vendor/google.golang.org/grpc/peer/peer.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package peer defines various peer information associated with RPCs and
// corresponding utils.
package peer
import (
"net"
"golang.org/x/net/context"
"google.golang.org/grpc/credentials"
)
// Peer contains the information of the peer for an RPC.
type Peer struct {
// Addr is the peer address.
Addr net.Addr
// AuthInfo is the authentication information of the transport.
// It is nil if there is no transport security being used.
AuthInfo credentials.AuthInfo
}
type peerKey struct{}
// NewContext creates a new context with peer information attached.
func NewContext(ctx context.Context, p *Peer) context.Context {
return context.WithValue(ctx, peerKey{}, p)
}
// FromContext returns the peer information in ctx if it exists.
func FromContext(ctx context.Context) (p *Peer, ok bool) {
p, ok = ctx.Value(peerKey{}).(*Peer)
return
}

481
vendor/google.golang.org/grpc/rpc_util.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"bytes"
"compress/gzip"
"encoding/binary"
"fmt"
"io"
"io/ioutil"
"math"
"os"
"time"
"github.com/golang/protobuf/proto"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/transport"
)
// Codec defines the interface gRPC uses to encode and decode messages.
type Codec interface {
// Marshal returns the wire format of v.
Marshal(v interface{}) ([]byte, error)
// Unmarshal parses the wire format into v.
Unmarshal(data []byte, v interface{}) error
// String returns the name of the Codec implementation. The returned
// string will be used as part of content type in transmission.
String() string
}
// protoCodec is a Codec implementation with protobuf. It is the default codec for gRPC.
type protoCodec struct{}
func (protoCodec) Marshal(v interface{}) ([]byte, error) {
return proto.Marshal(v.(proto.Message))
}
func (protoCodec) Unmarshal(data []byte, v interface{}) error {
return proto.Unmarshal(data, v.(proto.Message))
}
func (protoCodec) String() string {
return "proto"
}
// Compressor defines the interface gRPC uses to compress a message.
type Compressor interface {
// Do compresses p into w.
Do(w io.Writer, p []byte) error
// Type returns the compression algorithm the Compressor uses.
Type() string
}
// NewGZIPCompressor creates a Compressor based on GZIP.
func NewGZIPCompressor() Compressor {
return &gzipCompressor{}
}
type gzipCompressor struct {
}
func (c *gzipCompressor) Do(w io.Writer, p []byte) error {
z := gzip.NewWriter(w)
if _, err := z.Write(p); err != nil {
return err
}
return z.Close()
}
func (c *gzipCompressor) Type() string {
return "gzip"
}
// Decompressor defines the interface gRPC uses to decompress a message.
type Decompressor interface {
// Do reads the data from r and uncompress them.
Do(r io.Reader) ([]byte, error)
// Type returns the compression algorithm the Decompressor uses.
Type() string
}
type gzipDecompressor struct {
}
// NewGZIPDecompressor creates a Decompressor based on GZIP.
func NewGZIPDecompressor() Decompressor {
return &gzipDecompressor{}
}
func (d *gzipDecompressor) Do(r io.Reader) ([]byte, error) {
z, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
defer z.Close()
return ioutil.ReadAll(z)
}
func (d *gzipDecompressor) Type() string {
return "gzip"
}
// callInfo contains all related configuration and information about an RPC.
type callInfo struct {
failFast bool
headerMD metadata.MD
trailerMD metadata.MD
traceInfo traceInfo // in trace.go
}
var defaultCallInfo = callInfo{failFast: true}
// CallOption configures a Call before it starts or extracts information from
// a Call after it completes.
type CallOption interface {
// before is called before the call is sent to any server. If before
// returns a non-nil error, the RPC fails with that error.
before(*callInfo) error
// after is called after the call has completed. after cannot return an
// error, so any failures should be reported via output parameters.
after(*callInfo)
}
type beforeCall func(c *callInfo) error
func (o beforeCall) before(c *callInfo) error { return o(c) }
func (o beforeCall) after(c *callInfo) {}
type afterCall func(c *callInfo)
func (o afterCall) before(c *callInfo) error { return nil }
func (o afterCall) after(c *callInfo) { o(c) }
// Header returns a CallOptions that retrieves the header metadata
// for a unary RPC.
func Header(md *metadata.MD) CallOption {
return afterCall(func(c *callInfo) {
*md = c.headerMD
})
}
// Trailer returns a CallOptions that retrieves the trailer metadata
// for a unary RPC.
func Trailer(md *metadata.MD) CallOption {
return afterCall(func(c *callInfo) {
*md = c.trailerMD
})
}
// FailFast configures the action to take when an RPC is attempted on broken
// connections or unreachable servers. If failfast is true, the RPC will fail
// immediately. Otherwise, the RPC client will block the call until a
// connection is available (or the call is canceled or times out) and will retry
// the call if it fails due to a transient error. Please refer to
// https://github.com/grpc/grpc/blob/master/doc/fail_fast.md
func FailFast(failFast bool) CallOption {
return beforeCall(func(c *callInfo) error {
c.failFast = failFast
return nil
})
}
// The format of the payload: compressed or not?
type payloadFormat uint8
const (
compressionNone payloadFormat = iota // no compression
compressionMade
)
// parser reads complete gRPC messages from the underlying reader.
type parser struct {
// r is the underlying reader.
// See the comment on recvMsg for the permissible
// error types.
r io.Reader
// The header of a gRPC message. Find more detail
// at http://www.grpc.io/docs/guides/wire.html.
header [5]byte
}
// recvMsg reads a complete gRPC message from the stream.
//
// It returns the message and its payload (compression/encoding)
// format. The caller owns the returned msg memory.
//
// If there is an error, possible values are:
// * io.EOF, when no messages remain
// * io.ErrUnexpectedEOF
// * of type transport.ConnectionError
// * of type transport.StreamError
// No other error values or types must be returned, which also means
// that the underlying io.Reader must not return an incompatible
// error.
func (p *parser) recvMsg(maxMsgSize int) (pf payloadFormat, msg []byte, err error) {
if _, err := io.ReadFull(p.r, p.header[:]); err != nil {
return 0, nil, err
}
pf = payloadFormat(p.header[0])
length := binary.BigEndian.Uint32(p.header[1:])
if length == 0 {
return pf, nil, nil
}
if length > uint32(maxMsgSize) {
return 0, nil, Errorf(codes.Internal, "grpc: received message length %d exceeding the max size %d", length, maxMsgSize)
}
// TODO(bradfitz,zhaoq): garbage. reuse buffer after proto decoding instead
// of making it for each message:
msg = make([]byte, int(length))
if _, err := io.ReadFull(p.r, msg); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return 0, nil, err
}
return pf, msg, nil
}
// encode serializes msg and prepends the message header. If msg is nil, it
// generates the message header of 0 message length.
func encode(c Codec, msg interface{}, cp Compressor, cbuf *bytes.Buffer, outPayload *stats.OutPayload) ([]byte, error) {
var (
b []byte
length uint
)
if msg != nil {
var err error
// TODO(zhaoq): optimize to reduce memory alloc and copying.
b, err = c.Marshal(msg)
if err != nil {
return nil, err
}
if outPayload != nil {
outPayload.Payload = msg
// TODO truncate large payload.
outPayload.Data = b
outPayload.Length = len(b)
}
if cp != nil {
if err := cp.Do(cbuf, b); err != nil {
return nil, err
}
b = cbuf.Bytes()
}
length = uint(len(b))
}
if length > math.MaxUint32 {
return nil, Errorf(codes.InvalidArgument, "grpc: message too large (%d bytes)", length)
}
const (
payloadLen = 1
sizeLen = 4
)
var buf = make([]byte, payloadLen+sizeLen+len(b))
// Write payload format
if cp == nil {
buf[0] = byte(compressionNone)
} else {
buf[0] = byte(compressionMade)
}
// Write length of b into buf
binary.BigEndian.PutUint32(buf[1:], uint32(length))
// Copy encoded msg to buf
copy(buf[5:], b)
if outPayload != nil {
outPayload.WireLength = len(buf)
}
return buf, nil
}
func checkRecvPayload(pf payloadFormat, recvCompress string, dc Decompressor) error {
switch pf {
case compressionNone:
case compressionMade:
if dc == nil || recvCompress != dc.Type() {
return Errorf(codes.Unimplemented, "grpc: Decompressor is not installed for grpc-encoding %q", recvCompress)
}
default:
return Errorf(codes.Internal, "grpc: received unexpected payload format %d", pf)
}
return nil
}
func recv(p *parser, c Codec, s *transport.Stream, dc Decompressor, m interface{}, maxMsgSize int, inPayload *stats.InPayload) error {
pf, d, err := p.recvMsg(maxMsgSize)
if err != nil {
return err
}
if inPayload != nil {
inPayload.WireLength = len(d)
}
if err := checkRecvPayload(pf, s.RecvCompress(), dc); err != nil {
return err
}
if pf == compressionMade {
d, err = dc.Do(bytes.NewReader(d))
if err != nil {
return Errorf(codes.Internal, "grpc: failed to decompress the received message %v", err)
}
}
if len(d) > maxMsgSize {
// TODO: Revisit the error code. Currently keep it consistent with java
// implementation.
return Errorf(codes.Internal, "grpc: received a message of %d bytes exceeding %d limit", len(d), maxMsgSize)
}
if err := c.Unmarshal(d, m); err != nil {
return Errorf(codes.Internal, "grpc: failed to unmarshal the received message %v", err)
}
if inPayload != nil {
inPayload.RecvTime = time.Now()
inPayload.Payload = m
// TODO truncate large payload.
inPayload.Data = d
inPayload.Length = len(d)
}
return nil
}
// rpcError defines the status from an RPC.
type rpcError struct {
code codes.Code
desc string
}
func (e *rpcError) Error() string {
return fmt.Sprintf("rpc error: code = %d desc = %s", e.code, e.desc)
}
// Code returns the error code for err if it was produced by the rpc system.
// Otherwise, it returns codes.Unknown.
func Code(err error) codes.Code {
if err == nil {
return codes.OK
}
if e, ok := err.(*rpcError); ok {
return e.code
}
return codes.Unknown
}
// ErrorDesc returns the error description of err if it was produced by the rpc system.
// Otherwise, it returns err.Error() or empty string when err is nil.
func ErrorDesc(err error) string {
if err == nil {
return ""
}
if e, ok := err.(*rpcError); ok {
return e.desc
}
return err.Error()
}
// Errorf returns an error containing an error code and a description;
// Errorf returns nil if c is OK.
func Errorf(c codes.Code, format string, a ...interface{}) error {
if c == codes.OK {
return nil
}
return &rpcError{
code: c,
desc: fmt.Sprintf(format, a...),
}
}
// toRPCErr converts an error into a rpcError.
func toRPCErr(err error) error {
switch e := err.(type) {
case *rpcError:
return err
case transport.StreamError:
return &rpcError{
code: e.Code,
desc: e.Desc,
}
case transport.ConnectionError:
return &rpcError{
code: codes.Internal,
desc: e.Desc,
}
default:
switch err {
case context.DeadlineExceeded:
return &rpcError{
code: codes.DeadlineExceeded,
desc: err.Error(),
}
case context.Canceled:
return &rpcError{
code: codes.Canceled,
desc: err.Error(),
}
case ErrClientConnClosing:
return &rpcError{
code: codes.FailedPrecondition,
desc: err.Error(),
}
}
}
return Errorf(codes.Unknown, "%v", err)
}
// convertCode converts a standard Go error into its canonical code. Note that
// this is only used to translate the error returned by the server applications.
func convertCode(err error) codes.Code {
switch err {
case nil:
return codes.OK
case io.EOF:
return codes.OutOfRange
case io.ErrClosedPipe, io.ErrNoProgress, io.ErrShortBuffer, io.ErrShortWrite, io.ErrUnexpectedEOF:
return codes.FailedPrecondition
case os.ErrInvalid:
return codes.InvalidArgument
case context.Canceled:
return codes.Canceled
case context.DeadlineExceeded:
return codes.DeadlineExceeded
}
switch {
case os.IsExist(err):
return codes.AlreadyExists
case os.IsNotExist(err):
return codes.NotFound
case os.IsPermission(err):
return codes.PermissionDenied
}
return codes.Unknown
}
// SupportPackageIsVersion4 is referenced from generated protocol buffer files
// to assert that that code is compatible with this version of the grpc package.
//
// This constant may be renamed in the future if a change in the generated code
// requires a synchronised update of grpc-go and protoc-gen-go. This constant
// should not be referenced from any other code.
const SupportPackageIsVersion4 = true

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vendor/google.golang.org/grpc/stats/handlers.go generated vendored Normal file
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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package stats
import (
"net"
"sync/atomic"
"golang.org/x/net/context"
"google.golang.org/grpc/grpclog"
)
// ConnTagInfo defines the relevant information needed by connection context tagger.
type ConnTagInfo struct {
// RemoteAddr is the remote address of the corresponding connection.
RemoteAddr net.Addr
// LocalAddr is the local address of the corresponding connection.
LocalAddr net.Addr
// TODO add QOS related fields.
}
// RPCTagInfo defines the relevant information needed by RPC context tagger.
type RPCTagInfo struct {
// FullMethodName is the RPC method in the format of /package.service/method.
FullMethodName string
}
var (
on = new(int32)
rpcHandler func(context.Context, RPCStats)
connHandler func(context.Context, ConnStats)
connTagger func(context.Context, *ConnTagInfo) context.Context
rpcTagger func(context.Context, *RPCTagInfo) context.Context
)
// HandleRPC processes the RPC stats using the rpc handler registered by the user.
func HandleRPC(ctx context.Context, s RPCStats) {
if rpcHandler == nil {
return
}
rpcHandler(ctx, s)
}
// RegisterRPCHandler registers the user handler function for RPC stats processing.
// It should be called only once. The later call will overwrite the former value if it is called multiple times.
// This handler function will be called to process the rpc stats.
func RegisterRPCHandler(f func(context.Context, RPCStats)) {
rpcHandler = f
}
// HandleConn processes the stats using the call back function registered by user.
func HandleConn(ctx context.Context, s ConnStats) {
if connHandler == nil {
return
}
connHandler(ctx, s)
}
// RegisterConnHandler registers the user handler function for conn stats.
// It should be called only once. The later call will overwrite the former value if it is called multiple times.
// This handler function will be called to process the conn stats.
func RegisterConnHandler(f func(context.Context, ConnStats)) {
connHandler = f
}
// TagConn calls user registered connection context tagger.
func TagConn(ctx context.Context, info *ConnTagInfo) context.Context {
if connTagger == nil {
return ctx
}
return connTagger(ctx, info)
}
// RegisterConnTagger registers the user connection context tagger function.
// The connection context tagger can attach some information to the given context.
// The returned context will be used for stats handling.
// For conn stats handling, the context used in connHandler for this
// connection will be derived from the context returned.
// For RPC stats handling,
// - On server side, the context used in rpcHandler for all RPCs on this
// connection will be derived from the context returned.
// - On client side, the context is not derived from the context returned.
func RegisterConnTagger(t func(context.Context, *ConnTagInfo) context.Context) {
connTagger = t
}
// TagRPC calls the user registered RPC context tagger.
func TagRPC(ctx context.Context, info *RPCTagInfo) context.Context {
if rpcTagger == nil {
return ctx
}
return rpcTagger(ctx, info)
}
// RegisterRPCTagger registers the user RPC context tagger function.
// The RPC context tagger can attach some information to the given context.
// The context used in stats rpcHandler for this RPC will be derived from the
// context returned.
func RegisterRPCTagger(t func(context.Context, *RPCTagInfo) context.Context) {
rpcTagger = t
}
// Start starts the stats collection and processing if there is a registered stats handle.
func Start() {
if rpcHandler == nil && connHandler == nil {
grpclog.Println("rpcHandler and connHandler are both nil when starting stats. Stats is not started")
return
}
atomic.StoreInt32(on, 1)
}
// Stop stops the stats collection and processing.
// Stop does not unregister the handlers.
func Stop() {
atomic.StoreInt32(on, 0)
}
// On indicates whether the stats collection and processing is on.
func On() bool {
return atomic.CompareAndSwapInt32(on, 1, 1)
}

223
vendor/google.golang.org/grpc/stats/stats.go generated vendored Normal file
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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package stats is for collecting and reporting various network and RPC stats.
// This package is for monitoring purpose only. All fields are read-only.
// All APIs are experimental.
package stats // import "google.golang.org/grpc/stats"
import (
"net"
"time"
)
// RPCStats contains stats information about RPCs.
type RPCStats interface {
isRPCStats()
// IsClient returns true if this RPCStats is from client side.
IsClient() bool
}
// Begin contains stats when an RPC begins.
// FailFast are only valid if Client is true.
type Begin struct {
// Client is true if this Begin is from client side.
Client bool
// BeginTime is the time when the RPC begins.
BeginTime time.Time
// FailFast indicates if this RPC is failfast.
FailFast bool
}
// IsClient indicates if this is from client side.
func (s *Begin) IsClient() bool { return s.Client }
func (s *Begin) isRPCStats() {}
// InPayload contains the information for an incoming payload.
type InPayload struct {
// Client is true if this InPayload is from client side.
Client bool
// Payload is the payload with original type.
Payload interface{}
// Data is the serialized message payload.
Data []byte
// Length is the length of uncompressed data.
Length int
// WireLength is the length of data on wire (compressed, signed, encrypted).
WireLength int
// RecvTime is the time when the payload is received.
RecvTime time.Time
}
// IsClient indicates if this is from client side.
func (s *InPayload) IsClient() bool { return s.Client }
func (s *InPayload) isRPCStats() {}
// InHeader contains stats when a header is received.
// FullMethod, addresses and Compression are only valid if Client is false.
type InHeader struct {
// Client is true if this InHeader is from client side.
Client bool
// WireLength is the wire length of header.
WireLength int
// FullMethod is the full RPC method string, i.e., /package.service/method.
FullMethod string
// RemoteAddr is the remote address of the corresponding connection.
RemoteAddr net.Addr
// LocalAddr is the local address of the corresponding connection.
LocalAddr net.Addr
// Compression is the compression algorithm used for the RPC.
Compression string
}
// IsClient indicates if this is from client side.
func (s *InHeader) IsClient() bool { return s.Client }
func (s *InHeader) isRPCStats() {}
// InTrailer contains stats when a trailer is received.
type InTrailer struct {
// Client is true if this InTrailer is from client side.
Client bool
// WireLength is the wire length of trailer.
WireLength int
}
// IsClient indicates if this is from client side.
func (s *InTrailer) IsClient() bool { return s.Client }
func (s *InTrailer) isRPCStats() {}
// OutPayload contains the information for an outgoing payload.
type OutPayload struct {
// Client is true if this OutPayload is from client side.
Client bool
// Payload is the payload with original type.
Payload interface{}
// Data is the serialized message payload.
Data []byte
// Length is the length of uncompressed data.
Length int
// WireLength is the length of data on wire (compressed, signed, encrypted).
WireLength int
// SentTime is the time when the payload is sent.
SentTime time.Time
}
// IsClient indicates if this is from client side.
func (s *OutPayload) IsClient() bool { return s.Client }
func (s *OutPayload) isRPCStats() {}
// OutHeader contains stats when a header is sent.
// FullMethod, addresses and Compression are only valid if Client is true.
type OutHeader struct {
// Client is true if this OutHeader is from client side.
Client bool
// WireLength is the wire length of header.
WireLength int
// FullMethod is the full RPC method string, i.e., /package.service/method.
FullMethod string
// RemoteAddr is the remote address of the corresponding connection.
RemoteAddr net.Addr
// LocalAddr is the local address of the corresponding connection.
LocalAddr net.Addr
// Compression is the compression algorithm used for the RPC.
Compression string
}
// IsClient indicates if this is from client side.
func (s *OutHeader) IsClient() bool { return s.Client }
func (s *OutHeader) isRPCStats() {}
// OutTrailer contains stats when a trailer is sent.
type OutTrailer struct {
// Client is true if this OutTrailer is from client side.
Client bool
// WireLength is the wire length of trailer.
WireLength int
}
// IsClient indicates if this is from client side.
func (s *OutTrailer) IsClient() bool { return s.Client }
func (s *OutTrailer) isRPCStats() {}
// End contains stats when an RPC ends.
type End struct {
// Client is true if this End is from client side.
Client bool
// EndTime is the time when the RPC ends.
EndTime time.Time
// Error is the error just happened. Its type is gRPC error.
Error error
}
// IsClient indicates if this is from client side.
func (s *End) IsClient() bool { return s.Client }
func (s *End) isRPCStats() {}
// ConnStats contains stats information about connections.
type ConnStats interface {
isConnStats()
// IsClient returns true if this ConnStats is from client side.
IsClient() bool
}
// ConnBegin contains the stats of a connection when it is established.
type ConnBegin struct {
// Client is true if this ConnBegin is from client side.
Client bool
}
// IsClient indicates if this is from client side.
func (s *ConnBegin) IsClient() bool { return s.Client }
func (s *ConnBegin) isConnStats() {}
// ConnEnd contains the stats of a connection when it ends.
type ConnEnd struct {
// Client is true if this ConnEnd is from client side.
Client bool
}
// IsClient indicates if this is from client side.
func (s *ConnEnd) IsClient() bool { return s.Client }
func (s *ConnEnd) isConnStats() {}

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vendor/google.golang.org/grpc/stream.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"bytes"
"errors"
"io"
"math"
"sync"
"time"
"golang.org/x/net/context"
"golang.org/x/net/trace"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/transport"
)
// StreamHandler defines the handler called by gRPC server to complete the
// execution of a streaming RPC.
type StreamHandler func(srv interface{}, stream ServerStream) error
// StreamDesc represents a streaming RPC service's method specification.
type StreamDesc struct {
StreamName string
Handler StreamHandler
// At least one of these is true.
ServerStreams bool
ClientStreams bool
}
// Stream defines the common interface a client or server stream has to satisfy.
type Stream interface {
// Context returns the context for this stream.
Context() context.Context
// SendMsg blocks until it sends m, the stream is done or the stream
// breaks.
// On error, it aborts the stream and returns an RPC status on client
// side. On server side, it simply returns the error to the caller.
// SendMsg is called by generated code. Also Users can call SendMsg
// directly when it is really needed in their use cases.
SendMsg(m interface{}) error
// RecvMsg blocks until it receives a message or the stream is
// done. On client side, it returns io.EOF when the stream is done. On
// any other error, it aborts the stream and returns an RPC status. On
// server side, it simply returns the error to the caller.
RecvMsg(m interface{}) error
}
// ClientStream defines the interface a client stream has to satisfy.
type ClientStream interface {
// Header returns the header metadata received from the server if there
// is any. It blocks if the metadata is not ready to read.
Header() (metadata.MD, error)
// Trailer returns the trailer metadata from the server, if there is any.
// It must only be called after stream.CloseAndRecv has returned, or
// stream.Recv has returned a non-nil error (including io.EOF).
Trailer() metadata.MD
// CloseSend closes the send direction of the stream. It closes the stream
// when non-nil error is met.
CloseSend() error
Stream
}
// NewClientStream creates a new Stream for the client side. This is called
// by generated code.
func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
if cc.dopts.streamInt != nil {
return cc.dopts.streamInt(ctx, desc, cc, method, newClientStream, opts...)
}
return newClientStream(ctx, desc, cc, method, opts...)
}
func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
var (
t transport.ClientTransport
s *transport.Stream
put func()
)
c := defaultCallInfo
for _, o := range opts {
if err := o.before(&c); err != nil {
return nil, toRPCErr(err)
}
}
callHdr := &transport.CallHdr{
Host: cc.authority,
Method: method,
Flush: desc.ServerStreams && desc.ClientStreams,
}
if cc.dopts.cp != nil {
callHdr.SendCompress = cc.dopts.cp.Type()
}
var trInfo traceInfo
if EnableTracing {
trInfo.tr = trace.New("grpc.Sent."+methodFamily(method), method)
trInfo.firstLine.client = true
if deadline, ok := ctx.Deadline(); ok {
trInfo.firstLine.deadline = deadline.Sub(time.Now())
}
trInfo.tr.LazyLog(&trInfo.firstLine, false)
ctx = trace.NewContext(ctx, trInfo.tr)
defer func() {
if err != nil {
// Need to call tr.finish() if error is returned.
// Because tr will not be returned to caller.
trInfo.tr.LazyPrintf("RPC: [%v]", err)
trInfo.tr.SetError()
trInfo.tr.Finish()
}
}()
}
if stats.On() {
ctx = stats.TagRPC(ctx, &stats.RPCTagInfo{FullMethodName: method})
begin := &stats.Begin{
Client: true,
BeginTime: time.Now(),
FailFast: c.failFast,
}
stats.HandleRPC(ctx, begin)
}
defer func() {
if err != nil && stats.On() {
// Only handle end stats if err != nil.
end := &stats.End{
Client: true,
Error: err,
}
stats.HandleRPC(ctx, end)
}
}()
gopts := BalancerGetOptions{
BlockingWait: !c.failFast,
}
for {
t, put, err = cc.getTransport(ctx, gopts)
if err != nil {
// TODO(zhaoq): Probably revisit the error handling.
if _, ok := err.(*rpcError); ok {
return nil, err
}
if err == errConnClosing || err == errConnUnavailable {
if c.failFast {
return nil, Errorf(codes.Unavailable, "%v", err)
}
continue
}
// All the other errors are treated as Internal errors.
return nil, Errorf(codes.Internal, "%v", err)
}
s, err = t.NewStream(ctx, callHdr)
if err != nil {
if put != nil {
put()
put = nil
}
if _, ok := err.(transport.ConnectionError); ok || err == transport.ErrStreamDrain {
if c.failFast {
return nil, toRPCErr(err)
}
continue
}
return nil, toRPCErr(err)
}
break
}
cs := &clientStream{
opts: opts,
c: c,
desc: desc,
codec: cc.dopts.codec,
cp: cc.dopts.cp,
dc: cc.dopts.dc,
put: put,
t: t,
s: s,
p: &parser{r: s},
tracing: EnableTracing,
trInfo: trInfo,
statsCtx: ctx,
}
if cc.dopts.cp != nil {
cs.cbuf = new(bytes.Buffer)
}
// Listen on ctx.Done() to detect cancellation and s.Done() to detect normal termination
// when there is no pending I/O operations on this stream.
go func() {
select {
case <-t.Error():
// Incur transport error, simply exit.
case <-s.Done():
// TODO: The trace of the RPC is terminated here when there is no pending
// I/O, which is probably not the optimal solution.
if s.StatusCode() == codes.OK {
cs.finish(nil)
} else {
cs.finish(Errorf(s.StatusCode(), "%s", s.StatusDesc()))
}
cs.closeTransportStream(nil)
case <-s.GoAway():
cs.finish(errConnDrain)
cs.closeTransportStream(errConnDrain)
case <-s.Context().Done():
err := s.Context().Err()
cs.finish(err)
cs.closeTransportStream(transport.ContextErr(err))
}
}()
return cs, nil
}
// clientStream implements a client side Stream.
type clientStream struct {
opts []CallOption
c callInfo
t transport.ClientTransport
s *transport.Stream
p *parser
desc *StreamDesc
codec Codec
cp Compressor
cbuf *bytes.Buffer
dc Decompressor
tracing bool // set to EnableTracing when the clientStream is created.
mu sync.Mutex
put func()
closed bool
// trInfo.tr is set when the clientStream is created (if EnableTracing is true),
// and is set to nil when the clientStream's finish method is called.
trInfo traceInfo
// statsCtx keeps the user context for stats handling.
// All stats collection should use the statsCtx (instead of the stream context)
// so that all the generated stats for a particular RPC can be associated in the processing phase.
statsCtx context.Context
}
func (cs *clientStream) Context() context.Context {
return cs.s.Context()
}
func (cs *clientStream) Header() (metadata.MD, error) {
m, err := cs.s.Header()
if err != nil {
if _, ok := err.(transport.ConnectionError); !ok {
cs.closeTransportStream(err)
}
}
return m, err
}
func (cs *clientStream) Trailer() metadata.MD {
return cs.s.Trailer()
}
func (cs *clientStream) SendMsg(m interface{}) (err error) {
if cs.tracing {
cs.mu.Lock()
if cs.trInfo.tr != nil {
cs.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
}
cs.mu.Unlock()
}
// TODO Investigate how to signal the stats handling party.
// generate error stats if err != nil && err != io.EOF?
defer func() {
if err != nil {
cs.finish(err)
}
if err == nil {
return
}
if err == io.EOF {
// Specialize the process for server streaming. SendMesg is only called
// once when creating the stream object. io.EOF needs to be skipped when
// the rpc is early finished (before the stream object is created.).
// TODO: It is probably better to move this into the generated code.
if !cs.desc.ClientStreams && cs.desc.ServerStreams {
err = nil
}
return
}
if _, ok := err.(transport.ConnectionError); !ok {
cs.closeTransportStream(err)
}
err = toRPCErr(err)
}()
var outPayload *stats.OutPayload
if stats.On() {
outPayload = &stats.OutPayload{
Client: true,
}
}
out, err := encode(cs.codec, m, cs.cp, cs.cbuf, outPayload)
defer func() {
if cs.cbuf != nil {
cs.cbuf.Reset()
}
}()
if err != nil {
return Errorf(codes.Internal, "grpc: %v", err)
}
err = cs.t.Write(cs.s, out, &transport.Options{Last: false})
if err == nil && outPayload != nil {
outPayload.SentTime = time.Now()
stats.HandleRPC(cs.statsCtx, outPayload)
}
return err
}
func (cs *clientStream) RecvMsg(m interface{}) (err error) {
defer func() {
if err != nil && stats.On() {
// Only generate End if err != nil.
// If err == nil, it's not the last RecvMsg.
// The last RecvMsg gets either an RPC error or io.EOF.
end := &stats.End{
Client: true,
EndTime: time.Now(),
}
if err != io.EOF {
end.Error = toRPCErr(err)
}
stats.HandleRPC(cs.statsCtx, end)
}
}()
var inPayload *stats.InPayload
if stats.On() {
inPayload = &stats.InPayload{
Client: true,
}
}
err = recv(cs.p, cs.codec, cs.s, cs.dc, m, math.MaxInt32, inPayload)
defer func() {
// err != nil indicates the termination of the stream.
if err != nil {
cs.finish(err)
}
}()
if err == nil {
if cs.tracing {
cs.mu.Lock()
if cs.trInfo.tr != nil {
cs.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
}
cs.mu.Unlock()
}
if inPayload != nil {
stats.HandleRPC(cs.statsCtx, inPayload)
}
if !cs.desc.ClientStreams || cs.desc.ServerStreams {
return
}
// Special handling for client streaming rpc.
// This recv expects EOF or errors, so we don't collect inPayload.
err = recv(cs.p, cs.codec, cs.s, cs.dc, m, math.MaxInt32, nil)
cs.closeTransportStream(err)
if err == nil {
return toRPCErr(errors.New("grpc: client streaming protocol violation: get <nil>, want <EOF>"))
}
if err == io.EOF {
if cs.s.StatusCode() == codes.OK {
cs.finish(err)
return nil
}
return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
}
return toRPCErr(err)
}
if _, ok := err.(transport.ConnectionError); !ok {
cs.closeTransportStream(err)
}
if err == io.EOF {
if cs.s.StatusCode() == codes.OK {
// Returns io.EOF to indicate the end of the stream.
return
}
return Errorf(cs.s.StatusCode(), "%s", cs.s.StatusDesc())
}
return toRPCErr(err)
}
func (cs *clientStream) CloseSend() (err error) {
err = cs.t.Write(cs.s, nil, &transport.Options{Last: true})
defer func() {
if err != nil {
cs.finish(err)
}
}()
if err == nil || err == io.EOF {
return nil
}
if _, ok := err.(transport.ConnectionError); !ok {
cs.closeTransportStream(err)
}
err = toRPCErr(err)
return
}
func (cs *clientStream) closeTransportStream(err error) {
cs.mu.Lock()
if cs.closed {
cs.mu.Unlock()
return
}
cs.closed = true
cs.mu.Unlock()
cs.t.CloseStream(cs.s, err)
}
func (cs *clientStream) finish(err error) {
cs.mu.Lock()
defer cs.mu.Unlock()
for _, o := range cs.opts {
o.after(&cs.c)
}
if cs.put != nil {
cs.put()
cs.put = nil
}
if !cs.tracing {
return
}
if cs.trInfo.tr != nil {
if err == nil || err == io.EOF {
cs.trInfo.tr.LazyPrintf("RPC: [OK]")
} else {
cs.trInfo.tr.LazyPrintf("RPC: [%v]", err)
cs.trInfo.tr.SetError()
}
cs.trInfo.tr.Finish()
cs.trInfo.tr = nil
}
}
// ServerStream defines the interface a server stream has to satisfy.
type ServerStream interface {
// SetHeader sets the header metadata. It may be called multiple times.
// When call multiple times, all the provided metadata will be merged.
// All the metadata will be sent out when one of the following happens:
// - ServerStream.SendHeader() is called;
// - The first response is sent out;
// - An RPC status is sent out (error or success).
SetHeader(metadata.MD) error
// SendHeader sends the header metadata.
// The provided md and headers set by SetHeader() will be sent.
// It fails if called multiple times.
SendHeader(metadata.MD) error
// SetTrailer sets the trailer metadata which will be sent with the RPC status.
// When called more than once, all the provided metadata will be merged.
SetTrailer(metadata.MD)
Stream
}
// serverStream implements a server side Stream.
type serverStream struct {
t transport.ServerTransport
s *transport.Stream
p *parser
codec Codec
cp Compressor
dc Decompressor
cbuf *bytes.Buffer
maxMsgSize int
statusCode codes.Code
statusDesc string
trInfo *traceInfo
mu sync.Mutex // protects trInfo.tr after the service handler runs.
}
func (ss *serverStream) Context() context.Context {
return ss.s.Context()
}
func (ss *serverStream) SetHeader(md metadata.MD) error {
if md.Len() == 0 {
return nil
}
return ss.s.SetHeader(md)
}
func (ss *serverStream) SendHeader(md metadata.MD) error {
return ss.t.WriteHeader(ss.s, md)
}
func (ss *serverStream) SetTrailer(md metadata.MD) {
if md.Len() == 0 {
return
}
ss.s.SetTrailer(md)
return
}
func (ss *serverStream) SendMsg(m interface{}) (err error) {
defer func() {
if ss.trInfo != nil {
ss.mu.Lock()
if ss.trInfo.tr != nil {
if err == nil {
ss.trInfo.tr.LazyLog(&payload{sent: true, msg: m}, true)
} else {
ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
ss.trInfo.tr.SetError()
}
}
ss.mu.Unlock()
}
}()
var outPayload *stats.OutPayload
if stats.On() {
outPayload = &stats.OutPayload{}
}
out, err := encode(ss.codec, m, ss.cp, ss.cbuf, outPayload)
defer func() {
if ss.cbuf != nil {
ss.cbuf.Reset()
}
}()
if err != nil {
err = Errorf(codes.Internal, "grpc: %v", err)
return err
}
if err := ss.t.Write(ss.s, out, &transport.Options{Last: false}); err != nil {
return toRPCErr(err)
}
if outPayload != nil {
outPayload.SentTime = time.Now()
stats.HandleRPC(ss.s.Context(), outPayload)
}
return nil
}
func (ss *serverStream) RecvMsg(m interface{}) (err error) {
defer func() {
if ss.trInfo != nil {
ss.mu.Lock()
if ss.trInfo.tr != nil {
if err == nil {
ss.trInfo.tr.LazyLog(&payload{sent: false, msg: m}, true)
} else if err != io.EOF {
ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
ss.trInfo.tr.SetError()
}
}
ss.mu.Unlock()
}
}()
var inPayload *stats.InPayload
if stats.On() {
inPayload = &stats.InPayload{}
}
if err := recv(ss.p, ss.codec, ss.s, ss.dc, m, ss.maxMsgSize, inPayload); err != nil {
if err == io.EOF {
return err
}
if err == io.ErrUnexpectedEOF {
err = Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
}
return toRPCErr(err)
}
if inPayload != nil {
stats.HandleRPC(ss.s.Context(), inPayload)
}
return nil
}

54
vendor/google.golang.org/grpc/tap/tap.go generated vendored Normal file
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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// Package tap defines the function handles which are executed on the transport
// layer of gRPC-Go and related information. Everything here is EXPERIMENTAL.
package tap
import (
"golang.org/x/net/context"
)
// Info defines the relevant information needed by the handles.
type Info struct {
// FullMethodName is the string of grpc method (in the format of
// /package.service/method).
FullMethodName string
// TODO: More to be added.
}
// ServerInHandle defines the function which runs when a new stream is created
// on the server side. Note that it is executed in the per-connection I/O goroutine(s) instead
// of per-RPC goroutine. Therefore, users should NOT have any blocking/time-consuming
// work in this handle. Otherwise all the RPCs would slow down.
type ServerInHandle func(ctx context.Context, info *Info) (context.Context, error)

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vendor/google.golang.org/grpc/trace.go generated vendored Normal file
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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package grpc
import (
"bytes"
"fmt"
"io"
"net"
"strings"
"time"
"golang.org/x/net/trace"
)
// EnableTracing controls whether to trace RPCs using the golang.org/x/net/trace package.
// This should only be set before any RPCs are sent or received by this program.
var EnableTracing = true
// methodFamily returns the trace family for the given method.
// It turns "/pkg.Service/GetFoo" into "pkg.Service".
func methodFamily(m string) string {
m = strings.TrimPrefix(m, "/") // remove leading slash
if i := strings.Index(m, "/"); i >= 0 {
m = m[:i] // remove everything from second slash
}
if i := strings.LastIndex(m, "."); i >= 0 {
m = m[i+1:] // cut down to last dotted component
}
return m
}
// traceInfo contains tracing information for an RPC.
type traceInfo struct {
tr trace.Trace
firstLine firstLine
}
// firstLine is the first line of an RPC trace.
type firstLine struct {
client bool // whether this is a client (outgoing) RPC
remoteAddr net.Addr
deadline time.Duration // may be zero
}
func (f *firstLine) String() string {
var line bytes.Buffer
io.WriteString(&line, "RPC: ")
if f.client {
io.WriteString(&line, "to")
} else {
io.WriteString(&line, "from")
}
fmt.Fprintf(&line, " %v deadline:", f.remoteAddr)
if f.deadline != 0 {
fmt.Fprint(&line, f.deadline)
} else {
io.WriteString(&line, "none")
}
return line.String()
}
// payload represents an RPC request or response payload.
type payload struct {
sent bool // whether this is an outgoing payload
msg interface{} // e.g. a proto.Message
// TODO(dsymonds): add stringifying info to codec, and limit how much we hold here?
}
func (p payload) String() string {
if p.sent {
return fmt.Sprintf("sent: %v", p.msg)
}
return fmt.Sprintf("recv: %v", p.msg)
}
type fmtStringer struct {
format string
a []interface{}
}
func (f *fmtStringer) String() string {
return fmt.Sprintf(f.format, f.a...)
}
type stringer string
func (s stringer) String() string { return string(s) }

193
vendor/google.golang.org/grpc/transport/control.go generated vendored Normal file
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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"fmt"
"sync"
"golang.org/x/net/http2"
)
const (
// The default value of flow control window size in HTTP2 spec.
defaultWindowSize = 65535
// The initial window size for flow control.
initialWindowSize = defaultWindowSize // for an RPC
initialConnWindowSize = defaultWindowSize * 16 // for a connection
)
// The following defines various control items which could flow through
// the control buffer of transport. They represent different aspects of
// control tasks, e.g., flow control, settings, streaming resetting, etc.
type windowUpdate struct {
streamID uint32
increment uint32
}
func (*windowUpdate) item() {}
type settings struct {
ack bool
ss []http2.Setting
}
func (*settings) item() {}
type resetStream struct {
streamID uint32
code http2.ErrCode
}
func (*resetStream) item() {}
type goAway struct {
}
func (*goAway) item() {}
type flushIO struct {
}
func (*flushIO) item() {}
type ping struct {
ack bool
data [8]byte
}
func (*ping) item() {}
// quotaPool is a pool which accumulates the quota and sends it to acquire()
// when it is available.
type quotaPool struct {
c chan int
mu sync.Mutex
quota int
}
// newQuotaPool creates a quotaPool which has quota q available to consume.
func newQuotaPool(q int) *quotaPool {
qb := &quotaPool{
c: make(chan int, 1),
}
if q > 0 {
qb.c <- q
} else {
qb.quota = q
}
return qb
}
// add cancels the pending quota sent on acquired, incremented by v and sends
// it back on acquire.
func (qb *quotaPool) add(v int) {
qb.mu.Lock()
defer qb.mu.Unlock()
select {
case n := <-qb.c:
qb.quota += n
default:
}
qb.quota += v
if qb.quota <= 0 {
return
}
// After the pool has been created, this is the only place that sends on
// the channel. Since mu is held at this point and any quota that was sent
// on the channel has been retrieved, we know that this code will always
// place any positive quota value on the channel.
select {
case qb.c <- qb.quota:
qb.quota = 0
default:
}
}
// acquire returns the channel on which available quota amounts are sent.
func (qb *quotaPool) acquire() <-chan int {
return qb.c
}
// inFlow deals with inbound flow control
type inFlow struct {
// The inbound flow control limit for pending data.
limit uint32
mu sync.Mutex
// pendingData is the overall data which have been received but not been
// consumed by applications.
pendingData uint32
// The amount of data the application has consumed but grpc has not sent
// window update for them. Used to reduce window update frequency.
pendingUpdate uint32
}
// onData is invoked when some data frame is received. It updates pendingData.
func (f *inFlow) onData(n uint32) error {
f.mu.Lock()
defer f.mu.Unlock()
f.pendingData += n
if f.pendingData+f.pendingUpdate > f.limit {
return fmt.Errorf("received %d-bytes data exceeding the limit %d bytes", f.pendingData+f.pendingUpdate, f.limit)
}
return nil
}
// onRead is invoked when the application reads the data. It returns the window size
// to be sent to the peer.
func (f *inFlow) onRead(n uint32) uint32 {
f.mu.Lock()
defer f.mu.Unlock()
if f.pendingData == 0 {
return 0
}
f.pendingData -= n
f.pendingUpdate += n
if f.pendingUpdate >= f.limit/4 {
wu := f.pendingUpdate
f.pendingUpdate = 0
return wu
}
return 0
}
func (f *inFlow) resetPendingData() uint32 {
f.mu.Lock()
defer f.mu.Unlock()
n := f.pendingData
f.pendingData = 0
return n
}

46
vendor/google.golang.org/grpc/transport/go16.go generated vendored Normal file
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// +build go1.6,!go1.7
/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"net"
"golang.org/x/net/context"
)
// dialContext connects to the address on the named network.
func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
return (&net.Dialer{Cancel: ctx.Done()}).Dial(network, address)
}

46
vendor/google.golang.org/grpc/transport/go17.go generated vendored Normal file
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// +build go1.7
/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"net"
"golang.org/x/net/context"
)
// dialContext connects to the address on the named network.
func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
return (&net.Dialer{}).DialContext(ctx, network, address)
}

397
vendor/google.golang.org/grpc/transport/handler_server.go generated vendored Normal file
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/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
// This file is the implementation of a gRPC server using HTTP/2 which
// uses the standard Go http2 Server implementation (via the
// http.Handler interface), rather than speaking low-level HTTP/2
// frames itself. It is the implementation of *grpc.Server.ServeHTTP.
package transport
import (
"errors"
"fmt"
"io"
"net"
"net/http"
"strings"
"sync"
"time"
"golang.org/x/net/context"
"golang.org/x/net/http2"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
)
// NewServerHandlerTransport returns a ServerTransport handling gRPC
// from inside an http.Handler. It requires that the http Server
// supports HTTP/2.
func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request) (ServerTransport, error) {
if r.ProtoMajor != 2 {
return nil, errors.New("gRPC requires HTTP/2")
}
if r.Method != "POST" {
return nil, errors.New("invalid gRPC request method")
}
if !validContentType(r.Header.Get("Content-Type")) {
return nil, errors.New("invalid gRPC request content-type")
}
if _, ok := w.(http.Flusher); !ok {
return nil, errors.New("gRPC requires a ResponseWriter supporting http.Flusher")
}
if _, ok := w.(http.CloseNotifier); !ok {
return nil, errors.New("gRPC requires a ResponseWriter supporting http.CloseNotifier")
}
st := &serverHandlerTransport{
rw: w,
req: r,
closedCh: make(chan struct{}),
writes: make(chan func()),
}
if v := r.Header.Get("grpc-timeout"); v != "" {
to, err := decodeTimeout(v)
if err != nil {
return nil, streamErrorf(codes.Internal, "malformed time-out: %v", err)
}
st.timeoutSet = true
st.timeout = to
}
var metakv []string
if r.Host != "" {
metakv = append(metakv, ":authority", r.Host)
}
for k, vv := range r.Header {
k = strings.ToLower(k)
if isReservedHeader(k) && !isWhitelistedPseudoHeader(k) {
continue
}
for _, v := range vv {
if k == "user-agent" {
// user-agent is special. Copying logic of http_util.go.
if i := strings.LastIndex(v, " "); i == -1 {
// There is no application user agent string being set
continue
} else {
v = v[:i]
}
}
metakv = append(metakv, k, v)
}
}
st.headerMD = metadata.Pairs(metakv...)
return st, nil
}
// serverHandlerTransport is an implementation of ServerTransport
// which replies to exactly one gRPC request (exactly one HTTP request),
// using the net/http.Handler interface. This http.Handler is guaranteed
// at this point to be speaking over HTTP/2, so it's able to speak valid
// gRPC.
type serverHandlerTransport struct {
rw http.ResponseWriter
req *http.Request
timeoutSet bool
timeout time.Duration
didCommonHeaders bool
headerMD metadata.MD
closeOnce sync.Once
closedCh chan struct{} // closed on Close
// writes is a channel of code to run serialized in the
// ServeHTTP (HandleStreams) goroutine. The channel is closed
// when WriteStatus is called.
writes chan func()
}
func (ht *serverHandlerTransport) Close() error {
ht.closeOnce.Do(ht.closeCloseChanOnce)
return nil
}
func (ht *serverHandlerTransport) closeCloseChanOnce() { close(ht.closedCh) }
func (ht *serverHandlerTransport) RemoteAddr() net.Addr { return strAddr(ht.req.RemoteAddr) }
// strAddr is a net.Addr backed by either a TCP "ip:port" string, or
// the empty string if unknown.
type strAddr string
func (a strAddr) Network() string {
if a != "" {
// Per the documentation on net/http.Request.RemoteAddr, if this is
// set, it's set to the IP:port of the peer (hence, TCP):
// https://golang.org/pkg/net/http/#Request
//
// If we want to support Unix sockets later, we can
// add our own grpc-specific convention within the
// grpc codebase to set RemoteAddr to a different
// format, or probably better: we can attach it to the
// context and use that from serverHandlerTransport.RemoteAddr.
return "tcp"
}
return ""
}
func (a strAddr) String() string { return string(a) }
// do runs fn in the ServeHTTP goroutine.
func (ht *serverHandlerTransport) do(fn func()) error {
select {
case ht.writes <- fn:
return nil
case <-ht.closedCh:
return ErrConnClosing
}
}
func (ht *serverHandlerTransport) WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error {
err := ht.do(func() {
ht.writeCommonHeaders(s)
// And flush, in case no header or body has been sent yet.
// This forces a separation of headers and trailers if this is the
// first call (for example, in end2end tests's TestNoService).
ht.rw.(http.Flusher).Flush()
h := ht.rw.Header()
h.Set("Grpc-Status", fmt.Sprintf("%d", statusCode))
if statusDesc != "" {
h.Set("Grpc-Message", encodeGrpcMessage(statusDesc))
}
if md := s.Trailer(); len(md) > 0 {
for k, vv := range md {
// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
if isReservedHeader(k) {
continue
}
for _, v := range vv {
// http2 ResponseWriter mechanism to
// send undeclared Trailers after the
// headers have possibly been written.
h.Add(http2.TrailerPrefix+k, v)
}
}
}
})
close(ht.writes)
return err
}
// writeCommonHeaders sets common headers on the first write
// call (Write, WriteHeader, or WriteStatus).
func (ht *serverHandlerTransport) writeCommonHeaders(s *Stream) {
if ht.didCommonHeaders {
return
}
ht.didCommonHeaders = true
h := ht.rw.Header()
h["Date"] = nil // suppress Date to make tests happy; TODO: restore
h.Set("Content-Type", "application/grpc")
// Predeclare trailers we'll set later in WriteStatus (after the body).
// This is a SHOULD in the HTTP RFC, and the way you add (known)
// Trailers per the net/http.ResponseWriter contract.
// See https://golang.org/pkg/net/http/#ResponseWriter
// and https://golang.org/pkg/net/http/#example_ResponseWriter_trailers
h.Add("Trailer", "Grpc-Status")
h.Add("Trailer", "Grpc-Message")
if s.sendCompress != "" {
h.Set("Grpc-Encoding", s.sendCompress)
}
}
func (ht *serverHandlerTransport) Write(s *Stream, data []byte, opts *Options) error {
return ht.do(func() {
ht.writeCommonHeaders(s)
ht.rw.Write(data)
if !opts.Delay {
ht.rw.(http.Flusher).Flush()
}
})
}
func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
return ht.do(func() {
ht.writeCommonHeaders(s)
h := ht.rw.Header()
for k, vv := range md {
// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
if isReservedHeader(k) {
continue
}
for _, v := range vv {
h.Add(k, v)
}
}
ht.rw.WriteHeader(200)
ht.rw.(http.Flusher).Flush()
})
}
func (ht *serverHandlerTransport) HandleStreams(startStream func(*Stream), traceCtx func(context.Context, string) context.Context) {
// With this transport type there will be exactly 1 stream: this HTTP request.
var ctx context.Context
var cancel context.CancelFunc
if ht.timeoutSet {
ctx, cancel = context.WithTimeout(context.Background(), ht.timeout)
} else {
ctx, cancel = context.WithCancel(context.Background())
}
// requestOver is closed when either the request's context is done
// or the status has been written via WriteStatus.
requestOver := make(chan struct{})
// clientGone receives a single value if peer is gone, either
// because the underlying connection is dead or because the
// peer sends an http2 RST_STREAM.
clientGone := ht.rw.(http.CloseNotifier).CloseNotify()
go func() {
select {
case <-requestOver:
return
case <-ht.closedCh:
case <-clientGone:
}
cancel()
}()
req := ht.req
s := &Stream{
id: 0, // irrelevant
windowHandler: func(int) {}, // nothing
cancel: cancel,
buf: newRecvBuffer(),
st: ht,
method: req.URL.Path,
recvCompress: req.Header.Get("grpc-encoding"),
}
pr := &peer.Peer{
Addr: ht.RemoteAddr(),
}
if req.TLS != nil {
pr.AuthInfo = credentials.TLSInfo{State: *req.TLS}
}
ctx = metadata.NewContext(ctx, ht.headerMD)
ctx = peer.NewContext(ctx, pr)
s.ctx = newContextWithStream(ctx, s)
s.dec = &recvBufferReader{ctx: s.ctx, recv: s.buf}
// readerDone is closed when the Body.Read-ing goroutine exits.
readerDone := make(chan struct{})
go func() {
defer close(readerDone)
// TODO: minimize garbage, optimize recvBuffer code/ownership
const readSize = 8196
for buf := make([]byte, readSize); ; {
n, err := req.Body.Read(buf)
if n > 0 {
s.buf.put(&recvMsg{data: buf[:n:n]})
buf = buf[n:]
}
if err != nil {
s.buf.put(&recvMsg{err: mapRecvMsgError(err)})
return
}
if len(buf) == 0 {
buf = make([]byte, readSize)
}
}
}()
// startStream is provided by the *grpc.Server's serveStreams.
// It starts a goroutine serving s and exits immediately.
// The goroutine that is started is the one that then calls
// into ht, calling WriteHeader, Write, WriteStatus, Close, etc.
startStream(s)
ht.runStream()
close(requestOver)
// Wait for reading goroutine to finish.
req.Body.Close()
<-readerDone
}
func (ht *serverHandlerTransport) runStream() {
for {
select {
case fn, ok := <-ht.writes:
if !ok {
return
}
fn()
case <-ht.closedCh:
return
}
}
}
func (ht *serverHandlerTransport) Drain() {
panic("Drain() is not implemented")
}
// mapRecvMsgError returns the non-nil err into the appropriate
// error value as expected by callers of *grpc.parser.recvMsg.
// In particular, in can only be:
// * io.EOF
// * io.ErrUnexpectedEOF
// * of type transport.ConnectionError
// * of type transport.StreamError
func mapRecvMsgError(err error) error {
if err == io.EOF || err == io.ErrUnexpectedEOF {
return err
}
if se, ok := err.(http2.StreamError); ok {
if code, ok := http2ErrConvTab[se.Code]; ok {
return StreamError{
Code: code,
Desc: se.Error(),
}
}
}
return connectionErrorf(true, err, err.Error())
}

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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"bytes"
"errors"
"io"
"math"
"net"
"strconv"
"sync"
"golang.org/x/net/context"
"golang.org/x/net/http2"
"golang.org/x/net/http2/hpack"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/tap"
)
// ErrIllegalHeaderWrite indicates that setting header is illegal because of
// the stream's state.
var ErrIllegalHeaderWrite = errors.New("transport: the stream is done or WriteHeader was already called")
// http2Server implements the ServerTransport interface with HTTP2.
type http2Server struct {
ctx context.Context
conn net.Conn
remoteAddr net.Addr
localAddr net.Addr
maxStreamID uint32 // max stream ID ever seen
authInfo credentials.AuthInfo // auth info about the connection
inTapHandle tap.ServerInHandle
// writableChan synchronizes write access to the transport.
// A writer acquires the write lock by receiving a value on writableChan
// and releases it by sending on writableChan.
writableChan chan int
// shutdownChan is closed when Close is called.
// Blocking operations should select on shutdownChan to avoid
// blocking forever after Close.
shutdownChan chan struct{}
framer *framer
hBuf *bytes.Buffer // the buffer for HPACK encoding
hEnc *hpack.Encoder // HPACK encoder
// The max number of concurrent streams.
maxStreams uint32
// controlBuf delivers all the control related tasks (e.g., window
// updates, reset streams, and various settings) to the controller.
controlBuf *recvBuffer
fc *inFlow
// sendQuotaPool provides flow control to outbound message.
sendQuotaPool *quotaPool
mu sync.Mutex // guard the following
state transportState
activeStreams map[uint32]*Stream
// the per-stream outbound flow control window size set by the peer.
streamSendQuota uint32
}
// newHTTP2Server constructs a ServerTransport based on HTTP2. ConnectionError is
// returned if something goes wrong.
func newHTTP2Server(conn net.Conn, config *ServerConfig) (_ ServerTransport, err error) {
framer := newFramer(conn)
// Send initial settings as connection preface to client.
var settings []http2.Setting
// TODO(zhaoq): Have a better way to signal "no limit" because 0 is
// permitted in the HTTP2 spec.
maxStreams := config.MaxStreams
if maxStreams == 0 {
maxStreams = math.MaxUint32
} else {
settings = append(settings, http2.Setting{
ID: http2.SettingMaxConcurrentStreams,
Val: maxStreams,
})
}
if initialWindowSize != defaultWindowSize {
settings = append(settings, http2.Setting{
ID: http2.SettingInitialWindowSize,
Val: uint32(initialWindowSize)})
}
if err := framer.writeSettings(true, settings...); err != nil {
return nil, connectionErrorf(true, err, "transport: %v", err)
}
// Adjust the connection flow control window if needed.
if delta := uint32(initialConnWindowSize - defaultWindowSize); delta > 0 {
if err := framer.writeWindowUpdate(true, 0, delta); err != nil {
return nil, connectionErrorf(true, err, "transport: %v", err)
}
}
var buf bytes.Buffer
t := &http2Server{
ctx: context.Background(),
conn: conn,
remoteAddr: conn.RemoteAddr(),
localAddr: conn.LocalAddr(),
authInfo: config.AuthInfo,
framer: framer,
hBuf: &buf,
hEnc: hpack.NewEncoder(&buf),
maxStreams: maxStreams,
inTapHandle: config.InTapHandle,
controlBuf: newRecvBuffer(),
fc: &inFlow{limit: initialConnWindowSize},
sendQuotaPool: newQuotaPool(defaultWindowSize),
state: reachable,
writableChan: make(chan int, 1),
shutdownChan: make(chan struct{}),
activeStreams: make(map[uint32]*Stream),
streamSendQuota: defaultWindowSize,
}
if stats.On() {
t.ctx = stats.TagConn(t.ctx, &stats.ConnTagInfo{
RemoteAddr: t.remoteAddr,
LocalAddr: t.localAddr,
})
connBegin := &stats.ConnBegin{}
stats.HandleConn(t.ctx, connBegin)
}
go t.controller()
t.writableChan <- 0
return t, nil
}
// operateHeader takes action on the decoded headers.
func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(*Stream), traceCtx func(context.Context, string) context.Context) (close bool) {
buf := newRecvBuffer()
s := &Stream{
id: frame.Header().StreamID,
st: t,
buf: buf,
fc: &inFlow{limit: initialWindowSize},
}
var state decodeState
for _, hf := range frame.Fields {
state.processHeaderField(hf)
}
if err := state.err; err != nil {
if se, ok := err.(StreamError); ok {
t.controlBuf.put(&resetStream{s.id, statusCodeConvTab[se.Code]})
}
return
}
if frame.StreamEnded() {
// s is just created by the caller. No lock needed.
s.state = streamReadDone
}
s.recvCompress = state.encoding
if state.timeoutSet {
s.ctx, s.cancel = context.WithTimeout(t.ctx, state.timeout)
} else {
s.ctx, s.cancel = context.WithCancel(t.ctx)
}
pr := &peer.Peer{
Addr: t.remoteAddr,
}
// Attach Auth info if there is any.
if t.authInfo != nil {
pr.AuthInfo = t.authInfo
}
s.ctx = peer.NewContext(s.ctx, pr)
// Cache the current stream to the context so that the server application
// can find out. Required when the server wants to send some metadata
// back to the client (unary call only).
s.ctx = newContextWithStream(s.ctx, s)
// Attach the received metadata to the context.
if len(state.mdata) > 0 {
s.ctx = metadata.NewContext(s.ctx, state.mdata)
}
s.dec = &recvBufferReader{
ctx: s.ctx,
recv: s.buf,
}
s.recvCompress = state.encoding
s.method = state.method
if t.inTapHandle != nil {
var err error
info := &tap.Info{
FullMethodName: state.method,
}
s.ctx, err = t.inTapHandle(s.ctx, info)
if err != nil {
// TODO: Log the real error.
t.controlBuf.put(&resetStream{s.id, http2.ErrCodeRefusedStream})
return
}
}
t.mu.Lock()
if t.state != reachable {
t.mu.Unlock()
return
}
if uint32(len(t.activeStreams)) >= t.maxStreams {
t.mu.Unlock()
t.controlBuf.put(&resetStream{s.id, http2.ErrCodeRefusedStream})
return
}
if s.id%2 != 1 || s.id <= t.maxStreamID {
t.mu.Unlock()
// illegal gRPC stream id.
grpclog.Println("transport: http2Server.HandleStreams received an illegal stream id: ", s.id)
return true
}
t.maxStreamID = s.id
s.sendQuotaPool = newQuotaPool(int(t.streamSendQuota))
t.activeStreams[s.id] = s
t.mu.Unlock()
s.windowHandler = func(n int) {
t.updateWindow(s, uint32(n))
}
s.ctx = traceCtx(s.ctx, s.method)
if stats.On() {
s.ctx = stats.TagRPC(s.ctx, &stats.RPCTagInfo{FullMethodName: s.method})
inHeader := &stats.InHeader{
FullMethod: s.method,
RemoteAddr: t.remoteAddr,
LocalAddr: t.localAddr,
Compression: s.recvCompress,
WireLength: int(frame.Header().Length),
}
stats.HandleRPC(s.ctx, inHeader)
}
handle(s)
return
}
// HandleStreams receives incoming streams using the given handler. This is
// typically run in a separate goroutine.
// traceCtx attaches trace to ctx and returns the new context.
func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.Context, string) context.Context) {
// Check the validity of client preface.
preface := make([]byte, len(clientPreface))
if _, err := io.ReadFull(t.conn, preface); err != nil {
grpclog.Printf("transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
t.Close()
return
}
if !bytes.Equal(preface, clientPreface) {
grpclog.Printf("transport: http2Server.HandleStreams received bogus greeting from client: %q", preface)
t.Close()
return
}
frame, err := t.framer.readFrame()
if err == io.EOF || err == io.ErrUnexpectedEOF {
t.Close()
return
}
if err != nil {
grpclog.Printf("transport: http2Server.HandleStreams failed to read frame: %v", err)
t.Close()
return
}
sf, ok := frame.(*http2.SettingsFrame)
if !ok {
grpclog.Printf("transport: http2Server.HandleStreams saw invalid preface type %T from client", frame)
t.Close()
return
}
t.handleSettings(sf)
for {
frame, err := t.framer.readFrame()
if err != nil {
if se, ok := err.(http2.StreamError); ok {
t.mu.Lock()
s := t.activeStreams[se.StreamID]
t.mu.Unlock()
if s != nil {
t.closeStream(s)
}
t.controlBuf.put(&resetStream{se.StreamID, se.Code})
continue
}
if err == io.EOF || err == io.ErrUnexpectedEOF {
t.Close()
return
}
grpclog.Printf("transport: http2Server.HandleStreams failed to read frame: %v", err)
t.Close()
return
}
switch frame := frame.(type) {
case *http2.MetaHeadersFrame:
if t.operateHeaders(frame, handle, traceCtx) {
t.Close()
break
}
case *http2.DataFrame:
t.handleData(frame)
case *http2.RSTStreamFrame:
t.handleRSTStream(frame)
case *http2.SettingsFrame:
t.handleSettings(frame)
case *http2.PingFrame:
t.handlePing(frame)
case *http2.WindowUpdateFrame:
t.handleWindowUpdate(frame)
case *http2.GoAwayFrame:
// TODO: Handle GoAway from the client appropriately.
default:
grpclog.Printf("transport: http2Server.HandleStreams found unhandled frame type %v.", frame)
}
}
}
func (t *http2Server) getStream(f http2.Frame) (*Stream, bool) {
t.mu.Lock()
defer t.mu.Unlock()
if t.activeStreams == nil {
// The transport is closing.
return nil, false
}
s, ok := t.activeStreams[f.Header().StreamID]
if !ok {
// The stream is already done.
return nil, false
}
return s, true
}
// updateWindow adjusts the inbound quota for the stream and the transport.
// Window updates will deliver to the controller for sending when
// the cumulative quota exceeds the corresponding threshold.
func (t *http2Server) updateWindow(s *Stream, n uint32) {
s.mu.Lock()
defer s.mu.Unlock()
if s.state == streamDone {
return
}
if w := t.fc.onRead(n); w > 0 {
t.controlBuf.put(&windowUpdate{0, w})
}
if w := s.fc.onRead(n); w > 0 {
t.controlBuf.put(&windowUpdate{s.id, w})
}
}
func (t *http2Server) handleData(f *http2.DataFrame) {
size := len(f.Data())
if err := t.fc.onData(uint32(size)); err != nil {
grpclog.Printf("transport: http2Server %v", err)
t.Close()
return
}
// Select the right stream to dispatch.
s, ok := t.getStream(f)
if !ok {
if w := t.fc.onRead(uint32(size)); w > 0 {
t.controlBuf.put(&windowUpdate{0, w})
}
return
}
if size > 0 {
s.mu.Lock()
if s.state == streamDone {
s.mu.Unlock()
// The stream has been closed. Release the corresponding quota.
if w := t.fc.onRead(uint32(size)); w > 0 {
t.controlBuf.put(&windowUpdate{0, w})
}
return
}
if err := s.fc.onData(uint32(size)); err != nil {
s.mu.Unlock()
t.closeStream(s)
t.controlBuf.put(&resetStream{s.id, http2.ErrCodeFlowControl})
return
}
s.mu.Unlock()
// TODO(bradfitz, zhaoq): A copy is required here because there is no
// guarantee f.Data() is consumed before the arrival of next frame.
// Can this copy be eliminated?
data := make([]byte, size)
copy(data, f.Data())
s.write(recvMsg{data: data})
}
if f.Header().Flags.Has(http2.FlagDataEndStream) {
// Received the end of stream from the client.
s.mu.Lock()
if s.state != streamDone {
s.state = streamReadDone
}
s.mu.Unlock()
s.write(recvMsg{err: io.EOF})
}
}
func (t *http2Server) handleRSTStream(f *http2.RSTStreamFrame) {
s, ok := t.getStream(f)
if !ok {
return
}
t.closeStream(s)
}
func (t *http2Server) handleSettings(f *http2.SettingsFrame) {
if f.IsAck() {
return
}
var ss []http2.Setting
f.ForeachSetting(func(s http2.Setting) error {
ss = append(ss, s)
return nil
})
// The settings will be applied once the ack is sent.
t.controlBuf.put(&settings{ack: true, ss: ss})
}
func (t *http2Server) handlePing(f *http2.PingFrame) {
if f.IsAck() { // Do nothing.
return
}
pingAck := &ping{ack: true}
copy(pingAck.data[:], f.Data[:])
t.controlBuf.put(pingAck)
}
func (t *http2Server) handleWindowUpdate(f *http2.WindowUpdateFrame) {
id := f.Header().StreamID
incr := f.Increment
if id == 0 {
t.sendQuotaPool.add(int(incr))
return
}
if s, ok := t.getStream(f); ok {
s.sendQuotaPool.add(int(incr))
}
}
func (t *http2Server) writeHeaders(s *Stream, b *bytes.Buffer, endStream bool) error {
first := true
endHeaders := false
var err error
// Sends the headers in a single batch.
for !endHeaders {
size := t.hBuf.Len()
if size > http2MaxFrameLen {
size = http2MaxFrameLen
} else {
endHeaders = true
}
if first {
p := http2.HeadersFrameParam{
StreamID: s.id,
BlockFragment: b.Next(size),
EndStream: endStream,
EndHeaders: endHeaders,
}
err = t.framer.writeHeaders(endHeaders, p)
first = false
} else {
err = t.framer.writeContinuation(endHeaders, s.id, endHeaders, b.Next(size))
}
if err != nil {
t.Close()
return connectionErrorf(true, err, "transport: %v", err)
}
}
return nil
}
// WriteHeader sends the header metedata md back to the client.
func (t *http2Server) WriteHeader(s *Stream, md metadata.MD) error {
s.mu.Lock()
if s.headerOk || s.state == streamDone {
s.mu.Unlock()
return ErrIllegalHeaderWrite
}
s.headerOk = true
if md.Len() > 0 {
if s.header.Len() > 0 {
s.header = metadata.Join(s.header, md)
} else {
s.header = md
}
}
md = s.header
s.mu.Unlock()
if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
return err
}
t.hBuf.Reset()
t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
if s.sendCompress != "" {
t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-encoding", Value: s.sendCompress})
}
for k, v := range md {
if isReservedHeader(k) {
// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
continue
}
for _, entry := range v {
t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
}
}
bufLen := t.hBuf.Len()
if err := t.writeHeaders(s, t.hBuf, false); err != nil {
return err
}
if stats.On() {
outHeader := &stats.OutHeader{
WireLength: bufLen,
}
stats.HandleRPC(s.Context(), outHeader)
}
t.writableChan <- 0
return nil
}
// WriteStatus sends stream status to the client and terminates the stream.
// There is no further I/O operations being able to perform on this stream.
// TODO(zhaoq): Now it indicates the end of entire stream. Revisit if early
// OK is adopted.
func (t *http2Server) WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error {
var headersSent, hasHeader bool
s.mu.Lock()
if s.state == streamDone {
s.mu.Unlock()
return nil
}
if s.headerOk {
headersSent = true
}
if s.header.Len() > 0 {
hasHeader = true
}
s.mu.Unlock()
if !headersSent && hasHeader {
t.WriteHeader(s, nil)
headersSent = true
}
if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
return err
}
t.hBuf.Reset()
if !headersSent {
t.hEnc.WriteField(hpack.HeaderField{Name: ":status", Value: "200"})
t.hEnc.WriteField(hpack.HeaderField{Name: "content-type", Value: "application/grpc"})
}
t.hEnc.WriteField(
hpack.HeaderField{
Name: "grpc-status",
Value: strconv.Itoa(int(statusCode)),
})
t.hEnc.WriteField(hpack.HeaderField{Name: "grpc-message", Value: encodeGrpcMessage(statusDesc)})
// Attach the trailer metadata.
for k, v := range s.trailer {
// Clients don't tolerate reading restricted headers after some non restricted ones were sent.
if isReservedHeader(k) {
continue
}
for _, entry := range v {
t.hEnc.WriteField(hpack.HeaderField{Name: k, Value: entry})
}
}
bufLen := t.hBuf.Len()
if err := t.writeHeaders(s, t.hBuf, true); err != nil {
t.Close()
return err
}
if stats.On() {
outTrailer := &stats.OutTrailer{
WireLength: bufLen,
}
stats.HandleRPC(s.Context(), outTrailer)
}
t.closeStream(s)
t.writableChan <- 0
return nil
}
// Write converts the data into HTTP2 data frame and sends it out. Non-nil error
// is returns if it fails (e.g., framing error, transport error).
func (t *http2Server) Write(s *Stream, data []byte, opts *Options) error {
// TODO(zhaoq): Support multi-writers for a single stream.
var writeHeaderFrame bool
s.mu.Lock()
if s.state == streamDone {
s.mu.Unlock()
return streamErrorf(codes.Unknown, "the stream has been done")
}
if !s.headerOk {
writeHeaderFrame = true
}
s.mu.Unlock()
if writeHeaderFrame {
t.WriteHeader(s, nil)
}
r := bytes.NewBuffer(data)
for {
if r.Len() == 0 {
return nil
}
size := http2MaxFrameLen
// Wait until the stream has some quota to send the data.
sq, err := wait(s.ctx, nil, nil, t.shutdownChan, s.sendQuotaPool.acquire())
if err != nil {
return err
}
// Wait until the transport has some quota to send the data.
tq, err := wait(s.ctx, nil, nil, t.shutdownChan, t.sendQuotaPool.acquire())
if err != nil {
return err
}
if sq < size {
size = sq
}
if tq < size {
size = tq
}
p := r.Next(size)
ps := len(p)
if ps < sq {
// Overbooked stream quota. Return it back.
s.sendQuotaPool.add(sq - ps)
}
if ps < tq {
// Overbooked transport quota. Return it back.
t.sendQuotaPool.add(tq - ps)
}
t.framer.adjustNumWriters(1)
// Got some quota. Try to acquire writing privilege on the
// transport.
if _, err := wait(s.ctx, nil, nil, t.shutdownChan, t.writableChan); err != nil {
if _, ok := err.(StreamError); ok {
// Return the connection quota back.
t.sendQuotaPool.add(ps)
}
if t.framer.adjustNumWriters(-1) == 0 {
// This writer is the last one in this batch and has the
// responsibility to flush the buffered frames. It queues
// a flush request to controlBuf instead of flushing directly
// in order to avoid the race with other writing or flushing.
t.controlBuf.put(&flushIO{})
}
return err
}
select {
case <-s.ctx.Done():
t.sendQuotaPool.add(ps)
if t.framer.adjustNumWriters(-1) == 0 {
t.controlBuf.put(&flushIO{})
}
t.writableChan <- 0
return ContextErr(s.ctx.Err())
default:
}
var forceFlush bool
if r.Len() == 0 && t.framer.adjustNumWriters(0) == 1 && !opts.Last {
forceFlush = true
}
if err := t.framer.writeData(forceFlush, s.id, false, p); err != nil {
t.Close()
return connectionErrorf(true, err, "transport: %v", err)
}
if t.framer.adjustNumWriters(-1) == 0 {
t.framer.flushWrite()
}
t.writableChan <- 0
}
}
func (t *http2Server) applySettings(ss []http2.Setting) {
for _, s := range ss {
if s.ID == http2.SettingInitialWindowSize {
t.mu.Lock()
defer t.mu.Unlock()
for _, stream := range t.activeStreams {
stream.sendQuotaPool.add(int(s.Val - t.streamSendQuota))
}
t.streamSendQuota = s.Val
}
}
}
// controller running in a separate goroutine takes charge of sending control
// frames (e.g., window update, reset stream, setting, etc.) to the server.
func (t *http2Server) controller() {
for {
select {
case i := <-t.controlBuf.get():
t.controlBuf.load()
select {
case <-t.writableChan:
switch i := i.(type) {
case *windowUpdate:
t.framer.writeWindowUpdate(true, i.streamID, i.increment)
case *settings:
if i.ack {
t.framer.writeSettingsAck(true)
t.applySettings(i.ss)
} else {
t.framer.writeSettings(true, i.ss...)
}
case *resetStream:
t.framer.writeRSTStream(true, i.streamID, i.code)
case *goAway:
t.mu.Lock()
if t.state == closing {
t.mu.Unlock()
// The transport is closing.
return
}
sid := t.maxStreamID
t.state = draining
t.mu.Unlock()
t.framer.writeGoAway(true, sid, http2.ErrCodeNo, nil)
case *flushIO:
t.framer.flushWrite()
case *ping:
t.framer.writePing(true, i.ack, i.data)
default:
grpclog.Printf("transport: http2Server.controller got unexpected item type %v\n", i)
}
t.writableChan <- 0
continue
case <-t.shutdownChan:
return
}
case <-t.shutdownChan:
return
}
}
}
// Close starts shutting down the http2Server transport.
// TODO(zhaoq): Now the destruction is not blocked on any pending streams. This
// could cause some resource issue. Revisit this later.
func (t *http2Server) Close() (err error) {
t.mu.Lock()
if t.state == closing {
t.mu.Unlock()
return errors.New("transport: Close() was already called")
}
t.state = closing
streams := t.activeStreams
t.activeStreams = nil
t.mu.Unlock()
close(t.shutdownChan)
err = t.conn.Close()
// Cancel all active streams.
for _, s := range streams {
s.cancel()
}
if stats.On() {
connEnd := &stats.ConnEnd{}
stats.HandleConn(t.ctx, connEnd)
}
return
}
// closeStream clears the footprint of a stream when the stream is not needed
// any more.
func (t *http2Server) closeStream(s *Stream) {
t.mu.Lock()
delete(t.activeStreams, s.id)
if t.state == draining && len(t.activeStreams) == 0 {
defer t.Close()
}
t.mu.Unlock()
// In case stream sending and receiving are invoked in separate
// goroutines (e.g., bi-directional streaming), cancel needs to be
// called to interrupt the potential blocking on other goroutines.
s.cancel()
s.mu.Lock()
if q := s.fc.resetPendingData(); q > 0 {
if w := t.fc.onRead(q); w > 0 {
t.controlBuf.put(&windowUpdate{0, w})
}
}
if s.state == streamDone {
s.mu.Unlock()
return
}
s.state = streamDone
s.mu.Unlock()
}
func (t *http2Server) RemoteAddr() net.Addr {
return t.remoteAddr
}
func (t *http2Server) Drain() {
t.controlBuf.put(&goAway{})
}

513
vendor/google.golang.org/grpc/transport/http_util.go generated vendored Normal file
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@ -0,0 +1,513 @@
/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"bufio"
"bytes"
"fmt"
"io"
"net"
"strconv"
"strings"
"sync/atomic"
"time"
"golang.org/x/net/http2"
"golang.org/x/net/http2/hpack"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/metadata"
)
const (
// The primary user agent
primaryUA = "grpc-go/1.0"
// http2MaxFrameLen specifies the max length of a HTTP2 frame.
http2MaxFrameLen = 16384 // 16KB frame
// http://http2.github.io/http2-spec/#SettingValues
http2InitHeaderTableSize = 4096
// http2IOBufSize specifies the buffer size for sending frames.
http2IOBufSize = 32 * 1024
)
var (
clientPreface = []byte(http2.ClientPreface)
http2ErrConvTab = map[http2.ErrCode]codes.Code{
http2.ErrCodeNo: codes.Internal,
http2.ErrCodeProtocol: codes.Internal,
http2.ErrCodeInternal: codes.Internal,
http2.ErrCodeFlowControl: codes.ResourceExhausted,
http2.ErrCodeSettingsTimeout: codes.Internal,
http2.ErrCodeStreamClosed: codes.Internal,
http2.ErrCodeFrameSize: codes.Internal,
http2.ErrCodeRefusedStream: codes.Unavailable,
http2.ErrCodeCancel: codes.Canceled,
http2.ErrCodeCompression: codes.Internal,
http2.ErrCodeConnect: codes.Internal,
http2.ErrCodeEnhanceYourCalm: codes.ResourceExhausted,
http2.ErrCodeInadequateSecurity: codes.PermissionDenied,
http2.ErrCodeHTTP11Required: codes.FailedPrecondition,
}
statusCodeConvTab = map[codes.Code]http2.ErrCode{
codes.Internal: http2.ErrCodeInternal,
codes.Canceled: http2.ErrCodeCancel,
codes.Unavailable: http2.ErrCodeRefusedStream,
codes.ResourceExhausted: http2.ErrCodeEnhanceYourCalm,
codes.PermissionDenied: http2.ErrCodeInadequateSecurity,
}
)
// Records the states during HPACK decoding. Must be reset once the
// decoding of the entire headers are finished.
type decodeState struct {
err error // first error encountered decoding
encoding string
// statusCode caches the stream status received from the trailer
// the server sent. Client side only.
statusCode codes.Code
statusDesc string
// Server side only fields.
timeoutSet bool
timeout time.Duration
method string
// key-value metadata map from the peer.
mdata map[string][]string
}
// isReservedHeader checks whether hdr belongs to HTTP2 headers
// reserved by gRPC protocol. Any other headers are classified as the
// user-specified metadata.
func isReservedHeader(hdr string) bool {
if hdr != "" && hdr[0] == ':' {
return true
}
switch hdr {
case "content-type",
"grpc-message-type",
"grpc-encoding",
"grpc-message",
"grpc-status",
"grpc-timeout",
"te":
return true
default:
return false
}
}
// isWhitelistedPseudoHeader checks whether hdr belongs to HTTP2 pseudoheaders
// that should be propagated into metadata visible to users.
func isWhitelistedPseudoHeader(hdr string) bool {
switch hdr {
case ":authority":
return true
default:
return false
}
}
func (d *decodeState) setErr(err error) {
if d.err == nil {
d.err = err
}
}
func validContentType(t string) bool {
e := "application/grpc"
if !strings.HasPrefix(t, e) {
return false
}
// Support variations on the content-type
// (e.g. "application/grpc+blah", "application/grpc;blah").
if len(t) > len(e) && t[len(e)] != '+' && t[len(e)] != ';' {
return false
}
return true
}
func (d *decodeState) processHeaderField(f hpack.HeaderField) {
switch f.Name {
case "content-type":
if !validContentType(f.Value) {
d.setErr(streamErrorf(codes.FailedPrecondition, "transport: received the unexpected content-type %q", f.Value))
return
}
case "grpc-encoding":
d.encoding = f.Value
case "grpc-status":
code, err := strconv.Atoi(f.Value)
if err != nil {
d.setErr(streamErrorf(codes.Internal, "transport: malformed grpc-status: %v", err))
return
}
d.statusCode = codes.Code(code)
case "grpc-message":
d.statusDesc = decodeGrpcMessage(f.Value)
case "grpc-timeout":
d.timeoutSet = true
var err error
d.timeout, err = decodeTimeout(f.Value)
if err != nil {
d.setErr(streamErrorf(codes.Internal, "transport: malformed time-out: %v", err))
return
}
case ":path":
d.method = f.Value
default:
if !isReservedHeader(f.Name) || isWhitelistedPseudoHeader(f.Name) {
if f.Name == "user-agent" {
i := strings.LastIndex(f.Value, " ")
if i == -1 {
// There is no application user agent string being set.
return
}
// Extract the application user agent string.
f.Value = f.Value[:i]
}
if d.mdata == nil {
d.mdata = make(map[string][]string)
}
k, v, err := metadata.DecodeKeyValue(f.Name, f.Value)
if err != nil {
grpclog.Printf("Failed to decode (%q, %q): %v", f.Name, f.Value, err)
return
}
d.mdata[k] = append(d.mdata[k], v)
}
}
}
type timeoutUnit uint8
const (
hour timeoutUnit = 'H'
minute timeoutUnit = 'M'
second timeoutUnit = 'S'
millisecond timeoutUnit = 'm'
microsecond timeoutUnit = 'u'
nanosecond timeoutUnit = 'n'
)
func timeoutUnitToDuration(u timeoutUnit) (d time.Duration, ok bool) {
switch u {
case hour:
return time.Hour, true
case minute:
return time.Minute, true
case second:
return time.Second, true
case millisecond:
return time.Millisecond, true
case microsecond:
return time.Microsecond, true
case nanosecond:
return time.Nanosecond, true
default:
}
return
}
const maxTimeoutValue int64 = 100000000 - 1
// div does integer division and round-up the result. Note that this is
// equivalent to (d+r-1)/r but has less chance to overflow.
func div(d, r time.Duration) int64 {
if m := d % r; m > 0 {
return int64(d/r + 1)
}
return int64(d / r)
}
// TODO(zhaoq): It is the simplistic and not bandwidth efficient. Improve it.
func encodeTimeout(t time.Duration) string {
if t <= 0 {
return "0n"
}
if d := div(t, time.Nanosecond); d <= maxTimeoutValue {
return strconv.FormatInt(d, 10) + "n"
}
if d := div(t, time.Microsecond); d <= maxTimeoutValue {
return strconv.FormatInt(d, 10) + "u"
}
if d := div(t, time.Millisecond); d <= maxTimeoutValue {
return strconv.FormatInt(d, 10) + "m"
}
if d := div(t, time.Second); d <= maxTimeoutValue {
return strconv.FormatInt(d, 10) + "S"
}
if d := div(t, time.Minute); d <= maxTimeoutValue {
return strconv.FormatInt(d, 10) + "M"
}
// Note that maxTimeoutValue * time.Hour > MaxInt64.
return strconv.FormatInt(div(t, time.Hour), 10) + "H"
}
func decodeTimeout(s string) (time.Duration, error) {
size := len(s)
if size < 2 {
return 0, fmt.Errorf("transport: timeout string is too short: %q", s)
}
unit := timeoutUnit(s[size-1])
d, ok := timeoutUnitToDuration(unit)
if !ok {
return 0, fmt.Errorf("transport: timeout unit is not recognized: %q", s)
}
t, err := strconv.ParseInt(s[:size-1], 10, 64)
if err != nil {
return 0, err
}
return d * time.Duration(t), nil
}
const (
spaceByte = ' '
tildaByte = '~'
percentByte = '%'
)
// encodeGrpcMessage is used to encode status code in header field
// "grpc-message".
// It checks to see if each individual byte in msg is an
// allowable byte, and then either percent encoding or passing it through.
// When percent encoding, the byte is converted into hexadecimal notation
// with a '%' prepended.
func encodeGrpcMessage(msg string) string {
if msg == "" {
return ""
}
lenMsg := len(msg)
for i := 0; i < lenMsg; i++ {
c := msg[i]
if !(c >= spaceByte && c < tildaByte && c != percentByte) {
return encodeGrpcMessageUnchecked(msg)
}
}
return msg
}
func encodeGrpcMessageUnchecked(msg string) string {
var buf bytes.Buffer
lenMsg := len(msg)
for i := 0; i < lenMsg; i++ {
c := msg[i]
if c >= spaceByte && c < tildaByte && c != percentByte {
buf.WriteByte(c)
} else {
buf.WriteString(fmt.Sprintf("%%%02X", c))
}
}
return buf.String()
}
// decodeGrpcMessage decodes the msg encoded by encodeGrpcMessage.
func decodeGrpcMessage(msg string) string {
if msg == "" {
return ""
}
lenMsg := len(msg)
for i := 0; i < lenMsg; i++ {
if msg[i] == percentByte && i+2 < lenMsg {
return decodeGrpcMessageUnchecked(msg)
}
}
return msg
}
func decodeGrpcMessageUnchecked(msg string) string {
var buf bytes.Buffer
lenMsg := len(msg)
for i := 0; i < lenMsg; i++ {
c := msg[i]
if c == percentByte && i+2 < lenMsg {
parsed, err := strconv.ParseUint(msg[i+1:i+3], 16, 8)
if err != nil {
buf.WriteByte(c)
} else {
buf.WriteByte(byte(parsed))
i += 2
}
} else {
buf.WriteByte(c)
}
}
return buf.String()
}
type framer struct {
numWriters int32
reader io.Reader
writer *bufio.Writer
fr *http2.Framer
}
func newFramer(conn net.Conn) *framer {
f := &framer{
reader: bufio.NewReaderSize(conn, http2IOBufSize),
writer: bufio.NewWriterSize(conn, http2IOBufSize),
}
f.fr = http2.NewFramer(f.writer, f.reader)
f.fr.ReadMetaHeaders = hpack.NewDecoder(http2InitHeaderTableSize, nil)
return f
}
func (f *framer) adjustNumWriters(i int32) int32 {
return atomic.AddInt32(&f.numWriters, i)
}
// The following writeXXX functions can only be called when the caller gets
// unblocked from writableChan channel (i.e., owns the privilege to write).
func (f *framer) writeContinuation(forceFlush bool, streamID uint32, endHeaders bool, headerBlockFragment []byte) error {
if err := f.fr.WriteContinuation(streamID, endHeaders, headerBlockFragment); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeData(forceFlush bool, streamID uint32, endStream bool, data []byte) error {
if err := f.fr.WriteData(streamID, endStream, data); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeGoAway(forceFlush bool, maxStreamID uint32, code http2.ErrCode, debugData []byte) error {
if err := f.fr.WriteGoAway(maxStreamID, code, debugData); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeHeaders(forceFlush bool, p http2.HeadersFrameParam) error {
if err := f.fr.WriteHeaders(p); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writePing(forceFlush, ack bool, data [8]byte) error {
if err := f.fr.WritePing(ack, data); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writePriority(forceFlush bool, streamID uint32, p http2.PriorityParam) error {
if err := f.fr.WritePriority(streamID, p); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writePushPromise(forceFlush bool, p http2.PushPromiseParam) error {
if err := f.fr.WritePushPromise(p); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeRSTStream(forceFlush bool, streamID uint32, code http2.ErrCode) error {
if err := f.fr.WriteRSTStream(streamID, code); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeSettings(forceFlush bool, settings ...http2.Setting) error {
if err := f.fr.WriteSettings(settings...); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeSettingsAck(forceFlush bool) error {
if err := f.fr.WriteSettingsAck(); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) writeWindowUpdate(forceFlush bool, streamID, incr uint32) error {
if err := f.fr.WriteWindowUpdate(streamID, incr); err != nil {
return err
}
if forceFlush {
return f.writer.Flush()
}
return nil
}
func (f *framer) flushWrite() error {
return f.writer.Flush()
}
func (f *framer) readFrame() (http2.Frame, error) {
return f.fr.ReadFrame()
}
func (f *framer) errorDetail() error {
return f.fr.ErrorDetail()
}

51
vendor/google.golang.org/grpc/transport/pre_go16.go generated vendored Normal file
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@ -0,0 +1,51 @@
// +build !go1.6
/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package transport
import (
"net"
"time"
"golang.org/x/net/context"
)
// dialContext connects to the address on the named network.
func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
var dialer net.Dialer
if deadline, ok := ctx.Deadline(); ok {
dialer.Timeout = deadline.Sub(time.Now())
}
return dialer.Dial(network, address)
}

604
vendor/google.golang.org/grpc/transport/transport.go generated vendored Normal file
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@ -0,0 +1,604 @@
/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
Package transport defines and implements message oriented communication channel
to complete various transactions (e.g., an RPC).
*/
package transport // import "google.golang.org/grpc/transport"
import (
"bytes"
"fmt"
"io"
"net"
"sync"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/tap"
)
// recvMsg represents the received msg from the transport. All transport
// protocol specific info has been removed.
type recvMsg struct {
data []byte
// nil: received some data
// io.EOF: stream is completed. data is nil.
// other non-nil error: transport failure. data is nil.
err error
}
func (*recvMsg) item() {}
// All items in an out of a recvBuffer should be the same type.
type item interface {
item()
}
// recvBuffer is an unbounded channel of item.
type recvBuffer struct {
c chan item
mu sync.Mutex
backlog []item
}
func newRecvBuffer() *recvBuffer {
b := &recvBuffer{
c: make(chan item, 1),
}
return b
}
func (b *recvBuffer) put(r item) {
b.mu.Lock()
defer b.mu.Unlock()
if len(b.backlog) == 0 {
select {
case b.c <- r:
return
default:
}
}
b.backlog = append(b.backlog, r)
}
func (b *recvBuffer) load() {
b.mu.Lock()
defer b.mu.Unlock()
if len(b.backlog) > 0 {
select {
case b.c <- b.backlog[0]:
b.backlog = b.backlog[1:]
default:
}
}
}
// get returns the channel that receives an item in the buffer.
//
// Upon receipt of an item, the caller should call load to send another
// item onto the channel if there is any.
func (b *recvBuffer) get() <-chan item {
return b.c
}
// recvBufferReader implements io.Reader interface to read the data from
// recvBuffer.
type recvBufferReader struct {
ctx context.Context
goAway chan struct{}
recv *recvBuffer
last *bytes.Reader // Stores the remaining data in the previous calls.
err error
}
// Read reads the next len(p) bytes from last. If last is drained, it tries to
// read additional data from recv. It blocks if there no additional data available
// in recv. If Read returns any non-nil error, it will continue to return that error.
func (r *recvBufferReader) Read(p []byte) (n int, err error) {
if r.err != nil {
return 0, r.err
}
defer func() { r.err = err }()
if r.last != nil && r.last.Len() > 0 {
// Read remaining data left in last call.
return r.last.Read(p)
}
select {
case <-r.ctx.Done():
return 0, ContextErr(r.ctx.Err())
case <-r.goAway:
return 0, ErrStreamDrain
case i := <-r.recv.get():
r.recv.load()
m := i.(*recvMsg)
if m.err != nil {
return 0, m.err
}
r.last = bytes.NewReader(m.data)
return r.last.Read(p)
}
}
type streamState uint8
const (
streamActive streamState = iota
streamWriteDone // EndStream sent
streamReadDone // EndStream received
streamDone // the entire stream is finished.
)
// Stream represents an RPC in the transport layer.
type Stream struct {
id uint32
// nil for client side Stream.
st ServerTransport
// clientStatsCtx keeps the user context for stats handling.
// It's only valid on client side. Server side stats context is same as s.ctx.
// All client side stats collection should use the clientStatsCtx (instead of the stream context)
// so that all the generated stats for a particular RPC can be associated in the processing phase.
clientStatsCtx context.Context
// ctx is the associated context of the stream.
ctx context.Context
// cancel is always nil for client side Stream.
cancel context.CancelFunc
// done is closed when the final status arrives.
done chan struct{}
// goAway is closed when the server sent GoAways signal before this stream was initiated.
goAway chan struct{}
// method records the associated RPC method of the stream.
method string
recvCompress string
sendCompress string
buf *recvBuffer
dec io.Reader
fc *inFlow
recvQuota uint32
// The accumulated inbound quota pending for window update.
updateQuota uint32
// The handler to control the window update procedure for both this
// particular stream and the associated transport.
windowHandler func(int)
sendQuotaPool *quotaPool
// Close headerChan to indicate the end of reception of header metadata.
headerChan chan struct{}
// header caches the received header metadata.
header metadata.MD
// The key-value map of trailer metadata.
trailer metadata.MD
mu sync.RWMutex // guard the following
// headerOK becomes true from the first header is about to send.
headerOk bool
state streamState
// true iff headerChan is closed. Used to avoid closing headerChan
// multiple times.
headerDone bool
// the status received from the server.
statusCode codes.Code
statusDesc string
}
// RecvCompress returns the compression algorithm applied to the inbound
// message. It is empty string if there is no compression applied.
func (s *Stream) RecvCompress() string {
return s.recvCompress
}
// SetSendCompress sets the compression algorithm to the stream.
func (s *Stream) SetSendCompress(str string) {
s.sendCompress = str
}
// Done returns a chanel which is closed when it receives the final status
// from the server.
func (s *Stream) Done() <-chan struct{} {
return s.done
}
// GoAway returns a channel which is closed when the server sent GoAways signal
// before this stream was initiated.
func (s *Stream) GoAway() <-chan struct{} {
return s.goAway
}
// Header acquires the key-value pairs of header metadata once it
// is available. It blocks until i) the metadata is ready or ii) there is no
// header metadata or iii) the stream is cancelled/expired.
func (s *Stream) Header() (metadata.MD, error) {
select {
case <-s.ctx.Done():
return nil, ContextErr(s.ctx.Err())
case <-s.goAway:
return nil, ErrStreamDrain
case <-s.headerChan:
return s.header.Copy(), nil
}
}
// Trailer returns the cached trailer metedata. Note that if it is not called
// after the entire stream is done, it could return an empty MD. Client
// side only.
func (s *Stream) Trailer() metadata.MD {
s.mu.RLock()
defer s.mu.RUnlock()
return s.trailer.Copy()
}
// ServerTransport returns the underlying ServerTransport for the stream.
// The client side stream always returns nil.
func (s *Stream) ServerTransport() ServerTransport {
return s.st
}
// Context returns the context of the stream.
func (s *Stream) Context() context.Context {
return s.ctx
}
// Method returns the method for the stream.
func (s *Stream) Method() string {
return s.method
}
// StatusCode returns statusCode received from the server.
func (s *Stream) StatusCode() codes.Code {
return s.statusCode
}
// StatusDesc returns statusDesc received from the server.
func (s *Stream) StatusDesc() string {
return s.statusDesc
}
// SetHeader sets the header metadata. This can be called multiple times.
// Server side only.
func (s *Stream) SetHeader(md metadata.MD) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.headerOk || s.state == streamDone {
return ErrIllegalHeaderWrite
}
if md.Len() == 0 {
return nil
}
s.header = metadata.Join(s.header, md)
return nil
}
// SetTrailer sets the trailer metadata which will be sent with the RPC status
// by the server. This can be called multiple times. Server side only.
func (s *Stream) SetTrailer(md metadata.MD) error {
if md.Len() == 0 {
return nil
}
s.mu.Lock()
defer s.mu.Unlock()
s.trailer = metadata.Join(s.trailer, md)
return nil
}
func (s *Stream) write(m recvMsg) {
s.buf.put(&m)
}
// Read reads all the data available for this Stream from the transport and
// passes them into the decoder, which converts them into a gRPC message stream.
// The error is io.EOF when the stream is done or another non-nil error if
// the stream broke.
func (s *Stream) Read(p []byte) (n int, err error) {
n, err = s.dec.Read(p)
if err != nil {
return
}
s.windowHandler(n)
return
}
// The key to save transport.Stream in the context.
type streamKey struct{}
// newContextWithStream creates a new context from ctx and attaches stream
// to it.
func newContextWithStream(ctx context.Context, stream *Stream) context.Context {
return context.WithValue(ctx, streamKey{}, stream)
}
// StreamFromContext returns the stream saved in ctx.
func StreamFromContext(ctx context.Context) (s *Stream, ok bool) {
s, ok = ctx.Value(streamKey{}).(*Stream)
return
}
// state of transport
type transportState int
const (
reachable transportState = iota
unreachable
closing
draining
)
// ServerConfig consists of all the configurations to establish a server transport.
type ServerConfig struct {
MaxStreams uint32
AuthInfo credentials.AuthInfo
InTapHandle tap.ServerInHandle
}
// NewServerTransport creates a ServerTransport with conn or non-nil error
// if it fails.
func NewServerTransport(protocol string, conn net.Conn, config *ServerConfig) (ServerTransport, error) {
return newHTTP2Server(conn, config)
}
// ConnectOptions covers all relevant options for communicating with the server.
type ConnectOptions struct {
// UserAgent is the application user agent.
UserAgent string
// Dialer specifies how to dial a network address.
Dialer func(context.Context, string) (net.Conn, error)
// FailOnNonTempDialError specifies if gRPC fails on non-temporary dial errors.
FailOnNonTempDialError bool
// PerRPCCredentials stores the PerRPCCredentials required to issue RPCs.
PerRPCCredentials []credentials.PerRPCCredentials
// TransportCredentials stores the Authenticator required to setup a client connection.
TransportCredentials credentials.TransportCredentials
}
// TargetInfo contains the information of the target such as network address and metadata.
type TargetInfo struct {
Addr string
Metadata interface{}
}
// NewClientTransport establishes the transport with the required ConnectOptions
// and returns it to the caller.
func NewClientTransport(ctx context.Context, target TargetInfo, opts ConnectOptions) (ClientTransport, error) {
return newHTTP2Client(ctx, target, opts)
}
// Options provides additional hints and information for message
// transmission.
type Options struct {
// Last indicates whether this write is the last piece for
// this stream.
Last bool
// Delay is a hint to the transport implementation for whether
// the data could be buffered for a batching write. The
// Transport implementation may ignore the hint.
Delay bool
}
// CallHdr carries the information of a particular RPC.
type CallHdr struct {
// Host specifies the peer's host.
Host string
// Method specifies the operation to perform.
Method string
// RecvCompress specifies the compression algorithm applied on
// inbound messages.
RecvCompress string
// SendCompress specifies the compression algorithm applied on
// outbound message.
SendCompress string
// Flush indicates whether a new stream command should be sent
// to the peer without waiting for the first data. This is
// only a hint. The transport may modify the flush decision
// for performance purposes.
Flush bool
}
// ClientTransport is the common interface for all gRPC client-side transport
// implementations.
type ClientTransport interface {
// Close tears down this transport. Once it returns, the transport
// should not be accessed any more. The caller must make sure this
// is called only once.
Close() error
// GracefulClose starts to tear down the transport. It stops accepting
// new RPCs and wait the completion of the pending RPCs.
GracefulClose() error
// Write sends the data for the given stream. A nil stream indicates
// the write is to be performed on the transport as a whole.
Write(s *Stream, data []byte, opts *Options) error
// NewStream creates a Stream for an RPC.
NewStream(ctx context.Context, callHdr *CallHdr) (*Stream, error)
// CloseStream clears the footprint of a stream when the stream is
// not needed any more. The err indicates the error incurred when
// CloseStream is called. Must be called when a stream is finished
// unless the associated transport is closing.
CloseStream(stream *Stream, err error)
// Error returns a channel that is closed when some I/O error
// happens. Typically the caller should have a goroutine to monitor
// this in order to take action (e.g., close the current transport
// and create a new one) in error case. It should not return nil
// once the transport is initiated.
Error() <-chan struct{}
// GoAway returns a channel that is closed when ClientTranspor
// receives the draining signal from the server (e.g., GOAWAY frame in
// HTTP/2).
GoAway() <-chan struct{}
}
// ServerTransport is the common interface for all gRPC server-side transport
// implementations.
//
// Methods may be called concurrently from multiple goroutines, but
// Write methods for a given Stream will be called serially.
type ServerTransport interface {
// HandleStreams receives incoming streams using the given handler.
HandleStreams(func(*Stream), func(context.Context, string) context.Context)
// WriteHeader sends the header metadata for the given stream.
// WriteHeader may not be called on all streams.
WriteHeader(s *Stream, md metadata.MD) error
// Write sends the data for the given stream.
// Write may not be called on all streams.
Write(s *Stream, data []byte, opts *Options) error
// WriteStatus sends the status of a stream to the client.
// WriteStatus is the final call made on a stream and always
// occurs.
WriteStatus(s *Stream, statusCode codes.Code, statusDesc string) error
// Close tears down the transport. Once it is called, the transport
// should not be accessed any more. All the pending streams and their
// handlers will be terminated asynchronously.
Close() error
// RemoteAddr returns the remote network address.
RemoteAddr() net.Addr
// Drain notifies the client this ServerTransport stops accepting new RPCs.
Drain()
}
// streamErrorf creates an StreamError with the specified error code and description.
func streamErrorf(c codes.Code, format string, a ...interface{}) StreamError {
return StreamError{
Code: c,
Desc: fmt.Sprintf(format, a...),
}
}
// connectionErrorf creates an ConnectionError with the specified error description.
func connectionErrorf(temp bool, e error, format string, a ...interface{}) ConnectionError {
return ConnectionError{
Desc: fmt.Sprintf(format, a...),
temp: temp,
err: e,
}
}
// ConnectionError is an error that results in the termination of the
// entire connection and the retry of all the active streams.
type ConnectionError struct {
Desc string
temp bool
err error
}
func (e ConnectionError) Error() string {
return fmt.Sprintf("connection error: desc = %q", e.Desc)
}
// Temporary indicates if this connection error is temporary or fatal.
func (e ConnectionError) Temporary() bool {
return e.temp
}
// Origin returns the original error of this connection error.
func (e ConnectionError) Origin() error {
// Never return nil error here.
// If the original error is nil, return itself.
if e.err == nil {
return e
}
return e.err
}
var (
// ErrConnClosing indicates that the transport is closing.
ErrConnClosing = connectionErrorf(true, nil, "transport is closing")
// ErrStreamDrain indicates that the stream is rejected by the server because
// the server stops accepting new RPCs.
ErrStreamDrain = streamErrorf(codes.Unavailable, "the server stops accepting new RPCs")
)
// StreamError is an error that only affects one stream within a connection.
type StreamError struct {
Code codes.Code
Desc string
}
func (e StreamError) Error() string {
return fmt.Sprintf("stream error: code = %d desc = %q", e.Code, e.Desc)
}
// ContextErr converts the error from context package into a StreamError.
func ContextErr(err error) StreamError {
switch err {
case context.DeadlineExceeded:
return streamErrorf(codes.DeadlineExceeded, "%v", err)
case context.Canceled:
return streamErrorf(codes.Canceled, "%v", err)
}
panic(fmt.Sprintf("Unexpected error from context packet: %v", err))
}
// wait blocks until it can receive from ctx.Done, closing, or proceed.
// If it receives from ctx.Done, it returns 0, the StreamError for ctx.Err.
// If it receives from done, it returns 0, io.EOF if ctx is not done; otherwise
// it return the StreamError for ctx.Err.
// If it receives from goAway, it returns 0, ErrStreamDrain.
// If it receives from closing, it returns 0, ErrConnClosing.
// If it receives from proceed, it returns the received integer, nil.
func wait(ctx context.Context, done, goAway, closing <-chan struct{}, proceed <-chan int) (int, error) {
select {
case <-ctx.Done():
return 0, ContextErr(ctx.Err())
case <-done:
// User cancellation has precedence.
select {
case <-ctx.Done():
return 0, ContextErr(ctx.Err())
default:
}
return 0, io.EOF
case <-goAway:
return 0, ErrStreamDrain
case <-closing:
return 0, ErrConnClosing
case i := <-proceed:
return i, nil
}
}