290 lines
7.8 KiB
Go
290 lines
7.8 KiB
Go
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/*
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* Copyright 2016, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package grpc_test
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import (
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"bytes"
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"errors"
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"io"
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"strings"
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"testing"
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"time"
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"golang.org/x/net/http2"
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"golang.org/x/net/http2/hpack"
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)
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// This is a subset of http2's serverTester type.
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//
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// serverTester wraps a io.ReadWriter (acting like the underlying
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// network connection) and provides utility methods to read and write
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// http2 frames.
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//
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// NOTE(bradfitz): this could eventually be exported somewhere. Others
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// have asked for it too. For now I'm still experimenting with the
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// API and don't feel like maintaining a stable testing API.
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type serverTester struct {
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cc io.ReadWriteCloser // client conn
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t testing.TB
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fr *http2.Framer
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// writing headers:
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headerBuf bytes.Buffer
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hpackEnc *hpack.Encoder
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// reading frames:
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frc chan http2.Frame
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frErrc chan error
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readTimer *time.Timer
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}
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func newServerTesterFromConn(t testing.TB, cc io.ReadWriteCloser) *serverTester {
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st := &serverTester{
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t: t,
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cc: cc,
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frc: make(chan http2.Frame, 1),
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frErrc: make(chan error, 1),
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}
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st.hpackEnc = hpack.NewEncoder(&st.headerBuf)
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st.fr = http2.NewFramer(cc, cc)
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st.fr.ReadMetaHeaders = hpack.NewDecoder(4096 /*initialHeaderTableSize*/, nil)
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return st
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}
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func (st *serverTester) readFrame() (http2.Frame, error) {
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go func() {
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fr, err := st.fr.ReadFrame()
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if err != nil {
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st.frErrc <- err
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} else {
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st.frc <- fr
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}
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}()
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t := time.NewTimer(2 * time.Second)
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defer t.Stop()
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select {
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case f := <-st.frc:
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return f, nil
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case err := <-st.frErrc:
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return nil, err
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case <-t.C:
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return nil, errors.New("timeout waiting for frame")
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}
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}
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// greet initiates the client's HTTP/2 connection into a state where
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// frames may be sent.
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func (st *serverTester) greet() {
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st.writePreface()
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st.writeInitialSettings()
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st.wantSettings()
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st.writeSettingsAck()
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for {
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f, err := st.readFrame()
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if err != nil {
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st.t.Fatal(err)
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}
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switch f := f.(type) {
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case *http2.WindowUpdateFrame:
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// grpc's transport/http2_server sends this
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// before the settings ack. The Go http2
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// server uses a setting instead.
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case *http2.SettingsFrame:
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if f.IsAck() {
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return
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}
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st.t.Fatalf("during greet, got non-ACK settings frame")
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default:
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st.t.Fatalf("during greet, unexpected frame type %T", f)
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}
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}
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}
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func (st *serverTester) writePreface() {
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n, err := st.cc.Write([]byte(http2.ClientPreface))
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if err != nil {
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st.t.Fatalf("Error writing client preface: %v", err)
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}
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if n != len(http2.ClientPreface) {
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st.t.Fatalf("Writing client preface, wrote %d bytes; want %d", n, len(http2.ClientPreface))
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}
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}
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func (st *serverTester) writeInitialSettings() {
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if err := st.fr.WriteSettings(); err != nil {
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st.t.Fatalf("Error writing initial SETTINGS frame from client to server: %v", err)
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}
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}
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func (st *serverTester) writeSettingsAck() {
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if err := st.fr.WriteSettingsAck(); err != nil {
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st.t.Fatalf("Error writing ACK of server's SETTINGS: %v", err)
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}
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}
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func (st *serverTester) wantSettings() *http2.SettingsFrame {
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f, err := st.readFrame()
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if err != nil {
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st.t.Fatalf("Error while expecting a SETTINGS frame: %v", err)
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}
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sf, ok := f.(*http2.SettingsFrame)
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if !ok {
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st.t.Fatalf("got a %T; want *SettingsFrame", f)
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}
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return sf
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}
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func (st *serverTester) wantSettingsAck() {
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f, err := st.readFrame()
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if err != nil {
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st.t.Fatal(err)
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}
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sf, ok := f.(*http2.SettingsFrame)
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if !ok {
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st.t.Fatalf("Wanting a settings ACK, received a %T", f)
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}
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if !sf.IsAck() {
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st.t.Fatal("Settings Frame didn't have ACK set")
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}
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}
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// wait for any activity from the server
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func (st *serverTester) wantAnyFrame() http2.Frame {
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f, err := st.fr.ReadFrame()
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if err != nil {
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st.t.Fatal(err)
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}
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return f
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}
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func (st *serverTester) encodeHeaderField(k, v string) {
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err := st.hpackEnc.WriteField(hpack.HeaderField{Name: k, Value: v})
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if err != nil {
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st.t.Fatalf("HPACK encoding error for %q/%q: %v", k, v, err)
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}
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}
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// encodeHeader encodes headers and returns their HPACK bytes. headers
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// must contain an even number of key/value pairs. There may be
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// multiple pairs for keys (e.g. "cookie"). The :method, :path, and
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// :scheme headers default to GET, / and https.
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func (st *serverTester) encodeHeader(headers ...string) []byte {
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if len(headers)%2 == 1 {
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panic("odd number of kv args")
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}
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st.headerBuf.Reset()
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if len(headers) == 0 {
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// Fast path, mostly for benchmarks, so test code doesn't pollute
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// profiles when we're looking to improve server allocations.
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st.encodeHeaderField(":method", "GET")
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st.encodeHeaderField(":path", "/")
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st.encodeHeaderField(":scheme", "https")
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return st.headerBuf.Bytes()
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}
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if len(headers) == 2 && headers[0] == ":method" {
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// Another fast path for benchmarks.
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st.encodeHeaderField(":method", headers[1])
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st.encodeHeaderField(":path", "/")
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st.encodeHeaderField(":scheme", "https")
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return st.headerBuf.Bytes()
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}
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pseudoCount := map[string]int{}
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keys := []string{":method", ":path", ":scheme"}
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vals := map[string][]string{
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":method": {"GET"},
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":path": {"/"},
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":scheme": {"https"},
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}
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for len(headers) > 0 {
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k, v := headers[0], headers[1]
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headers = headers[2:]
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if _, ok := vals[k]; !ok {
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keys = append(keys, k)
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}
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if strings.HasPrefix(k, ":") {
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pseudoCount[k]++
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if pseudoCount[k] == 1 {
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vals[k] = []string{v}
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} else {
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// Allows testing of invalid headers w/ dup pseudo fields.
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vals[k] = append(vals[k], v)
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}
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} else {
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vals[k] = append(vals[k], v)
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}
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}
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for _, k := range keys {
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for _, v := range vals[k] {
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st.encodeHeaderField(k, v)
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}
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}
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return st.headerBuf.Bytes()
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}
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func (st *serverTester) writeHeadersGRPC(streamID uint32, path string) {
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st.writeHeaders(http2.HeadersFrameParam{
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StreamID: streamID,
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BlockFragment: st.encodeHeader(
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":method", "POST",
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":path", path,
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"content-type", "application/grpc",
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"te", "trailers",
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),
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EndStream: false,
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EndHeaders: true,
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})
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}
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func (st *serverTester) writeHeaders(p http2.HeadersFrameParam) {
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if err := st.fr.WriteHeaders(p); err != nil {
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st.t.Fatalf("Error writing HEADERS: %v", err)
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}
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}
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func (st *serverTester) writeData(streamID uint32, endStream bool, data []byte) {
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if err := st.fr.WriteData(streamID, endStream, data); err != nil {
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st.t.Fatalf("Error writing DATA: %v", err)
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}
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}
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func (st *serverTester) writeRSTStream(streamID uint32, code http2.ErrCode) {
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if err := st.fr.WriteRSTStream(streamID, code); err != nil {
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st.t.Fatalf("Error writing RST_STREAM: %v", err)
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}
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}
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