beam/examples/beamsh: move builtins to a separate file for readability

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
This commit is contained in:
Solomon Hykes 2014-04-02 19:18:00 -07:00
parent 4a8dc511e2
commit 1dbb699e6a
2 changed files with 402 additions and 349 deletions

View file

@ -11,11 +11,9 @@ import (
"net" "net"
"net/url" "net/url"
"os" "os"
"os/exec"
"path" "path"
"strings" "strings"
"sync" "sync"
"text/template"
"flag" "flag"
) )
@ -252,370 +250,41 @@ func Handlers() (*beam.UnixConn, error) {
func GetHandler(name string) Handler { func GetHandler(name string) Handler {
if name == "logger" { if name == "logger" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdLogger
if err := os.MkdirAll("logs", 0700); err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
var tasks sync.WaitGroup
defer tasks.Wait()
var n int = 1
r := beam.NewRouter(out)
r.NewRoute().HasAttachment().KeyStartsWith("cmd", "log").Handler(func (payload []byte, attachment *os.File) error {
tasks.Add(1)
go func(n int) {
defer tasks.Done()
defer attachment.Close()
var streamname string
if cmd := data.Message(payload).Get("cmd"); len(cmd) == 1 || cmd[1] == "stdout" {
streamname = "stdout"
} else {
streamname = cmd[1]
}
if fromcmd := data.Message(payload).Get("fromcmd"); len(fromcmd) != 0 {
streamname = fmt.Sprintf("%s-%s", strings.Replace(strings.Join(fromcmd, "_"), "/", "_", -1), streamname)
}
logfile, err := os.OpenFile(path.Join("logs", fmt.Sprintf("%d-%s", n, streamname)), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0700)
if err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
defer logfile.Close()
io.Copy(logfile, attachment)
logfile.Sync()
}(n)
n++
return nil
}).Tee(out)
if _, err := beam.Copy(r, in); err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
}
} else if name == "render" { } else if name == "render" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdRender
if len(args) != 2 {
fmt.Fprintf(stderr, "Usage: %s FORMAT\n", args[0])
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
txt := args[1]
if !strings.HasSuffix(txt, "\n") {
txt += "\n"
}
t := template.Must(template.New("render").Parse(txt))
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
msg, err := data.Decode(string(payload))
if err != nil {
fmt.Fprintf(stderr, "decode error: %v\n")
}
if err := t.Execute(stdout, msg); err != nil {
fmt.Fprintf(stderr, "rendering error: %v\n", err)
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
if err := out.Send(payload, attachment); err != nil {
return
}
}
}
} else if name == "devnull" { } else if name == "devnull" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdDevnull
for {
_, attachment, err := in.Receive()
if err != nil {
return
}
if attachment != nil {
attachment.Close()
}
}
}
} else if name == "prompt" { } else if name == "prompt" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdPrompt
if len(args) < 2 {
fmt.Fprintf(stderr, "usage: %s PROMPT...\n", args[0])
return
}
if !term.IsTerminal(0) {
fmt.Fprintf(stderr, "can't prompt: no tty available...\n")
return
}
fmt.Printf("%s: ", strings.Join(args[1:], " "))
oldState, _ := term.SaveState(0)
term.DisableEcho(0, oldState)
line, _, err := bufio.NewReader(os.Stdin).ReadLine()
if err != nil {
fmt.Fprintln(stderr, err.Error())
return
}
val := string(line)
fmt.Printf("\n")
term.RestoreTerminal(0, oldState)
out.Send(data.Empty().Set("fromcmd", args...).Set("value", val).Bytes(), nil)
}
} else if name == "stdio" { } else if name == "stdio" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdStdio
var tasks sync.WaitGroup
defer tasks.Wait()
r := beam.NewRouter(out)
r.NewRoute().HasAttachment().KeyStartsWith("cmd", "log").Handler(func(payload []byte, attachment *os.File) error {
tasks.Add(1)
go func() {
defer tasks.Done()
defer attachment.Close()
io.Copy(os.Stdout, attachment)
attachment.Close()
}()
return nil
}).Tee(out)
if _, err := beam.Copy(r, in); err != nil {
Fatal(err)
fmt.Fprintf(stderr, "%v\n", err)
return
}
}
} else if name == "echo" { } else if name == "echo" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdEcho
fmt.Fprintln(stdout, strings.Join(args[1:], " "))
}
} else if name == "pass" { } else if name == "pass" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdPass
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
if err := out.Send(payload, attachment); err != nil {
if attachment != nil {
attachment.Close()
}
return
}
}
}
} else if name == "in" { } else if name == "in" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdIn
os.Chdir(args[1])
GetHandler("pass")([]string{"pass"}, stdout, stderr, in, out)
}
} else if name == "exec" { } else if name == "exec" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdExec
cmd := exec.Command(args[1], args[2:]...)
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Stdin = os.Stdin
execErr := cmd.Run()
var status string
if execErr != nil {
status = execErr.Error()
} else {
status = "ok"
}
out.Send(data.Empty().Set("status", status).Set("cmd", args...).Bytes(), nil)
}
} else if name == "trace" { } else if name == "trace" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdTrace
for {
p, a, err := in.Receive()
if err != nil {
return
}
var msg string
if pretty := data.Message(string(p)).Pretty(); pretty != "" {
msg = pretty
} else {
msg = string(p)
}
if a != nil {
msg = fmt.Sprintf("%s [%d]", msg, a.Fd())
}
fmt.Printf("===> %s\n", msg)
out.Send(p, a)
}
}
} else if name == "emit" { } else if name == "emit" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdEmit
out.Send(data.Parse(args[1:]).Bytes(), nil)
}
} else if name == "print" { } else if name == "print" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdPrint
for {
payload, a, err := in.Receive()
if err != nil {
return
}
// Skip commands
if a != nil && data.Message(payload).Get("cmd") == nil {
dup, err := beam.SendPipe(out, payload)
if err != nil {
a.Close()
return
}
io.Copy(io.MultiWriter(os.Stdout, dup), a)
dup.Close()
} else {
if err := out.Send(payload, a); err != nil {
return
}
}
}
}
} else if name == "multiprint" { } else if name == "multiprint" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdMultiprint
var tasks sync.WaitGroup
for {
payload, a, err := in.Receive()
if err != nil {
return
}
if a != nil {
tasks.Add(1)
go func(payload []byte, attachment *os.File) {
defer tasks.Done()
msg := data.Message(string(payload))
input := bufio.NewScanner(attachment)
for input.Scan() {
fmt.Printf("[%s] %s\n", msg.Pretty(), input.Text())
}
}(payload, a)
}
}
tasks.Wait()
}
} else if name == "listen" { } else if name == "listen" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdListen
if len(args) != 2 {
out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
return
}
u, err := url.Parse(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
l, err := net.Listen(u.Scheme, u.Host)
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
for {
conn, err := l.Accept()
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
f, err := connToFile(conn)
if err != nil {
conn.Close()
continue
}
out.Send(data.Empty().Set("type", "socket").Set("remoteaddr", conn.RemoteAddr().String()).Bytes(), f)
}
}
} else if name == "beamsend" { } else if name == "beamsend" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdBeamsend
if len(args) < 2 {
if err := out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil); err != nil {
Fatal(err)
}
return
}
var connector func(string) (chan net.Conn, error)
connector = dialer
connections, err := connector(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
// Copy in to conn
SendToConn(connections, in)
}
} else if name == "beamreceive" { } else if name == "beamreceive" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdBeamreceive
if len(args) != 2 {
if err := out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil); err != nil {
Fatal(err)
}
return
}
var connector func(string) (chan net.Conn, error)
connector = listener
connections, err := connector(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
// Copy in to conn
ReceiveFromConn(connections, out)
}
} else if name == "connect" { } else if name == "connect" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdConnect
if len(args) != 2 {
out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
return
}
u, err := url.Parse(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
var tasks sync.WaitGroup
for {
_, attachment, err := in.Receive()
if err != nil {
break
}
if attachment == nil {
continue
}
Logf("connecting to %s/%s\n", u.Scheme, u.Host)
conn, err := net.Dial(u.Scheme, u.Host)
if err != nil {
out.Send(data.Empty().Set("cmd", "msg", "connect error: " + err.Error()).Bytes(), nil)
return
}
out.Send(data.Empty().Set("cmd", "msg", "connection established").Bytes(), nil)
tasks.Add(1)
go func(attachment *os.File, conn net.Conn) {
defer tasks.Done()
// even when successful, conn.File() returns a duplicate,
// so we must close the original
var iotasks sync.WaitGroup
iotasks.Add(2)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(attachment, conn)
}(attachment, conn)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(conn, attachment)
}(attachment, conn)
iotasks.Wait()
conn.Close()
attachment.Close()
}(attachment, conn)
}
tasks.Wait()
}
} else if name == "openfile" { } else if name == "openfile" {
return func(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) { return CmdOpenfile
for _, name := range args {
f, err := os.Open(name)
if err != nil {
continue
}
if err := out.Send(data.Empty().Set("path", name).Set("type", "file").Bytes(), f); err != nil {
f.Close()
}
}
}
} }
return nil return nil
} }

View file

@ -0,0 +1,384 @@
package main
import (
"io"
"os/exec"
"github.com/dotcloud/docker/pkg/beam"
"github.com/dotcloud/docker/pkg/beam/data"
"github.com/dotcloud/docker/pkg/term"
"text/template"
"fmt"
"sync"
"os"
"strings"
"path"
"bufio"
"net"
"net/url"
)
func CmdLogger(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if err := os.MkdirAll("logs", 0700); err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
var tasks sync.WaitGroup
defer tasks.Wait()
var n int = 1
r := beam.NewRouter(out)
r.NewRoute().HasAttachment().KeyStartsWith("cmd", "log").Handler(func (payload []byte, attachment *os.File) error {
tasks.Add(1)
go func(n int) {
defer tasks.Done()
defer attachment.Close()
var streamname string
if cmd := data.Message(payload).Get("cmd"); len(cmd) == 1 || cmd[1] == "stdout" {
streamname = "stdout"
} else {
streamname = cmd[1]
}
if fromcmd := data.Message(payload).Get("fromcmd"); len(fromcmd) != 0 {
streamname = fmt.Sprintf("%s-%s", strings.Replace(strings.Join(fromcmd, "_"), "/", "_", -1), streamname)
}
logfile, err := os.OpenFile(path.Join("logs", fmt.Sprintf("%d-%s", n, streamname)), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0700)
if err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
defer logfile.Close()
io.Copy(logfile, attachment)
logfile.Sync()
}(n)
n++
return nil
}).Tee(out)
if _, err := beam.Copy(r, in); err != nil {
fmt.Fprintf(stderr, "%v\n", err)
return
}
}
func CmdRender(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
fmt.Fprintf(stderr, "Usage: %s FORMAT\n", args[0])
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
txt := args[1]
if !strings.HasSuffix(txt, "\n") {
txt += "\n"
}
t := template.Must(template.New("render").Parse(txt))
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
msg, err := data.Decode(string(payload))
if err != nil {
fmt.Fprintf(stderr, "decode error: %v\n")
}
if err := t.Execute(stdout, msg); err != nil {
fmt.Fprintf(stderr, "rendering error: %v\n", err)
out.Send(data.Empty().Set("status", "1").Bytes(), nil)
return
}
if err := out.Send(payload, attachment); err != nil {
return
}
}
}
func CmdDevnull(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
_, attachment, err := in.Receive()
if err != nil {
return
}
if attachment != nil {
attachment.Close()
}
}
}
func CmdPrompt(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) < 2 {
fmt.Fprintf(stderr, "usage: %s PROMPT...\n", args[0])
return
}
if !term.IsTerminal(0) {
fmt.Fprintf(stderr, "can't prompt: no tty available...\n")
return
}
fmt.Printf("%s: ", strings.Join(args[1:], " "))
oldState, _ := term.SaveState(0)
term.DisableEcho(0, oldState)
line, _, err := bufio.NewReader(os.Stdin).ReadLine()
if err != nil {
fmt.Fprintln(stderr, err.Error())
return
}
val := string(line)
fmt.Printf("\n")
term.RestoreTerminal(0, oldState)
out.Send(data.Empty().Set("fromcmd", args...).Set("value", val).Bytes(), nil)
}
func CmdStdio(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
var tasks sync.WaitGroup
defer tasks.Wait()
r := beam.NewRouter(out)
r.NewRoute().HasAttachment().KeyStartsWith("cmd", "log").Handler(func(payload []byte, attachment *os.File) error {
tasks.Add(1)
go func() {
defer tasks.Done()
defer attachment.Close()
io.Copy(os.Stdout, attachment)
attachment.Close()
}()
return nil
}).Tee(out)
if _, err := beam.Copy(r, in); err != nil {
Fatal(err)
fmt.Fprintf(stderr, "%v\n", err)
return
}
}
func CmdEcho(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
fmt.Fprintln(stdout, strings.Join(args[1:], " "))
}
func CmdPass(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
payload, attachment, err := in.Receive()
if err != nil {
return
}
if err := out.Send(payload, attachment); err != nil {
if attachment != nil {
attachment.Close()
}
return
}
}
}
func CmdIn(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
os.Chdir(args[1])
GetHandler("pass")([]string{"pass"}, stdout, stderr, in, out)
}
func CmdExec(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
cmd := exec.Command(args[1], args[2:]...)
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Stdin = os.Stdin
execErr := cmd.Run()
var status string
if execErr != nil {
status = execErr.Error()
} else {
status = "ok"
}
out.Send(data.Empty().Set("status", status).Set("cmd", args...).Bytes(), nil)
}
func CmdTrace(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
p, a, err := in.Receive()
if err != nil {
return
}
var msg string
if pretty := data.Message(string(p)).Pretty(); pretty != "" {
msg = pretty
} else {
msg = string(p)
}
if a != nil {
msg = fmt.Sprintf("%s [%d]", msg, a.Fd())
}
fmt.Printf("===> %s\n", msg)
out.Send(p, a)
}
}
func CmdEmit(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
out.Send(data.Parse(args[1:]).Bytes(), nil)
}
func CmdPrint(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for {
payload, a, err := in.Receive()
if err != nil {
return
}
// Skip commands
if a != nil && data.Message(payload).Get("cmd") == nil {
dup, err := beam.SendPipe(out, payload)
if err != nil {
a.Close()
return
}
io.Copy(io.MultiWriter(os.Stdout, dup), a)
dup.Close()
} else {
if err := out.Send(payload, a); err != nil {
return
}
}
}
}
func CmdMultiprint(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
var tasks sync.WaitGroup
for {
payload, a, err := in.Receive()
if err != nil {
return
}
if a != nil {
tasks.Add(1)
go func(payload []byte, attachment *os.File) {
defer tasks.Done()
msg := data.Message(string(payload))
input := bufio.NewScanner(attachment)
for input.Scan() {
fmt.Printf("[%s] %s\n", msg.Pretty(), input.Text())
}
}(payload, a)
}
}
tasks.Wait()
}
func CmdListen(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
return
}
u, err := url.Parse(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
l, err := net.Listen(u.Scheme, u.Host)
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
for {
conn, err := l.Accept()
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
f, err := connToFile(conn)
if err != nil {
conn.Close()
continue
}
out.Send(data.Empty().Set("type", "socket").Set("remoteaddr", conn.RemoteAddr().String()).Bytes(), f)
}
}
func CmdBeamsend(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) < 2 {
if err := out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil); err != nil {
Fatal(err)
}
return
}
var connector func(string) (chan net.Conn, error)
connector = dialer
connections, err := connector(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
// Copy in to conn
SendToConn(connections, in)
}
func CmdBeamreceive(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
if err := out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil); err != nil {
Fatal(err)
}
return
}
var connector func(string) (chan net.Conn, error)
connector = listener
connections, err := connector(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
// Copy in to conn
ReceiveFromConn(connections, out)
}
func CmdConnect(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
if len(args) != 2 {
out.Send(data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
return
}
u, err := url.Parse(args[1])
if err != nil {
out.Send(data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
return
}
var tasks sync.WaitGroup
for {
_, attachment, err := in.Receive()
if err != nil {
break
}
if attachment == nil {
continue
}
Logf("connecting to %s/%s\n", u.Scheme, u.Host)
conn, err := net.Dial(u.Scheme, u.Host)
if err != nil {
out.Send(data.Empty().Set("cmd", "msg", "connect error: " + err.Error()).Bytes(), nil)
return
}
out.Send(data.Empty().Set("cmd", "msg", "connection established").Bytes(), nil)
tasks.Add(1)
go func(attachment *os.File, conn net.Conn) {
defer tasks.Done()
// even when successful, conn.File() returns a duplicate,
// so we must close the original
var iotasks sync.WaitGroup
iotasks.Add(2)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(attachment, conn)
}(attachment, conn)
go func(attachment *os.File, conn net.Conn) {
defer iotasks.Done()
io.Copy(conn, attachment)
}(attachment, conn)
iotasks.Wait()
conn.Close()
attachment.Close()
}(attachment, conn)
}
tasks.Wait()
}
func CmdOpenfile(args []string, stdout, stderr io.Writer, in beam.Receiver, out beam.Sender) {
for _, name := range args {
f, err := os.Open(name)
if err != nil {
continue
}
if err := out.Send(data.Empty().Set("path", name).Set("type", "file").Bytes(), f); err != nil {
f.Close()
}
}
}