750 lines
18 KiB
Go
750 lines
18 KiB
Go
package main
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import (
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"bufio"
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"crypto/rand"
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"encoding/hex"
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"fmt"
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"github.com/dotcloud/docker/pkg/beam"
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"github.com/dotcloud/docker/pkg/beam/data"
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"github.com/dotcloud/docker/pkg/dockerscript"
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"github.com/dotcloud/docker/pkg/term"
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"io"
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"net"
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"net/url"
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"os"
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"os/exec"
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"path"
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"strings"
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"sync"
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)
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var rootPlugins = []string{
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"devnull",
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"stdio",
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}
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func main() {
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if len(os.Args) == 1 {
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if term.IsTerminal(0) {
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input := bufio.NewScanner(os.Stdin)
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for {
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os.Stdout.Write([]byte("beamsh> "))
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if !input.Scan() {
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break
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}
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line := input.Text()
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if len(line) != 0 {
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cmd, err := dockerscript.Parse(strings.NewReader(line))
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if err != nil {
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fmt.Fprintf(os.Stderr, "error: %v\n", err)
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continue
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}
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if err := executeRootScript(cmd); err != nil {
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Fatal(err)
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}
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}
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if err := input.Err(); err == io.EOF {
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break
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} else if err != nil {
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Fatal(err)
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}
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}
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} else {
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script, err := dockerscript.Parse(os.Stdin)
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if err != nil {
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Fatal("parse error: %v\n", err)
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}
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if err := executeRootScript(script); err != nil {
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Fatal(err)
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}
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}
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} else {
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for _, scriptpath := range os.Args[1:] {
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f, err := os.Open(scriptpath)
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if err != nil {
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Fatal(err)
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}
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script, err := dockerscript.Parse(f)
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if err != nil {
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Fatal("parse error: %v\n", err)
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}
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if err := executeRootScript(script); err != nil {
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Fatal(err)
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}
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}
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}
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}
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func beamCopy(dst *net.UnixConn, src *net.UnixConn) (int, error) {
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var n int
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for {
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payload, attachment, err := beam.Receive(src)
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if err == io.EOF {
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return n, nil
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} else if err != nil {
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return n, err
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}
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if err := beam.Send(dst, payload, attachment); err != nil {
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if attachment != nil {
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attachment.Close()
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}
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return n, err
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}
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n++
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}
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panic("impossibru!")
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return n, nil
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}
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type Handler func([]string, *net.UnixConn, *net.UnixConn)
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func Devnull() (*net.UnixConn, error) {
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priv, pub, err := beam.USocketPair()
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if err != nil {
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return nil, err
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}
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go func() {
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defer priv.Close()
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for {
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_, attachment, err := beam.Receive(priv)
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if err != nil {
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return
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}
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if attachment != nil {
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attachment.Close()
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}
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}
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}()
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return pub, nil
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}
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func scriptString(script []*dockerscript.Command) string {
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lines := make([]string, 0, len(script))
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for _, cmd := range script {
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line := strings.Join(cmd.Args, " ")
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if len(cmd.Children) > 0 {
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line += fmt.Sprintf(" { %s }", scriptString(cmd.Children))
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} else {
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line += " {}"
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}
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lines = append(lines, line)
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}
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return fmt.Sprintf("'%s'", strings.Join(lines, "; "))
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}
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func executeRootScript(script []*dockerscript.Command) error {
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if len(rootPlugins) > 0 {
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var (
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rootCmd *dockerscript.Command
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lastCmd *dockerscript.Command
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)
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for _, plugin := range rootPlugins {
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pluginCmd := &dockerscript.Command{
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Args: []string{plugin},
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}
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if rootCmd == nil {
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rootCmd = pluginCmd
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} else {
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lastCmd.Children = []*dockerscript.Command{pluginCmd}
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}
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lastCmd = pluginCmd
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}
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lastCmd.Children = script
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script = []*dockerscript.Command{rootCmd}
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}
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return executeScript(nil, script)
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}
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func executeScript(client *net.UnixConn, script []*dockerscript.Command) error {
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Debugf("executeScript(%s)\n", scriptString(script))
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defer Debugf("executeScript(%s) DONE\n", scriptString(script))
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var background sync.WaitGroup
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defer background.Wait()
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for _, cmd := range script {
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if cmd.Background {
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background.Add(1)
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go func(client *net.UnixConn, cmd *dockerscript.Command) {
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executeCommand(client, cmd)
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background.Done()
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}(client, cmd)
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} else {
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if err := executeCommand(client, cmd); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func dialer(addr string) (chan net.Conn, error) {
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u, err := url.Parse(addr)
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if err != nil {
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return nil, err
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}
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connections := make(chan net.Conn)
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go func() {
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defer close(connections)
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for {
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conn, err := net.Dial(u.Scheme, u.Host)
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if err != nil {
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return
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}
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connections <-conn
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}
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}()
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return connections, nil
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}
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func listener(addr string) (chan net.Conn, error) {
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u, err := url.Parse(addr)
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if err != nil {
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return nil, err
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}
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l, err := net.Listen(u.Scheme, u.Host)
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if err != nil {
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return nil, err
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}
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connections := make(chan net.Conn)
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go func() {
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defer close(connections)
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for {
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conn, err := l.Accept()
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if err != nil {
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return
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}
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Logf("new connection\n")
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connections<-conn
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}
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}()
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return connections, nil
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}
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func msgDesc(payload []byte, attachment *os.File) string {
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var filedesc string = "<nil>"
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if attachment != nil {
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filedesc = fmt.Sprintf("%d", attachment.Fd())
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}
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return fmt.Sprintf("'%s'[%s]", payload, filedesc)
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}
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func SendToConn(connections chan net.Conn, src *net.UnixConn) error {
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var tasks sync.WaitGroup
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defer tasks.Wait()
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for {
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payload, attachment, err := beam.Receive(src)
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if err == io.EOF {
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return nil
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} else if err != nil {
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return err
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}
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conn, ok := <-connections
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if !ok {
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break
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}
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Logf("Sending %s\n", msgDesc(payload, attachment))
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tasks.Add(1)
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go func(payload []byte, attachment *os.File, conn net.Conn) {
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defer tasks.Done()
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if _, err := conn.Write([]byte(data.EncodeString(string(payload)))); err != nil {
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return
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}
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if attachment == nil {
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conn.Close()
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return
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}
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var iotasks sync.WaitGroup
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iotasks.Add(2)
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go func(attachment *os.File, conn net.Conn) {
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defer iotasks.Done()
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Debugf("copying the connection to [%d]\n", attachment.Fd())
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io.Copy(attachment, conn)
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attachment.Close()
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Debugf("done copying the connection to [%d]\n", attachment.Fd())
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}(attachment, conn)
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go func(attachment *os.File, conn net.Conn) {
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defer iotasks.Done()
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Debugf("copying [%d] to the connection\n", attachment.Fd())
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io.Copy(conn, attachment)
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conn.Close()
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Debugf("done copying [%d] to the connection\n", attachment.Fd())
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}(attachment, conn)
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iotasks.Wait()
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}(payload, attachment, conn)
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}
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return nil
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}
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func bicopy(a, b io.ReadWriteCloser) {
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var iotasks sync.WaitGroup
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oneCopy := func(dst io.WriteCloser, src io.Reader) {
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defer iotasks.Done()
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io.Copy(dst, src)
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dst.Close()
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}
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iotasks.Add(2)
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go oneCopy(a, b)
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go oneCopy(b, a)
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iotasks.Wait()
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}
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func ReceiveFromConn(connections chan net.Conn, dst *net.UnixConn) error {
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for conn := range connections {
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err := func () error {
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Logf("parsing message from network...\n")
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defer Logf("done parsing message from network\n")
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buf := make([]byte, 4098)
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n, err := conn.Read(buf)
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if n == 0 {
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conn.Close()
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if err == io.EOF {
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return nil
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} else {
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return err
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}
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}
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Logf("decoding message from '%s'\n", buf[:n])
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header, skip, err := data.DecodeString(string(buf[:n]))
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if err != nil {
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conn.Close()
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return err
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}
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pub, priv, err := beam.SocketPair()
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if err != nil {
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return err
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}
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Logf("decoded message: %s\n", data.Message(header).Pretty())
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go func(skipped []byte, conn net.Conn, f *os.File) {
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// this closes both conn and f
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if len(skipped) > 0 {
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if _, err := f.Write(skipped); err != nil {
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Logf("ERROR: %v\n", err)
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f.Close()
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conn.Close()
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return
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}
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}
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bicopy(conn, f)
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}(buf[skip:n], conn, pub)
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if err := beam.Send(dst, []byte(header), priv); err != nil {
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return err
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}
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return nil
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}()
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if err != nil {
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Logf("Error reading from connection: %v\n", err)
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}
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}
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return nil
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}
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// 1) Find a handler for the command (if no handler, fail)
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// 2) Attach new in & out pair to the handler
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// 3) [in the background] Copy handler output to our own output
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// 4) [in the background] Run the handler
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// 5) Recursively executeScript() all children commands and wait for them to complete
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// 6) Wait for handler to return and (shortly afterwards) output copy to complete
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// 7)
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func executeCommand(client *net.UnixConn, cmd *dockerscript.Command) error {
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Debugf("executeCommand(%s)\n", strings.Join(cmd.Args, " "))
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defer Debugf("executeCommand(%s) DONE\n", strings.Join(cmd.Args, " "))
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handler := GetHandler(cmd.Args[0])
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if handler == nil {
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return fmt.Errorf("no such command: %s", cmd.Args[0])
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}
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inPub, inPriv, err := beam.USocketPair()
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if err != nil {
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return err
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}
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// Don't close inPub here. We close it to signify the end of input once
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// all children are completed (guaranteeing that no more input will be sent
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// by children).
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// Otherwise we get a deadlock.
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defer inPriv.Close()
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outPub, outPriv, err := beam.USocketPair()
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if err != nil {
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return err
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}
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defer outPub.Close()
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// don't close outPriv here. It must be closed after the handler is called,
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// but before the copy tasks associated with it completes.
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// Otherwise we get a deadlock.
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var tasks sync.WaitGroup
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tasks.Add(2)
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go func() {
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handler(cmd.Args, inPriv, outPriv)
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// FIXME: do we need to outPriv.sync before closing it?
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Debugf("[%s] handler returned, closing output\n", strings.Join(cmd.Args, " "))
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outPriv.Close()
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tasks.Done()
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}()
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go func() {
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if client != nil {
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Debugf("[%s] copy start...\n", strings.Join(cmd.Args, " "))
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n, err := beamCopy(client, outPub)
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if err != nil {
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Fatal(err)
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}
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Debugf("[%s] copied %d messages\n", strings.Join(cmd.Args, " "), n)
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Debugf("[%s] copy done\n", strings.Join(cmd.Args, " "))
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}
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tasks.Done()
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}()
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// depth-first execution of children commands
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// executeScript() blocks until all commands are completed
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executeScript(inPub, cmd.Children)
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inPub.Close()
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Debugf("[%s] waiting for handler and output copy to complete...\n", strings.Join(cmd.Args, " "))
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tasks.Wait()
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Debugf("[%s] handler and output copy complete!\n", strings.Join(cmd.Args, " "))
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return nil
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}
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func randomId() string {
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id := make([]byte, 4)
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io.ReadFull(rand.Reader, id)
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return hex.EncodeToString(id)
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}
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func sendWPipe(conn *net.UnixConn, payload []byte) (*os.File, error) {
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r, w, err := os.Pipe()
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if err != nil {
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return nil, err
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}
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if err := beam.Send(conn, payload, r); err != nil {
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r.Close()
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w.Close()
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return nil, err
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}
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return w, nil
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}
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func GetHandler(name string) Handler {
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if name == "devnull" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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for {
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_, attachment, err := beam.Receive(in)
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if err != nil {
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return
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}
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if attachment != nil {
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attachment.Close()
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}
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}
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}
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} else if name == "stdio" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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var tasks sync.WaitGroup
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defer tasks.Wait()
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for {
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payload, attachment, err := beam.Receive(in)
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if err != nil {
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return
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}
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tasks.Add(1)
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go func(payload []byte, attachment *os.File) {
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defer tasks.Done()
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if attachment == nil {
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return
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}
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defer attachment.Close()
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cmd := data.Message(payload).Get("cmd")
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if cmd == nil || len(cmd) == 0 {
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return
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}
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if cmd[0] != "log" {
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return
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}
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if len(cmd) == 1 || cmd[1] == "stdout" {
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io.Copy(os.Stdout, attachment)
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} else if cmd[1] == "stderr" {
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io.Copy(os.Stderr, attachment)
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}
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}(payload, attachment)
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}
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}
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} else if name == "echo" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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stdout, err := sendWPipe(out, data.Empty().Set("cmd", "log", "stdout").Bytes())
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if err != nil {
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return
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}
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fmt.Fprintln(stdout, strings.Join(args[1:], " "))
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stdout.Close()
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}
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} else if name == "pass" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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for {
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payload, attachment, err := beam.Receive(in)
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if err != nil {
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return
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}
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if err := beam.Send(out, payload, attachment); err != nil {
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if attachment != nil {
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attachment.Close()
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}
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return
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}
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}
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}
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} else if name == "in" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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os.Chdir(args[1])
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GetHandler("pass")([]string{"pass"}, in, out)
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}
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} else if name == "exec" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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cmd := exec.Command(args[1], args[2:]...)
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outR, outW, err := os.Pipe()
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if err != nil {
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return
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}
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cmd.Stdout = outW
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errR, errW, err := os.Pipe()
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if err != nil {
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return
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}
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cmd.Stderr = errW
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cmd.Stdin = os.Stdin
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beam.Send(out, data.Empty().Set("cmd", "log", "stdout").Bytes(), outR)
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beam.Send(out, data.Empty().Set("cmd", "log", "stderr").Bytes(), errR)
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execErr := cmd.Run()
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var status string
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if execErr != nil {
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status = execErr.Error()
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} else {
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status = "ok"
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}
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beam.Send(out, data.Empty().Set("status", status).Set("cmd", args...).Bytes(), nil)
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outW.Close()
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errW.Close()
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}
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} else if name == "trace" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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for {
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p, a, err := beam.Receive(in)
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if err != nil {
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return
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}
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var msg string
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if pretty := data.Message(string(p)).Pretty(); pretty != "" {
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msg = pretty
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} else {
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msg = string(p)
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}
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if a != nil {
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msg = fmt.Sprintf("%s [%d]", msg, a.Fd())
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}
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fmt.Printf("===> %s\n", msg)
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beam.Send(out, p, a)
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}
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}
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} else if name == "emit" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
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beam.Send(out, data.Parse(args[1:]).Bytes(), nil)
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}
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} else if name == "print" {
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return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
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for {
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_, a, err := beam.Receive(in)
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|
if err != nil {
|
|
return
|
|
}
|
|
if a != nil {
|
|
io.Copy(os.Stdout, a)
|
|
}
|
|
}
|
|
}
|
|
} else if name == "multiprint" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
var tasks sync.WaitGroup
|
|
for {
|
|
payload, a, err := beam.Receive(in)
|
|
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" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
if len(args) != 2 {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
|
|
return
|
|
}
|
|
u, err := url.Parse(args[1])
|
|
if err != nil {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
l, err := net.Listen(u.Scheme, u.Host)
|
|
if err != nil {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
for {
|
|
conn, err := l.Accept()
|
|
if err != nil {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
f, err := connToFile(conn)
|
|
if err != nil {
|
|
conn.Close()
|
|
continue
|
|
}
|
|
beam.Send(out, data.Empty().Set("type", "socket").Set("remoteaddr", conn.RemoteAddr().String()).Bytes(), f)
|
|
}
|
|
}
|
|
} else if name == "beamsend" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
if len(args) < 2 {
|
|
if err := beam.Send(out, 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 {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
// Copy in to conn
|
|
SendToConn(connections, in)
|
|
}
|
|
} else if name == "beamreceive" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
if len(args) != 2 {
|
|
if err := beam.Send(out, 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 {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
// Copy in to conn
|
|
ReceiveFromConn(connections, out)
|
|
}
|
|
} else if name == "connect" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
if len(args) != 2 {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", "wrong number of arguments").Bytes(), nil)
|
|
return
|
|
}
|
|
u, err := url.Parse(args[1])
|
|
if err != nil {
|
|
beam.Send(out, data.Empty().Set("status", "1").Set("message", err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
var tasks sync.WaitGroup
|
|
for {
|
|
_, attachment, err := beam.Receive(in)
|
|
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 {
|
|
beam.Send(out, data.Empty().Set("cmd", "msg", "connect error: " + err.Error()).Bytes(), nil)
|
|
return
|
|
}
|
|
beam.Send(out, 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" {
|
|
return func(args []string, in *net.UnixConn, out *net.UnixConn) {
|
|
for _, name := range args {
|
|
f, err := os.Open(name)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if err := beam.Send(out, data.Empty().Set("path", name).Set("type", "file").Bytes(), f); err != nil {
|
|
f.Close()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func connToFile(conn net.Conn) (f *os.File, err error) {
|
|
if connWithFile, ok := conn.(interface { File() (*os.File, error) }); !ok {
|
|
return nil, fmt.Errorf("no file descriptor available")
|
|
} else {
|
|
f, err = connWithFile.File()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return f, err
|
|
}
|
|
|
|
type Msg struct {
|
|
payload []byte
|
|
attachment *os.File
|
|
}
|
|
|
|
func Logf(msg string, args ...interface{}) (int, error) {
|
|
if len(msg) == 0 || msg[len(msg) - 1] != '\n' {
|
|
msg = msg + "\n"
|
|
}
|
|
msg = fmt.Sprintf("[%v] [%v] %s", os.Getpid(), path.Base(os.Args[0]), msg)
|
|
return fmt.Printf(msg, args...)
|
|
}
|
|
|
|
func Debugf(msg string, args ...interface{}) {
|
|
if os.Getenv("BEAMDEBUG") != "" {
|
|
Logf(msg, args...)
|
|
}
|
|
}
|
|
|
|
func Fatalf(msg string, args ...interface{}) {
|
|
Logf(msg, args)
|
|
os.Exit(1)
|
|
}
|
|
|
|
func Fatal(args ...interface{}) {
|
|
Fatalf("%v", args[0])
|
|
}
|