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daemon.go
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daemon.go
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package container_daemon
import (
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"syscall"
"code.cloudfoundry.org/garden"
)
const DefaultRootPATH = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
const DefaultUserPath = "/usr/local/bin:/usr/bin:/bin"
const (
ProcessRequest = iota
ProcessResponse
SignalRequest
SignalResponse
)
type RequestMessage struct {
Type int
Data json.RawMessage
}
type ResponseMessage struct {
Type int
Files []StreamingFile `json:"-"`
Pid int
ErrMessage string
}
type StreamingFile interface {
io.ReadWriteCloser
Fd() uintptr
}
//go:generate counterfeiter -o fake_connection_handler/FakeConnectionHandler.go . ConnectionHandler
type ConnectionHandler interface {
Handle(decoder *json.Decoder) (*ResponseMessage, error)
}
//go:generate counterfeiter -o fake_listener/FakeListener.go . Listener
type Listener interface {
Listen(ch ConnectionHandler) error
Close() error
}
//go:generate counterfeiter -o fake_cmdpreparer/fake_cmdpreparer.go . CmdPreparer
type CmdPreparer interface {
PrepareCmd(garden.ProcessSpec) (*exec.Cmd, error)
}
//go:generate counterfeiter -o fake_spawner/FakeSpawner.go . Spawner
type Spawner interface {
Spawn(cmd *exec.Cmd, withTty bool) ([]*os.File, error)
}
//go:generate counterfeiter -o fake_signaller/FakeSignaller.go . Signaller
type Signaller interface {
Signal(pid int, signal syscall.Signal) error
}
type ContainerDaemon struct {
CmdPreparer CmdPreparer
Spawner Spawner
Signaller Signaller
}
type SignalSpec struct {
Pid int
Signal syscall.Signal
}
func (cd *ContainerDaemon) Run(listener Listener) error {
if err := listener.Listen(cd); err != nil {
return fmt.Errorf("container_daemon: listening for connections: %s", err)
}
return nil
}
func (cd *ContainerDaemon) Handle(decoder *json.Decoder) (response *ResponseMessage, err error) {
defer func() {
if recoveredErr := recover(); recoveredErr != nil {
err = fmt.Errorf("container_daemon: recovered panic: %s", recoveredErr)
}
}()
var cmd *exec.Cmd
var request RequestMessage
err = decoder.Decode(&request)
if err != nil {
return nil, fmt.Errorf("container_daemon: decode message spec: %s", err)
}
response = &ResponseMessage{}
switch request.Type {
case ProcessRequest:
var spec garden.ProcessSpec
if err := json.Unmarshal(request.Data, &spec); err != nil {
return nil, fmt.Errorf("container_daemon: json unmarshal process spec: %s", err)
}
if cmd, err = cd.CmdPreparer.PrepareCmd(spec); err != nil {
return nil, err
}
var files []*os.File
if files, err = cd.Spawner.Spawn(cmd, spec.TTY != nil); err != nil {
return nil, err
}
if len(files) > 0 {
response.Files = make([]StreamingFile, len(files))
for i, f := range files {
response.Files[i] = f
}
}
response.Type = ProcessResponse
response.Pid = cmd.Process.Pid
case SignalRequest:
var spec SignalSpec
if err := json.Unmarshal(request.Data, &spec); err != nil {
return nil, fmt.Errorf("container_daemon: json unmarshal signal spec: %s", err)
}
if err := cd.Signaller.Signal(spec.Pid, spec.Signal); err != nil {
return nil, err
}
response.Type = SignalResponse
default:
return nil, fmt.Errorf("container_daemon: unknown message: %s", request)
}
return
}