зеркало из https://github.com/microsoft/docker.git
110 строки
3.3 KiB
Go
110 строки
3.3 KiB
Go
package runconfig
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/docker/docker/pkg/broadcaster"
|
|
"github.com/docker/docker/pkg/ioutils"
|
|
)
|
|
|
|
// StreamConfig holds information about I/O streams managed together.
|
|
//
|
|
// streamConfig.StdinPipe returns a WriteCloser which can be used to feed data
|
|
// to the standard input of the streamConfig's active process.
|
|
// streamConfig.StdoutPipe and streamConfig.StderrPipe each return a ReadCloser
|
|
// which can be used to retrieve the standard output (and error) generated
|
|
// by the container's active process. The output (and error) are actually
|
|
// copied and delivered to all StdoutPipe and StderrPipe consumers, using
|
|
// a kind of "broadcaster".
|
|
type StreamConfig struct {
|
|
sync.WaitGroup
|
|
stdout *broadcaster.Unbuffered
|
|
stderr *broadcaster.Unbuffered
|
|
stdin io.ReadCloser
|
|
stdinPipe io.WriteCloser
|
|
}
|
|
|
|
// NewStreamConfig creates a stream config and initializes
|
|
// the standard err and standard out to new unbuffered broadcasters.
|
|
func NewStreamConfig() *StreamConfig {
|
|
return &StreamConfig{
|
|
stderr: new(broadcaster.Unbuffered),
|
|
stdout: new(broadcaster.Unbuffered),
|
|
}
|
|
}
|
|
|
|
// Stdout returns the standard output in the configuration.
|
|
func (streamConfig *StreamConfig) Stdout() *broadcaster.Unbuffered {
|
|
return streamConfig.stdout
|
|
}
|
|
|
|
// Stderr returns the standard error in the configuration.
|
|
func (streamConfig *StreamConfig) Stderr() *broadcaster.Unbuffered {
|
|
return streamConfig.stderr
|
|
}
|
|
|
|
// Stdin returns the standard input in the configuration.
|
|
func (streamConfig *StreamConfig) Stdin() io.ReadCloser {
|
|
return streamConfig.stdin
|
|
}
|
|
|
|
// StdinPipe returns an input writer pipe as an io.WriteCloser.
|
|
func (streamConfig *StreamConfig) StdinPipe() io.WriteCloser {
|
|
return streamConfig.stdinPipe
|
|
}
|
|
|
|
// StdoutPipe creates a new io.ReadCloser with an empty bytes pipe.
|
|
// It adds this new out pipe to the Stdout broadcaster.
|
|
func (streamConfig *StreamConfig) StdoutPipe() io.ReadCloser {
|
|
bytesPipe := ioutils.NewBytesPipe()
|
|
streamConfig.stdout.Add(bytesPipe)
|
|
return bytesPipe
|
|
}
|
|
|
|
// StderrPipe creates a new io.ReadCloser with an empty bytes pipe.
|
|
// It adds this new err pipe to the Stderr broadcaster.
|
|
func (streamConfig *StreamConfig) StderrPipe() io.ReadCloser {
|
|
bytesPipe := ioutils.NewBytesPipe()
|
|
streamConfig.stderr.Add(bytesPipe)
|
|
return bytesPipe
|
|
}
|
|
|
|
// NewInputPipes creates new pipes for both standard inputs, Stdin and StdinPipe.
|
|
func (streamConfig *StreamConfig) NewInputPipes() {
|
|
streamConfig.stdin, streamConfig.stdinPipe = io.Pipe()
|
|
}
|
|
|
|
// NewNopInputPipe creates a new input pipe that will silently drop all messages in the input.
|
|
func (streamConfig *StreamConfig) NewNopInputPipe() {
|
|
streamConfig.stdinPipe = ioutils.NopWriteCloser(ioutil.Discard)
|
|
}
|
|
|
|
// CloseStreams ensures that the configured streams are properly closed.
|
|
func (streamConfig *StreamConfig) CloseStreams() error {
|
|
var errors []string
|
|
|
|
if streamConfig.stdin != nil {
|
|
if err := streamConfig.stdin.Close(); err != nil {
|
|
errors = append(errors, fmt.Sprintf("error close stdin: %s", err))
|
|
}
|
|
}
|
|
|
|
if err := streamConfig.stdout.Clean(); err != nil {
|
|
errors = append(errors, fmt.Sprintf("error close stdout: %s", err))
|
|
}
|
|
|
|
if err := streamConfig.stderr.Clean(); err != nil {
|
|
errors = append(errors, fmt.Sprintf("error close stderr: %s", err))
|
|
}
|
|
|
|
if len(errors) > 0 {
|
|
return fmt.Errorf(strings.Join(errors, "\n"))
|
|
}
|
|
|
|
return nil
|
|
}
|