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9a25b1d942
Creates a `fixedBuffer` type that is used to encapsulate functionality for reading/writing from the underlying byte slices. Uses lazily-loaded set of sync.Pools for storing buffers that are no longer needed so they can be re-used. ``` benchmark old ns/op new ns/op delta BenchmarkBytesPipeWrite-8 138469 48985 -64.62% BenchmarkBytesPipeRead-8 130922 56601 -56.77% benchmark old allocs new allocs delta BenchmarkBytesPipeWrite-8 18 8 -55.56% BenchmarkBytesPipeRead-8 0 0 +0.00% benchmark old bytes new bytes delta BenchmarkBytesPipeWrite-8 66903 1649 -97.54% BenchmarkBytesPipeRead-8 0 1 +Inf% ``` Signed-off-by: Brian Goff <cpuguy83@gmail.com>
109 lines
3.3 KiB
Go
109 lines
3.3 KiB
Go
package runconfig
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import (
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"fmt"
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"io"
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"io/ioutil"
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"strings"
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"sync"
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"github.com/docker/docker/pkg/broadcaster"
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"github.com/docker/docker/pkg/ioutils"
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)
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// StreamConfig holds information about I/O streams managed together.
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//
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// streamConfig.StdinPipe returns a WriteCloser which can be used to feed data
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// to the standard input of the streamConfig's active process.
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// streamConfig.StdoutPipe and streamConfig.StderrPipe each return a ReadCloser
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// which can be used to retrieve the standard output (and error) generated
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// by the container's active process. The output (and error) are actually
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// copied and delivered to all StdoutPipe and StderrPipe consumers, using
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// a kind of "broadcaster".
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type StreamConfig struct {
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sync.WaitGroup
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stdout *broadcaster.Unbuffered
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stderr *broadcaster.Unbuffered
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stdin io.ReadCloser
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stdinPipe io.WriteCloser
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}
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// NewStreamConfig creates a stream config and initializes
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// the standard err and standard out to new unbuffered broadcasters.
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func NewStreamConfig() *StreamConfig {
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return &StreamConfig{
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stderr: new(broadcaster.Unbuffered),
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stdout: new(broadcaster.Unbuffered),
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}
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}
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// Stdout returns the standard output in the configuration.
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func (streamConfig *StreamConfig) Stdout() *broadcaster.Unbuffered {
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return streamConfig.stdout
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}
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// Stderr returns the standard error in the configuration.
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func (streamConfig *StreamConfig) Stderr() *broadcaster.Unbuffered {
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return streamConfig.stderr
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}
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// Stdin returns the standard input in the configuration.
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func (streamConfig *StreamConfig) Stdin() io.ReadCloser {
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return streamConfig.stdin
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}
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// StdinPipe returns an input writer pipe as an io.WriteCloser.
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func (streamConfig *StreamConfig) StdinPipe() io.WriteCloser {
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return streamConfig.stdinPipe
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}
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// StdoutPipe creates a new io.ReadCloser with an empty bytes pipe.
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// It adds this new out pipe to the Stdout broadcaster.
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func (streamConfig *StreamConfig) StdoutPipe() io.ReadCloser {
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bytesPipe := ioutils.NewBytesPipe()
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streamConfig.stdout.Add(bytesPipe)
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return bytesPipe
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}
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// StderrPipe creates a new io.ReadCloser with an empty bytes pipe.
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// It adds this new err pipe to the Stderr broadcaster.
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func (streamConfig *StreamConfig) StderrPipe() io.ReadCloser {
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bytesPipe := ioutils.NewBytesPipe()
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streamConfig.stderr.Add(bytesPipe)
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return bytesPipe
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}
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// NewInputPipes creates new pipes for both standard inputs, Stdin and StdinPipe.
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func (streamConfig *StreamConfig) NewInputPipes() {
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streamConfig.stdin, streamConfig.stdinPipe = io.Pipe()
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}
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// NewNopInputPipe creates a new input pipe that will silently drop all messages in the input.
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func (streamConfig *StreamConfig) NewNopInputPipe() {
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streamConfig.stdinPipe = ioutils.NopWriteCloser(ioutil.Discard)
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}
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// CloseStreams ensures that the configured streams are properly closed.
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func (streamConfig *StreamConfig) CloseStreams() error {
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var errors []string
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if streamConfig.stdin != nil {
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if err := streamConfig.stdin.Close(); err != nil {
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errors = append(errors, fmt.Sprintf("error close stdin: %s", err))
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}
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}
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if err := streamConfig.stdout.Clean(); err != nil {
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errors = append(errors, fmt.Sprintf("error close stdout: %s", err))
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}
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if err := streamConfig.stderr.Clean(); err != nil {
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errors = append(errors, fmt.Sprintf("error close stderr: %s", err))
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}
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if len(errors) > 0 {
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return fmt.Errorf(strings.Join(errors, "\n"))
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}
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return nil
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}
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