pkg/package: remove promise package
The promise package represents a simple enough concurrency pattern that replicating it in place is sufficient. To end the propagation of this package, it has been removed and the uses have been inlined. While this code could likely be refactored to be simpler without the package, the changes have been minimized to reduce the possibility of defects. Someone else may want to do further refactoring to remove closures and reduce the number of goroutines in use. Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
parent
777d4a1bf4
commit
0cd4ab3f9a
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@ -7,7 +7,6 @@ import (
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"golang.org/x/net/context"
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"github.com/docker/docker/pkg/pools"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/term"
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"github.com/sirupsen/logrus"
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)
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@ -58,7 +57,7 @@ func (c *Config) AttachStreams(cfg *AttachConfig) {
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}
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// CopyStreams starts goroutines to copy data in and out to/from the container
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func (c *Config) CopyStreams(ctx context.Context, cfg *AttachConfig) chan error {
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func (c *Config) CopyStreams(ctx context.Context, cfg *AttachConfig) <-chan error {
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var (
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wg sync.WaitGroup
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errors = make(chan error, 3)
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@ -137,35 +136,42 @@ func (c *Config) CopyStreams(ctx context.Context, cfg *AttachConfig) chan error
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go attachStream("stdout", cfg.Stdout, cfg.CStdout)
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go attachStream("stderr", cfg.Stderr, cfg.CStderr)
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return promise.Go(func() error {
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done := make(chan struct{})
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go func() {
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wg.Wait()
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close(done)
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errs := make(chan error, 1)
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go func() {
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defer close(errs)
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errs <- func() error {
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done := make(chan struct{})
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go func() {
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wg.Wait()
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close(done)
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}()
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select {
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case <-done:
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case <-ctx.Done():
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// close all pipes
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if cfg.CStdin != nil {
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cfg.CStdin.Close()
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}
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if cfg.CStdout != nil {
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cfg.CStdout.Close()
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}
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if cfg.CStderr != nil {
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cfg.CStderr.Close()
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}
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<-done
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}
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close(errors)
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for err := range errors {
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if err != nil {
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return err
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}
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}
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return nil
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}()
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select {
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case <-done:
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case <-ctx.Done():
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// close all pipes
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if cfg.CStdin != nil {
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cfg.CStdin.Close()
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}
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if cfg.CStdout != nil {
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cfg.CStdout.Close()
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}
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if cfg.CStderr != nil {
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cfg.CStderr.Close()
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}
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<-done
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}
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close(errors)
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for err := range errors {
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if err != nil {
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return err
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}
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}
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return nil
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})
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}()
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return errs
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}
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func copyEscapable(dst io.Writer, src io.ReadCloser, keys []byte) (written int64, err error) {
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@ -20,7 +20,6 @@ import (
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/pools"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/system"
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"github.com/sirupsen/logrus"
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)
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@ -1095,36 +1094,42 @@ func (archiver *Archiver) CopyFileWithTar(src, dst string) (err error) {
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}
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r, w := io.Pipe()
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errC := promise.Go(func() error {
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defer w.Close()
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errC := make(chan error, 1)
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srcF, err := os.Open(src)
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if err != nil {
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return err
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}
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defer srcF.Close()
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go func() {
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defer close(errC)
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hdr, err := tar.FileInfoHeader(srcSt, "")
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if err != nil {
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return err
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}
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hdr.Name = filepath.Base(dst)
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hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
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errC <- func() error {
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defer w.Close()
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if err := remapIDs(archiver.IDMappingsVar, hdr); err != nil {
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return err
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}
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srcF, err := os.Open(src)
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if err != nil {
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return err
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}
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defer srcF.Close()
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tw := tar.NewWriter(w)
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defer tw.Close()
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if _, err := io.Copy(tw, srcF); 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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hdr, err := tar.FileInfoHeader(srcSt, "")
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if err != nil {
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return err
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}
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hdr.Name = filepath.Base(dst)
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hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
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if err := remapIDs(archiver.IDMappingsVar, hdr); err != nil {
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return err
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}
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tw := tar.NewWriter(w)
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defer tw.Close()
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if _, err := io.Copy(tw, srcF); 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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}()
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defer func() {
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if er := <-errC; err == nil && er != nil {
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err = er
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@ -9,7 +9,6 @@ import (
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/promise"
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"github.com/docker/docker/pkg/system"
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"github.com/sirupsen/logrus"
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)
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@ -122,40 +121,45 @@ func (archiver *Archiver) CopyFileWithTar(src, dst string) (err error) {
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}
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r, w := io.Pipe()
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errC := promise.Go(func() error {
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defer w.Close()
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errC := make(chan error, 1)
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srcF, err := srcDriver.Open(src)
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if err != nil {
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return err
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}
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defer srcF.Close()
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go func() {
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defer close(errC)
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errC <- func() error {
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defer w.Close()
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hdr, err := tar.FileInfoHeader(srcSt, "")
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if err != nil {
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return err
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}
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hdr.Name = dstDriver.Base(dst)
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if dstDriver.OS() == "windows" {
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hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
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} else {
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hdr.Mode = int64(os.FileMode(hdr.Mode))
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}
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srcF, err := srcDriver.Open(src)
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if err != nil {
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return err
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}
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defer srcF.Close()
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if err := remapIDs(archiver.IDMappingsVar, hdr); err != nil {
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return err
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}
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hdr, err := tar.FileInfoHeader(srcSt, "")
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if err != nil {
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return err
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}
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hdr.Name = dstDriver.Base(dst)
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if dstDriver.OS() == "windows" {
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hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
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} else {
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hdr.Mode = int64(os.FileMode(hdr.Mode))
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}
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tw := tar.NewWriter(w)
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defer tw.Close()
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if _, err := io.Copy(tw, srcF); 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 := remapIDs(archiver.IDMappingsVar, hdr); err != nil {
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return err
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}
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tw := tar.NewWriter(w)
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defer tw.Close()
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if err := tw.WriteHeader(hdr); err != nil {
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return err
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}
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if _, err := io.Copy(tw, srcF); 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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}()
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defer func() {
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if er := <-errC; err == nil && er != nil {
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err = er
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@ -1,11 +0,0 @@
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package promise
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// Go is a basic promise implementation: it wraps calls a function in a goroutine,
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// and returns a channel which will later return the function's return value.
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func Go(f func() error) chan error {
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ch := make(chan error, 1)
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go func() {
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ch <- f()
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}()
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return ch
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}
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@ -1,25 +0,0 @@
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package promise
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import (
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"errors"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestGo(t *testing.T) {
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errCh := Go(functionWithError)
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er := <-errCh
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require.EqualValues(t, "Error Occurred", er.Error())
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noErrCh := Go(functionWithNoError)
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er = <-noErrCh
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require.Nil(t, er)
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}
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func functionWithError() (err error) {
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return errors.New("Error Occurred")
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}
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func functionWithNoError() (err error) {
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return nil
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}
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