44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package utils // import "github.com/docker/docker/distribution/utils"
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import (
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"io"
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"net"
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"os"
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"syscall"
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"github.com/docker/docker/pkg/progress"
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"github.com/docker/docker/pkg/streamformatter"
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"github.com/sirupsen/logrus"
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)
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// WriteDistributionProgress is a helper for writing progress from chan to JSON
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// stream with an optional cancel function.
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func WriteDistributionProgress(cancelFunc func(), outStream io.Writer, progressChan <-chan progress.Progress) {
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progressOutput := streamformatter.NewJSONProgressOutput(outStream, false)
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operationCancelled := false
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for prog := range progressChan {
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if err := progressOutput.WriteProgress(prog); err != nil && !operationCancelled {
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// don't log broken pipe errors as this is the normal case when a client aborts
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if isBrokenPipe(err) {
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logrus.Info("Pull session cancelled")
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} else {
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logrus.Errorf("error writing progress to client: %v", err)
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}
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cancelFunc()
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operationCancelled = true
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// Don't return, because we need to continue draining
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// progressChan until it's closed to avoid a deadlock.
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}
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}
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}
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func isBrokenPipe(e error) bool {
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if netErr, ok := e.(*net.OpError); ok {
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e = netErr.Err
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if sysErr, ok := netErr.Err.(*os.SyscallError); ok {
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e = sysErr.Err
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}
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}
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return e == syscall.EPIPE
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}
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