DockerCLI/cli/command/service/helpers.go

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package service
import (
"io"
"io/ioutil"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/command/service/progress"
"github.com/docker/docker/pkg/jsonmessage"
"golang.org/x/net/context"
)
// waitOnService waits for the service to converge. It outputs a progress bar,
// if appropriate based on the CLI flags.
func waitOnService(ctx context.Context, dockerCli *command.DockerCli, serviceID string, opts *serviceOptions) error {
errChan := make(chan error, 1)
pipeReader, pipeWriter := io.Pipe()
go func() {
errChan <- progress.ServiceProgress(ctx, dockerCli.Client(), serviceID, pipeWriter)
}()
if opts.quiet {
go io.Copy(ioutil.Discard, pipeReader)
return <-errChan
}
err := jsonmessage.DisplayJSONMessagesToStream(pipeReader, dockerCli.Out(), nil)
if err == nil {
err = <-errChan
}
return err
}