DockerCLI/command/container/utils.go

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package container
import (
"strconv"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/versions"
"github.com/docker/docker/cli/command"
clientapi "github.com/docker/docker/client"
"golang.org/x/net/context"
)
func waitExitOrRemoved(ctx context.Context, dockerCli *command.DockerCli, containerID string, waitRemove bool) chan int {
if len(containerID) == 0 {
// containerID can never be empty
panic("Internal Error: waitExitOrRemoved needs a containerID as parameter")
}
var removeErr error
statusChan := make(chan int)
exitCode := 125
// Get events via Events API
f := filters.NewArgs()
f.Add("type", "container")
f.Add("container", containerID)
options := types.EventsOptions{
Filters: f,
}
eventCtx, cancel := context.WithCancel(ctx)
eventq, errq := dockerCli.Client().Events(eventCtx, options)
eventProcessor := func(e events.Message) bool {
stopProcessing := false
switch e.Status {
case "die":
if v, ok := e.Actor.Attributes["exitCode"]; ok {
code, cerr := strconv.Atoi(v)
if cerr != nil {
logrus.Errorf("failed to convert exitcode '%q' to int: %v", v, cerr)
} else {
exitCode = code
}
}
if !waitRemove {
stopProcessing = true
} else {
// If we are talking to an older daemon, `AutoRemove` is not supported.
// We need to fall back to the old behavior, which is client-side removal
if versions.LessThan(dockerCli.Client().ClientVersion(), "1.25") {
go func() {
removeErr = dockerCli.Client().ContainerRemove(ctx, containerID, types.ContainerRemoveOptions{RemoveVolumes: true})
if removeErr != nil {
logrus.Errorf("error removing container: %v", removeErr)
cancel() // cancel the event Q
}
}()
}
}
case "detach":
exitCode = 0
stopProcessing = true
case "destroy":
stopProcessing = true
}
return stopProcessing
}
go func() {
defer func() {
statusChan <- exitCode // must always send an exit code or the caller will block
cancel()
}()
for {
select {
case <-eventCtx.Done():
if removeErr != nil {
return
}
case evt := <-eventq:
if eventProcessor(evt) {
return
}
case err := <-errq:
logrus.Errorf("error getting events from daemon: %v", err)
return
}
}
}()
return statusChan
}
// getExitCode performs an inspect on the container. It returns
// the running state and the exit code.
func getExitCode(ctx context.Context, dockerCli *command.DockerCli, containerID string) (bool, int, error) {
c, err := dockerCli.Client().ContainerInspect(ctx, containerID)
if err != nil {
// If we can't connect, then the daemon probably died.
if !clientapi.IsErrConnectionFailed(err) {
return false, -1, err
}
return false, -1, nil
}
return c.State.Running, c.State.ExitCode, nil
}
func parallelOperation(ctx context.Context, containers []string, op func(ctx context.Context, container string) error) chan error {
if len(containers) == 0 {
return nil
}
const defaultParallel int = 50
sem := make(chan struct{}, defaultParallel)
errChan := make(chan error)
// make sure result is printed in correct order
output := map[string]chan error{}
for _, c := range containers {
output[c] = make(chan error, 1)
}
go func() {
for _, c := range containers {
err := <-output[c]
errChan <- err
}
}()
go func() {
for _, c := range containers {
sem <- struct{}{} // Wait for active queue sem to drain.
go func(container string) {
output[container] <- op(ctx, container)
<-sem
}(c)
}
}()
return errChan
}