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docker.go
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docker.go
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package docker
import (
"archive/tar"
"compress/gzip"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"sync"
"time"
log "github.com/sirupsen/logrus"
"github.com/argoproj/argo-workflows/v3/errors"
"github.com/argoproj/argo-workflows/v3/util"
"github.com/argoproj/argo-workflows/v3/util/file"
"github.com/argoproj/argo-workflows/v3/workflow/common"
)
var errContainerNotExist = fmt.Errorf("container does not exist") // sentinel error
var started = time.Now()
type DockerExecutor struct {
namespace string
podName string
containers map[string]string // containerName -> containerID
}
func NewDockerExecutor(namespace, podName string) (*DockerExecutor, error) {
log.Infof("Creating a docker executor")
return &DockerExecutor{namespace, podName, make(map[string]string)}, nil
}
func (d *DockerExecutor) GetFileContents(containerName string, sourcePath string) (string, error) {
// Uses docker cp command to return contents of the file
// NOTE: docker cp CONTAINER:SRC_PATH DEST_PATH|- streams the contents of the resource
// as a tar archive to STDOUT if using - as DEST_PATH. Thus, we need to extract the
// content from the tar archive and output into stdout. In this way, we do not need to
// create and copy the content into a file from the wait container.
containerID, err := d.getContainerID(containerName)
if err != nil {
return "", err
}
dockerCpCmd := fmt.Sprintf("docker cp -a %s:%s - | tar -ax -O", containerID, sourcePath)
out, err := common.RunShellCommand(dockerCpCmd)
if err != nil {
return "", err
}
return string(out), nil
}
func (d *DockerExecutor) CopyFile(containerName string, sourcePath string, destPath string, compressionLevel int) error {
log.Infof("Archiving %s:%s to %s", containerName, sourcePath, destPath)
containerID, err := d.getContainerID(containerName)
if err != nil {
return err
}
dockerCpCmd := getDockerCpCmd(containerID, sourcePath, compressionLevel, destPath)
_, err = common.RunShellCommand(dockerCpCmd)
if err != nil {
return err
}
copiedFile, err := os.Open(destPath)
if err != nil {
return err
}
defer util.Close(copiedFile)
gzipReader, err := gzip.NewReader(copiedFile)
if err != nil {
return err
}
if !file.ExistsInTar(sourcePath, tar.NewReader(gzipReader)) {
errMsg := fmt.Sprintf("path %s does not exist in archive %s", sourcePath, destPath)
log.Warn(errMsg)
return errors.Errorf(errors.CodeNotFound, errMsg)
}
log.Infof("Archiving completed")
return nil
}
type cmdCloser struct {
io.Reader
cmd *exec.Cmd
}
func (c *cmdCloser) Close() error {
err := c.cmd.Wait()
if err != nil {
return errors.InternalWrapError(err)
}
return nil
}
func (d *DockerExecutor) GetOutputStream(ctx context.Context, containerName string, combinedOutput bool) (io.ReadCloser, error) {
containerID, err := d.getContainerID(containerName)
if err != nil {
return nil, err
}
cmd := exec.Command("docker", "logs", containerID)
log.Info(cmd.Args)
stdout, err := cmd.StdoutPipe()
if err != nil {
return nil, errors.InternalWrapError(err)
}
if !combinedOutput {
err = cmd.Start()
if err != nil {
return nil, errors.InternalWrapError(err)
}
return stdout, nil
}
stderr, err := cmd.StderrPipe()
if err != nil {
return nil, errors.InternalWrapError(err)
}
err = cmd.Start()
if err != nil {
return nil, errors.InternalWrapError(err)
}
wg := &sync.WaitGroup{}
wg.Add(2)
reader, writer := io.Pipe()
go func() {
defer wg.Done()
_, _ = io.Copy(writer, stdout)
}()
go func() {
defer wg.Done()
_, _ = io.Copy(writer, stderr)
}()
go func() {
defer writer.Close()
wg.Wait()
}()
return &cmdCloser{Reader: reader, cmd: cmd}, nil
}
func (d *DockerExecutor) GetExitCode(ctx context.Context, containerName string) (string, error) {
containerID, err := d.getContainerID(containerName)
if err != nil {
return "", err
}
cmd := exec.Command("docker", "inspect", containerID, "--format='{{.State.ExitCode}}'")
reader, err := cmd.StdoutPipe()
if err != nil {
return "", errors.InternalWrapError(err, "Could not pipe STDOUT")
}
err = cmd.Start()
if err != nil {
return "", errors.InternalWrapError(err, "Could not start command")
}
defer func() { _ = reader.Close() }()
bytes, err := ioutil.ReadAll(reader)
if err != nil {
return "", errors.InternalWrapError(err, "Could not read from STDOUT")
}
out := string(bytes)
// Trims off a single newline for user convenience
outputLen := len(out)
if outputLen > 0 && out[outputLen-1] == '\n' {
out = out[:outputLen-1]
}
exitCode := strings.Trim(out, `'`)
// Ensure exit code is an int
if _, err := strconv.Atoi(exitCode); err != nil {
log.Warningf("Was not able to parse exit code output '%s' as int: %s", exitCode, err)
return "", nil
}
return exitCode, nil
}
func (d *DockerExecutor) Wait(ctx context.Context, containerNames []string) error {
err := d.syncContainerIDs(ctx, containerNames)
if err != nil {
return err
}
containerIDs, err := d.getContainerIDs(containerNames)
if err != nil {
return err
}
_, err = common.RunCommand("docker", append([]string{"wait"}, containerIDs...)...)
return err
}
func (d *DockerExecutor) syncContainerIDs(ctx context.Context, containerNames []string) error {
for {
select {
case <-ctx.Done():
return ctx.Err()
default:
output, err := common.RunCommand(
"docker",
"ps",
"--all", // container could have already exited, but there could also have been two containers for the same pod (old container not yet cleaned-up)
"--no-trunc", // display long container IDs
"--format={{.Status}}|{{.Label \"io.kubernetes.container.name\"}}|{{.ID}}|{{.CreatedAt}}", // similar to `Up 3 hours,main,035a98c4e72e,2021-03-08 17:25:15 -0800 PST`
// https://github.com/kubernetes/kubernetes/blob/ca6bdba014f0a98efe0e0dd4e15f57d1c121d6c9/pkg/kubelet/dockertools/labels.go#L37
"--filter=label=io.kubernetes.pod.namespace="+d.namespace,
"--filter=label=io.kubernetes.pod.name="+d.podName,
)
if err != nil {
return err
}
containerStatus := make(map[string]string)
for _, l := range strings.Split(string(output), "\n") {
parts := strings.Split(strings.TrimSpace(l), "|")
if len(parts) != 4 {
continue
}
status := strings.SplitN(parts[0], " ", 2)[0] // Created,Exited,Up,
containerName := parts[1]
if containerName == "POD" {
continue
}
containerID := parts[2]
createdAt, err := time.Parse("2006-01-02 15:04:05 -0700 MST", parts[3])
if err != nil {
return err
}
if containerID == "" || d.containers[containerName] == containerID {
continue
}
if createdAt.Before(started.Add(-15 * time.Second)) {
log.Infof("ignoring container %q created at %v, too long before process started", containerName, createdAt)
continue
}
if status == "Created" && containerStatus[containerName] != "" {
log.Infof("ignoring created container %q that would %s -> %s", containerName, containerStatus[containerName], status)
continue
}
d.containers[containerName] = containerID
containerStatus[containerName] = status
log.Infof("mapped container name %q to container ID %q (created at %v, status %s)", containerName, containerID, createdAt, status)
}
// sidecars start after the main containers, so we can't just exit once we know about all the main containers,
// we need a bit more time
if d.haveContainers(containerNames) && time.Since(started) > 3*time.Second {
return nil
}
}
time.Sleep(1 * time.Second) // this is a hard-loop because containers can run very short periods of time
}
}
func (d *DockerExecutor) haveContainers(containerNames []string) bool {
for _, n := range containerNames {
if d.containers[n] == "" {
return false
}
}
return true
}
func (d *DockerExecutor) getContainerID(containerName string) (string, error) {
if containerID, ok := d.containers[containerName]; ok {
return containerID, nil
}
return "", errContainerNotExist
}
// killContainers kills a list of containerNames first with a SIGTERM then with a SIGKILL after a grace period
func (d *DockerExecutor) Kill(ctx context.Context, containerNames []string, terminationGracePeriodDuration time.Duration) error {
containerIDs, err := d.getContainerIDs(containerNames)
if err != nil {
return err
}
if len(containerIDs) == 0 { // they may have already terminated
log.Info("zero container IDs, assuming all containers have exited successfully")
return nil
}
killArgs := append([]string{"kill", "--signal", "TERM"}, containerIDs...)
// docker kill will return with an error if a container has terminated already, which is not an error in this case.
// We therefore ignore any error. docker wait that follows will re-raise any other error with the container.
_, err = common.RunCommand("docker", killArgs...)
if err != nil {
if strings.Contains(err.Error(), "is not running") {
return nil
}
log.Warningf("Ignored error from 'docker kill --signal TERM': %s", err)
}
waitArgs := append([]string{"wait"}, containerIDs...)
waitCmd := exec.Command("docker", waitArgs...)
log.Info(waitCmd.Args)
if err := waitCmd.Start(); err != nil {
return errors.InternalWrapError(err)
}
// waitCh needs buffer of 1 so it can always send the result of waitCmd.Wait() without blocking.
// Otherwise, if the terminationGracePeriodSeconds elapses and the forced kill branch is run, there would
// be no receiver for waitCh and the goroutine would block forever
waitCh := make(chan error, 1)
go func() {
defer close(waitCh)
waitCh <- waitCmd.Wait()
}()
select {
case err = <-waitCh:
// waitCmd completed
case <-time.After(terminationGracePeriodDuration):
log.Infof("Timed out (%v) for containers to terminate gracefully. Killing forcefully", terminationGracePeriodDuration)
forceKillArgs := append([]string{"kill", "--signal", "KILL"}, containerIDs...)
forceKillCmd := exec.Command("docker", forceKillArgs...)
log.Info(forceKillCmd.Args)
// same as kill case above, we ignore any error
if err := forceKillCmd.Run(); err != nil {
log.Warningf("Ignored error from 'docker kill --signal KILL': %s", err)
}
}
if err != nil {
return errors.InternalWrapError(err)
}
log.Infof("Containers %s killed successfully", containerIDs)
return nil
}
func (d *DockerExecutor) ListContainerNames(ctx context.Context) ([]string, error) {
var containerNames []string
for n := range d.containers {
containerNames = append(containerNames, n)
}
return containerNames, nil
}
func (d *DockerExecutor) getContainerIDs(containerNames []string) ([]string, error) {
var containerIDs []string
for _, n := range containerNames {
containerID, err := d.getContainerID(n)
if err == errContainerNotExist {
continue
}
if err != nil {
return nil, err
}
containerIDs = append(containerIDs, containerID)
}
return containerIDs, nil
}
// getDockerCpCmd uses os-specific code to run `docker cp` and gzip/7zip to copy gzipped data from another
// container.
func getDockerCpCmd(containerID, sourcePath string, compressionLevel int, destPath string) string {
gzipCmd := "gzip %s > %s"
levelFlagParam := "-"
if runtime.GOOS == "windows" {
gzipCmd = "7za.exe a -tgzip -si %s %s"
levelFlagParam = "-mx"
}
var levelFlag string
switch compressionLevel {
case gzip.NoCompression:
// best we can do - if we skip gzip it's a different file
levelFlag = levelFlagParam + "1"
case gzip.DefaultCompression:
// use cmd default
levelFlag = ""
default:
// -1 through -9 (or error)
levelFlag = levelFlagParam + strconv.Itoa(compressionLevel)
}
return fmt.Sprintf("docker cp -a %s:%s - | %s", containerID, sourcePath, fmt.Sprintf(gzipCmd, levelFlag, destPath))
}