Golang exec.CommandUsingCluster函數代碼示例

func (s *HostSuite) TestAttachFinishedInteractiveJob(t *c.C) {
	cluster := s.clusterClient(t)

	// run a quick interactive job
	cmd := exec.CommandUsingCluster(cluster, exec.DockerImage(imageURIs["test-apps"]), "/bin/true")
	cmd.TTY = true
	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()
	select {
	case err := <-runErr:
		t.Assert(err, c.IsNil)
	case <-time.After(30 * time.Second):
		t.Fatal("timed out waiting for interactive job")
	}

	h, err := cluster.Host(cmd.HostID)
	t.Assert(err, c.IsNil)

	// Getting the logs for the job should fail, as it has none because it was
	// interactive
	attachErr := make(chan error)
	go func() {
		_, err = h.Attach(&host.AttachReq{JobID: cmd.Job.ID, Flags: host.AttachFlagLogs}, false)
		attachErr <- err
	}()
	select {
	case err := <-attachErr:
		t.Assert(err, c.NotNil)
	case <-time.After(time.Second):
		t.Error("timed out waiting for attach")
	}
}

func (s *HostSuite) TestDevStdout(t *c.C) {
	cmd := exec.CommandUsingCluster(
		s.clusterClient(t),
		s.createArtifact(t, "test-apps"),
		"sh",
	)
	cmd.Stdin = strings.NewReader(`
echo foo > /dev/stdout
echo bar > /dev/stderr
echo "SUBSHELL: $(echo baz > /dev/stdout)"
echo "SUBSHELL: $(echo qux 2>&1 > /dev/stderr)" >&2`)
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()
	select {
	case err := <-runErr:
		t.Assert(err, c.IsNil)
	case <-time.After(30 * time.Second):
		t.Fatal("timed out waiting for /dev/stdout job")
	}

	t.Assert(stdout.String(), c.Equals, "foo\nSUBSHELL: baz\n")
	t.Assert(stderr.String(), c.Equals, "bar\nSUBSHELL: qux\n")
}

func (s *ControllerSuite) generateControllerExamples(t *c.C) map[string]interface{} {
	cmd := exec.CommandUsingCluster(
		s.clusterClient(t),
		s.createArtifact(t, "controller-examples"),
		"/bin/flynn-controller-examples",
	)
	cmd.Env = map[string]string{
		"CONTROLLER_KEY":      s.clusterConf(t).Key,
		"SKIP_MIGRATE_DOMAIN": "true",
	}

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr
	err := cmd.Run()
	t.Logf("stdout: %q", stdout.String())
	t.Logf("stderr: %q", stderr.String())
	t.Assert(err, c.IsNil)

	var controllerExamples map[string]json.RawMessage
	t.Assert(json.Unmarshal(stdout.Bytes(), &controllerExamples), c.IsNil)

	examples := make(map[string]interface{}, len(controllerExamples))
	for key, data := range controllerExamples {
		example, err := unmarshalControllerExample(data)
		t.Assert(err, c.IsNil)
		examples[key] = example
	}
	return examples
}

func (s *HostSuite) TestExecCrashingJob(t *c.C) {
	cluster := s.clusterClient(t)

	for _, attach := range []bool{true, false} {
		t.Logf("attach = %v", attach)
		cmd := exec.CommandUsingCluster(cluster, exec.DockerImage(imageURIs["test-apps"]), "sh", "-c", "exit 1")
		if attach {
			cmd.Stdout = ioutil.Discard
			cmd.Stderr = ioutil.Discard
		}
		t.Assert(cmd.Run(), c.DeepEquals, exec.ExitError(1))
	}
}

func (s *HostSuite) TestDevSHM(t *c.C) {
	cmd := exec.CommandUsingCluster(
		s.clusterClient(t),
		exec.DockerImage(imageURIs["test-apps"]),
		"sh", "-c", "df -h /dev/shm && echo foo > /dev/shm/asdf",
	)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out

	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()
	select {
	case err := <-runErr:
		t.Assert(err, c.IsNil)
	case <-time.After(30 * time.Second):
		t.Fatal("timed out waiting for /dev/shm job")
	}

	t.Assert(out.String(), c.Equals, "Filesystem                Size      Used Available Use% Mounted on\nshm                      64.0M         0     64.0M   0% /dev/shm\n")
}

func (s *HostSuite) TestDevStdout(t *c.C) {
	cmd := exec.CommandUsingCluster(
		s.clusterClient(t),
		exec.DockerImage(imageURIs["test-apps"]),
		"sh", "-c", "echo foo > /dev/stdout; echo bar > /dev/stderr",
	)
	var stdout, stderr bytes.Buffer
	cmd.Stdout = &stdout
	cmd.Stderr = &stderr

	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()
	select {
	case err := <-runErr:
		t.Assert(err, c.IsNil)
	case <-time.After(30 * time.Second):
		t.Fatal("timed out waiting for /dev/stdout job")
	}

	t.Assert(stdout.String(), c.Equals, "foo\n")
	t.Assert(stderr.String(), c.Equals, "bar\n")
}

func (s *HostSuite) TestNotifyOOM(t *c.C) {
	appID := random.UUID()

	// subscribe to init log messages from the logaggregator
	client, err := logaggc.New("")
	t.Assert(err, c.IsNil)
	opts := logagg.LogOpts{
		Follow:      true,
		StreamTypes: []logagg.StreamType{logagg.StreamTypeInit},
	}
	rc, err := client.GetLog(appID, &opts)
	t.Assert(err, c.IsNil)
	defer rc.Close()
	msgs := make(chan *logaggc.Message)
	stream := stream.New()
	defer stream.Close()
	go func() {
		defer close(msgs)
		dec := json.NewDecoder(rc)
		for {
			var msg logaggc.Message
			if err := dec.Decode(&msg); err != nil {
				stream.Error = err
				return
			}
			select {
			case msgs <- &msg:
			case <-stream.StopCh:
				return
			}
		}
	}()

	// run the OOM job
	cmd := exec.CommandUsingCluster(
		s.clusterClient(t),
		s.createArtifact(t, "test-apps"),
		"/bin/oom",
	)
	cmd.Meta = map[string]string{"flynn-controller.app": appID}
	runErr := make(chan error)
	go func() {
		runErr <- cmd.Run()
	}()

	// wait for the OOM notification
	for {
		select {
		case err := <-runErr:
			t.Assert(err, c.IsNil)
		case msg, ok := <-msgs:
			if !ok {
				t.Fatalf("message stream closed unexpectedly: %s", stream.Err())
			}
			t.Log(msg.Msg)
			if strings.Contains(msg.Msg, "FATAL: a container process was killed due to lack of available memory") {
				return
			}
		case <-time.After(30 * time.Second):
			t.Fatal("timed out waiting for OOM notification")
		}
	}
}