示例#1
0
func (c *Cmd) Start() error {
	if c.started {
		return errors.New("exec: already started")
	}
	c.started = true
	if c.cluster == nil {
		var err error
		c.cluster, err = cluster.NewClient()
		if err != nil {
			return err
		}
		c.closeCluster = true
	}

	hosts, err := c.cluster.ListHosts()
	if err != nil {
		return err
	}
	if c.HostID == "" {
		// TODO: check if this is actually random
		for c.HostID = range hosts {
			break
		}
	}
	if c.JobID == "" {
		c.JobID = cluster.RandomJobID("")
	}

	job := &host.Job{
		ID: c.JobID,
		Config: &docker.Config{
			Image: c.Image,
			Cmd:   c.Cmd,
			Tty:   c.TTY,
			Env:   formatEnv(c.Env),
		},
		Attributes: c.Attrs,
	}
	if c.Stdout != nil || c.stdoutPipe != nil {
		job.Config.AttachStdout = true
	}
	if c.Stderr != nil || c.stderrPipe != nil {
		job.Config.AttachStderr = true
	}
	if c.Stdin != nil || c.stdinPipe != nil {
		job.Config.AttachStdin = true
		job.Config.OpenStdin = true
		job.Config.StdinOnce = true
	}

	c.host, err = c.cluster.DialHost(c.HostID)
	if err != nil {
		return err
	}

	// subscribe to host events
	ch := make(chan *host.Event)
	stream := c.host.StreamEvents(job.ID, ch)
	go func() {
		for event := range ch {
			if event.Event == "stop" || event.Event == "error" {
				close(c.done)
				return
			}
		}
		c.streamErr = stream.Err()
		close(c.done)
		// TODO: handle disconnections
	}()

	var rwc cluster.ReadWriteCloser
	var attachWait func() error

	if c.Stdout != nil || c.Stderr != nil || c.Stdin != nil ||
		c.stdoutPipe != nil || c.stderrPipe != nil || c.stdinPipe != nil {
		req := &host.AttachReq{
			JobID:  job.ID,
			Height: c.TermHeight,
			Width:  c.TermWidth,
			Flags:  host.AttachFlagStream,
		}
		if job.Config.AttachStdout {
			req.Flags |= host.AttachFlagStdout
		}
		if job.Config.AttachStderr {
			req.Flags |= host.AttachFlagStderr
		}
		if job.Config.AttachStdin {
			req.Flags |= host.AttachFlagStdin
		}
		rwc, attachWait, err = c.host.Attach(req, true)
		if err != nil {
			c.close()
			return err
		}
	}

	goroutines := make([]func() error, 0, 4)

	c.attachConn = rwc
	if attachWait != nil {
		goroutines = append(goroutines, attachWait)
	}

	if c.stdinPipe != nil {
		c.stdinPipe.set(writeCloseCloser{rwc})
	} else if c.Stdin != nil {
		goroutines = append(goroutines, func() error {
			_, err := io.Copy(rwc, c.Stdin)
			rwc.CloseWrite()
			return err
		})
	}
	if !c.TTY {
		if c.stdoutPipe != nil || c.stderrPipe != nil {
			stdout, stderr := demultiplex.Streams(rwc)
			if c.stdoutPipe != nil {
				c.stdoutPipe.set(stdout)
			} else if c.Stdout != nil {
				goroutines = append(goroutines, cpFunc(c.Stdout, stdout))
			}
			if c.stderrPipe != nil {
				c.stderrPipe.set(stderr)
			} else if c.Stderr != nil {
				goroutines = append(goroutines, cpFunc(c.Stderr, stderr))
			}
		} else if c.Stdout != nil || c.Stderr != nil {
			goroutines = append(goroutines, func() error {
				return demultiplex.Copy(c.Stdout, c.Stderr, rwc)
			})
		}
	} else if c.stdoutPipe != nil {
		c.stdoutPipe.set(rwc)
	} else if c.Stdout != nil {
		goroutines = append(goroutines, cpFunc(c.Stdout, rwc))
	}

	c.errCh = make(chan error, len(goroutines))
	for _, fn := range goroutines {
		go func(fn func() error) {
			c.errCh <- fn()
		}(fn)
	}

	_, err = c.cluster.AddJobs(&host.AddJobsReq{HostJobs: map[string][]*host.Job{c.HostID: {job}}})
	return err
}
示例#2
0
文件: jobs.go 项目: upton/flynn
func runJob(app *ct.App, newJob ct.NewJob, releases *ReleaseRepo, artifacts *ArtifactRepo, cl clusterClient, req *http.Request, w http.ResponseWriter, r ResponseHelper) {
	data, err := releases.Get(newJob.ReleaseID)
	if err != nil {
		r.Error(err)
		return
	}
	release := data.(*ct.Release)
	data, err = artifacts.Get(release.ArtifactID)
	if err != nil {
		r.Error(err)
		return
	}
	artifact := data.(*ct.Artifact)
	image, err := utils.DockerImage(artifact.URI)
	if err != nil {
		log.Println("error parsing artifact uri", err)
		r.Error(ct.ValidationError{
			Field:   "artifact.uri",
			Message: "is invalid",
		})
		return
	}
	attach := strings.Contains(req.Header.Get("Accept"), "application/vnd.flynn.attach")

	job := &host.Job{
		ID: cluster.RandomJobID(""),
		Attributes: map[string]string{
			"flynn-controller.app":     app.ID,
			"flynn-controller.release": release.ID,
		},
		Config: &docker.Config{
			Cmd:          newJob.Cmd,
			Env:          utils.FormatEnv(release.Env, newJob.Env),
			Image:        image,
			AttachStdout: true,
			AttachStderr: true,
		},
	}
	if newJob.TTY {
		job.Config.Tty = true
	}
	if attach {
		job.Config.AttachStdin = true
		job.Config.StdinOnce = true
		job.Config.OpenStdin = true
	}

	hosts, err := cl.ListHosts()
	if err != nil {
		r.Error(err)
		return
	}
	// pick a random host
	var hostID string
	for hostID = range hosts {
		break
	}
	if hostID == "" {
		r.Error(errors.New("no hosts found"))
		return
	}

	var attachConn cluster.ReadWriteCloser
	var attachWait func() error
	if attach {
		attachReq := &host.AttachReq{
			JobID:  job.ID,
			Flags:  host.AttachFlagStdout | host.AttachFlagStderr | host.AttachFlagStdin | host.AttachFlagStream,
			Height: newJob.Lines,
			Width:  newJob.Columns,
		}
		client, err := cl.DialHost(hostID)
		if err != nil {
			r.Error(fmt.Errorf("lorne connect failed: %s", err.Error()))
			return
		}
		defer client.Close()
		attachConn, attachWait, err = client.Attach(attachReq, true)
		if err != nil {
			r.Error(fmt.Errorf("attach failed: %s", err.Error()))
			return
		}
		defer attachConn.Close()
	}

	_, err = cl.AddJobs(&host.AddJobsReq{HostJobs: map[string][]*host.Job{hostID: {job}}})
	if err != nil {
		r.Error(fmt.Errorf("schedule failed: %s", err.Error()))
		return
	}

	if attach {
		if err := attachWait(); err != nil {
			r.Error(fmt.Errorf("attach wait failed: %s", err.Error()))
			return
		}
		w.Header().Set("Content-Type", "application/vnd.flynn.attach")
		w.Header().Set("Content-Length", "0")
		w.WriteHeader(http.StatusSwitchingProtocols)
		conn, _, err := w.(http.Hijacker).Hijack()
		if err != nil {
			panic(err)
		}
		defer conn.Close()

		done := make(chan struct{}, 2)
		cp := func(to cluster.ReadWriteCloser, from io.Reader) {
			io.Copy(to, from)
			to.CloseWrite()
			done <- struct{}{}
		}
		go cp(conn.(cluster.ReadWriteCloser), attachConn)
		go cp(attachConn, conn)
		<-done
		<-done

		return
	} else {
		r.JSON(200, &ct.Job{
			ID:        hostID + "-" + job.ID,
			ReleaseID: newJob.ReleaseID,
			Cmd:       newJob.Cmd,
		})
	}
}