Golang Host.AddJob方法代碼示例

func startJob(s *State, hc *cluster.Host, job *host.Job) error {
	jobStatus := make(chan error)
	events := make(chan *host.Event)
	stream, err := hc.StreamEvents(job.ID, events)
	if err != nil {
		return err
	}
	go func() {
		defer stream.Close()
	loop:
		for {
			select {
			case e, ok := <-events:
				if !ok {
					break loop
				}
				switch e.Event {
				case "start", "stop":
					jobStatus <- nil
					return
				case "error":
					job, err := hc.GetJob(job.ID)
					if err != nil {
						jobStatus <- err
						return
					}
					if job.Error == nil {
						jobStatus <- fmt.Errorf("bootstrap: unknown error from host")
						return
					}
					jobStatus <- fmt.Errorf("bootstrap: host error while launching job: %q", *job.Error)
					return
				default:
				}
			case <-time.After(30 * time.Second):
				jobStatus <- errors.New("bootstrap: timed out waiting for job event")
				return
			}
		}
		jobStatus <- fmt.Errorf("bootstrap: host job stream disconnected unexpectedly: %q", stream.Err())
	}()

	if err := hc.AddJob(job); err != nil {
		return err
	}

	return <-jobStatus
}

func startJob(s *State, hc *cluster.Host, job *host.Job) (*Job, error) {
	data := &Job{HostID: hc.ID(), JobID: job.ID}

	jobStatus := make(chan error)
	events := make(chan *host.Event)
	stream, err := hc.StreamEvents(data.JobID, events)
	if err != nil {
		return nil, err
	}
	go func() {
		defer stream.Close()
		for e := range events {
			switch e.Event {
			case "start", "stop":
				jobStatus <- nil
				return
			case "error":
				job, err := hc.GetJob(data.JobID)
				if err != nil {
					jobStatus <- err
					return
				}
				if job.Error == nil {
					jobStatus <- fmt.Errorf("bootstrap: unknown error from host")
					return
				}
				jobStatus <- fmt.Errorf("bootstrap: host error while launching job: %q", *job.Error)
				return
			default:
			}
		}
		jobStatus <- fmt.Errorf("bootstrap: host job stream disconnected unexpectedly: %q", stream.Err())
	}()

	if err := hc.AddJob(job); err != nil {
		return nil, err
	}

	return data, <-jobStatus
}

//.........這裏部分代碼省略.........
		watchCh := make(chan *discoverd.Event)
		upCh := make(chan string)
		stream, err := service.Watch(watchCh)
		if err != nil {
			return nil, fmt.Errorf("error watching discoverd service: %s", err)
		}
		go func() {
			var current bool
			for event := range watchCh {
				if event.Kind == discoverd.EventKindCurrent {
					current = true
					continue
				}
				if !current || event.Kind != discoverd.EventKindUp {
					continue
				}
				if event.Instance.Meta["FLYNN_JOB_ID"] == jobID {
					upCh <- event.Instance.Addr
				}
			}
		}()
		return func() (string, error) {
			f.l.Info("waiting for postgres instance to start", "job.id", jobID)
			defer stream.Close()
			select {
			case addr := <-upCh:
				return addr, nil
			case <-time.After(time.Minute):
				return "", fmt.Errorf("timed out waiting for postgres instance to come up")
			}
		}, nil
	}

	var wait func() (string, error)
	have := len(instances)
	want := 2
	if state.Singleton {
		want = 1
	}
	if have >= want {
		return fmt.Errorf("already have enough postgres instances, unable to fix")
	}
	f.l.Info("attempting to start missing postgres jobs", "want", want, "have", have)
	if leader == nil {
		// if no postgres, attempt to start
		job.ID = cluster.GenerateJobID(host.ID(), "")
		f.FixJobEnv(job)
		f.l.Info("starting postgres primary job", "job.id", job.ID)
		wait, err = waitForInstance(job.ID)
		if err != nil {
			return err
		}
		if err := host.AddJob(job); err != nil {
			return fmt.Errorf("error starting postgres primary job on %s: %s", host.ID(), err)
		}
		have++
	}
	if want > have {
		// if not enough postgres instances, start another
		var secondHost *cluster.Host
		for _, h := range f.hosts {
			if h.ID() != host.ID() {
				secondHost = h
				break
			}
		}
		if secondHost == nil {
			// if there are no other hosts, use the same one we put the primary on
			secondHost = host
		}
		job.ID = cluster.GenerateJobID(secondHost.ID(), "")
		f.FixJobEnv(job)
		f.l.Info("starting second postgres job", "job.id", job.ID)
		if wait == nil {
			wait, err = waitForInstance(job.ID)
			if err != nil {
				return err
			}
		}
		if err := utils.ProvisionVolume(secondHost, job); err != nil {
			return fmt.Errorf("error creating postgres volume on %s: %s", secondHost.ID(), err)
		}
		if err := secondHost.AddJob(job); err != nil {
			return fmt.Errorf("error starting additional postgres job on %s: %s", secondHost.ID(), err)
		}
	}

	if wait != nil {
		addr, err := wait()
		if err != nil {
			return err
		}
		if leader != nil {
			addr = leader.Addr
		}
		f.l.Info("waiting for postgres to come up read-write")
		return pgmanager.NewClient(addr).WaitForReadWrite(5 * time.Minute)
	}
	return nil
}

//.........這裏部分代碼省略.........
				log.Error("error extracting host id from jobID", "jobID", jobID, "err", err)
			}
			h := f.Host(hostID)
			if h != nil {
				if err := h.StopJob(jobID); err != nil {
					log.Error("error stopping unassigned sirenia job", "jobID", jobID)
				}
			} else {
				log.Error("host not found", "hostID", hostID)
			}
		}
	}

	isRunning := func(addr string) bool {
		for _, i := range instances {
			if i.Addr == addr {
				return true
			}
		}
		return false
	}

	// if the leader isn't currently running then start it using primaryJob/primaryHost
	var wait func() (string, error)
	if !isRunning(state.Primary.Addr) {
		// if we don't have info about the primary job attempt to promote the sync
		if primaryJob == nil {
			if syncJob != nil {
				// set primary job to sync
				primaryJob = syncJob
				primaryHost = syncHost

				// nil out sync job now so we can re-allocate it.
				syncJob = nil
				syncHost = nil
			} else {
				return fmt.Errorf("neither primary or sync job info available")
			}
		}

		primaryJob.ID = cluster.GenerateJobID(primaryHost.ID(), "")
		f.FixJobEnv(primaryJob)
		log.Info("starting primary job", "job.id", primaryJob.ID)
		wait, err = waitForInstance(primaryJob.ID)
		if err != nil {
			return err
		}
		if err := primaryHost.AddJob(primaryJob); err != nil {
			return fmt.Errorf("error starting primary job on %s: %s", primaryHost.ID(), err)
		}
	}
	if !state.Singleton && !isRunning(state.Sync.Addr) {
		if syncHost == nil {
			for _, h := range f.hosts {
				if h.ID() != primaryHost.ID() {
					syncHost = h
					break
				}
			}
			if syncHost == nil {
				// if there are no other hosts, use the same one we put the primary on
				syncHost = primaryHost
			}
		}
		// if we don't have a sync job then copy the primary job
		// and provision a new volume
		if syncJob == nil {
			syncJob = primaryJob
			vol := &ct.VolumeReq{Path: "/data"}
			if _, err := utils.ProvisionVolume(vol, syncHost, syncJob); err != nil {
				return fmt.Errorf("error creating volume on %s: %s", syncHost.ID(), err)
			}
		}
		syncJob.ID = cluster.GenerateJobID(syncHost.ID(), "")
		f.FixJobEnv(syncJob)
		log.Info("starting sync job", "job.id", syncJob.ID)
		if wait == nil {
			wait, err = waitForInstance(syncJob.ID)
			if err != nil {
				return err
			}
		}
		if err := syncHost.AddJob(syncJob); err != nil {
			return fmt.Errorf("error starting additional job on %s: %s", syncHost.ID(), err)
		}
	}

	if wait != nil {
		addr, err := wait()
		if err != nil {
			return err
		}
		if leader != nil && leader.Addr != "" {
			addr = leader.Addr
		}
		log.Info("waiting for cluster to come up read-write", "addr", addr)
		return sirenia.NewClient(addr).WaitForReadWrite(5 * time.Minute)
	}
	return nil
}