Golang ServiceState.IsPaused方法代码示例

// getStatus computes the status of a service state
func getStatus(conn client.Connection, state *servicestate.ServiceState) (dao.Status, error) {
	var status dao.Status

	// Set the state based on the service state object
	if !state.IsRunning() {
		status = dao.Stopped
	} else if state.IsPaused() {
		status = dao.Paused
	} else {
		status = dao.Running
	}

	// Set the state based on the host state object
	var hostState HostState
	if err := conn.Get(hostpath(state.HostID, state.ID), &hostState); err != nil && err != client.ErrNoNode {
		return dao.Status{}, err
	}

	if hostState.DesiredState == int(service.SVCStop) {
		switch status {
		case dao.Running, dao.Paused:
			status = dao.Stopping
		case dao.Stopped:
			// pass
		default:
			return dao.Status{}, ErrUnknownState
		}
	} else if hostState.DesiredState == int(service.SVCRun) {
		switch status {
		case dao.Stopped:
			status = dao.Starting
		case dao.Paused:
			status = dao.Resuming
		case dao.Running:
			// pass
		default:
			return dao.Status{}, ErrUnknownState
		}
	} else if hostState.DesiredState == int(service.SVCPause) {
		switch status {
		case dao.Running:
			status = dao.Pausing
		case dao.Paused, dao.Stopped:
			// pass
		default:
			return dao.Status{}, ErrUnknownState
		}
	} else {
		return dao.Status{}, ErrUnknownState
	}

	return status, nil
}

// Spawn listens for changes in the host state and manages running instances
func (l *HostStateListener) Spawn(shutdown <-chan interface{}, stateID string) {
	var processDone <-chan struct{}

	// Let's have exclusive access to this node
	lock := newInstanceLock(l.conn, stateID)
	if err := lock.Lock(); err != nil {
		glog.Errorf("Could not lock service instance %s on host %s: %s", stateID, l.hostID, err)
		return
	}
	// Get the HostState node
	var hs HostState
	if err := l.conn.Get(hostpath(l.hostID, stateID), &hs); err != nil {
		glog.Errorf("Could not load host instance %s on host %s: %s", stateID, l.hostID, err)
		l.conn.Delete(hostpath(l.hostID, stateID))
		lock.Unlock()
		return
	}
	defer removeInstance(l.conn, hs.ServiceID, hs.HostID, hs.ServiceStateID)
	// Get the ServiceState node
	var ss servicestate.ServiceState
	if err := l.conn.Get(servicepath(hs.ServiceID, hs.ServiceStateID), &ServiceStateNode{ServiceState: &ss}); err != nil {
		glog.Errorf("Could not load service instance %s for service %s on host %s: %s", hs.ServiceStateID, hs.ServiceID, hs.HostID, err)
		lock.Unlock()
		return
	}
	defer l.stopInstance(processDone, &ss)
	lock.Unlock()

	for {
		// Get the HostState instance
		hsEvt, err := l.conn.GetW(hostpath(l.hostID, stateID), &hs)
		if err != nil {
			glog.Errorf("Could not load host instance %s on host %s: %s", stateID, l.hostID, err)
			return
		}
		// Get the ServiceState instance
		ssEvt, err := l.conn.GetW(servicepath(hs.ServiceID, stateID), &ServiceStateNode{ServiceState: &ss})
		if err != nil {
			glog.Errorf("Could not load service state %s for service %s on host %s: %s", stateID, hs.ServiceID, l.hostID, err)
			return
		}
		// Get the service
		var svc service.Service
		if err := l.conn.Get(servicepath(hs.ServiceID), &ServiceNode{Service: &svc}); err != nil {
			glog.Errorf("Could not load service %s for service instance %s on host %s: %s", hs.ServiceID, stateID, l.hostID, err)
			return
		}

		// Process the desired state
		glog.V(2).Infof("Processing %s (%s); Desired State: %d", svc.Name, svc.ID, hs.DesiredState)
		switch service.DesiredState(hs.DesiredState) {
		case service.SVCRun:
			var err error
			if !ss.IsRunning() {
				// process has stopped
				glog.Infof("Starting a new instance for %s (%s): %s", svc.Name, svc.ID, stateID)
				if processDone, err = l.startInstance(&svc, &ss); err != nil {
					glog.Errorf("Could not start service instance %s for service %s on host %s: %s", hs.ServiceStateID, hs.ServiceID, hs.HostID, err)
					return
				}
			} else if processDone == nil {
				glog.Infof("Attaching to instance %s for %s (%s) via %s", stateID, svc.Name, svc.ID, ss.DockerID)
				if processDone, err = l.attachInstance(&svc, &ss); err != nil {
					glog.Errorf("Could not start service instance %s for service %s on host %s: %s", hs.ServiceStateID, hs.ServiceID, hs.HostID, err)
					return
				}
			}
			if ss.IsPaused() {
				glog.Infof("Resuming paused instance %s for service %s (%s)", stateID, svc.Name, svc.ID)
				if err := l.resumeInstance(&svc, &ss); err != nil {
					glog.Errorf("Could not resume paused instance %s for service %s (%s): %s", stateID, svc.Name, svc.ID, err)
					return
				}
			}
		case service.SVCPause:
			if !ss.IsPaused() {
				if err := l.pauseInstance(&svc, &ss); err != nil {
					glog.Errorf("Could not pause instance %s for service %s (%s): %s", stateID, svc.Name, svc.ID, err)
					return
				}
			}
		case service.SVCStop:
			return
		default:
			glog.V(2).Infof("Unhandled state (%d) of instance %s for service %s (%s)", hs.DesiredState, stateID, svc.Name, svc.ID, err)
		}

		select {
		case <-processDone:
			glog.V(2).Infof("Process ended for instance %s for service %s (%s)", stateID, svc.Name, svc.ID)
		case e := <-hsEvt:
			glog.V(3).Infof("Host instance %s for service %s (%s) received an event: %+v", stateID, svc.Name, svc.ID, e)
			if e.Type == client.EventNodeDeleted {
				return
			}
		case e := <-ssEvt:
			glog.V(3).Infof("Service instance %s for service %s (%s) received an event: %+v", stateID, svc.Name, svc.ID, e)
			if e.Type == client.EventNodeDeleted {
				return
//.........这里部分代码省略.........