Golang ForHostname Examples

Example #1

File: executor.go Project: basho-labs/mesos-go

// NewMesosExecutorDriver creates a new mesos executor driver.
func NewMesosExecutorDriver(config DriverConfig) (*MesosExecutorDriver, error) {
	if config.Executor == nil {
		msg := "Executor callback interface cannot be nil."
		log.Errorln(msg)
		return nil, fmt.Errorf(msg)
	}

	hostname := mesosutil.GetHostname(config.HostnameOverride)
	newMessenger := config.NewMessenger
	if newMessenger == nil {
		newMessenger = func() (messenger.Messenger, error) {
			process := process.New("executor")
			return messenger.ForHostname(process, hostname, config.BindingAddress, config.BindingPort, config.PublishedAddress)
		}
	}

	driver := &MesosExecutorDriver{
		status:  mesosproto.Status_DRIVER_NOT_STARTED,
		stopCh:  make(chan struct{}),
		updates: make(map[string]*mesosproto.StatusUpdate),
		tasks:   make(map[string]*mesosproto.TaskInfo),
		workDir: ".",
		started: make(chan struct{}),
	}
	driver.cond = sync.NewCond(&driver.lock)
	// decouple serialized executor callback execution from goroutines of this driver
	var execLock sync.Mutex
	driver.withExecutor = func(f func(e Executor)) {
		go func() {
			execLock.Lock()
			defer execLock.Unlock()
			f(config.Executor)
		}()
	}
	var err error
	if driver.messenger, err = newMessenger(); err != nil {
		return nil, err
	}
	if err = driver.init(); err != nil {
		log.Errorf("failed to initialize the driver: %v", err)
		return nil, err
	}
	return driver, nil
}

Example #2

File: scheduler.go Project: basho-labs/mesos-go

// Create a new mesos scheduler driver with the given
// scheduler, framework info,
// master address, and credential(optional)
func NewMesosSchedulerDriver(config DriverConfig) (initializedDriver *MesosSchedulerDriver, err error) {
	if config.Scheduler == nil {
		err = fmt.Errorf("Scheduler callbacks required.")
	} else if config.Master == "" {
		err = fmt.Errorf("Missing master location URL.")
	} else if config.Framework == nil {
		err = fmt.Errorf("FrameworkInfo must be provided.")
	} else if config.Credential != nil && config.WithAuthContext == nil {
		err = fmt.Errorf("WithAuthContext must be provided when Credential != nil")
	}
	if err != nil {
		return
	}

	framework := proto.Clone(config.Framework).(*mesos.FrameworkInfo)

	// set default userid
	if framework.GetUser() == "" {
		user, err := user.Current()
		if err != nil || user == nil {
			if err != nil {
				log.Warningf("Failed to obtain username: %v\n", err)
			} else {
				log.Warningln("Failed to obtain username.")
			}
			framework.User = proto.String("")
		} else {
			framework.User = proto.String(user.Username)
		}
	}

	// default hostname
	hostname := util.GetHostname(config.HostnameOverride)
	if framework.GetHostname() == "" {
		framework.Hostname = proto.String(hostname)
	}

	driver := &MesosSchedulerDriver{
		frameworkInfo:   framework,
		stopCh:          make(chan struct{}),
		status:          mesos.Status_DRIVER_NOT_STARTED,
		cache:           newSchedCache(),
		credential:      config.Credential,
		failover:        framework.Id != nil && len(framework.Id.GetValue()) > 0,
		withAuthContext: config.WithAuthContext,
		started:         make(chan struct{}),
		done:            make(chan struct{}),
	}

	driver.withScheduler = driver.makeWithScheduler(config.Scheduler)

	if framework.FailoverTimeout != nil && *framework.FailoverTimeout > 0 {
		driver.failoverTimeout = *framework.FailoverTimeout * float64(time.Second)
		log.V(1).Infof("found failover_timeout = %v", time.Duration(driver.failoverTimeout))
	}

	newDetector := config.NewDetector
	if newDetector == nil {
		newDetector = func() (detector.Master, error) {
			return detector.New(config.Master)
		}
	}
	newMessenger := config.NewMessenger
	if newMessenger == nil {
		newMessenger = func() (messenger.Messenger, error) {
			process := process.New("scheduler")
			return messenger.ForHostname(process, hostname, config.BindingAddress, config.BindingPort, config.PublishedAddress)
		}
	}

	// initialize new detector.
	if driver.masterDetector, err = newDetector(); err != nil {
		return
	} else if driver.messenger, err = newMessenger(); err != nil {
		return
	} else if err = driver.init(); err != nil {
		return
	} else {
		initializedDriver = driver
	}
	return
}