Esempio n. 1
0
// NewTaskRunner is used to create a new task context
func NewTaskRunner(logger *log.Logger, config *config.Config,
	updater TaskStateUpdater, ctx *driver.ExecContext,
	alloc *structs.Allocation, task *structs.Task) *TaskRunner {

	// Merge in the task resources
	task.Resources = alloc.TaskResources[task.Name]

	// Build the restart tracker.
	tg := alloc.Job.LookupTaskGroup(alloc.TaskGroup)
	if tg == nil {
		logger.Printf("[ERR] client: alloc '%s' for missing task group '%s'", alloc.ID, alloc.TaskGroup)
		return nil
	}
	restartTracker := newRestartTracker(tg.RestartPolicy, alloc.Job.Type)

	resourceUsage, err := stats.NewRingBuff(config.StatsDataPoints)
	if err != nil {
		logger.Printf("[ERR] client: can't create resource usage buffer: %v", err)
		return nil
	}

	tc := &TaskRunner{
		config:         config,
		updater:        updater,
		logger:         logger,
		restartTracker: restartTracker,
		resourceUsage:  resourceUsage,
		ctx:            ctx,
		alloc:          alloc,
		task:           task,
		updateCh:       make(chan *structs.Allocation, 64),
		destroyCh:      make(chan struct{}),
		waitCh:         make(chan struct{}),
	}

	return tc
}
Esempio n. 2
0
// NewClient is used to create a new client from the given configuration
func NewClient(cfg *config.Config) (*Client, error) {
	// Create a logger
	logger := log.New(cfg.LogOutput, "", log.LstdFlags)

	resourceUsage, err := stats.NewRingBuff(cfg.StatsDataPoints)
	if err != nil {
		return nil, err
	}

	// Create the client
	c := &Client{
		config:             cfg,
		start:              time.Now(),
		connPool:           nomad.NewPool(cfg.LogOutput, clientRPCCache, clientMaxStreams, nil),
		logger:             logger,
		hostStatsCollector: stats.NewHostStatsCollector(),
		resourceUsage:      resourceUsage,
		allocs:             make(map[string]*AllocRunner),
		allocUpdates:       make(chan *structs.Allocation, 64),
		shutdownCh:         make(chan struct{}),
	}

	// Initialize the client
	if err := c.init(); err != nil {
		return nil, fmt.Errorf("failed to initialize client: %v", err)
	}

	// Setup the node
	if err := c.setupNode(); err != nil {
		return nil, fmt.Errorf("node setup failed: %v", err)
	}

	// Fingerprint the node
	if err := c.fingerprint(); err != nil {
		return nil, fmt.Errorf("fingerprinting failed: %v", err)
	}

	// Scan for drivers
	if err := c.setupDrivers(); err != nil {
		return nil, fmt.Errorf("driver setup failed: %v", err)
	}

	// Setup the reserved resources
	c.reservePorts()

	// Set up the known servers list
	c.SetServers(c.config.Servers)

	// Store the config copy before restoring state but after it has been
	// initialized.
	c.configCopy = c.config.Copy()

	// Restore the state
	if err := c.restoreState(); err != nil {
		return nil, fmt.Errorf("failed to restore state: %v", err)
	}

	// Setup the consul client
	if err := c.setupConsulClient(); err != nil {
		return nil, fmt.Errorf("failed to create consul client: %v")
	}

	// Register and then start heartbeating to the servers.
	go c.registerAndHeartbeat()

	// Begin periodic snapshotting of state.
	go c.periodicSnapshot()

	// Begin syncing allocations to the server
	go c.allocSync()

	// Start the client!
	go c.run()

	// Start collecting stats
	go c.collectHostStats()

	// Start the consul sync
	go c.syncConsul()

	return c, nil
}