Golang TaskEngine.MustInit方法代码示例

//.........这里部分代码省略.........
		}

		err = previousState.Load()
		if err != nil {
			log.Criticalf("Error loading previously saved state: %v", err)
			return exitcodes.ExitTerminal
		}

		if previousCluster != "" {
			// TODO Handle default cluster in a sane and unified way across the codebase
			configuredCluster := cfg.Cluster
			if configuredCluster == "" {
				log.Debug("Setting cluster to default; none configured")
				configuredCluster = config.DEFAULT_CLUSTER_NAME
			}
			if previousCluster != configuredCluster {
				log.Criticalf("Data mismatch; saved cluster '%v' does not match configured cluster '%v'. Perhaps you want to delete the configured checkpoint file?", previousCluster, configuredCluster)
				return exitcodes.ExitTerminal
			}
			cfg.Cluster = previousCluster
			log.Infof("Restored cluster '%v'", cfg.Cluster)
		}

		if instanceIdentityDoc, err := ec2.GetInstanceIdentityDocument(); err == nil {
			currentEc2InstanceID = instanceIdentityDoc.InstanceId
		} else {
			log.Criticalf("Unable to access EC2 Metadata service to determine EC2 ID: %v", err)
		}

		if previousEc2InstanceID != "" && previousEc2InstanceID != currentEc2InstanceID {
			log.Warnf("Data mismatch; saved InstanceID '%v' does not match current InstanceID '%v'. Overwriting old datafile", previousEc2InstanceID, currentEc2InstanceID)

			// Reset taskEngine; all the other values are still default
			taskEngine = engine.NewTaskEngine(cfg)
		} else {
			// Use the values we loaded if there's no issue
			containerInstanceArn = previousContainerInstanceArn
			taskEngine = previousTaskEngine
		}
	} else {
		log.Info("Checkpointing not enabled; a new container instance will be created each time the agent is run")
		taskEngine = engine.NewTaskEngine(cfg)
	}

	stateManager, err := initializeStateManager(cfg, taskEngine, &cfg.Cluster, &containerInstanceArn, &currentEc2InstanceID, acshandler.SequenceNumber)
	if err != nil {
		log.Criticalf("Error creating state manager: %v", err)
		return exitcodes.ExitTerminal
	}

	credentialProvider := auth.NewBasicAWSCredentialProvider()
	awsCreds := auth.ToSDK(credentialProvider)
	// Preflight request to make sure they're good
	if preflightCreds, err := awsCreds.Credentials(); err != nil || preflightCreds.AccessKeyID == "" {
		if preflightCreds != nil {
			log.Warnf("Error getting valid credentials (AKID %v): %v", preflightCreds.AccessKeyID, err)
		} else {
			log.Warnf("Error getting preflight credentials: %v", err)
		}
	}
	client := api.NewECSClient(awsCreds, cfg, *acceptInsecureCert)

	if containerInstanceArn == "" {
		log.Info("Registering Instance with ECS")
		containerInstanceArn, err = client.RegisterContainerInstance()
		if err != nil {
			log.Errorf("Error registering: %v", err)
			if retriable, ok := err.(utils.Retriable); ok && !retriable.Retry() {
				return exitcodes.ExitTerminal
			}
			return exitcodes.ExitError
		}
		log.Infof("Registration completed successfully. I am running as '%v' in cluster '%v'", containerInstanceArn, cfg.Cluster)
		// Save our shiny new containerInstanceArn
		stateManager.Save()
	} else {
		log.Infof("Restored from checkpoint file. I am running as '%v' in cluster '%v'", containerInstanceArn, cfg.Cluster)
	}

	// Begin listening to the docker daemon and saving changes
	taskEngine.SetSaver(stateManager)
	taskEngine.MustInit()

	go sighandlers.StartTerminationHandler(stateManager, taskEngine)

	// Agent introspection api
	go handlers.ServeHttp(&containerInstanceArn, taskEngine, cfg)

	// Start sending events to the backend
	go eventhandler.HandleEngineEvents(taskEngine, client, stateManager)

	log.Info("Beginning Polling for updates")
	err = acshandler.StartSession(containerInstanceArn, credentialProvider, cfg, taskEngine, client, stateManager, *acceptInsecureCert)
	if err != nil {
		log.Criticalf("Unretriable error starting communicating with ACS: %v", err)
		return exitcodes.ExitTerminal
	}
	log.Critical("ACS Session handler should never exit")
	return exitcodes.ExitError
}

//.........这里部分代码省略.........
		log.Criticalf("Error creating state manager: %v", err)
		return exitcodes.ExitTerminal
	}

	capabilities := taskEngine.Capabilities()

	// We instantiate our own credentialProvider for use in acs/tcs. This tries
	// to mimic roughly the way it's instantiated by the SDK for a default
	// session.
	credentialProvider := defaults.CredChain(defaults.Config(), defaults.Handlers())
	// Preflight request to make sure they're good
	if preflightCreds, err := credentialProvider.Get(); err != nil || preflightCreds.AccessKeyID == "" {
		log.Warnf("Error getting valid credentials (AKID %s): %v", preflightCreds.AccessKeyID, err)
	}
	client := api.NewECSClient(credentialProvider, cfg, httpclient.New(api.RoundtripTimeout, *acceptInsecureCert), ec2MetadataClient)

	if containerInstanceArn == "" {
		log.Info("Registering Instance with ECS")
		containerInstanceArn, err = client.RegisterContainerInstance("", capabilities)
		if err != nil {
			log.Errorf("Error registering: %v", err)
			if retriable, ok := err.(utils.Retriable); ok && !retriable.Retry() {
				return exitcodes.ExitTerminal
			}
			return exitcodes.ExitError
		}
		log.Infof("Registration completed successfully. I am running as '%s' in cluster '%s'", containerInstanceArn, cfg.Cluster)
		// Save our shiny new containerInstanceArn
		stateManager.Save()
	} else {
		log.Infof("Restored from checkpoint file. I am running as '%s' in cluster '%s'", containerInstanceArn, cfg.Cluster)
		_, err = client.RegisterContainerInstance(containerInstanceArn, capabilities)
		if err != nil {
			log.Errorf("Error re-registering: %v", err)
			if awserr, ok := err.(awserr.Error); ok && api.IsInstanceTypeChangedError(awserr) {
				log.Criticalf("The current instance type does not match the registered instance type. Please revert the instance type change, or alternatively launch a new instance. Error: %v", err)
				return exitcodes.ExitTerminal
			}
			return exitcodes.ExitError
		}
	}

	// Begin listening to the docker daemon and saving changes
	taskEngine.SetSaver(stateManager)
	imageManager.SetSaver(stateManager)
	taskEngine.MustInit()

	// start of the periodic image cleanup process
	if !cfg.ImageCleanupDisabled {
		go imageManager.StartImageCleanupProcess(ctx)
	}

	go sighandlers.StartTerminationHandler(stateManager, taskEngine)

	// Agent introspection api
	go handlers.ServeHttp(&containerInstanceArn, taskEngine, cfg)

	// Start serving the endpoint to fetch IAM Role credentials
	go credentialshandler.ServeHttp(credentialsManager, containerInstanceArn, cfg)

	// Start sending events to the backend
	go eventhandler.HandleEngineEvents(taskEngine, client, stateManager)

	deregisterInstanceEventStream := eventstream.NewEventStream(DeregisterContainerInstanceEventStream, ctx)
	deregisterInstanceEventStream.StartListening()

	telemetrySessionParams := tcshandler.TelemetrySessionParams{
		ContainerInstanceArn: containerInstanceArn,
		CredentialProvider:   credentialProvider,
		Cfg:                  cfg,
		DeregisterInstanceEventStream: deregisterInstanceEventStream,
		ContainerChangeEventStream:    containerChangeEventStream,
		DockerClient:                  dockerClient,
		AcceptInvalidCert:             *acceptInsecureCert,
		EcsClient:                     client,
		TaskEngine:                    taskEngine,
	}

	// Start metrics session in a go routine
	go tcshandler.StartMetricsSession(telemetrySessionParams)

	log.Info("Beginning Polling for updates")
	err = acshandler.StartSession(ctx, acshandler.StartSessionArguments{
		AcceptInvalidCert: *acceptInsecureCert,
		Config:            cfg,
		DeregisterInstanceEventStream: deregisterInstanceEventStream,
		ContainerInstanceArn:          containerInstanceArn,
		CredentialProvider:            credentialProvider,
		ECSClient:                     client,
		StateManager:                  stateManager,
		TaskEngine:                    taskEngine,
		CredentialsManager:            credentialsManager,
	})
	if err != nil {
		log.Criticalf("Unretriable error starting communicating with ACS: %v", err)
		return exitcodes.ExitTerminal
	}
	log.Critical("ACS Session handler should never exit")
	return exitcodes.ExitError
}