Golang T.Errorf方法代碼示例

// processRegistration handles flags related to the registration category
func processRegistration(log logger.T) (exitCode int) {
	if activationCode == "" || activationID == "" || region == "" {
		// clear registration
		if clear {
			return clearRegistration(log)
		}
		flagUsage()
		return 1
	}

	// check if previously registered
	if !force && registration.InstanceID() != "" {
		confirmation, err := askForConfirmation()
		if err != nil {
			log.Errorf("Registration failed due to %v", err)
			return 1
		}

		if !confirmation {
			log.Info("Registration canceled by user")
			return 1
		}
	}

	managedInstanceID, err := registerManagedInstance()
	if err != nil {
		log.Errorf("Registration failed due to %v", err)
		return 1
	}

	log.Infof("Successfully registered the instance with AWS SSM using Managed instance-id: %s", managedInstanceID)
	return 0
}

// initializeBookkeepingLocations - initializes all folder locations required for bookkeeping
func initializeBookkeepingLocations(log logger.T, instanceID string) bool {

	//Create folders pending, current, completed, corrupt under the location DefaultLogDirPath/<instanceId>
	log.Info("Initializing bookkeeping folders")
	initStatus := true
	folders := []string{
		appconfig.DefaultLocationOfPending,
		appconfig.DefaultLocationOfCurrent,
		appconfig.DefaultLocationOfCompleted,
		appconfig.DefaultLocationOfCorrupt}

	for _, folder := range folders {

		directoryName := path.Join(appconfig.DefaultDataStorePath,
			instanceID,
			appconfig.DefaultCommandRootDirName,
			appconfig.DefaultLocationOfState,
			folder)

		err := fileutil.MakeDirs(directoryName)
		if err != nil {
			log.Errorf("Encountered error while creating folders for internal state management. %v", err)
			initStatus = false
			break
		}
	}

	return initStatus
}

// processFingerprint handles flags related to the fingerprint category
func processFingerprint(log logger.T) (exitCode int) {
	if err := fingerprint.SetSimilarityThreshold(similarityThreshold); err != nil {
		log.Errorf("Error setting the SimilarityThreshold. %v", err)
		return 1
	}
	log.Infof("Fingerprint SimilarityTHreshold set to %v", similarityThreshold)
	return 0
}

// clearRegistration clears any existing registration data
func clearRegistration(log logger.T) (exitCode int) {
	err := registration.UpdateServerInfo("", "", "", "")
	if err == nil {
		log.Info("Registration information has been removed from the instance.")
		return 0
	}
	log.Errorf("error clearing the instance registration information. %v\nTry running as sudo/administrator.", err)
	return 1
}

// Run as a single process. Used by Unix systems and when running agent from console.
func run(log logger.T) {
	// run core manager
	cpm, err := start(log, instanceIDPtr, regionPtr)
	if err != nil {
		log.Errorf("error occured when starting amazon-ssm-agent: %v", err)
		return
	}
	blockUntilSignaled(log)
	stop(log, cpm)
}

func start(log logger.T, instanceIDPtr *string, regionPtr *string) (cpm *coremanager.CoreManager, err error) {
	log.Infof("Starting Agent: %v", version.String())
	log.Infof("OS: %s, Arch: %s", runtime.GOOS, runtime.GOARCH)
	log.Flush()

	if cpm, err = coremanager.NewCoreManager(instanceIDPtr, regionPtr, log); err != nil {
		log.Errorf("error occured when starting core manager: %v", err)
		return
	}
	cpm.Start()
	return
}

// uploadOutput uploads the stdout and stderr file to S3
func (c *contextManager) uploadOutput(log log.T, context *UpdateContext) (err error) {

	awsConfig := sdkutil.AwsConfig()
	var config appconfig.SsmagentConfig
	config, err = appconfig.Config(false)

	if err != nil {
		return fmt.Errorf("could not load config file: %v", err)
	}
	// If customers have provided override in app config, honor that.
	if config.S3.Region != "" {
		awsConfig.Region = &config.S3.Region
	}
	log.Infof("Uploading output files to region: %v", *awsConfig.Region)

	s3 := s3.New(session.New(awsConfig))

	// upload outputs (if any) to s3
	uploader := s3util.NewManager(s3)
	uploadOutputsToS3 := func() {
		// delete temp outputDir once we're done
		defer pluginutil.DeleteDirectory(log, updateutil.UpdateOutputDirectory(context.Current.UpdateRoot))

		// get stdout file path
		stdoutPath := updateutil.UpdateStandOutPath(context.Current.UpdateRoot, context.Current.StdoutFileName)
		s3Key := path.Join(context.Current.OutputS3KeyPrefix, context.Current.StdoutFileName)
		log.Debugf("Uploading %v to s3://%v/%v", stdoutPath, context.Current.OutputS3BucketName, s3Key)
		err = uploader.S3Upload(context.Current.OutputS3BucketName, s3Key, stdoutPath)
		if err != nil {
			log.Errorf("failed uploading %v to s3://%v/%v \n err:%v",
				stdoutPath,
				context.Current.OutputS3BucketName,
				s3Key,
				err)
		}

		// get stderr file path
		stderrPath := updateutil.UpdateStandOutPath(context.Current.UpdateRoot, context.Current.StderrFileName)
		s3Key = path.Join(context.Current.OutputS3KeyPrefix, context.Current.StderrFileName)
		log.Debugf("Uploading %v to s3://%v/%v", stderrPath, context.Current.OutputS3BucketName, s3Key)
		err = uploader.S3Upload(context.Current.OutputS3BucketName, s3Key, stderrPath)
		if err != nil {
			log.Errorf("failed uploading %v to s3://%v/%v \n err:%v", stderrPath, context.Current.StderrFileName, s3Key, err)
		}
	}

	uploadOutputsToS3()

	return nil
}

// HandleAwsError logs an AWS error.
func HandleAwsError(log log.T, err error, stopPolicy *StopPolicy) {
	if err != nil {
		// notice that we're using 1, so it will actually log the where
		// the error happened, 0 = this function, we don't want that.
		pc, fn, line, _ := runtime.Caller(1)
		log.Debugf("error in %s[%s:%d] %v", runtime.FuncForPC(pc).Name(), fn, line, err)

		// In case this is aws error, update the stop policy as well.
		if aErr, ok := err.(awserr.Error); ok {
			// Generic AWS Error with Code, Message, and original error (if any)
			log.Debugf("AWS error. Code: %v, Message: %v, origerror: %v ", aErr.Code(), aErr.Message(), aErr.OrigErr())

			// special treatment for Timeout exception - as this is expected
			if aErr.Code() == "RequestError" && aErr.OrigErr() != nil && strings.Contains(aErr.OrigErr().Error(), "Client.Timeout") {
				// resetting the error count to 0 - as these exceptions are all expected
				if stopPolicy != nil {
					resetStopPolicy(stopPolicy)
				}
				return
			}
		}

		log.Errorf("error when calling AWS APIs. error details - %v", err)
		if stopPolicy != nil {
			log.Infof("increasing error count by 1")
			stopPolicy.AddErrorCount(1)
		}

	} else {
		// there is no error,
		resetStopPolicy(stopPolicy)
	}
}

// getCmdState reads commandState from given file
func getCmdState(log log.T, fileName string) message.CommandState {

	var commandState message.CommandState
	err := jsonutil.UnmarshalFile(fileName, &commandState)
	if err != nil {
		log.Errorf("encountered error with message %v while reading Interim state of command from file - %v", err, fileName)
	} else {
		//logging interim state as read from the file
		jsonString, err := jsonutil.Marshal(commandState)
		if err != nil {
			log.Errorf("encountered error with message %v while marshalling %v to string", err, commandState)
		} else {
			log.Tracef("interim CommandState read from file-system - %v", jsonutil.Indent(jsonString))
		}
	}

	return commandState
}

// runJob executes a job and then sends a signal on the given channel
func runJob(log log.T, job func(), doneChannel chan struct{}) {
	defer func() {
		// recover in case the job panics
		if msg := recover(); msg != nil {
			log.Errorf("Job failed with message %v", msg)
		}
		doneChannel <- struct{}{}
	}()
	job()
}

// RemoveData deletes the fileName from locationFolder under defaultLogDir/instanceID
func RemoveData(log log.T, commandID, instanceID, locationFolder string) {

	absoluteFileName := getCmdStateFileName(commandID, instanceID, locationFolder)

	err := fileutil.DeleteFile(absoluteFileName)
	if err != nil {
		log.Errorf("encountered error %v while deleting file %v", err, absoluteFileName)
	} else {
		log.Debugf("successfully deleted file %v", absoluteFileName)
	}
}

// ValidParameters checks if parameter names are valid. Returns valid parameters only.
func ValidParameters(log log.T, params map[string]interface{}) map[string]interface{} {
	validParams := make(map[string]interface{})
	for paramName, paramValue := range params {
		if validName(paramName) {
			validParams[paramName] = paramValue
		} else {
			log.Errorf("invalid parameter name %v", paramName)
		}
	}
	return validParams
}

// CreateScriptFile creates a script containing the given commands.
func CreateScriptFile(log log.T, scriptPath string, runCommand []string) (err error) {
	var sourceFile *os.File
	var scriptFile *os.File

	// create script file
	mode := int(appconfig.ReadWriteExecuteAccess)
	scriptFile, err = os.OpenFile(scriptPath, os.O_CREATE|os.O_WRONLY, os.FileMode(mode))
	if err != nil {
		log.Errorf("failed to create local script file %v, err %v", scriptPath, err)
		return
	}
	defer func() {
		cerr := scriptFile.Close()
		if err == nil {
			err = cerr
		}
	}()

	// write source commands to file
	if sourceFile != nil {
		if _, err = io.Copy(scriptFile, sourceFile); err != nil {
			log.Errorf("failed to write source scripts to file %v", scriptPath)
			return
		}
		_, err = scriptFile.WriteString("\n")
		if err != nil {
			log.Errorf("failed to write source scripts scripts to file %v", scriptPath)
			return
		}
	}

	// write source commands to file
	_, err = scriptFile.WriteString(strings.Join(runCommand, "\n") + "\n")
	if err != nil {
		log.Errorf("failed to write runcommand scripts to file %v", scriptPath)
		return
	}

	return
}

// finalizeUpdateAndSendReply completes the update and send reply to message service
func (u *updateManager) finalizeUpdateAndSendReply(log log.T, context *UpdateContext, errorCode string) (err error) {
	update := context.Current
	update.EndDateTime = time.Now().UTC()

	// resolve context location base on the UpdateRoot
	contextLocation := updateutil.UpdateContextFilePath(update.UpdateRoot)
	if err = u.ctxMgr.saveUpdateContext(log, context, contextLocation); err != nil {
		return err
	}

	// send reply
	if update.HasMessageID() {
		if err = u.svc.SendReply(log, update); err != nil {
			log.Errorf(err.Error())
		}

		if err = u.svc.DeleteMessage(log, update); err != nil {
			log.Errorf(err.Error())
		}
	}

	// update health information
	if err = u.svc.UpdateHealthCheck(log, update, errorCode); err != nil {
		log.Errorf(err.Error())
	}

	// upload output to s3 bucket
	log.Debugf("output s3 bucket name is %v", update.OutputS3BucketName)
	if update.OutputS3BucketName != "" {
		u.ctxMgr.uploadOutput(log, context)
	}

	context.cleanUpdate()
	if err = u.ctxMgr.saveUpdateContext(log, context, contextLocation); err != nil {
		return err
	}

	return nil
}

// FileCopy copies the content from reader to destinationPath file
func FileCopy(log log.T, destinationPath string, src io.Reader) (written int64, err error) {

	var file *os.File
	file, err = os.Create(destinationPath)
	if err != nil {
		log.Errorf("failed to create file. %v", err)
		return
	}
	defer file.Close()
	var size int64
	size, err = io.Copy(file, src)
	log.Infof("%s with %v bytes downloaded", destinationPath, size)
	return
}