Golang T.Error方法代碼示例

// NewCoreManager creates a new core plugin manager.
func NewCoreManager(instanceIdPtr *string, regionPtr *string, log logger.T) (cm *CoreManager, err error) {

	// initialize appconfig
	var config appconfig.SsmagentConfig
	if config, err = appconfig.Config(false); err != nil {
		log.Errorf("Could not load config file: %v", err)
		return
	}

	// initialize region
	if *regionPtr != "" {
		if err = platform.SetRegion(*regionPtr); err != nil {
			log.Errorf("error occured setting the region, %v", err)
			return
		}
	}

	var region string
	if region, err = platform.Region(); err != nil {
		log.Errorf("error fetching the region, %v", err)
		return
	}
	log.Debug("Using region:", region)

	// initialize instance ID
	if *instanceIdPtr != "" {
		if err = platform.SetInstanceID(*instanceIdPtr); err != nil {
			log.Errorf("error occured setting the instance ID, %v", err)
			return
		}
	}

	var instanceId string
	if instanceId, err = platform.InstanceID(); err != nil {
		log.Errorf("error fetching the instanceID, %v", err)
		return
	}
	log.Debug("Using instanceID:", instanceId)

	if err = fileutil.HardenDataFolder(); err != nil {
		log.Errorf("error initializing SSM data folder with hardened ACL, %v", err)
		return
	}

	//Initialize all folders where interim states of executing commands will be stored.
	if !initializeBookkeepingLocations(log, instanceId) {
		log.Error("unable to initialize. Exiting")
		return
	}

	context := context.Default(log, config).With("[instanceID=" + instanceId + "]")
	corePlugins := coreplugins.RegisteredCorePlugins(context)

	return &CoreManager{
		context:     context,
		corePlugins: *corePlugins,
	}, nil
}

// ReplaceParameters traverses an arbitrarily complex input object (maps/slices/strings/etc.)
// and tries to replace parameters given as {{parameter}} with their values from the parameters map.
//
// Strings like "{{ parameter }}" are replaced directly with the value associated with
// the parameter. That value need not be a string.
//
// Strings like "a {{ parameter1 }} within a string" are replaced with strings where the parameters
// are replaced by a marshaled version of their values. In this case, the resulting object is always a string.
//
// Note: this only works on composite types []interface{} and map[string]interface{} which are what json.Unmarshal
// produces by default. If your object contains []string, for example, the object will be returned as is.
//
// Returns a new object with replaced parameters.
func ReplaceParameters(input interface{}, parameters map[string]interface{}, logger log.T) interface{} {
	switch input := input.(type) {
	case string:
		// handle single parameter case first
		for parameterName, parameterValue := range parameters {
			if isSingleParameterString(input, parameterName) {
				return parameterValue
			}
		}

		// look for multiple parameter strings
		for parameterName, parameterValue := range parameters {
			var parameterValueString string
			var err error
			if parameterValueString, err = convertToString(parameterValue); err != nil {
				logger.Error(err)
			}
			input = ReplaceParameter(input, parameterName, parameterValueString)
		}
		return input

	case []interface{}:
		// for slices, recursively replace parameters on each element of the slice
		out := make([]interface{}, len(input))
		for i, v := range input {
			out[i] = ReplaceParameters(v, parameters, logger)
		}
		return out

	case []map[string]interface{}:
		// this case is not caught by the one above because map cannot be converted to interface{}
		out := make([]map[string]interface{}, len(input))
		for i, v := range input {
			out[i] = ReplaceParameters(v, parameters, logger).(map[string]interface{})
		}
		return out

	case map[string]interface{}:
		// for maps, recursively replace parameters on each value in the map
		out := make(map[string]interface{})
		for k, v := range input {
			out[k] = ReplaceParameters(v, parameters, logger)
		}
		return out

	default:
		// any other type, return as is
		return input
	}
}

// Failed marks plugin as Failed
func (out *ApplicationPluginOutput) MarkAsFailed(log log.T, err error) {
	out.ExitCode = 1
	out.Status = contracts.ResultStatusFailed
	if len(out.Stderr) != 0 {
		out.Stderr = fmt.Sprintf("\n%v\n%v", out.Stderr, err.Error())
	} else {
		out.Stderr = fmt.Sprintf("\n%v", err.Error())
	}
	log.Error(err.Error())
	out.Errors = append(out.Errors, err.Error())
}

// Md5HashValue gets the md5 hash value
func Md5HashValue(log log.T, filePath string) (hash string, err error) {
	var exists = false
	exists, err = fileutil.LocalFileExist(filePath)
	if err != nil || exists == false {
		return
	}

	var f *os.File
	f, err = os.Open(filePath)
	if err != nil {
		log.Error(err)
	}
	defer f.Close()
	hasher := md5.New()
	if _, err = io.Copy(hasher, f); err != nil {
		log.Error(err)
	}
	hash = hex.EncodeToString(hasher.Sum(nil))
	log.Debugf("Hash=%v, FilePath=%v", hash, filePath)
	return
}

// killProcessOnTimeout waits for a timeout.
// When the timeout is reached, this method kills the underlying
// process of the command. This will unblock the command.Wait() call.
// If the task completed successfully this method returns with no action.
func killProcessOnTimeout(log log.T, command *exec.Cmd, timer *time.Timer) {
	<-timer.C
	log.Debug("Process exceeded timeout. Attempting to stop process.")

	// task has been exceeded the allowed execution timeout, kill process
	if err := killProcess(command.Process); err != nil {
		log.Error(err)
		return
	}

	log.Debug("Process stopped successfully")
}

func processSendReply(log log.T, messageID string, mdsService service.Service, payloadDoc messageContracts.SendReplyPayload, processorStopPolicy *sdkutil.StopPolicy) {
	payloadB, err := json.Marshal(payloadDoc)
	if err != nil {
		log.Error("could not marshal reply payload!", err)
	}
	payload := string(payloadB)
	log.Info("Sending reply ", jsonutil.Indent(payload))
	err = mdsService.SendReply(log, messageID, payload)
	if err != nil {
		sdkutil.HandleAwsError(log, err, processorStopPolicy)
	}
}

func killProcessOnTimeout(log log.T, command *exec.Cmd, timer *time.Timer) {
	<-timer.C
	log.Debug("Process exceeded timeout. Attempting to kill process!")

	// task has been exceeded the allowed execution timeout, kill process
	if err := command.Process.Kill(); err != nil {
		log.Error(err)
		return
	}

	log.Debug("Done kill process!")
}

// runCommandsRawInput executes one set of commands and returns their output.
// The input is in the default json unmarshal format (e.g. map[string]interface{}).
func (p *Plugin) runCommandsRawInput(log log.T, rawPluginInput interface{}, orchestrationDirectory string, cancelFlag task.CancelFlag, outputS3BucketName string, outputS3KeyPrefix string) (out contracts.PluginOutput) {
	var pluginInput RunCommandPluginInput
	err := jsonutil.Remarshal(rawPluginInput, &pluginInput)
	if err != nil {
		errorString := fmt.Sprintf("Invalid format in plugin properties %v;\nerror %v", rawPluginInput, err)
		out.Errors = append(out.Errors, errorString)
		out.Status = contracts.ResultStatusFailed
		log.Error(errorString)
		return
	}
	return p.runCommands(log, pluginInput, orchestrationDirectory, cancelFlag, outputS3BucketName, outputS3KeyPrefix)
}

// killProcessOnCancel waits for a cancel request.
// If a cancel request is received, this method kills the underlying
// process of the command. This will unblock the command.Wait() call.
// If the task completed successfully this method returns with no action.
func killProcessOnCancel(log log.T, command *exec.Cmd, cancelFlag task.CancelFlag) {
	cancelFlag.Wait()
	if cancelFlag.Canceled() {
		log.Debug("Process cancelled. Attempting to stop process.")

		// task has been asked to cancel, kill process
		if err := killProcess(command.Process); err != nil {
			log.Error(err)
			return
		}

		log.Debug("Process stopped successfully.")
	}
}

// RebootMachine reboots the machine
func RebootMachine(log log.T) {
	log.Info("Executing reboot request...")
	if RebootInitiated() {
		return
	}

	syncObject.Lock()
	defer syncObject.Unlock()
	if err := reboot(log); err != nil {
		log.Error("error in rebooting the machine", err)
		return
	}
	rebootInitiated = true
}

// DeleteDirectory deletes a directory and all its content.
func DeleteDirectory(log log.T, dirName string) {
	if err := os.RemoveAll(dirName); err != nil {
		log.Error("error deleting directory", err)
	}
}

// runCommands executes one set of commands and returns their output.
func (p *Plugin) runCommands(log log.T, pluginInput ApplicationPluginInput, orchestrationDirectory string, cancelFlag task.CancelFlag, outputS3BucketName string, outputS3KeyPrefix string) (out ApplicationPluginOutput) {
	var err error

	// if no orchestration directory specified, create temp directory
	var useTempDirectory = (orchestrationDirectory == "")
	var tempDir string
	if useTempDirectory {
		if tempDir, err = ioutil.TempDir("", "Ec2RunCommand"); err != nil {
			out.Errors = append(out.Errors, err.Error())
			log.Error(err)
			return
		}
		orchestrationDirectory = tempDir
	}

	orchestrationDir := fileutil.RemoveInvalidChars(filepath.Join(orchestrationDirectory, pluginInput.ID))
	log.Debugf("OrchestrationDir %v ", orchestrationDir)

	// create orchestration dir if needed
	if err = fileutil.MakeDirs(orchestrationDir); err != nil {
		log.Debug("failed to create orchestrationDir directory", orchestrationDir, err)
		out.Errors = append(out.Errors, err.Error())
		return
	}

	// Get application mode
	mode, err := getMsiApplicationMode(pluginInput)
	if err != nil {
		out.MarkAsFailed(log, err)
		return
	}
	log.Debugf("mode is %v", mode)

	// Download file from source if available
	downloadOutput, err := pluginutil.DownloadFileFromSource(log, pluginInput.Source, pluginInput.SourceHash, pluginInput.SourceHashType)
	if err != nil || downloadOutput.IsHashMatched == false || downloadOutput.LocalFilePath == "" {
		errorString := fmt.Errorf("failed to download file reliably %v", pluginInput.Source)
		out.MarkAsFailed(log, errorString)
		return
	}
	log.Debugf("local path to file is %v", downloadOutput.LocalFilePath)

	// Create msi related log file
	localSourceLogFilePath := downloadOutput.LocalFilePath + ".msiexec.log.txt"
	log.Debugf("log path is %v", localSourceLogFilePath)

	// TODO: This needs to be pulled out of this function as it runs multiple times getting initialized with the same values
	// Create output file paths
	stdoutFilePath := filepath.Join(orchestrationDir, p.StdoutFileName)
	stderrFilePath := filepath.Join(orchestrationDir, p.StderrFileName)
	log.Debugf("stdout file %v, stderr file %v", stdoutFilePath, stderrFilePath)

	// Construct Command Name and Arguments
	commandName := msiExecCommand
	commandArguments := []string{mode, downloadOutput.LocalFilePath, "/quiet", "/norestart", "/log", localSourceLogFilePath}
	if pluginInput.Parameters != "" {
		log.Debugf("Got Parameters \"%v\"", pluginInput.Parameters)
		params := processParams(log, pluginInput.Parameters)
		commandArguments = append(commandArguments, params...)
	}

	// Execute Command
	_, _, exitCode, errs := p.ExecuteCommand(log, defaultWorkingDirectory, stdoutFilePath, stderrFilePath, cancelFlag, defaultApplicationExecutionTimeoutInSeconds, commandName, commandArguments)

	// Set output status
	out.ExitCode = exitCode
	setMsiExecStatus(log, pluginInput, cancelFlag, &out)

	if len(errs) > 0 {
		for _, err := range errs {
			out.Errors = append(out.Errors, err.Error())
			log.Error("failed to run commands: ", err)
			out.Status = contracts.ResultStatusFailed
		}
		return
	}

	// Upload output to S3
	uploadOutputToS3BucketErrors := p.ExecuteUploadOutputToS3Bucket(log, pluginInput.ID, orchestrationDir, outputS3BucketName, outputS3KeyPrefix, useTempDirectory, tempDir, out.Stdout, out.Stderr)
	out.Errors = append(out.Errors, uploadOutputToS3BucketErrors...)

	// Return Json indented response
	responseContent, _ := jsonutil.Marshal(out)
	log.Debug("Returning response:\n", jsonutil.Indent(responseContent))
	return
}

// s3Download attempts to download a file via the aws sdk.
func s3Download(log log.T, amazonS3URL s3util.AmazonS3URL, destFile string) (output DownloadOutput, err error) {
	log.Debugf("attempting to download as s3 download %v", destFile)
	eTagFile := destFile + ".etag"

	config := &aws.Config{}
	var appConfig appconfig.SsmagentConfig
	appConfig, err = appconfig.Config(false)
	if err != nil {
		log.Error("failed to read appconfig.")
	} else {
		creds, err1 := appConfig.ProfileCredentials()
		if err1 != nil {
			config.Credentials = creds
		}
	}
	config.S3ForcePathStyle = aws.Bool(amazonS3URL.IsPathStyle)
	config.Region = aws.String(amazonS3URL.Region)

	params := &s3.GetObjectInput{
		Bucket: aws.String(amazonS3URL.Bucket),
		Key:    aws.String(amazonS3URL.Key),
	}

	if fileutil.Exists(destFile) == true && fileutil.Exists(eTagFile) == true {
		var existingETag string
		existingETag, err = fileutil.ReadAllText(eTagFile)
		if err != nil {
			log.Debugf("failed to read etag file %v, %v", eTagFile, err)
			return
		}
		params.IfNoneMatch = aws.String(existingETag)
	}

	s3client := s3.New(session.New(config))

	req, resp := s3client.GetObjectRequest(params)
	err = req.Send()
	if err != nil {
		if req.HTTPResponse == nil || req.HTTPResponse.StatusCode != http.StatusNotModified {
			log.Debug("failed to download from s3, ", err)
			fileutil.DeleteFile(destFile)
			fileutil.DeleteFile(eTagFile)
			return
		}

		log.Debugf("Unchanged file.")
		output.IsUpdated = false
		output.LocalFilePath = destFile
		return output, nil
	}

	if *resp.ETag != "" {
		log.Debug("files etag is ", *resp.ETag)
		err = fileutil.WriteAllText(eTagFile, *resp.ETag)
		if err != nil {
			log.Errorf("failed to write eTagfile %v, %v ", eTagFile, err)
			return
		}
	}

	defer resp.Body.Close()
	_, err = FileCopy(log, destFile, resp.Body)
	if err == nil {
		output.LocalFilePath = destFile
		output.IsUpdated = true
	} else {
		log.Errorf("failed to write destFile %v, %v ", destFile, err)
	}
	return
}

// RunCommand runs the given commands using the given working directory.
// Standard output and standard error are sent to the given writers.
func RunCommand(log log.T,
	cancelFlag task.CancelFlag,
	workingDir string,
	stdoutWriter io.Writer,
	stderrWriter io.Writer,
	executionTimeout int,
	commandName string,
	commandArguments []string,
) (exitCode int, err error) {

	command := exec.Command(commandName, commandArguments...)
	command.Dir = workingDir
	command.Stdout = stdoutWriter
	command.Stderr = stderrWriter
	exitCode = 0

	// configure OS-specific process settings
	prepareProcess(command)

	log.Debug()
	log.Debugf("Running in directory %v, command: %v %v.", workingDir, commandName, commandArguments)
	log.Debug()
	if err = command.Start(); err != nil {
		log.Error("error occurred starting the command", err)
		exitCode = 1
		return
	}

	go killProcessOnCancel(log, command, cancelFlag)

	timer := time.NewTimer(time.Duration(executionTimeout) * time.Second)
	go killProcessOnTimeout(log, command, timer)

	err = command.Wait()
	timedOut := !timer.Stop() // returns false if called previously - indicates timedOut.
	if err != nil {
		exitCode = 1
		log.Debugf("command failed to run %v", err)
		if exiterr, ok := err.(*exec.ExitError); ok {
			// The program has exited with an exit code != 0
			if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
				exitCode = status.ExitStatus()
				// First try to handle Cancel and Timeout scenarios
				// SIGKILL will result in an exitcode of -1
				if exitCode == -1 {
					if cancelFlag.Canceled() {
						// set appropriate exit code based on cancel or timeout
						exitCode = pluginutil.CommandStoppedPreemptivelyExitCode
						log.Infof("The execution of command was cancelled.")
					} else if timedOut {
						// set appropriate exit code based on cancel or timeout
						exitCode = pluginutil.CommandStoppedPreemptivelyExitCode
						log.Infof("The execution of command was timedout.")
					}
				} else {
					log.Infof("The execution of command returned Exit Status: %d", exitCode)
				}
			}
		}
	} else {
		// check if cancellation or timeout failed to kill the process
		// This will not occur as we do a SIGKILL, which is not recoverable.
		if cancelFlag.Canceled() {
			// This is when the cancellation failed and the command completed successfully
			log.Errorf("the cancellation failed to stop the process.")
			// do not return as the command could have been cancelled and also timedout
		}
		if timedOut {
			// This is when the timeout failed and the command completed successfully
			log.Errorf("the timeout failed to stop the process.")
		}
	}

	log.Debug("Done waiting!")
	return
}

// runCommands executes one set of commands and returns their output.
func (p *Plugin) runCommands(log log.T, pluginInput PSModulePluginInput, orchestrationDirectory string, cancelFlag task.CancelFlag, outputS3BucketName string, outputS3KeyPrefix string) (out PSModulePluginOutput) {
	var err error

	// if no orchestration directory specified, create temp directory
	var useTempDirectory = (orchestrationDirectory == "")
	var tempDir string
	if useTempDirectory {
		if tempDir, err = ioutil.TempDir("", "Ec2RunCommand"); err != nil {
			out.Errors = append(out.Errors, err.Error())
			log.Error(err)
			return
		}
		orchestrationDirectory = tempDir
	}

	orchestrationDir := fileutil.RemoveInvalidChars(filepath.Join(orchestrationDirectory, pluginInput.ID))
	log.Debugf("Running commands %v in workingDirectory %v; orchestrationDir %v ", pluginInput.RunCommand, pluginInput.WorkingDirectory, orchestrationDir)

	// create orchestration dir if needed
	if err = fileutil.MakeDirsWithExecuteAccess(orchestrationDir); err != nil {
		log.Debug("failed to create orchestrationDir directory", orchestrationDir)
		out.Errors = append(out.Errors, err.Error())
		return
	}

	// Create script file path
	scriptPath := filepath.Join(orchestrationDir, pluginutil.RunCommandScriptName)
	log.Debugf("Writing commands %v to file %v", pluginInput, scriptPath)

	// Create script file
	if err = pluginutil.CreateScriptFile(log, scriptPath, pluginInput.RunCommand); err != nil {
		out.Errors = append(out.Errors, err.Error())
		log.Errorf("failed to create script file. %v", err)
		return
	}

	// Download file from source if available
	downloadOutput, err := pluginutil.DownloadFileFromSource(log, pluginInput.Source, pluginInput.SourceHash, pluginInput.SourceHashType)
	if err != nil || downloadOutput.IsHashMatched == false || downloadOutput.LocalFilePath == "" {
		errorString := fmt.Errorf("failed to download file reliably %v", pluginInput.Source)
		out.MarkAsFailed(log, errorString)
		return
	} else {
		// Uncompress the zip file received
		fileutil.Uncompress(downloadOutput.LocalFilePath, PowerShellModulesDirectory)
	}

	// Set execution time
	executionTimeout := pluginutil.ValidateExecutionTimeout(log, pluginInput.TimeoutSeconds)

	// Create output file paths
	stdoutFilePath := filepath.Join(orchestrationDir, p.StdoutFileName)
	stderrFilePath := filepath.Join(orchestrationDir, p.StderrFileName)
	log.Debugf("stdout file %v, stderr file %v", stdoutFilePath, stderrFilePath)

	// Construct Command Name and Arguments
	commandName := pluginutil.GetShellCommand()
	commandArguments := append(pluginutil.GetShellArguments(), scriptPath, pluginutil.ExitCodeTrap)

	// Execute Command
	stdout, stderr, exitCode, errs := p.ExecuteCommand(log, pluginInput.WorkingDirectory, stdoutFilePath, stderrFilePath, cancelFlag, executionTimeout, commandName, commandArguments)

	// Set output status
	out.ExitCode = exitCode
	out.Status = pluginutil.GetStatus(out.ExitCode, cancelFlag)

	if len(errs) > 0 {
		for _, err := range errs {
			out.Errors = append(out.Errors, err.Error())
			if out.Status != contracts.ResultStatusCancelled &&
				out.Status != contracts.ResultStatusTimedOut &&
				out.Status != contracts.ResultStatusSuccessAndReboot {
				log.Error("failed to run commands: ", err)
				out.Status = contracts.ResultStatusFailed
			}
		}
	}

	// read (a prefix of) the standard output/error
	out.Stdout, err = pluginutil.ReadPrefix(stdout, p.MaxStdoutLength, p.OutputTruncatedSuffix)
	if err != nil {
		out.Errors = append(out.Errors, err.Error())
		log.Error(err)
	}
	out.Stderr, err = pluginutil.ReadPrefix(stderr, p.MaxStderrLength, p.OutputTruncatedSuffix)
	if err != nil {
		out.Errors = append(out.Errors, err.Error())
		log.Error(err)
	}

	// Upload output to S3
	uploadOutputToS3BucketErrors := p.ExecuteUploadOutputToS3Bucket(log, pluginInput.ID, orchestrationDir, outputS3BucketName, outputS3KeyPrefix, useTempDirectory, tempDir, out.Stdout, out.Stderr)
	out.Errors = append(out.Errors, uploadOutputToS3BucketErrors...)

	// Return Json indented response
	responseContent, _ := jsonutil.Marshal(out)
	log.Debug("Returning response:\n", jsonutil.Indent(responseContent))
	return
}