Golang errors.New函數代碼示例

func (m linuxMounter) shouldMount(partitionPath, mountPoint string) (shouldMount bool, err error) {
	isMounted, err := m.searchMounts(func(mountedPartitionPath, mountedMountPoint string) (found bool, err error) {
		switch {
		case mountedPartitionPath == partitionPath && mountedMountPoint == mountPoint:
			found = true
			return
		case mountedPartitionPath == partitionPath && mountedMountPoint != mountPoint:
			err = bosherr.New("Device %s is already mounted to %s, can't mount to %s",
				mountedPartitionPath, mountedMountPoint, mountPoint)
			return
		case mountedMountPoint == mountPoint:
			err = bosherr.New("Device %s is already mounted to %s, can't mount %s",
				mountedPartitionPath, mountedMountPoint, partitionPath)
			return
		}

		return
	})
	if err != nil {
		err = bosherr.WrapError(err, "Searching mounts")
		return
	}

	shouldMount = !isMounted
	return
}

func NewWatchTimeFromString(str string) (WatchTime, error) {
	var watchTime WatchTime

	parts := strings.Split(str, "-")
	if len(parts) != 2 {
		return watchTime, bosherr.New("Invalid watch time range %s", str)
	}

	min, err := strconv.Atoi(strings.Trim(parts[0], " "))
	if err != nil {
		return watchTime, bosherr.WrapError(
			err, "Non-positive number as watch time minimum %s", parts[0])
	}

	max, err := strconv.Atoi(strings.Trim(parts[1], " "))
	if err != nil {
		return watchTime, bosherr.WrapError(
			err, "Non-positive number as watch time maximum %s", parts[1])
	}

	if max < min {
		return watchTime, bosherr.New(
			"Watch time must have maximum greater than or equal minimum %s", str)
	}

	watchTime[0], watchTime[1] = min, max

	return watchTime, nil
}

func (r defaultNetworkResolver) GetDefaultNetwork() (boshsettings.Network, error) {
	network := boshsettings.Network{}

	routes, err := r.routesSearcher.SearchRoutes()
	if err != nil {
		return network, bosherr.WrapError(err, "Searching routes")
	}

	if len(routes) == 0 {
		return network, bosherr.New("No routes found")
	}

	for _, route := range routes {
		if !route.IsDefault() {
			continue
		}

		ip, err := r.ipResolver.GetPrimaryIPv4(route.InterfaceName)
		if err != nil {
			return network, bosherr.WrapError(
				err, "Getting primary IPv4 for interface '%s'", route.InterfaceName)
		}

		return boshsettings.Network{
			IP:      ip.IP.String(),
			Netmask: gonet.IP(ip.Mask).String(),
			Gateway: route.Gateway,
		}, nil

	}

	return network, bosherr.New("Failed to find default route")
}

func (v SyntaxValidator) Validate() error {
	if v.release.Name == "" {
		return bosherr.New("Missing release name")
	}

	if v.release.Version == "" {
		return bosherr.New("Missing release version")
	}

	if v.release.CommitHash == "" {
		return bosherr.New("Missing release commit_hash")
	}

	for i, job := range v.release.Jobs {
		err := v.validateJob(&v.release.Jobs[i])
		if err != nil {
			return bosherr.WrapError(err, "Job %s (%d)", job.Name, i)
		}
	}

	for i, pkg := range v.release.Packages {
		err := v.validatePkg(&v.release.Packages[i])
		if err != nil {
			return bosherr.WrapError(err, "Package %s (%d)", pkg.Name, i)
		}
	}

	return nil
}

func (r concreteRunner) Run(action Action, payloadBytes []byte) (value interface{}, err error) {
	payloadArgs, err := r.extractJsonArguments(payloadBytes)
	if err != nil {
		err = bosherr.WrapError(err, "Extracting json arguments")
		return
	}

	actionValue := reflect.ValueOf(action)
	runMethodValue := actionValue.MethodByName("Run")
	if runMethodValue.Kind() != reflect.Func {
		err = bosherr.New("Run method not found")
		return
	}

	runMethodType := runMethodValue.Type()
	if r.invalidReturnTypes(runMethodType) {
		err = bosherr.New("Run method should return a value and an error")
		return
	}

	methodArgs, err := r.extractMethodArgs(runMethodType, payloadArgs)
	if err != nil {
		err = bosherr.WrapError(err, "Extracting method arguments from payload")
		return
	}

	values := runMethodValue.Call(methodArgs)
	return r.extractReturns(values)
}

func (r ipResolver) GetPrimaryIPv4(interfaceName string) (*gonet.IPNet, error) {
	addrs, err := r.ifaceToAddrsFunc(interfaceName)
	if err != nil {
		return nil, bosherr.WrapError(err, "Looking up addresses for interface '%s'", interfaceName)
	}

	if len(addrs) == 0 {
		return nil, bosherr.New("No addresses found for interface '%s'", interfaceName)
	}

	for _, addr := range addrs {
		ip, ok := addr.(*gonet.IPNet)
		if !ok {
			continue
		}

		// ignore ipv6
		if ip.IP.To4() == nil {
			continue
		}

		return ip, nil
	}

	return nil, bosherr.New("Failed to find primary IPv4 address for interface '%s'", interfaceName)
}

func (v SyntaxValidator) validateJob(job *Job) error {
	if job.Name == "" {
		return bosherr.New("Missing job name")
	}

	if job.Template != nil {
		return bosherr.New("'template' is deprecated in favor of 'templates'")
	}

	err := v.validateUpdate(&job.Update)
	if err != nil {
		return bosherr.WrapError(err, "Update")
	}

	props, err := bputil.NewStringKeyed().ConvertMap(job.PropertiesRaw)
	if err != nil {
		return bosherr.WrapError(err, "Properties")
	}

	job.Properties = props

	for i, na := range job.NetworkAssociations {
		err := v.validateNetworkAssociation(&job.NetworkAssociations[i])
		if err != nil {
			return bosherr.WrapError(err, "Network association %s (%d)", na.NetworkName, i)
		}
	}

	return nil
}

func (tc ConcreteTemplatesCompiler) buildJobReaders(job bpdep.Job) ([]jobReader, error) {
	var readers []jobReader

	for _, template := range job.Templates {
		rec, found, err := tc.tplToJobRepo.FindByTemplate(template)
		if err != nil {
			return readers, bosherr.WrapError(err, "Finding dep-template -> release-job record %s", template.Name)
		} else if !found {
			return readers, bosherr.New("Expected to find dep-template -> release-job record %s", template.Name)
		}

		jobRec, found, err := tc.jobsRepo.FindByReleaseJob(rec)
		if err != nil {
			return readers, bosherr.WrapError(err, "Finding job source blob %s", template.Name)
		} else if !found {
			return readers, bosherr.New("Expected to find job source blob %s -- %s", template.Name, rec)
		}

		jobURL := fmt.Sprintf("blobstore:///%s?fingerprint=%s", jobRec.BlobID, jobRec.SHA1)

		reader := jobReader{
			rec:       rec,
			tarReader: tc.jobReaderFactory.NewTarReader(jobURL),
		}

		readers = append(readers, reader)
	}

	return readers, nil
}

func (a DrainAction) Run(drainType DrainType, newSpecs ...boshas.V1ApplySpec) (int, error) {
	currentSpec, err := a.specService.Get()
	if err != nil {
		return 0, bosherr.WrapError(err, "Getting current spec")
	}

	if len(currentSpec.JobSpec.Template) == 0 {
		if drainType == DrainTypeStatus {
			return 0, bosherr.New("Check Status on Drain action requires job spec")
		} else {
			return 0, nil
		}
	}

	err = a.jobSupervisor.Unmonitor()
	if err != nil {
		return 0, bosherr.WrapError(err, "Unmonitoring services")
	}

	drainScript := a.drainScriptProvider.NewDrainScript(currentSpec.JobSpec.Template)

	var params boshdrain.DrainScriptParams

	switch drainType {
	case DrainTypeUpdate:
		if len(newSpecs) == 0 {
			return 0, bosherr.New("Drain update requires new spec")
		}

		params = boshdrain.NewUpdateDrainParams(currentSpec, newSpecs[0])

	case DrainTypeShutdown:
		err = a.notifier.NotifyShutdown()
		if err != nil {
			return 0, bosherr.WrapError(err, "Notifying shutdown")
		}

		params = boshdrain.NewShutdownDrainParams()

	case DrainTypeStatus:
		params = boshdrain.NewStatusDrainParams()
	}

	if !drainScript.Exists() {
		if drainType == DrainTypeStatus {
			return 0, bosherr.New("Check Status on Drain action requires a valid drain script")
		} else {
			return 0, nil
		}
	}

	value, err := drainScript.Run(params)
	if err != nil {
		return 0, bosherr.WrapError(err, "Running Drain Script")
	}

	return value, nil
}

func (s *FileBundleCollection) checkBundle(bundle Bundle) error {
	if len(bundle.BundleName()) == 0 {
		return bosherr.New("missing bundle name")
	}
	if len(bundle.BundleVersion()) == 0 {
		return bosherr.New("missing bundle version")
	}
	return nil
}

func (s *FileBundleCollection) checkBundle(bundle Bundle) (err error) {
	if len(bundle.BundleName()) == 0 {
		err = bosherr.New("missing bundle name")
		return
	}
	if len(bundle.BundleVersion()) == 0 {
		err = bosherr.New("missing bundle version")
		return
	}
	return
}

func (v SemanticValidator) validateNetworkAssociation(na NetworkAssociation) error {
	if na.Network == nil {
		return bosherr.New("Missing associated network")
	}

	if na.MustHaveStaticIP && na.StaticIP == nil {
		return bosherr.New("Missing static IP assignment")
	}

	return nil
}

func (v SyntaxValidator) validateNetworkType(networkType string) error {
	if networkType == "" {
		return bosherr.New("Missing network type")
	}

	for _, t := range NetworkTypes {
		if networkType == t {
			return nil
		}
	}

	return bosherr.New("Unknown network type %s", networkType)
}

func (blobstore local) Validate() error {
	path, found := blobstore.options["blobstore_path"]
	if !found {
		return bosherr.New("missing blobstore_path")
	}

	_, ok := path.(string)
	if !ok {
		return bosherr.New("blobstore_path must be a string")
	}

	return nil
}

func (bc FileBundleCollection) Get(definition BundleDefinition) (Bundle, error) {
	if len(definition.BundleName()) == 0 {
		return nil, bosherr.New("Missing bundle name")
	}

	if len(definition.BundleVersion()) == 0 {
		return nil, bosherr.New("Missing bundle version")
	}

	installPath := filepath.Join(bc.installPath, bc.name, definition.BundleName(), definition.BundleVersion())
	enablePath := filepath.Join(bc.enablePath, bc.name, definition.BundleName())
	return NewFileBundle(installPath, enablePath, bc.fs, bc.logger), nil
}