Golang fmt.Errorf函數代碼示例

func validateMounts(mounts []api.Mount) error {
	for _, mount := range mounts {
		// Target must always be absolute
		if !filepath.IsAbs(mount.Target) {
			return fmt.Errorf("invalid mount target, must be an absolute path: %s", mount.Target)
		}

		switch mount.Type {
		// The checks on abs paths are required due to the container API confusing
		// volume mounts as bind mounts when the source is absolute (and vice-versa)
		// See #25253
		// TODO: This is probably not neccessary once #22373 is merged
		case api.MountTypeBind:
			if !filepath.IsAbs(mount.Source) {
				return fmt.Errorf("invalid bind mount source, must be an absolute path: %s", mount.Source)
			}
		case api.MountTypeVolume:
			if filepath.IsAbs(mount.Source) {
				return fmt.Errorf("invalid volume mount source, must not be an absolute path: %s", mount.Source)
			}
		case api.MountTypeTmpfs:
			if mount.Source != "" {
				return fmt.Errorf("invalid tmpfs source, source must be empty")
			}
		default:
			return fmt.Errorf("invalid mount type: %s", mount.Type)
		}
	}
	return nil
}

func (p *authV1JsonParser) parse(config *Config, raw []byte) error {
	var auth authV1
	if err := json.Unmarshal(raw, &auth); err != nil {
		return err
	}
	if len(auth.Domains) == 0 {
		return fmt.Errorf("no domains specified")
	}
	if len(auth.Type) == 0 {
		return fmt.Errorf("no auth type specified")
	}
	var (
		err      error
		headerer Headerer
	)
	switch auth.Type {
	case "basic":
		headerer, err = p.getBasicV1Headerer(auth.Credentials)
	case "oauth":
		headerer, err = p.getOAuthV1Headerer(auth.Credentials)
	default:
		err = fmt.Errorf("unknown auth type: %q", auth.Type)
	}
	if err != nil {
		return err
	}
	for _, domain := range auth.Domains {
		if _, ok := config.AuthPerHost[domain]; ok {
			return fmt.Errorf("auth for domain %q is already specified", domain)
		}
		config.AuthPerHost[domain] = headerer
	}
	return nil
}

func ExampleV_Validate() {
	type X struct {
		A string `validate:"long"`
		B string `validate:"short"`
		C string `validate:"long,short"`
		D string
	}

	vd := make(V)
	vd["long"] = func(i interface{}) error {
		s := i.(string)
		if len(s) < 5 {
			return fmt.Errorf("%q is too short", s)
		}
		return nil
	}
	vd["short"] = func(i interface{}) error {
		s := i.(string)
		if len(s) >= 5 {
			return fmt.Errorf("%q is too long", s)
		}
		return nil
	}

	fmt.Println(vd.Validate(X{
		A: "hello there",
		B: "hi",
		C: "help me",
		D: "I am not validated",
	}))

	// Output: [field C is invalid: "help me" is too long]
}

func (daemon *Daemon) reserveName(id, name string) (string, error) {
	if !validContainerNamePattern.MatchString(name) {
		return "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
	}

	if name[0] != '/' {
		name = "/" + name
	}

	if _, err := daemon.containerGraph.Set(name, id); err != nil {
		if !graphdb.IsNonUniqueNameError(err) {
			return "", err
		}

		conflictingContainer, err := daemon.GetByName(name)
		if err != nil {
			if strings.Contains(err.Error(), "Could not find entity") {
				return "", err
			}

			// Remove name and continue starting the container
			if err := daemon.containerGraph.Delete(name); err != nil {
				return "", err
			}
		} else {
			nameAsKnownByUser := strings.TrimPrefix(name, "/")
			return "", fmt.Errorf(
				"Conflict. The name %q is already in use by container %s. You have to remove (or rename) that container to be able to reuse that name.", nameAsKnownByUser,
				stringid.TruncateID(conflictingContainer.ID))
		}
	}
	return name, nil
}

func deleteLocalSubnetRoute(device, localSubnetCIDR string) {
	backoff := utilwait.Backoff{
		Duration: 100 * time.Millisecond,
		Factor:   1.25,
		Steps:    6,
	}
	err := utilwait.ExponentialBackoff(backoff, func() (bool, error) {
		itx := ipcmd.NewTransaction(kexec.New(), device)
		routes, err := itx.GetRoutes()
		if err != nil {
			return false, fmt.Errorf("could not get routes: %v", err)
		}
		for _, route := range routes {
			if strings.Contains(route, localSubnetCIDR) {
				itx.DeleteRoute(localSubnetCIDR)
				err = itx.EndTransaction()
				if err != nil {
					return false, fmt.Errorf("could not delete route: %v", err)
				}
				return true, nil
			}
		}
		return false, nil
	})

	if err != nil {
		glog.Errorf("Error removing %s route from dev %s: %v; if the route appears later it will not be deleted.", localSubnetCIDR, device, err)
	}
}

func getAppID(client *http.Client, url string) (string, error) {
	// Generate a pseudo-random token for handshaking.
	token := strconv.Itoa(rand.New(rand.NewSource(time.Now().UnixNano())).Int())

	resp, err := client.Get(fmt.Sprintf("%s?rtok=%s", url, token))
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	body, err := ioutil.ReadAll(resp.Body)
	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("bad response %d; body: %q", resp.StatusCode, body)
	}
	if err != nil {
		return "", fmt.Errorf("failed reading response: %v", err)
	}

	// Check the token is present in response.
	if !bytes.Contains(body, []byte(token)) {
		return "", fmt.Errorf("token not found: want %q; body %q", token, body)
	}

	match := appIDRE.FindSubmatch(body)
	if match == nil {
		return "", fmt.Errorf("app ID not found: body %q", body)
	}

	return string(match[1]), nil
}

func GetStringParam(m map[string]interface{}, p string, required bool) (string, bool, error) {
	v, have := m[p]
	if !have {
		if required {
			return "", false, fmt.Errorf("Parameter %s missing", p)
		}
		return "", false, nil
	}
	switch v.(type) {
	case string:
		return v.(string), true, nil
	case []interface{}:
		var acc string
		for _, x := range v.([]interface{}) {
			switch x.(type) {
			case string:
				acc += x.(string)
			default:
				return "", true, fmt.Errorf("Parameter %s type %T wrong at %v %T", p, v, x, x)
			}
		}
		return acc, true, nil
	default:
		return "", true, fmt.Errorf("Parameter %s type %T wrong", p, v)
	}
}

// 獲取客服圖像的大小, 如果客服沒有圖像則返回 ErrNoHeadImage 錯誤.
func (info *KfInfo) HeadImageSize() (size int, err error) {
	HeadImageURL := info.HeadImageURL
	if HeadImageURL == "" {
		err = ErrNoHeadImage
		return
	}

	lastSlashIndex := strings.LastIndex(HeadImageURL, "/")
	if lastSlashIndex == -1 {
		err = fmt.Errorf("invalid HeadImageURL: %s", HeadImageURL)
		return
	}
	HeadImageIndex := lastSlashIndex + 1
	if HeadImageIndex == len(HeadImageURL) {
		err = fmt.Errorf("invalid HeadImageURL: %s", HeadImageURL)
		return
	}

	sizeStr := HeadImageURL[HeadImageIndex:]

	size, err = strconv.Atoi(sizeStr)
	if err != nil {
		err = fmt.Errorf("invalid HeadImageURL: %s", HeadImageURL)
		return
	}

	if size == 0 {
		size = 640
	}
	return
}

func (ctrl *Controller) authorizeKey(conn ssh.ConnMetadata, key ssh.PublicKey) (
	*ssh.Permissions, error) {

	marshaledKey := key.Marshal()
	for _, authorizedKey := range ctrl.authorizedKeys {
		if bytes.Compare(authorizedKey.Marshal(), marshaledKey) == 0 {
			return &ssh.Permissions{}, nil
		}
	}

	nodes, err := ctrl.cluster.GetDir("console/authorized_keys")
	if err != nil {
		if err == cluster.ErrNotFound {
			return nil, fmt.Errorf("unauthorized")
		}
		return nil, err
	}

	for path, value := range nodes {
		key, _, _, _, err := ssh.ParseAuthorizedKey([]byte(value))
		if err != nil {
			fmt.Printf("bad authorized key from etcd: %s: %s\n", path, err)
		}
		if bytes.Compare(key.Marshal(), marshaledKey) == 0 {
			return &ssh.Permissions{}, nil
		}
	}

	return nil, fmt.Errorf("unauthorized")
}

func (ctrl *Controller) AddHostKeyFromCluster(host string) error {
	generate := func() (string, error) {
		// Generate an ECDSA key.
		key, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
		if err != nil {
			return "", err
		}
		derBytes, err := x509.MarshalECPrivateKey(key)
		if err != nil {
			return "", err
		}
		w := &bytes.Buffer{}
		if err := pem.Encode(w, &pem.Block{Type: "EC PRIVATE KEY", Bytes: derBytes}); err != nil {
			return "", err
		}
		return w.String(), nil
	}
	pemString, err := ctrl.cluster.GetValueWithDefault(fmt.Sprintf("console/%s", host), generate)
	if err != nil {
		return fmt.Errorf("failed to get/generate host key: %s", err)
	}

	signer, err := ssh.ParsePrivateKey([]byte(pemString))
	if err != nil {
		return fmt.Errorf("failed to parse host key: %s", err)
	}

	ctrl.config.AddHostKey(signer)
	return nil
}

// InitIssueWithMetaAndFields returns Issue with with values from fieldsConfig properly set.
//  * metaProject should contain metaInformation about the project where the issue should be created.
//  * metaIssuetype is the MetaInformation about the Issuetype that needs to be created.
//  * fieldsConfig is a key->value pair where key represents the name of the field as seen in the UI
// 		And value is the string value for that particular key.
// Note: This method doesn't verify that the fieldsConfig is complete with mandatory fields. The fieldsConfig is
//		 supposed to be already verified with MetaIssueType.CheckCompleteAndAvailable. It will however return
//		 error if the key is not found.
//		 All values will be packed into Unknowns. This is much convenient. If the struct fields needs to be
//		 configured as well, marshalling and unmarshalling will set the proper fields.
func InitIssueWithMetaAndFields(metaProject *MetaProject, metaIssuetype *MetaIssueType, fieldsConfig map[string]string) (*Issue, error) {
	issue := new(Issue)
	issueFields := new(IssueFields)
	issueFields.Unknowns = tcontainer.NewMarshalMap()

	// map the field names the User presented to jira's internal key
	allFields, _ := metaIssuetype.GetAllFields()
	for key, value := range fieldsConfig {
		jiraKey, found := allFields[key]
		if !found {
			return nil, fmt.Errorf("Key %s is not found in the list of fields.", key)
		}

		valueType, err := metaIssuetype.Fields.String(jiraKey + "/schema/type")
		if err != nil {
			return nil, err
		}
		switch valueType {
		case "array":
			elemType, err := metaIssuetype.Fields.String(jiraKey + "/schema/items")
			if err != nil {
				return nil, err
			}
			switch elemType {
			case "component":
				issueFields.Unknowns[jiraKey] = []Component{Component{Name: value}}
			default:
				issueFields.Unknowns[jiraKey] = []string{value}
			}
		case "string":
			issueFields.Unknowns[jiraKey] = value
		case "date":
			issueFields.Unknowns[jiraKey] = value
		case "any":
			// Treat any as string
			issueFields.Unknowns[jiraKey] = value
		case "project":
			issueFields.Unknowns[jiraKey] = Project{
				Name: metaProject.Name,
				ID:   metaProject.Id,
			}
		case "priority":
			issueFields.Unknowns[jiraKey] = Priority{Name: value}
		case "user":
			issueFields.Unknowns[jiraKey] = User{
				Name: value,
			}
		case "issuetype":
			issueFields.Unknowns[jiraKey] = IssueType{
				Name: value,
			}
		default:
			return nil, fmt.Errorf("Unknown issue type encountered: %s for %s", valueType, key)
		}
	}

	issue.Fields = issueFields

	return issue, nil
}

// handleConn processes conn. This is run in a separate goroutine.
func (s *Service) handleConn(conn net.Conn) error {
	// Read request from connection.
	req, err := s.readRequest(conn)
	if err != nil {
		return fmt.Errorf("read request: %s", err)
	}

	// Retrieve shard.
	sh := s.TSDBStore.Shard(req.GetShardID())

	// Return error response if the shard doesn't exist.
	if sh == nil {
		if err := s.writeResponse(conn, &internal.Response{
			Error: proto.String(fmt.Sprintf("shard not found: id=%d", req.GetShardID())),
		}); err != nil {
			return fmt.Errorf("write error response: %s", err)
		}
		return nil
	}

	// Write successful response.
	if err := s.writeResponse(conn, &internal.Response{}); err != nil {
		return fmt.Errorf("write response: %s", err)
	}

	// Write shard to response.
	if _, err := sh.WriteTo(conn); err != nil {
		return fmt.Errorf("write shard: %s", err)
	}

	return nil
}

// ShardReader returns a reader for streaming shard data.
// Returned ReadCloser must be closed by the caller.
func (c *Client) ShardReader(id uint64) (io.ReadCloser, error) {
	// Connect to remote server.
	conn, err := tcp.Dial("tcp", c.host, MuxHeader)
	if err != nil {
		return nil, err
	}

	// Send request to server.
	if err := c.writeRequest(conn, &internal.Request{ShardID: proto.Uint64(id)}); err != nil {
		return nil, fmt.Errorf("write request: %s", err)
	}

	// Read response from the server.
	resp, err := c.readResponse(conn)
	if err != nil {
		return nil, fmt.Errorf("read response: %s", err)
	}

	// If there was an error then return it and close connection.
	if resp.GetError() != "" {
		conn.Close()
		return nil, errors.New(resp.GetError())
	}

	// Returning remaining stream for caller to consume.
	return conn, nil
}

func LoadImage(root string) (*Image, error) {
	// Load the json data
	jsonData, err := ioutil.ReadFile(jsonPath(root))
	if err != nil {
		return nil, err
	}
	var img Image
	if err := json.Unmarshal(jsonData, &img); err != nil {
		return nil, err
	}
	if err := ValidateId(img.Id); err != nil {
		return nil, err
	}
	// Check that the filesystem layer exists
	if stat, err := os.Stat(layerPath(root)); err != nil {
		if os.IsNotExist(err) {
			return nil, fmt.Errorf("Couldn't load image %s: no filesystem layer", img.Id)
		} else {
			return nil, err
		}
	} else if !stat.IsDir() {
		return nil, fmt.Errorf("Couldn't load image %s: %s is not a directory", img.Id, layerPath(root))
	}
	return &img, nil
}

func getScheduler(st settings, demandUpdate chan struct{}) (scheduler.Scheduler, error) {
	var s scheduler.Scheduler

	switch st.schedulerType {
	case "DOCKER":
		log.Info("Scheduling with Docker remote API")
		s = docker.NewScheduler(st.pullImages, st.dockerHost)
	case "MARATHON":
		log.Info("Scheduling with Mesos / Marathon")
		s = marathon.NewScheduler(st.marathonAPI, demandUpdate)
	case "ECS":
		return nil, fmt.Errorf("Scheduling with ECS not yet supported. Tweet with hashtag #MicroscaleECS if you'd like us to add this next!")
	case "KUBERNETES":
		return nil, fmt.Errorf("Scheduling with Kubernetes not yet supported. Tweet with hashtag #MicroscaleK8S if you'd like us to add this next!")
	case "NOMAD":
		return nil, fmt.Errorf("Scheduling with Nomad not yet supported. Tweet with hashtag #MicroscaleNomad if you'd like us to add this next!")
	case "TOY":
		log.Info("Scheduling with toy scheduler")
		s = toy.NewScheduler()
	default:
		return nil, fmt.Errorf("Bad value for MSS_SCHEDULER: %s", st.schedulerType)
	}

	if s == nil {
		return nil, fmt.Errorf("No scheduler")
	}

	return s, nil
}