Golang etcd.Client类代码示例

// removeDirCommandFunc executes the "rmdir" command.
func removeDirCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]

	return client.DeleteDir(key)
}

func prepAuth(client *etcd.Client, usernameFlag string) error {
	username, password, err := getUsernamePasswordFromFlag(usernameFlag)
	if err != nil {
		return err
	}
	client.SetCredentials(username, password)
	return nil
}

// watchCommandFunc executes the "watch" command.
func watchCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	recursive := c.Bool("recursive")
	forever := c.Bool("forever")

	index := 0
	if c.Int("after-index") != 0 {
		index = c.Int("after-index") + 1
	}

	if forever {
		sigch := make(chan os.Signal, 1)
		signal.Notify(sigch, os.Interrupt)
		stop := make(chan bool)

		go func() {
			<-sigch
			os.Exit(0)
		}()

		receiver := make(chan *etcd.Response)
		errCh := make(chan error, 1)

		go func() {
			_, err := client.Watch(key, uint64(index), recursive, receiver, stop)
			errCh <- err
		}()

		for {
			select {
			case resp := <-receiver:
				printAll(resp, c.GlobalString("output"))
			case err := <-errCh:
				handleError(-1, err)
			}
		}

	} else {
		var resp *etcd.Response
		var err error
		resp, err = client.Watch(key, uint64(index), recursive, nil, nil)

		if err != nil {
			handleError(ErrorFromEtcd, err)
		}

		if err != nil {
			return nil, err
		}
		printAll(resp, c.GlobalString("output"))
	}

	return nil, nil
}

// setDirCommandFunc executes the "setDir" command.
func setDirCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	ttl := c.Int("ttl")

	return client.SetDir(key, uint64(ttl))
}

// getCommandFunc executes the "get" command.
func getCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	sorted := c.Bool("sort")

	// Retrieve the value from the server.
	return client.Get(key, sorted, false)
}

// lsCommandFunc executes the "ls" command.
func lsCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	key := "/"
	if len(c.Args()) != 0 {
		key = c.Args()[0]
	}
	recursive := c.Bool("recursive")

	// Retrieve the value from the server.
	return client.Get(key, false, recursive)
}

// makeCommandFunc executes the "make" command.
func makeCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	value, err := argOrStdin(c.Args(), os.Stdin, 1)
	if err != nil {
		return nil, errors.New("Value required")
	}

	ttl := c.Int("ttl")

	return client.Create(key, value, uint64(ttl))
}

func runSet(c *etcd.Client, setc chan set, wg *sync.WaitGroup) {
	for s := range setc {
		log.Println("copying key:", s.key)
		if s.ttl != 0 && s.ttl < 300 {
			log.Printf("extending key %s's ttl to 300 seconds", s.key)
			s.ttl = 5 * 60
		}
		_, err := c.Set(s.key, s.value, uint64(s.ttl))
		if err != nil {
			log.Fatalf("failed to copy key: %v\n", err)
		}
	}
	wg.Done()
}

// setCommandFunc executes the "set" command.
func setCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("key required")
	}
	key := c.Args()[0]
	value, err := argOrStdin(c.Args(), os.Stdin, 1)
	if err != nil {
		return nil, errors.New("value required")
	}

	ttl := c.Int("ttl")
	prevValue := c.String("swap-with-value")
	prevIndex := c.Int("swap-with-index")

	if prevValue == "" && prevIndex == 0 {
		return client.Set(key, value, uint64(ttl))
	}
	return client.CompareAndSwap(key, value, uint64(ttl), prevValue, uint64(prevIndex))
}

// getCommandFunc executes the "get" command.
func getCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	consistent := c.Bool("consistent")
	sorted := c.Bool("sort")

	// Setup consistency on the client.
	if consistent {
		client.SetConsistency(etcd.STRONG_CONSISTENCY)
	} else {
		client.SetConsistency(etcd.WEAK_CONSISTENCY)
	}

	// Retrieve the value from the server.
	return client.Get(key, sorted, false)
}

// removeCommandFunc executes the "rm" command.
func removeCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	recursive := c.Bool("recursive")
	dir := c.Bool("dir")

	// TODO: distinguish with flag is not set and empty flag
	// the cli pkg need to provide this feature
	prevValue := c.String("with-value")
	prevIndex := uint64(c.Int("with-index"))

	if prevValue != "" || prevIndex != 0 {
		return client.CompareAndDelete(key, prevValue, prevIndex)
	}

	if recursive || !dir {
		return client.Delete(key, recursive)
	}

	return client.DeleteDir(key)
}

// dumpCURL blindly dumps all curl output to os.Stderr
func dumpCURL(client *etcd.Client) {
	client.OpenCURL()
	for {
		fmt.Fprintf(os.Stderr, "Curl-Example: %s\n", client.RecvCURL())
	}
}

// execWatchCommandFunc executes the "exec-watch" command.
func execWatchCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	_ = io.Copy
	_ = exec.Command
	args := c.Args()
	argsLen := len(args)

	if argsLen < 2 {
		return nil, errors.New("Key and command to exec required")
	}

	key := args[argsLen-1]
	cmdArgs := args[:argsLen-1]

	index := 0
	if c.Int("after-index") != 0 {
		index = c.Int("after-index") + 1
		key = args[0]
		cmdArgs = args[2:]
	}

	recursive := c.Bool("recursive")
	if recursive != false {
		key = args[0]
		cmdArgs = args[2:]
	}

	sigch := make(chan os.Signal, 1)
	signal.Notify(sigch, os.Interrupt)
	stop := make(chan bool)

	go func() {
		<-sigch
		stop <- true
		os.Exit(0)
	}()

	receiver := make(chan *etcd.Response)
	client.SetConsistency(etcd.WEAK_CONSISTENCY)
	go client.Watch(key, uint64(index), recursive, receiver, stop)

	for {
		resp := <-receiver
		cmd := exec.Command(cmdArgs[0], cmdArgs[1:]...)
		cmd.Env = environResponse(resp, os.Environ())

		stdout, err := cmd.StdoutPipe()
		if err != nil {
			fmt.Fprintf(os.Stderr, err.Error())
			os.Exit(1)
		}
		stderr, err := cmd.StderrPipe()
		if err != nil {
			fmt.Fprintf(os.Stderr, err.Error())
			os.Exit(1)
		}
		err = cmd.Start()
		if err != nil {
			fmt.Fprintf(os.Stderr, err.Error())
			os.Exit(1)
		}
		go io.Copy(os.Stdout, stdout)
		go io.Copy(os.Stderr, stderr)
		cmd.Wait()
	}
}