Golang Cluster.NewCommand方法代码示例

func checkEtcdVersion(cluster platform.Cluster, m platform.Machine, expected string) error {
	const (
		retries   = 5
		retryWait = 3 * time.Second
	)
	var err error
	var b []byte

	for i := 0; i < retries; i++ {
		cmd := cluster.NewCommand("curl", "-L", fmt.Sprintf("http://%v:2379/version", m.IP()))
		b, err = cmd.Output()
		if err != nil {
			plog.Infof("retrying version check, hit failure %v", err)
			time.Sleep(retryWait)
			continue
		}
		break
	}
	if err != nil {
		return fmt.Errorf("curling version: %v", err)
	}

	plog.Infof("got version: %s", b)

	if string(b) != expected {
		return fmt.Errorf("expected %v, got %s", expected, b)
	}
	return nil
}

// setKeys sets n random keys and values across each machine in a
// cluster and returns these values to later be checked with checkKeys.
// If all the values don't get set due to a machine that is down and
// error is NOT returned. An error is returned if no keys are able to be
// set.
func setKeys(cluster platform.Cluster, n int) (map[string]string, error) {
	var written = map[string]string{}
	for _, m := range cluster.Machines() {
		for i := 0; i < n; i++ {
			// random key and value, may overwrwite previous sets if
			// collision which is fine
			key := strconv.Itoa(rand.Int())[0:3]
			value := strconv.Itoa(rand.Int())[0:3]

			cmd := cluster.NewCommand("curl", "-w", "%{http_code}", "-s", fmt.Sprintf("http://%v:2379/v2/keys/%v", m.IP(), key), "-XPUT", "-d", "value="+value)
			b, err := cmd.Output()
			if err != nil {
				continue
			}

			// check for 201 or 200 resp header
			if !bytes.HasSuffix(b, []byte("200")) && !bytes.HasSuffix(b, []byte("201")) {
				continue
			}

			written[key] = value
		}
	}
	if len(written) == 0 {
		return nil, fmt.Errorf("failed to write any keys")
	}

	plog.Infof("wrote %v keys", len(written))
	return written, nil
}

func checkEtcdVersion(cluster platform.Cluster, m platform.Machine, expected string) error {
	var b []byte
	var err error

	checker := func() error {
		cmd := cluster.NewCommand("curl", "-L", fmt.Sprintf("http://%v:2379/version", m.IP()))
		b, err = cmd.Output()
		if err != nil {
			return fmt.Errorf("curl failed: %v", err)
		}

		return nil
	}

	if err := util.Retry(15, 10*time.Second, checker); err != nil {
		return err
	}

	plog.Infof("got version: %s", b)

	if string(b) != expected {
		return fmt.Errorf("expected %v, got %s", expected, b)
	}

	return nil
}

// checkKeys tests that each node in the cluster has the full provided
// key set in keyMap. Quorum get must be used.
func checkKeys(cluster platform.Cluster, keyMap map[string]string) error {
	for i, m := range cluster.Machines() {
		for k, v := range keyMap {
			cmd := cluster.NewCommand("curl", fmt.Sprintf("http://%v:2379/v2/keys/%v?quorum=true", m.IP(), k))
			b, err := cmd.Output()
			if err != nil {
				return fmt.Errorf("error curling key: %v", err)
			}

			var jsonMap map[string]interface{}
			err = json.Unmarshal(b, &jsonMap)
			if err != nil {
				return err
			}

			// error code?
			errorCode, ok := jsonMap["errorCode"]
			if ok {
				msg := jsonMap["message"]
				return fmt.Errorf("machine %v errorCode %v: %v: %s", i, errorCode, msg, b)
			}

			node, ok := jsonMap["node"]
			if !ok {
				return fmt.Errorf("retrieving key in CheckKeys, no node in resp")
			}

			n := node.(map[string]interface{})
			value, ok := n["value"]
			if !ok {
				return fmt.Errorf("retrieving key in CheckKeys, no value in resp")
			}

			if value != v {
				return fmt.Errorf("checkKeys got incorrect value! expected:%v got: %v", v, value)
			}
		}
	}
	plog.Infof("checked %v keys", len(keyMap))
	return nil
}