コード例 #1
0
ファイル: process.go プロジェクト: n1rvana/flynn
// ping executes a PING command against addr until timeout occurs.
func (p *Process) ping(addr string, timeout time.Duration) error {
	// Default to local process if addr not specified.
	if addr == "" {
		addr = fmt.Sprintf("localhost:%s", p.Port)
	}

	logger := p.Logger.New("fn", "ping", "addr", addr, "timeout", timeout)
	logger.Info("sending")

	timer := time.NewTimer(timeout)
	defer timer.Stop()

	ticker := time.NewTicker(checkInterval)
	defer ticker.Stop()

	for {
		// Attempt to ping the server.
		if ok := func() bool {
			logger.Info("sending PING")

			conn, err := redis.Dial("tcp", addr,
				redis.DialPassword(p.Password),
				redis.DialConnectTimeout(timeout),
				redis.DialReadTimeout(timeout),
				redis.DialWriteTimeout(timeout),
			)
			if err != nil {
				logger.Error("conn error", "err", err)
				return false
			}
			defer conn.Close()

			if _, err := conn.Do("PING"); err != nil {
				logger.Error("error getting upstream status", "err", err)
				return false
			}

			logger.Info("PONG received")
			return true
		}(); ok {
			return nil
		}

		select {
		case <-timer.C:
			logger.Info("timeout")
			return ErrTimeout
		case <-ticker.C:
		}
	}
}
コード例 #2
0
ファイル: process.go プロジェクト: n1rvana/flynn
// RedisInfo executes an INFO command against a Redis server and returns the results.
func (p *Process) RedisInfo(addr string, timeout time.Duration) (*RedisInfo, error) {
	// Default to local process if addr not specified.
	if addr == "" {
		addr = fmt.Sprintf("localhost:%s", p.Port)
	}

	logger := p.Logger.New("fn", "replInfo", "addr", addr)
	logger.Info("sending INFO")

	// Connect to the redis server.
	conn, err := redis.Dial("tcp", addr,
		redis.DialPassword(p.Password),
		redis.DialConnectTimeout(timeout),
		redis.DialReadTimeout(timeout),
		redis.DialWriteTimeout(timeout),
	)
	if err != nil {
		logger.Info("dial error", "err", err)
		return nil, err
	}
	defer conn.Close()

	// Execute INFO command.
	reply, err := conn.Do("INFO")
	if err != nil {
		logger.Error("info error", "err", err)
		return nil, err
	}

	buf, ok := reply.([]byte)
	if !ok {
		logger.Error("info reply type error", "type", fmt.Sprintf("%T", buf))
		return nil, fmt.Errorf("unexpected INFO reply format: %T", buf)
	}

	// Parse the bulk string reply info a typed object.
	info, err := ParseRedisInfo(string(buf))
	if err != nil {
		logger.Error("parse info error", "err", err)
		return nil, fmt.Errorf("parse info: %s", err)
	}

	logger.Info("INFO received")
	return info, nil
}