return false, err
	}
	return target.isActive()
}

func (target *RedisTarget) isActive() (bool, error) {
	conn := target.pool.Get()
	defer conn.Close()

	_, pingErr := conn.Do("PING")
	if pingErr != nil {
		if xnet.IsConnRefusedErr(pingErr) {
			return false, store.ErrNotConnected
		}
		return false, pingErr
	}
	return true, nil
}

	if m.outBlock == nil {
		// Closed
		return
	}
	select {
	case m.outBlock <- struct{}{}:
	default:
		gridLogIf(m.ctx, errors.New("output unblocked overflow"))
	}
}

func (m *muxServer) ping(seq uint32) pongMsg {
	if !m.checkSeq(seq) {
		msg := fmt.Sprintf("receive sequence number mismatch. want %d, got %d", m.RecvSeq, seq)
		return pongMsg{Err: &msg}
	}
	select {
	case <-m.ctx.Done():

tls                               (on|off)    set to 'on' to enable TLS
tls_skip_verify                   (on|off)    trust server TLS without verification, defaults to "on" (verify)
ping_interval                     (duration)  client ping commands interval in s,m,h,d. Disabled by default
streaming                         (on|off)    set to 'on', to use streaming NATS server

			Optional:    true,
			Type:        "on|off",
		},
		config.HelpKV{
			Key:         target.NATSPingInterval,
			Description: "client ping commands interval in s,m,h,d. Disabled by default",
			Optional:    true,
			Type:        "duration",
		},
		config.HelpKV{
			Key:         target.NATSCertAuthority,

	if err := target.init(); err != nil {
		return false, err
	}
	return target.isActive()
}

func (target *MySQLTarget) isActive() (bool, error) {
	if err := target.db.Ping(); err != nil {
		if IsConnErr(err) {
			return false, store.ErrNotConnected
		}
		return false, err
	}
	return true, nil
}

	biggerBufMin = 32 << 10

	// This is the maximum size of bigger buffers.
	biggerBufMax = maxBufferSize

	// If there is a queue, merge up to this many messages.
	maxMergeMessages = 30

	// clientPingInterval will ping the remote handler every 15 seconds.
	// Clients disconnect when we exceed 2 intervals.
	clientPingInterval = 15 * time.Second

	// Deadline for single (non-streaming) requests to complete.

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	// 		// ReadIdleTimeout is the timeout after which a health check using ping
	// 		// frame will be carried out if no frame is received on the
	// 		// connection. 5 minutes is sufficient time for any idle connection.
	// 		trhttp2.ReadIdleTimeout = 5 * time.Minute
	// 		// PingTimeout is the timeout after which the connection will be closed
	// 		// if a response to Ping is not received.
	// 		trhttp2.PingTimeout = dialTimeout

const (
	// OpConnect is a connect request.
	OpConnect Op = iota + 1

	// OpConnectResponse is a response to a connect request.
	OpConnectResponse

	// OpPing is a ping request.
	// If a mux id is specified that mux is pinged.
	// Clients send ping requests.
	OpPing

	// OpPong is a OpPing response returned by the server.
	OpPong

	// OpConnectMux will connect a new mux with optional payload.
	OpConnectMux

	if err := target.init(); err != nil {
		return false, err
	}
	return target.isActive()
}

func (target *PostgreSQLTarget) isActive() (bool, error) {
	if err := target.db.Ping(); err != nil {
		if IsConnErr(err) {
			return false, store.ErrNotConnected
		}
		return false, err
	}
	return true, nil
}