NewStream(ctx context.Context, h HandlerID, payload []byte) (st *Stream, err error)
}

// Call the remove with the request and
func (h *StreamTypeHandler[Payload, Req, Resp]) Call(ctx context.Context, c Streamer, payload Payload) (st *TypedStream[Req, Resp], err error) {
	if c == nil {
		return nil, ErrDisconnected
	}
	var payloadB []byte
	if h.WithPayload {
		var err error

	var sub *subHandlerID
	if m.Payload == nil {
		m.Payload = GetByteBuffer()[:0]
	}
	h, err := m.UnmarshalMsg(b)
	if err != nil {
		return nil, nil, fmt.Errorf("read write: %v", err)
	}
	if len(m.Payload) == 0 && m.Flags&FlagPayloadIsZero == 0 {
		PutByteBuffer(m.Payload)
		m.Payload = nil
	}
	if m.Flags&FlagCRCxxh3 != 0 {
		const hashLen = 4

	errFatal(local.RegisterSingleHandler(handlerTest, func(payload []byte) ([]byte, *RemoteErr) {
		t.Log("1: server payload: ", len(payload), "bytes.")
		return append([]byte{}, payload...), nil
	}))
	// 2: Return as error
	errFatal(local.RegisterSingleHandler(handlerTest2, func(payload []byte) ([]byte, *RemoteErr) {
		t.Log("2: server payload: ", len(payload), "bytes.")
		err := RemoteErr(payload)
		return nil, &err
	}))

				fmt.Println("muxServer: Mux", m.ID, "send EOF", hErr)
			}
			msg.Flags |= FlagEOF
			if hErr != nil {
				msg.Flags |= FlagPayloadIsErr
				msg.Payload = []byte(*hErr)
			}
			msg.setZeroPayloadFlag()
			m.send(msg)
			return
		}
		msg.Payload = payload
		msg.setZeroPayloadFlag()
		m.send(msg)
	}
}

// handleRequests will handle the requests from the client and call the handler function.

	b.Cleanup(grid.Cleanup)
	// Create n managers.
	for _, remote := range grid.Managers {
		// Register a single handler which echos the payload.
		errFatal(remote.RegisterSingleHandler(handlerTest, func(payload []byte) ([]byte, *RemoteErr) {
			defer PutByteBuffer(payload)
			return append(GetByteBuffer()[:0], payload...), nil
		}))
		errFatal(rpc.Register(remote, func(req *testRequest) (resp *testResponse, err *RemoteErr) {
			return &testResponse{

func (c *Connection) sendMsg(conn net.Conn, msg message, payload msgp.MarshalSizer) error {
	if payload != nil {
		if sz := payload.Msgsize(); cap(msg.Payload) < sz {
			PutByteBuffer(msg.Payload)
			msg.Payload = GetByteBufferCap(sz)[:0]
		}
		var err error
		msg.Payload, err = payload.MarshalMsg(msg.Payload)
		if err != nil {
			return err
		}
		defer PutByteBuffer(msg.Payload)
	}
	dst := GetByteBufferCap(msg.Msgsize())

		PodNamespace: "funkyns",
	}

	payload, _ := json.Marshal(valid)

	addEvent, err := processAddEvent(payload)

	assert.NoError(t, err)
	assert.Equal(t, valid, addEvent)
}

func TestProcessAddEventBadPayload(t *testing.T) {
	valid := CNIPluginAddEvent{
		Netns:        "/var/netns/foo",
		PodName:      "pod-bingo",
		PodNamespace: "funkyns",
	}

	payload, _ := json.Marshal(valid)

	errFatal(local.RegisterSingleHandler(handlerTest, func(payload []byte) ([]byte, *RemoteErr) {
		t.Log("1: server payload: ", len(payload), "bytes.")
		return append([]byte{}, payload...), nil
	}))
	// 2: Return as error
	errFatal(local.RegisterSingleHandler(handlerTest2, func(payload []byte) ([]byte, *RemoteErr) {
		t.Log("2: server payload: ", len(payload), "bytes.")
		err := RemoteErr(payload)
		return nil, &err
	}))

			need = int(math.Min(float64(b-hdr), float64(need))) // use remaining tokens towards payload
			tokens = need + hdr

		} else { // part of header can be accommodated
			r.opts.HeaderSize -= b - 1
			need = 1 // to ensure we read at least one byte for every Read
			tokens = b
		}
	} else { // all tokens go towards payload
		need = int(math.Min(float64(b), float64(need)))
		tokens = need
	}

		return
	}

	// Route directly to output.
	m.respWait = out
}

// RequestStream will send a single payload request and stream back results.
// 'requests' can be nil, in which case only req is sent as input.
// It will however take less resources.
func (m *muxClient) RequestStream(h HandlerID, payload []byte, requests chan []byte, responses chan Response) (*Stream, error) {
	if m.init {