v3 refactor (#1868)

* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>

server/mucp/rpc_request.go

@@ -0,0 +1,107 @@
+package mucp
+
+import (
+	"bytes"
+
+	"github.com/micro/go-micro/v3/codec"
+	"github.com/micro/go-micro/v3/transport"
+	"github.com/micro/go-micro/v3/util/buf"
+)
+
+type rpcRequest struct {
+	service     string
+	method      string
+	endpoint    string
+	contentType string
+	socket      transport.Socket
+	codec       codec.Codec
+	header      map[string]string
+	body        []byte
+	rawBody     interface{}
+	stream      bool
+	first       bool
+}
+
+type rpcMessage struct {
+	topic       string
+	contentType string
+	payload     interface{}
+	header      map[string]string
+	body        []byte
+	codec       codec.NewCodec
+}
+
+func (r *rpcRequest) Codec() codec.Reader {
+	return r.codec
+}
+
+func (r *rpcRequest) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcRequest) Service() string {
+	return r.service
+}
+
+func (r *rpcRequest) Method() string {
+	return r.method
+}
+
+func (r *rpcRequest) Endpoint() string {
+	return r.endpoint
+}
+
+func (r *rpcRequest) Header() map[string]string {
+	return r.header
+}
+
+func (r *rpcRequest) Body() interface{} {
+	return r.rawBody
+}
+
+func (r *rpcRequest) Read() ([]byte, error) {
+	// got a body
+	if r.first {
+		b := r.body
+		r.first = false
+		return b, nil
+	}
+
+	var msg transport.Message
+	err := r.socket.Recv(&msg)
+	if err != nil {
+		return nil, err
+	}
+	r.header = msg.Header
+
+	return msg.Body, nil
+}
+
+func (r *rpcRequest) Stream() bool {
+	return r.stream
+}
+
+func (r *rpcMessage) ContentType() string {
+	return r.contentType
+}
+
+func (r *rpcMessage) Topic() string {
+	return r.topic
+}
+
+func (r *rpcMessage) Payload() interface{} {
+	return r.payload
+}
+
+func (r *rpcMessage) Header() map[string]string {
+	return r.header
+}
+
+func (r *rpcMessage) Body() []byte {
+	return r.body
+}
+
+func (r *rpcMessage) Codec() codec.Reader {
+	b := buf.New(bytes.NewBuffer(r.body))
+	return r.codec(b)
+}