start refactoring

models/msg/pack.go

@@ -0,0 +1,69 @@
+// Copyright 2016 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package msg
+
+import (
+	"bytes"
+	"encoding/binary"
+	"encoding/json"
+	"fmt"
+	"reflect"
+
+	"github.com/fatedier/frp/utils/errors"
+)
+
+func unpack(typeByte byte, buffer []byte, msgIn Message) (msg Message, err error) {
+	if msgIn == nil {
+		t, ok := TypeMap[typeByte]
+		if !ok {
+			err = fmt.Errorf("Unsupported message type %b", typeByte)
+			return
+		}
+
+		msg = reflect.New(t).Interface().(Message)
+	} else {
+		msg = msgIn
+	}
+
+	err = json.Unmarshal(buffer, &msg)
+	return
+}
+
+func UnPackInto(buffer []byte, msg Message) (err error) {
+	_, err = unpack(' ', buffer, msg)
+	return
+}
+
+func UnPack(typeByte byte, buffer []byte) (msg Message, err error) {
+	return unpack(typeByte, buffer, nil)
+}
+
+func Pack(msg Message) ([]byte, error) {
+	typeByte, ok := TypeStringMap[reflect.TypeOf(msg).Elem()]
+	if !ok {
+		return nil, errors.ErrMsgType
+	}
+
+	content, err := json.Marshal(msg)
+	if err != nil {
+		return nil, err
+	}
+
+	buffer := bytes.NewBuffer(nil)
+	buffer.WriteByte(typeByte)
+	binary.Write(buffer, binary.BigEndian, int64(len(content)))
+	buffer.Write(content)
+	return buffer.Bytes(), nil
+}