start refactoring

models/msg/process.go

@@ -0,0 +1,88 @@
+// 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 (
+	"encoding/binary"
+	"fmt"
+	"io"
+)
+
+var (
+	MaxMsgLength int64 = 10240
+)
+
+func readMsg(c io.Reader) (typeByte byte, buffer []byte, err error) {
+	buffer = make([]byte, 1)
+	_, err = c.Read(buffer)
+	if err != nil {
+		return
+	}
+	typeByte = buffer[0]
+	if _, ok := TypeMap[typeByte]; !ok {
+		err = fmt.Errorf("Message type error")
+		return
+	}
+
+	var length int64
+	err = binary.Read(c, binary.BigEndian, &length)
+	if err != nil {
+		return
+	}
+	if length > MaxMsgLength {
+		err = fmt.Errorf("Message length exceed the limit")
+		return
+	}
+
+	buffer = make([]byte, length)
+	n, err := io.ReadFull(c, buffer)
+	if err != nil {
+		return
+	}
+
+	if int64(n) != length {
+		err = fmt.Errorf("Message format error")
+	}
+	return
+}
+
+func ReadMsg(c io.Reader) (msg Message, err error) {
+	typeByte, buffer, err := readMsg(c)
+	if err != nil {
+		return
+	}
+	return UnPack(typeByte, buffer)
+}
+
+func ReadMsgInto(c io.Reader, msg Message) (err error) {
+	_, buffer, err := readMsg(c)
+	if err != nil {
+		return
+	}
+	return UnPackInto(buffer, msg)
+}
+
+func WriteMsg(c io.Writer, msg interface{}) (err error) {
+	buffer, err := Pack(msg)
+	if err != nil {
+		return
+	}
+
+	if _, err = c.Write(buffer); err != nil {
+		return
+	}
+
+	return nil
+}