vendor: add golib/msg

vendor/github.com/fatedier/golib/msg/json/process.go

@@ -0,0 +1,89 @@
+// Copyright 2018 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 json
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+var (
+	ErrMsgType      = errors.New("message type error")
+	ErrMaxMsgLength = errors.New("message length exceed the limit")
+	ErrMsgFormat    = errors.New("message format error")
+)
+
+func (msgCtl *MsgCtl) 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 := msgCtl.typeMap[typeByte]; !ok {
+		err = ErrMsgType
+		return
+	}
+
+	var length int64
+	err = binary.Read(c, binary.BigEndian, &length)
+	if err != nil {
+		return
+	}
+	if length > msgCtl.maxMsgLength {
+		err = ErrMaxMsgLength
+		return
+	}
+
+	buffer = make([]byte, length)
+	n, err := io.ReadFull(c, buffer)
+	if err != nil {
+		return
+	}
+
+	if int64(n) != length {
+		err = ErrMsgFormat
+	}
+	return
+}
+
+func (msgCtl *MsgCtl) ReadMsg(c io.Reader) (msg Message, err error) {
+	typeByte, buffer, err := msgCtl.readMsg(c)
+	if err != nil {
+		return
+	}
+	return msgCtl.UnPack(typeByte, buffer)
+}
+
+func (msgCtl *MsgCtl) ReadMsgInto(c io.Reader, msg Message) (err error) {
+	_, buffer, err := msgCtl.readMsg(c)
+	if err != nil {
+		return
+	}
+	return msgCtl.UnPackInto(buffer, msg)
+}
+
+func (msgCtl *MsgCtl) WriteMsg(c io.Writer, msg interface{}) (err error) {
+	buffer, err := msgCtl.Pack(msg)
+	if err != nil {
+		return
+	}
+
+	if _, err = c.Write(buffer); err != nil {
+		return
+	}
+	return nil
+}