forked from andeya/erpc
/
jsonproto.go
151 lines (134 loc) · 3.77 KB
/
jsonproto.go
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// Package jsonproto is implemented JSON socket communication protocol.
// Message data format: {length bytes}{xfer_pipe length byte}{xfer_pipe bytes}{JSON bytes}
//
// Copyright 2018 HenryLee. All Rights Reserved.
//
// 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 jsonproto
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"sync"
"github.com/tidwall/gjson"
"github.com/henrylee2cn/goutil"
tp "github.com/henrylee2cn/teleport"
"github.com/henrylee2cn/teleport/utils"
)
// NewJsonProtoFunc is creation function of JSON socket protocol.
// Message data format: {length bytes}{xfer_pipe length byte}{xfer_pipe bytes}{JSON bytes}
// Message data demo: `830{"seq":%q,"mtype":%d,"serviceMethod":%q,"meta":%q,"bodyCodec":%d,"body":"%s"}`
var NewJsonProtoFunc = func(rw tp.IOWithReadBuffer) tp.Proto {
return &jsonproto{
id: 'j',
name: "json",
rw: rw,
}
}
type jsonproto struct {
id byte
name string
rw tp.IOWithReadBuffer
rMu sync.Mutex
}
// Version returns the protocol's id and name.
func (j *jsonproto) Version() (byte, string) {
return j.id, j.name
}
const format = `{"seq":%d,"mtype":%d,"serviceMethod":%q,"meta":%q,"bodyCodec":%d,"body":"%s"}`
// Pack writes the Message into the connection.
// NOTE: Make sure to write only once or there will be package contamination!
func (j *jsonproto) Pack(m tp.Message) error {
// marshal body
bodyBytes, err := m.MarshalBody()
if err != nil {
return err
}
// marshal whole
var s = fmt.Sprintf(format,
m.Seq(),
m.Mtype(),
m.ServiceMethod(),
m.Meta().QueryString(),
m.BodyCodec(),
bytes.Replace(bodyBytes, []byte{'"'}, []byte{'\\', '"'}, -1),
)
// do transfer pipe
b, err := m.XferPipe().OnPack(goutil.StringToBytes(s))
if err != nil {
return err
}
xferPipeLen := m.XferPipe().Len()
// set size
m.SetSize(uint32(1 + xferPipeLen + len(b)))
// pack
var all = make([]byte, m.Size()+4)
binary.BigEndian.PutUint32(all, m.Size())
all[4] = byte(xferPipeLen)
copy(all[4+1:], m.XferPipe().IDs())
copy(all[4+1+xferPipeLen:], b)
_, err = j.rw.Write(all)
return err
}
// Unpack reads bytes from the connection to the Message.
// NOTE: Concurrent unsafe!
func (j *jsonproto) Unpack(m tp.Message) error {
j.rMu.Lock()
defer j.rMu.Unlock()
var size uint32
err := binary.Read(j.rw, binary.BigEndian, &size)
if err != nil {
return err
}
if err = m.SetSize(size); err != nil {
return err
}
if m.Size() == 0 {
return nil
}
bb := utils.AcquireByteBuffer()
defer utils.ReleaseByteBuffer(bb)
bb.ChangeLen(int(m.Size()))
_, err = io.ReadFull(j.rw, bb.B)
if err != nil {
return err
}
// transfer pipe
var xferLen = bb.B[0]
bb.B = bb.B[1:]
if xferLen > 0 {
err = m.XferPipe().Append(bb.B[:xferLen]...)
if err != nil {
return err
}
bb.B = bb.B[xferLen:]
// do transfer pipe
bb.B, err = m.XferPipe().OnUnpack(bb.B)
if err != nil {
return err
}
}
s := string(bb.B)
// read other
m.SetSeq(int32(gjson.Get(s, "seq").Int()))
m.SetMtype(byte(gjson.Get(s, "mtype").Int()))
m.SetServiceMethod(gjson.Get(s, "serviceMethod").String())
meta := gjson.Get(s, "meta").String()
m.Meta().ParseBytes(goutil.StringToBytes(meta))
// read body
m.SetBodyCodec(byte(gjson.Get(s, "bodyCodec").Int()))
body := gjson.Get(s, "body").String()
err = m.UnmarshalBody(goutil.StringToBytes(body))
return err
}