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pbproto.go
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/
pbproto.go
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// Package pbproto is implemented PROTOBUF socket communication protocol.
// Packet 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 pbproto
import (
"bufio"
"encoding/binary"
"io"
"sync"
"github.com/henrylee2cn/teleport/codec"
"github.com/henrylee2cn/teleport/socket"
"github.com/henrylee2cn/teleport/utils"
"github.com/henrylee2cn/tp-ext/proto-pbproto/pb"
)
// NewPbProtoFunc is creation function of PROTOBUF socket protocol.
var NewPbProtoFunc = func(rw io.ReadWriter) socket.Proto {
var (
readBufioSize int
readBufferSize, isDefault = socket.ReadBuffer()
)
if isDefault {
readBufioSize = 1024 * 4
} else if readBufferSize == 0 {
readBufioSize = 1024 * 35
} else {
readBufioSize = readBufferSize / 2
}
return &pbproto{
id: 'p',
name: "protobuf",
r: bufio.NewReaderSize(rw, readBufioSize),
w: rw,
}
}
type pbproto struct {
id byte
name string
r *bufio.Reader
w io.Writer
rMu sync.Mutex
}
// Version returns the protocol's id and name.
func (pp *pbproto) Version() (byte, string) {
return pp.id, pp.name
}
// Pack writes the Packet into the connection.
// Note: Make sure to write only once or there will be package contamination!
func (pp *pbproto) Pack(p *socket.Packet) error {
// marshal body
bodyBytes, err := p.MarshalBody()
if err != nil {
return err
}
b, err := codec.ProtoMarshal(&pb.Payload{
Seq: p.Seq(),
Ptype: int32(p.Ptype()),
Uri: p.Uri(),
Meta: p.Meta().QueryString(),
BodyCodec: int32(p.BodyCodec()),
Body: bodyBytes,
})
if err != nil {
return err
}
// do transfer pipe
b, err = p.XferPipe().OnPack(b)
if err != nil {
return err
}
xferPipeLen := p.XferPipe().Len()
// set size
p.SetSize(uint32(1 + xferPipeLen + len(b)))
// pack
var all = make([]byte, p.Size()+4)
binary.BigEndian.PutUint32(all, p.Size())
all[4] = byte(xferPipeLen)
copy(all[4+1:], p.XferPipe().Ids())
copy(all[4+1+xferPipeLen:], b)
_, err = pp.w.Write(all)
return err
}
// Unpack reads bytes from the connection to the Packet.
// Note: Concurrent unsafe!
func (pp *pbproto) Unpack(p *socket.Packet) error {
pp.rMu.Lock()
defer pp.rMu.Unlock()
var size uint32
err := binary.Read(pp.r, binary.BigEndian, &size)
if err != nil {
return err
}
if err = p.SetSize(size); err != nil {
return err
}
if p.Size() == 0 {
return nil
}
bb := utils.AcquireByteBuffer()
defer utils.ReleaseByteBuffer(bb)
bb.ChangeLen(int(p.Size()))
_, err = io.ReadFull(pp.r, bb.B)
if err != nil {
return err
}
// transfer pipe
var xferLen = bb.B[0]
bb.B = bb.B[1:]
if xferLen > 0 {
err = p.XferPipe().Append(bb.B[:xferLen]...)
if err != nil {
return err
}
bb.B = bb.B[xferLen:]
// do transfer pipe
bb.B, err = p.XferPipe().OnUnpack(bb.B)
if err != nil {
return err
}
}
s := &pb.Payload{}
err = codec.ProtoUnmarshal(bb.B, s)
if err != nil {
return err
}
// read other
p.SetSeq(s.Seq)
p.SetPtype(byte(s.Ptype))
p.SetUri(s.Uri)
p.Meta().ParseBytes(s.Meta)
// read body
p.SetBodyCodec(byte(s.BodyCodec))
err = p.UnmarshalBody(s.Body)
return err
}