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server.go
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server.go
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// Copyright 2015 The Cockroach Authors.
//
// 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. See the AUTHORS file
// for names of contributors.
//
// Author: Peter Mattis ([email protected])
// Copyright 2013 <chaishushan{AT}gmail.com>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rpcbench
import (
"bufio"
"bytes"
"fmt"
"io"
"net/rpc"
"github.com/gogo/protobuf/proto"
)
type serverCodec struct {
baseConn
methods []string
// temporary work space
respBodyBuf bytes.Buffer
respHeaderBuf bytes.Buffer
respHeader ResponseHeader
reqHeader RequestHeader
}
// NewServerCodec returns a serverCodec that communicates with the ClientCodec
// on the other end of the given conn.
func NewServerCodec(conn io.ReadWriteCloser) rpc.ServerCodec {
return &serverCodec{
baseConn: baseConn{
r: bufio.NewReader(conn),
w: bufio.NewWriter(conn),
c: conn,
},
}
}
func (c *serverCodec) ReadRequestHeader(r *rpc.Request) error {
err := c.readRequestHeader(c.r, &c.reqHeader)
if err != nil {
return err
}
r.Seq = c.reqHeader.Id
if len(c.reqHeader.Method) == 0 {
if int(c.reqHeader.MethodId) >= len(c.methods) {
return fmt.Errorf("unexpected method-id: %d >= %d",
c.reqHeader.MethodId, len(c.methods))
}
r.ServiceMethod = c.methods[c.reqHeader.MethodId]
} else if int(c.reqHeader.MethodId) > len(c.methods) {
return fmt.Errorf("unexpected method-id: %d > %d",
c.reqHeader.MethodId, len(c.methods))
} else if int(c.reqHeader.MethodId) == len(c.methods) {
c.methods = append(c.methods, c.reqHeader.Method)
r.ServiceMethod = c.reqHeader.Method
}
return nil
}
func (c *serverCodec) ReadRequestBody(x interface{}) error {
if x == nil {
return nil
}
request, ok := x.(proto.Message)
if !ok {
return fmt.Errorf(
"protorpc.ServerCodec.ReadRequestBody: %T does not implement proto.Message",
x,
)
}
err := c.readRequestBody(c.r, &c.reqHeader, request)
if err != nil {
return err
}
c.reqHeader.Reset()
return nil
}
func (c *serverCodec) WriteResponse(r *rpc.Response, x interface{}) error {
var response proto.Message
if x != nil {
var ok bool
if response, ok = x.(proto.Message); !ok {
if _, ok = x.(struct{}); !ok {
return fmt.Errorf(
"protorpc.ServerCodec.WriteResponse: %T does not implement proto.Message",
x,
)
}
}
}
if err := c.writeResponse(r, response); err != nil {
return err
}
return c.w.Flush()
}
func (c *serverCodec) writeResponse(r *rpc.Response, response proto.Message) error {
// clear response if error
if r.Error != "" {
response = nil
}
// marshal response
var pbResponse []byte
if response != nil {
var err error
pbResponse, err = marshal(&c.respBodyBuf, response)
if err != nil {
return err
}
}
// generate header
header := &c.respHeader
*header = ResponseHeader{
Id: r.Seq,
// The net/rpc interface asks for the Response.ServiceMethod to be
// returned from the server, but it is never used.
//
// Method: r.ServiceMethod,
Error: r.Error,
Compression: compressionType,
UncompressedSize: uint32(len(pbResponse)),
}
// marshal header
pbHeader, err := marshal(&c.respHeaderBuf, header)
if err != nil {
return err
}
// send header (more)
if err := c.sendFrame(pbHeader); err != nil {
return err
}
// send body (end)
// if compressionType == CompressionType_SNAPPY {
// return snappyEncode(pbResponse, c.sendFrame)
// } else if compressionType == CompressionType_LZ4 {
// return lz4Encode(pbResponse, c.sendFrame)
// }
return c.sendFrame(pbResponse)
}
func (c *serverCodec) readRequestHeader(r *bufio.Reader, header *RequestHeader) error {
return c.recvProto(header, 0, protoUnmarshal)
}
func (c *serverCodec) readRequestBody(r *bufio.Reader, header *RequestHeader,
request proto.Message) error {
return c.recvProto(request, header.UncompressedSize, decompressors[header.Compression])
}
// ServeConn runs the Protobuf-RPC server on a single connection.
// ServeConn blocks, serving the connection until the client hangs up.
// The caller typically invokes ServeConn in a go statement.
func ServeConn(conn io.ReadWriteCloser) {
rpc.ServeCodec(NewServerCodec(conn))
}
type marshalTo interface {
Size() int
MarshalTo([]byte) (int, error)
}
func marshal(buf *bytes.Buffer, m proto.Message) ([]byte, error) {
if m == nil {
return nil, nil
}
if mt, ok := m.(marshalTo); ok {
buf.Reset()
size := mt.Size()
buf.Grow(size)
b := buf.Bytes()[:size]
n, err := mt.MarshalTo(b)
return b[:n], err
}
return proto.Marshal(m)
}