/
client.go
138 lines (107 loc) · 2.37 KB
/
client.go
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// Copyright 2010 Eric Clark. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package protorpc
import (
"rpc"
"io"
"os"
"net"
"goprotobuf.googlecode.com/hg/proto"
)
type clientCodec struct {
c io.ReadWriteCloser
req *bufferPair
resp *bufferPair
}
func NewClientCodec(conn io.ReadWriteCloser) rpc.ClientCodec {
req := &bufferPair{proto.NewBuffer(nil), proto.NewBuffer(nil)}
resp := &bufferPair{proto.NewBuffer(nil), proto.NewBuffer(nil)}
return &clientCodec{conn, req, resp}
}
func (c *clientCodec) WriteRequest(r *rpc.Request, message interface{}) (err os.Error) {
c.req.header.Reset()
c.req.body.Reset()
h := new(Header)
h.Seq = &r.Seq
h.ServiceMethod = &r.ServiceMethod
err = c.req.header.Marshal(h)
if err != nil {
return
}
err = c.req.body.Marshal(message)
if err != nil {
return
}
_, err = c.c.Write(encodeLen(len(c.req.header.Bytes())))
if err != nil {
return
}
_, err = c.c.Write(c.req.header.Bytes())
if err != nil {
return
}
_, err = c.c.Write(encodeLen(len(c.req.body.Bytes())))
if err != nil {
return
}
_, err = c.c.Write(c.req.body.Bytes())
if err != nil {
return
}
return
}
func (c *clientCodec) ReadResponseHeader(r *rpc.Response) (err os.Error) {
c.resp.header.Reset()
lbuf := make([]byte, lenSize)
_, err = io.ReadFull(c.c, lbuf)
if err != nil {
return
}
pbuf := make([]byte, decodeLen(lbuf))
_, err = io.ReadFull(c.c, pbuf)
if err != nil {
return
}
c.resp.header.SetBuf(pbuf)
h := new(Header)
err = c.resp.header.Unmarshal(h)
if err != nil {
return
}
r.Seq = *h.Seq
r.ServiceMethod = *h.ServiceMethod
r.Error = *h.Error
return nil
}
func (c *clientCodec) ReadResponseBody(message interface{}) (err os.Error) {
c.resp.body.Reset()
lbuf := make([]byte, lenSize)
_, err = io.ReadFull(c.c, lbuf)
if err != nil {
return
}
pbuf := make([]byte, decodeLen(lbuf))
_, err = io.ReadFull(c.c, pbuf)
if err != nil {
return
}
c.resp.body.SetBuf(pbuf)
err = c.resp.body.Unmarshal(message)
if err != nil {
return
}
return
}
func (c *clientCodec) Close() os.Error {
return c.c.Close()
}
func Dial(netw, laddr, raddr string) (*rpc.Client, os.Error) {
conn, err := net.Dial(netw, laddr, raddr)
if err != nil {
return nil, err
}
codec := NewClientCodec(conn)
client := rpc.NewClientWithCodec(codec)
return client, nil
}