micro/client/rpc_codec.go

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package client
import (
"bytes"
"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/codec/jsonrpc"
"github.com/micro/go-micro/codec/protorpc"
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"github.com/micro/go-micro/transport"
rpc "github.com/youtube/vitess/go/rpcplus"
)
type rpcPlusCodec struct {
client transport.Client
codec codec.Codec
req *transport.Message
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buf *readWriteCloser
}
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type readWriteCloser struct {
wbuf *bytes.Buffer
rbuf *bytes.Buffer
}
var (
defaultContentType = "application/octet-stream"
defaultCodecs = map[string]codec.NewCodec{
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"application/json": jsonrpc.NewCodec,
"application/json-rpc": jsonrpc.NewCodec,
"application/protobuf": protorpc.NewCodec,
"application/proto-rpc": protorpc.NewCodec,
"application/octet-stream": protorpc.NewCodec,
}
)
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func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
return rwc.rbuf.Read(p)
}
func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
return rwc.wbuf.Write(p)
}
func (rwc *readWriteCloser) Close() error {
rwc.rbuf.Reset()
rwc.wbuf.Reset()
return nil
}
func newRpcPlusCodec(req *transport.Message, client transport.Client, c codec.NewCodec) *rpcPlusCodec {
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rwc := &readWriteCloser{
wbuf: bytes.NewBuffer(nil),
rbuf: bytes.NewBuffer(nil),
}
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r := &rpcPlusCodec{
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buf: rwc,
client: client,
codec: c(rwc),
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req: req,
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}
return r
}
func (c *rpcPlusCodec) WriteRequest(req *rpc.Request, body interface{}) error {
m := &codec.Message{
Id: req.Seq,
Method: req.ServiceMethod,
Type: codec.Request,
}
if err := c.codec.Write(m, body); err != nil {
return err
}
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c.req.Body = c.buf.wbuf.Bytes()
return c.client.Send(c.req)
}
func (c *rpcPlusCodec) ReadResponseHeader(r *rpc.Response) error {
var m transport.Message
if err := c.client.Recv(&m); err != nil {
return err
}
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c.buf.rbuf.Reset()
c.buf.rbuf.Write(m.Body)
var me codec.Message
err := c.codec.ReadHeader(&me, codec.Response)
r.ServiceMethod = me.Method
r.Seq = me.Id
r.Error = me.Error
return err
}
func (c *rpcPlusCodec) ReadResponseBody(b interface{}) error {
return c.codec.ReadBody(b)
}
func (c *rpcPlusCodec) Close() error {
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c.buf.Close()
c.codec.Close()
return c.client.Close()
}