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server.go
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server.go
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package codec
import (
"bufio"
"fmt"
"io"
"net/rpc"
"sync"
"github.com/golang/protobuf/proto"
"github.com/mars9/codec/wirepb"
)
const defaultBufferSize = 4 * 1024
type serverCodec struct {
mu sync.Mutex // exclusive writer lock
resp wirepb.ResponseHeader
enc *Encoder
w *bufio.Writer
req wirepb.RequestHeader
dec *Decoder
c io.Closer
}
// NewServerCodec returns a new rpc.ServerCodec.
//
// A ServerCodec implements reading of RPC requests and writing of RPC
// responses for the server side of an RPC session. The server calls
// ReadRequestHeader and ReadRequestBody in pairs to read requests from the
// connection, and it calls WriteResponse to write a response back. The
// server calls Close when finished with the connection. ReadRequestBody
// may be called with a nil argument to force the body of the request to be
// read and discarded.
func NewServerCodec(rwc io.ReadWriteCloser) rpc.ServerCodec {
w := bufio.NewWriterSize(rwc, defaultBufferSize)
r := bufio.NewReaderSize(rwc, defaultBufferSize)
return &serverCodec{
enc: NewEncoder(w),
w: w,
dec: NewDecoder(r),
c: rwc,
}
}
func (c *serverCodec) WriteResponse(resp *rpc.Response, body interface{}) error {
c.mu.Lock()
c.resp.Method = resp.ServiceMethod
c.resp.Seq = resp.Seq
c.resp.Error = resp.Error
err := encode(c.enc, &c.resp)
if err != nil {
c.mu.Unlock()
return err
}
if err = encode(c.enc, body); err != nil {
c.mu.Unlock()
return err
}
err = c.w.Flush()
c.mu.Unlock()
return err
}
func (c *serverCodec) ReadRequestHeader(req *rpc.Request) error {
c.req.Reset()
if err := c.dec.Decode(&c.req); err != nil {
return err
}
req.ServiceMethod = c.req.Method
req.Seq = c.req.Seq
return nil
}
func (c *serverCodec) ReadRequestBody(body interface{}) error {
if pb, ok := body.(proto.Message); ok {
return c.dec.Decode(pb)
}
return fmt.Errorf("%T does not implement proto.Message", body)
}
func (c *serverCodec) Close() error { return c.c.Close() }