micro/client/rpc_stream.go
2019-01-09 17:33:28 +00:00

111 lines
1.7 KiB
Go

package client
import (
"context"
"io"
"sync"
)
// Implements the streamer interface
type rpcStream struct {
sync.RWMutex
seq string
closed chan bool
err error
request Request
codec *rpcCodec
context context.Context
}
func (r *rpcStream) isClosed() bool {
select {
case <-r.closed:
return true
default:
return false
}
}
func (r *rpcStream) Context() context.Context {
return r.context
}
func (r *rpcStream) Request() Request {
return r.request
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.isClosed() {
r.err = errShutdown
return errShutdown
}
seq := r.seq
req := request{
Service: r.request.Service(),
Seq: seq,
ServiceMethod: r.request.Method(),
}
if err := r.codec.Write(&req, msg); err != nil {
r.err = err
return err
}
return nil
}
func (r *rpcStream) Recv(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.isClosed() {
r.err = errShutdown
return errShutdown
}
var resp response
if err := r.codec.Read(&resp, msg); err != nil {
if err == io.EOF && !r.isClosed() {
r.err = io.ErrUnexpectedEOF
return io.ErrUnexpectedEOF
}
r.err = err
return err
}
switch {
case len(resp.Error) > 0:
// We've got an error response. Give this to the request;
// any subsequent requests will get the ReadBody
// error if there is one.
if resp.Error != lastStreamResponseError {
r.err = serverError(resp.Error)
} else {
r.err = io.EOF
}
}
return r.err
}
func (r *rpcStream) Error() error {
r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
select {
case <-r.closed:
return nil
default:
close(r.closed)
return r.codec.Close()
}
}