117 lines
1.9 KiB
Go
117 lines
1.9 KiB
Go
package client
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"sync"
|
|
)
|
|
|
|
// Implements the streamer interface
|
|
type rpcStream struct {
|
|
sync.RWMutex
|
|
seq uint64
|
|
closed chan bool
|
|
err error
|
|
request Request
|
|
codec clientCodec
|
|
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.WriteRequest(&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.ReadResponseHeader(&resp); 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 ReadResponseBody
|
|
// error if there is one.
|
|
if resp.Error != lastStreamResponseError {
|
|
r.err = serverError(resp.Error)
|
|
} else {
|
|
r.err = io.EOF
|
|
}
|
|
if err := r.codec.ReadResponseBody(nil); err != nil {
|
|
r.err = err
|
|
}
|
|
default:
|
|
if err := r.codec.ReadResponseBody(msg); err != nil {
|
|
r.err = err
|
|
}
|
|
}
|
|
|
|
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()
|
|
}
|
|
}
|