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rpc_stream.go
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/
rpc_stream.go
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// Copyright 2020 The vine Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"context"
"io"
"sync"
"github.com/lack-io/vine/service/codec"
)
// Implements the streamer interface
type rpcStream struct {
sync.RWMutex
id string
closed chan bool
err error
request Request
response Response
codec codec.Codec
ctx context.Context
// signal whether we should send EOS
sendEOS bool
// release releases the connection back to the pool
release func(err error)
}
func (r *rpcStream) isClosed() bool {
select {
case <-r.closed:
return true
default:
return false
}
}
func (r *rpcStream) Context() context.Context {
return r.ctx
}
func (r *rpcStream) Request() Request {
return r.request
}
func (r *rpcStream) Response() Response {
return r.response
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.isClosed() {
r.err = errShutdown
return errShutdown
}
req := codec.Message{
Id: r.id,
Target: r.request.Service(),
Method: r.request.Method(),
Endpoint: r.request.Endpoint(),
Type: codec.Request,
}
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 codec.Message
r.Unlock()
err := r.codec.ReadHeader(&resp, codec.Response)
r.Lock()
if 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
}
r.Unlock()
err = r.codec.ReadBody(nil)
r.Lock()
if err != nil {
r.err = err
}
default:
r.Unlock()
err = r.codec.ReadBody(msg)
r.Lock()
if 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 {
r.Lock()
select {
case <-r.closed:
r.Unlock()
return nil
default:
close(r.closed)
r.Unlock()
// send the end of stream message
if r.sendEOS {
// no need to check for error
r.codec.Write(&codec.Message{
Id: r.id,
Target: r.request.Service(),
Method: r.request.Method(),
Endpoint: r.request.Endpoint(),
Type: codec.Error,
Error: lastStreamResponseError,
}, nil)
}
err := r.codec.Close()
// release the connection
r.release(r.Error())
// return the codec error
return err
}
}