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rpc_stream.go
118 lines (101 loc) · 2.23 KB
/
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 server
import (
"context"
"errors"
"io"
"sync"
"github.com/lack-io/vine/service/codec"
)
// Implements the Streamer interface
type rpcStream struct {
sync.RWMutex
id string
closed bool
err error
request Request
codec codec.Codec
ctx context.Context
}
func (r *rpcStream) Context() context.Context {
return r.ctx
}
func (r *rpcStream) Request() Request {
return r.request
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
resp := codec.Message{
Target: r.request.Service(),
Method: r.request.Method(),
Endpoint: r.request.Endpoint(),
Id: r.id,
Type: codec.Response,
}
if err := r.codec.Write(&resp, msg); err != nil {
r.err = err
}
return nil
}
func (r *rpcStream) Recv(msg interface{}) error {
req := new(codec.Message)
req.Type = codec.Request
err := r.codec.ReadHeader(req, req.Type)
r.Lock()
defer r.Unlock()
if err != nil {
// discard body
r.codec.ReadBody(nil)
r.err = err
return err
}
// check the error
if len(req.Error) > 0 {
// Check the client closed the stream
switch req.Error {
case lastStreamResponseError.Error():
// discard body
r.Unlock()
r.codec.ReadBody(nil)
r.Lock()
r.err = io.EOF
return io.EOF
default:
return errors.New(req.Error)
}
}
// we need to stay up to date with sequence numbers
r.id = req.Id
r.Unlock()
err = r.codec.ReadBody(msg)
r.Lock()
if err != nil {
r.err = err
return err
}
return nil
}
func (r *rpcStream) Error() error {
r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
r.Lock()
defer r.Unlock()
r.closed = true
return r.codec.Close()
}