d28bc92657
Implementation of the 1.2 protocol with support for streaming. Provides the client and server interfaces for implementing services with streaming. Unary behavior is mostly unchanged and avoids extra stream tracking just for unary calls. Streaming calls are tracked to route data to the appropriate stream as it is received. Stricter stream ID handling, disallowing unexpected re-use of stream IDs. Signed-off-by: Derek McGowan <derek@mcg.dev>
85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
/*
|
|
Copyright The containerd 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 ttrpc
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"sync"
|
|
)
|
|
|
|
var ErrStreamClosed = errors.New("ttrpc: stream closed")
|
|
|
|
type streamID uint32
|
|
|
|
type streamMessage struct {
|
|
header messageHeader
|
|
payload []byte
|
|
}
|
|
|
|
type stream struct {
|
|
id streamID
|
|
sender sender
|
|
recv chan *streamMessage
|
|
|
|
closeOnce sync.Once
|
|
recvErr error
|
|
}
|
|
|
|
func newStream(id streamID, send sender) *stream {
|
|
return &stream{
|
|
id: id,
|
|
sender: send,
|
|
recv: make(chan *streamMessage, 1),
|
|
}
|
|
}
|
|
|
|
func (s *stream) closeWithError(err error) error {
|
|
s.closeOnce.Do(func() {
|
|
if s.recv != nil {
|
|
close(s.recv)
|
|
if err != nil {
|
|
s.recvErr = err
|
|
} else {
|
|
s.recvErr = ErrClosed
|
|
}
|
|
|
|
}
|
|
})
|
|
return nil
|
|
}
|
|
|
|
func (s *stream) send(mt messageType, flags uint8, b []byte) error {
|
|
return s.sender.send(uint32(s.id), mt, flags, b)
|
|
}
|
|
|
|
func (s *stream) receive(ctx context.Context, msg *streamMessage) error {
|
|
if s.recvErr != nil {
|
|
return s.recvErr
|
|
}
|
|
select {
|
|
case s.recv <- msg:
|
|
return nil
|
|
case <-ctx.Done():
|
|
return ctx.Err()
|
|
}
|
|
}
|
|
|
|
type sender interface {
|
|
send(uint32, messageType, uint8, []byte) error
|
|
}
|