85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ttrpc
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import (
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"context"
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"sync"
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)
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type streamID uint32
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type streamMessage struct {
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header messageHeader
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payload []byte
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}
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type stream struct {
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id streamID
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sender sender
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recv chan *streamMessage
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closeOnce sync.Once
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recvErr error
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recvClose chan struct{}
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}
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func newStream(id streamID, send sender) *stream {
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return &stream{
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id: id,
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sender: send,
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recv: make(chan *streamMessage, 1),
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recvClose: make(chan struct{}),
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}
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}
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func (s *stream) closeWithError(err error) error {
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s.closeOnce.Do(func() {
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if err != nil {
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s.recvErr = err
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} else {
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s.recvErr = ErrClosed
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}
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close(s.recvClose)
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})
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return nil
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}
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func (s *stream) send(mt messageType, flags uint8, b []byte) error {
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return s.sender.send(uint32(s.id), mt, flags, b)
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}
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func (s *stream) receive(ctx context.Context, msg *streamMessage) error {
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select {
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case <-s.recvClose:
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return s.recvErr
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default:
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}
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select {
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case <-s.recvClose:
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return s.recvErr
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case s.recv <- msg:
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return nil
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case <-ctx.Done():
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return ctx.Err()
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}
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}
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type sender interface {
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send(uint32, messageType, uint8, []byte) error
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}
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