vendor: update buildkit

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/github.com/containerd/ttrpc/stream.go

@@ -0,0 +1,81 @@
+/*
+   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"
+	"sync"
+)
+
+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
+}