122 lines
2.5 KiB
Go
122 lines
2.5 KiB
Go
/*
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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 streaming
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import (
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"context"
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"errors"
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"fmt"
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"io"
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transferapi "github.com/containerd/containerd/api/types/transfer"
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"github.com/containerd/containerd/v2/core/streaming"
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"github.com/containerd/typeurl/v2"
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)
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type readByteStream struct {
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ctx context.Context
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stream streaming.Stream
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window int32
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updated chan struct{}
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errCh chan error
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remaining []byte
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}
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func ReadByteStream(ctx context.Context, stream streaming.Stream) io.ReadCloser {
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rbs := &readByteStream{
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ctx: ctx,
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stream: stream,
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window: 0,
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errCh: make(chan error),
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updated: make(chan struct{}, 1),
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}
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go func() {
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for {
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if rbs.window >= windowSize {
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select {
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case <-ctx.Done():
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return
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case <-rbs.updated:
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continue
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}
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}
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update := &transferapi.WindowUpdate{
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Update: windowSize,
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}
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anyType, err := typeurl.MarshalAny(update)
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if err != nil {
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rbs.errCh <- err
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return
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}
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if err := stream.Send(anyType); err == nil {
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rbs.window += windowSize
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} else if !errors.Is(err, io.EOF) {
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rbs.errCh <- err
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}
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}
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}()
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return rbs
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}
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func (r *readByteStream) Read(p []byte) (n int, err error) {
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plen := len(p)
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if len(r.remaining) > 0 {
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copied := copy(p, r.remaining)
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if len(r.remaining) > plen {
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r.remaining = r.remaining[plen:]
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} else {
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r.remaining = nil
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}
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return copied, nil
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}
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select {
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case <-r.ctx.Done():
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return 0, r.ctx.Err()
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case err := <-r.errCh:
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return 0, err
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default:
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}
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anyType, err := r.stream.Recv()
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if err != nil {
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return 0, err
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}
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i, err := typeurl.UnmarshalAny(anyType)
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if err != nil {
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return 0, err
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}
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switch v := i.(type) {
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case *transferapi.Data:
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n := copy(p, v.Data)
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if len(v.Data) > plen {
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r.remaining = v.Data[plen:]
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}
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r.window = r.window - int32(n)
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if r.window < windowSize {
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r.updated <- struct{}{}
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}
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return n, nil
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default:
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return 0, fmt.Errorf("stream received error type %v", v)
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}
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}
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func (r *readByteStream) Close() error {
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return r.stream.Close()
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}
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