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Signed-off-by: Abel Feng <fshb1988@gmail.com>
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/* | ||
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. | ||
*/ | ||
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package streaming | ||
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import ( | ||
"context" | ||
"errors" | ||
"fmt" | ||
"io" | ||
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transferapi "github.com/containerd/containerd/api/types/transfer" | ||
"github.com/containerd/containerd/v2/core/streaming" | ||
"github.com/containerd/typeurl/v2" | ||
) | ||
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type readByteStream struct { | ||
ctx context.Context | ||
stream streaming.Stream | ||
window int32 | ||
updated chan struct{} | ||
errCh chan error | ||
remaining []byte | ||
} | ||
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func ReadByteStream(ctx context.Context, stream streaming.Stream) io.ReadCloser { | ||
rbs := &readByteStream{ | ||
ctx: ctx, | ||
stream: stream, | ||
window: 0, | ||
errCh: make(chan error), | ||
updated: make(chan struct{}, 1), | ||
} | ||
go func() { | ||
for { | ||
if rbs.window >= windowSize { | ||
select { | ||
case <-ctx.Done(): | ||
return | ||
case <-rbs.updated: | ||
continue | ||
} | ||
} | ||
if rbs.window < windowSize { | ||
update := &transferapi.WindowUpdate{ | ||
Update: windowSize, | ||
} | ||
anyType, err := typeurl.MarshalAny(update) | ||
if err != nil { | ||
rbs.errCh <- err | ||
return | ||
} | ||
if err := stream.Send(anyType); err == nil { | ||
rbs.window += windowSize | ||
} else if !errors.Is(err, io.EOF) { | ||
rbs.errCh <- err | ||
} | ||
} | ||
} | ||
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}() | ||
return rbs | ||
} | ||
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func (r *readByteStream) Read(p []byte) (n int, err error) { | ||
plen := len(p) | ||
if len(r.remaining) > 0 { | ||
copied := copy(p, r.remaining) | ||
if len(r.remaining) > plen { | ||
r.remaining = r.remaining[plen:] | ||
} else { | ||
r.remaining = nil | ||
} | ||
return copied, nil | ||
} | ||
select { | ||
case <-r.ctx.Done(): | ||
return 0, r.ctx.Err() | ||
case err := <-r.errCh: | ||
return 0, err | ||
default: | ||
} | ||
anyType, err := r.stream.Recv() | ||
if err != nil { | ||
return 0, err | ||
} | ||
i, err := typeurl.UnmarshalAny(anyType) | ||
if err != nil { | ||
return 0, err | ||
} | ||
switch v := i.(type) { | ||
case *transferapi.Data: | ||
n := copy(p, v.Data) | ||
if len(v.Data) > plen { | ||
r.remaining = v.Data[plen:] | ||
} | ||
r.window = r.window - int32(n) | ||
if r.window < windowSize { | ||
r.updated <- struct{}{} | ||
} | ||
return n, nil | ||
default: | ||
return 0, fmt.Errorf("stream received error type %v", v) | ||
} | ||
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} | ||
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func (r *readByteStream) Close() error { | ||
return r.stream.Close() | ||
} |
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