3eeeb9429a
gogoproto.customtype is used to have go-digest.Digest instead of string. While it is convinient, protoc-gen-go doesn't support the extension and that blocks #6564. Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>
72 lines
1.8 KiB
Go
72 lines
1.8 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 proxy
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import (
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"context"
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contentapi "github.com/containerd/containerd/api/services/content/v1"
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digest "github.com/opencontainers/go-digest"
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)
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type remoteReaderAt struct {
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ctx context.Context
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digest digest.Digest
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size int64
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client contentapi.ContentClient
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}
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func (ra *remoteReaderAt) Size() int64 {
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return ra.size
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}
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func (ra *remoteReaderAt) ReadAt(p []byte, off int64) (n int, err error) {
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rr := &contentapi.ReadContentRequest{
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Digest: ra.digest.String(),
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Offset: off,
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Size_: int64(len(p)),
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}
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// we need a child context with cancel, or the eventually called
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// grpc.NewStream will leak the goroutine until the whole thing is cleared.
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// See comment at https://godoc.org/google.golang.org/grpc#ClientConn.NewStream
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childCtx, cancel := context.WithCancel(ra.ctx)
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// we MUST cancel the child context; see comment above
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defer cancel()
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rc, err := ra.client.Read(childCtx, rr)
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if err != nil {
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return 0, err
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}
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for len(p) > 0 {
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var resp *contentapi.ReadContentResponse
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// fill our buffer up until we can fill p.
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resp, err = rc.Recv()
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if err != nil {
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return n, err
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}
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copied := copy(p, resp.Data)
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n += copied
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p = p[copied:]
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}
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return n, nil
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}
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func (ra *remoteReaderAt) Close() error {
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return nil
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}
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