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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,124 @@ | ||
package oci | ||
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import ( | ||
"io" | ||
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"github.com/containerd/containerd/content" | ||
"github.com/containerd/errdefs" | ||
"github.com/go-logr/logr" | ||
"github.com/pkg/errors" | ||
) | ||
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const maxRetry = 3 | ||
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type httpReadSeeker struct { | ||
rc content.ReaderAt | ||
log logr.Logger | ||
size int64 | ||
offset int64 | ||
errsWithNoProgress int | ||
closed bool | ||
} | ||
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var _ io.ReadSeekCloser = (*httpReadSeeker)(nil) | ||
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func newHTTPReadSeeker(log logr.Logger, reader content.ReaderAt) (io.ReadSeekCloser, error) { | ||
if reader == nil { | ||
return nil, errors.Errorf("httpReadSeeker: reader cannot be nil") | ||
} | ||
return &httpReadSeeker{ | ||
log: log, | ||
rc: reader, | ||
size: reader.Size(), | ||
}, nil | ||
} | ||
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func (hrs *httpReadSeeker) Read(p []byte) (n int, err error) { | ||
if hrs.closed { | ||
return 0, io.EOF | ||
} | ||
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n, err = hrs.rc.ReadAt(p, hrs.offset) | ||
hrs.offset += int64(n) | ||
if n > 0 || err == nil { | ||
hrs.errsWithNoProgress = 0 | ||
} | ||
if err == io.ErrUnexpectedEOF { | ||
// connection closed unexpectedly. try reconnecting. | ||
if n == 0 { | ||
hrs.errsWithNoProgress++ | ||
if hrs.errsWithNoProgress > maxRetry { | ||
return // too many retries for this offset with no progress | ||
} | ||
} | ||
if hrs.rc != nil { | ||
if clsErr := hrs.rc.Close(); clsErr != nil { | ||
hrs.log.Error(clsErr, "httpReadSeeker: failed to close ReadCloser") | ||
} | ||
hrs.rc = nil | ||
} | ||
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} else if err == io.EOF { | ||
// The CRI's imagePullProgressTimeout relies on responseBody.Close to | ||
// update the process monitor's status. If the err is io.EOF, close | ||
// the connection since there is no more available data. | ||
if hrs.rc != nil { | ||
if clsErr := hrs.rc.Close(); clsErr != nil { | ||
hrs.log.Error(clsErr, "httpReadSeeker: failed to close ReadCloser after io.EOF") | ||
} | ||
hrs.rc = nil | ||
} | ||
} | ||
return | ||
} | ||
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func (hrs *httpReadSeeker) Close() error { | ||
if hrs.closed { | ||
return nil | ||
} | ||
hrs.closed = true | ||
if hrs.rc != nil { | ||
return hrs.rc.Close() | ||
} | ||
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return nil | ||
} | ||
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func (hrs *httpReadSeeker) Seek(offset int64, whence int) (int64, error) { | ||
if hrs.closed { | ||
return 0, errors.Errorf("Fetcher.Seek: closed: %v", errdefs.ErrUnavailable) | ||
} | ||
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abs := hrs.offset | ||
switch whence { | ||
case io.SeekStart: | ||
abs = offset | ||
case io.SeekCurrent: | ||
abs += offset | ||
case io.SeekEnd: | ||
if hrs.size == -1 { | ||
return 0, errors.Errorf("Fetcher.Seek: unknown size, cannot seek from end: %v", errdefs.ErrUnavailable) | ||
} | ||
abs = hrs.size + offset | ||
default: | ||
return 0, errors.Errorf("Fetcher.Seek: invalid whence: %v", errdefs.ErrInvalidArgument) | ||
} | ||
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if abs < 0 { | ||
return 0, errors.Errorf("Fetcher.Seek: negative offset: %v", errdefs.ErrInvalidArgument) | ||
} | ||
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if abs != hrs.offset { | ||
if hrs.rc != nil { | ||
if err := hrs.rc.Close(); err != nil { | ||
hrs.log.Error(err, "Fetcher.Seek: failed to close ReadCloser") | ||
} | ||
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hrs.rc = nil | ||
} | ||
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hrs.offset = abs | ||
} | ||
|
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return hrs.offset, nil | ||
} |
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