44167aa47a
* upgrade k8s package version Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io> * Script upgrade and code formatting. Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io> Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>
113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
/*
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Copyright The ORAS 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 content
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import (
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"context"
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"io"
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"io/ioutil"
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"github.com/containerd/containerd/content"
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"github.com/opencontainers/go-digest"
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)
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// IoContentWriter writer that wraps an io.Writer, so the results can be streamed to
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// an open io.Writer. For example, can be used to pull a layer and write it to a file, or device.
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type IoContentWriter struct {
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writer io.Writer
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digester digest.Digester
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size int64
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hash *digest.Digest
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}
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// NewIoContentWriter create a new IoContentWriter.
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//
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// By default, it calculates the hash when writing. If the option `skipHash` is true,
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// it will skip doing the hash. Skipping the hash is intended to be used only
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// if you are confident about the validity of the data being passed to the writer,
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// and wish to save on the hashing time.
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func NewIoContentWriter(writer io.Writer, opts ...WriterOpt) content.Writer {
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w := writer
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if w == nil {
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w = ioutil.Discard
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}
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// process opts for default
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wOpts := DefaultWriterOpts()
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for _, opt := range opts {
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if err := opt(&wOpts); err != nil {
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return nil
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}
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}
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ioc := &IoContentWriter{
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writer: w,
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digester: digest.Canonical.Digester(),
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// we take the OutputHash, since the InputHash goes to the passthrough writer,
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// which then passes the processed output to us
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hash: wOpts.OutputHash,
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}
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return NewPassthroughWriter(ioc, func(r io.Reader, w io.Writer, done chan<- error) {
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// write out the data to the io writer
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var (
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err error
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)
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// we could use io.Copy, but calling it with the default blocksize is identical to
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// io.CopyBuffer. Otherwise, we would need some way to let the user flag "I want to use
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// io.Copy", when it should not matter to them
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b := make([]byte, wOpts.Blocksize, wOpts.Blocksize)
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_, err = io.CopyBuffer(w, r, b)
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done <- err
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}, opts...)
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}
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func (w *IoContentWriter) Write(p []byte) (n int, err error) {
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n, err = w.writer.Write(p)
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if err != nil {
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return 0, err
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}
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w.size += int64(n)
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if w.hash == nil {
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w.digester.Hash().Write(p[:n])
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}
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return
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}
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func (w *IoContentWriter) Close() error {
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return nil
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}
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// Digest may return empty digest or panics until committed.
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func (w *IoContentWriter) Digest() digest.Digest {
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return w.digester.Digest()
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}
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// Commit commits the blob (but no roll-back is guaranteed on an error).
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// size and expected can be zero-value when unknown.
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// Commit always closes the writer, even on error.
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// ErrAlreadyExists aborts the writer.
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func (w *IoContentWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
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return nil
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}
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// Status returns the current state of write
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func (w *IoContentWriter) Status() (content.Status, error) {
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return content.Status{}, nil
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}
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// Truncate updates the size of the target blob
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func (w *IoContentWriter) Truncate(size int64) error {
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return nil
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}
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