140 lines
3.2 KiB
Go
140 lines
3.2 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 containerd
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import (
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"context"
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"io"
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contentapi "github.com/containerd/containerd/api/services/content/v1"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/errdefs"
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digest "github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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type remoteWriter struct {
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ref string
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client contentapi.Content_WriteClient
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offset int64
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digest digest.Digest
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}
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// send performs a synchronous req-resp cycle on the client.
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func (rw *remoteWriter) send(req *contentapi.WriteContentRequest) (*contentapi.WriteContentResponse, error) {
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if err := rw.client.Send(req); err != nil {
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return nil, err
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}
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resp, err := rw.client.Recv()
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if err == nil {
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// try to keep these in sync
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if resp.Digest != "" {
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rw.digest = resp.Digest
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}
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}
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return resp, err
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}
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func (rw *remoteWriter) Status() (content.Status, error) {
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resp, err := rw.send(&contentapi.WriteContentRequest{
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Action: contentapi.WriteActionStat,
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})
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if err != nil {
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return content.Status{}, errors.Wrap(err, "error getting writer status")
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}
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return content.Status{
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Ref: rw.ref,
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Offset: resp.Offset,
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Total: resp.Total,
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StartedAt: resp.StartedAt,
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UpdatedAt: resp.UpdatedAt,
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}, nil
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}
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func (rw *remoteWriter) Digest() digest.Digest {
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return rw.digest
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}
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func (rw *remoteWriter) Write(p []byte) (n int, err error) {
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offset := rw.offset
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resp, err := rw.send(&contentapi.WriteContentRequest{
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Action: contentapi.WriteActionWrite,
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Offset: offset,
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Data: p,
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})
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if err != nil {
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return 0, err
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}
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n = int(resp.Offset - offset)
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if n < len(p) {
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err = io.ErrShortWrite
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}
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rw.offset += int64(n)
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if resp.Digest != "" {
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rw.digest = resp.Digest
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}
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return
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}
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func (rw *remoteWriter) Commit(ctx context.Context, size int64, expected digest.Digest, opts ...content.Opt) error {
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var base content.Info
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for _, opt := range opts {
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if err := opt(&base); err != nil {
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return err
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}
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}
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resp, err := rw.send(&contentapi.WriteContentRequest{
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Action: contentapi.WriteActionCommit,
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Total: size,
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Offset: rw.offset,
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Expected: expected,
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Labels: base.Labels,
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})
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if err != nil {
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return errdefs.FromGRPC(err)
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}
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if size != 0 && resp.Offset != size {
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return errors.Errorf("unexpected size: %v != %v", resp.Offset, size)
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}
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if expected != "" && resp.Digest != expected {
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return errors.Errorf("unexpected digest: %v != %v", resp.Digest, expected)
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}
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rw.digest = resp.Digest
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rw.offset = resp.Offset
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return nil
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}
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func (rw *remoteWriter) Truncate(size int64) error {
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// This truncation won't actually be validated until a write is issued.
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rw.offset = size
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return nil
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}
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func (rw *remoteWriter) Close() error {
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return rw.client.CloseSend()
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}
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