/
oss.go
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/
oss.go
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/*
* Copyright (c) 2022. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package backend
import (
"context"
"encoding/json"
"fmt"
"io"
"time"
"github.com/aliyun/aliyun-oss-go-sdk/oss"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
)
type OSSBackend struct {
// OSS storage does not support directory. Therefore add a prefix to each object
// to make it a path-like object.
objectPrefix string
bucket *oss.Bucket
forcePush bool
}
func newOSSBackend(rawConfig []byte, forcePush bool) (*OSSBackend, error) {
var configMap map[string]string
if err := json.Unmarshal(rawConfig, &configMap); err != nil {
return nil, errors.Wrap(err, "Parse OSS storage backend configuration")
}
endpoint, ok1 := configMap["endpoint"]
bucketName, ok2 := configMap["bucket_name"]
// Below fields are not mandatory.
accessKeyID := configMap["access_key_id"]
accessKeySecret := configMap["access_key_secret"]
objectPrefix := configMap["object_prefix"]
if !ok1 || !ok2 {
return nil, fmt.Errorf("no endpoint or bucket is specified")
}
client, err := oss.New(endpoint, accessKeyID, accessKeySecret)
if err != nil {
return nil, errors.Wrap(err, "Create client")
}
bucket, err := client.Bucket(bucketName)
if err != nil {
return nil, errors.Wrap(err, "Create bucket")
}
return &OSSBackend{
objectPrefix: objectPrefix,
bucket: bucket,
forcePush: forcePush,
}, nil
}
// Ported from https://github.com/aliyun/aliyun-oss-go-sdk/blob/v2.2.6/oss/utils.go#L259
func splitFileByPartSize(blobSize, chunkSize int64) ([]oss.FileChunk, error) {
if chunkSize <= 0 {
return nil, errors.New("invalid chunk size")
}
var chunkN = blobSize / chunkSize
if chunkN >= 10000 {
return nil, errors.New("too many parts, please increase chunk size")
}
var chunks []oss.FileChunk
var chunk = oss.FileChunk{}
for i := int64(0); i < chunkN; i++ {
chunk.Number = int(i + 1)
chunk.Offset = i * chunkSize
chunk.Size = chunkSize
chunks = append(chunks, chunk)
}
if blobSize%chunkSize > 0 {
chunk.Number = len(chunks) + 1
chunk.Offset = int64(len(chunks)) * chunkSize
chunk.Size = blobSize % chunkSize
chunks = append(chunks, chunk)
}
return chunks, nil
}
// Upload nydus blob to oss storage backend.
func (b *OSSBackend) push(ctx context.Context, cs content.Store, desc ocispec.Descriptor) error {
blobID := desc.Digest.Hex()
blobObjectKey := b.objectPrefix + blobID
ra, err := cs.ReaderAt(ctx, desc)
if err != nil {
return errors.Wrapf(err, "get reader for compression blob %q", desc.Digest)
}
defer ra.Close()
if exist, err := b.bucket.IsObjectExist(blobObjectKey); err != nil {
return errors.Wrap(err, "check object existence")
} else if exist && !b.forcePush {
return nil
}
chunks, err := splitFileByPartSize(ra.Size(), MultipartChunkSize)
if err != nil {
return errors.Wrap(err, "split blob by part num")
}
imur, err := b.bucket.InitiateMultipartUpload(blobObjectKey)
if err != nil {
return errors.Wrap(err, "initiate multipart upload")
}
partsChan := make(chan oss.UploadPart, len(chunks))
g := new(errgroup.Group)
for _, chunk := range chunks {
ck := chunk
g.Go(func() error {
p, err := b.bucket.UploadPart(imur, io.NewSectionReader(ra, ck.Offset, ck.Size), ck.Size, ck.Number)
if err != nil {
return errors.Wrap(err, "upload part")
}
partsChan <- p
return nil
})
}
if err := g.Wait(); err != nil {
_ = b.bucket.AbortMultipartUpload(imur)
close(partsChan)
return errors.Wrap(err, "upload parts")
}
close(partsChan)
parts := make([]oss.UploadPart, 0, 16)
for p := range partsChan {
parts = append(parts, p)
}
_, err = b.bucket.CompleteMultipartUpload(imur, parts)
if err != nil {
return errors.Wrap(err, "complete multipart upload")
}
return nil
}
func (b *OSSBackend) Push(ctx context.Context, cs content.Store, desc ocispec.Descriptor) error {
backoff := time.Second
for {
err := b.push(ctx, cs, desc)
if err != nil {
select {
case <-ctx.Done():
return err
default:
}
} else {
return nil
}
if backoff >= 8*time.Second {
return err
}
time.Sleep(backoff)
backoff *= 2
}
}
func (b *OSSBackend) Check(blobDigest digest.Digest) (string, error) {
blobID := blobDigest.Hex()
blobObjectKey := b.objectPrefix + blobID
if exist, err := b.bucket.IsObjectExist(blobObjectKey); err != nil {
return "", err
} else if exist {
return blobID, nil
}
return "", errdefs.ErrNotFound
}
func (b *OSSBackend) Type() string {
return BackendTypeOSS
}