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abs_writer.go
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/
abs_writer.go
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// Copyright 2017 The etcd-operator Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package writer
import (
"bytes"
"context"
"encoding/base64"
"fmt"
"io"
"github.com/coreos/etcd-operator/pkg/backup/util"
"github.com/Azure/azure-sdk-for-go/storage"
"github.com/pborman/uuid"
)
var _ Writer = &absWriter{}
type absWriter struct {
abs *storage.BlobStorageClient
}
// NewABSWriter creates a abs writer.
func NewABSWriter(abs *storage.BlobStorageClient) Writer {
return &absWriter{abs}
}
const (
// AzureBlobBlockChunkLimitInBytes 100MiB is the limit
AzureBlobBlockChunkLimitInBytes = 100 * 1024 * 1024
)
// Write writes the backup file to the given abs path, "<abs-container-name>/<key>".
func (absw *absWriter) Write(ctx context.Context, path string, r io.Reader) (int64, error) {
// TODO: support context.
container, key, err := util.ParseBucketAndKey(path)
if err != nil {
return 0, err
}
containerRef := absw.abs.GetContainerReference(container)
containerExists, err := containerRef.Exists()
if err != nil {
return 0, err
}
if !containerExists {
return 0, fmt.Errorf("container %v does not exist", container)
}
blob := containerRef.GetBlobReference(key)
err = blob.CreateBlockBlob(&storage.PutBlobOptions{})
if err != nil {
return 0, err
}
buf := new(bytes.Buffer)
buf.ReadFrom(r)
len := len(buf.Bytes())
chunckCount := len/AzureBlobBlockChunkLimitInBytes + 1
blocks := make([]storage.Block, 0, chunckCount)
for i := 0; i < chunckCount; i++ {
blockID := base64.StdEncoding.EncodeToString([]byte(uuid.New()))
blocks = append(blocks, storage.Block{ID: blockID, Status: storage.BlockStatusLatest})
start := i * AzureBlobBlockChunkLimitInBytes
end := (i + 1) * AzureBlobBlockChunkLimitInBytes
if len < end {
end = len
}
chunk := buf.Bytes()[start:end]
err = blob.PutBlock(blockID, chunk, &storage.PutBlockOptions{})
if err != nil {
return 0, err
}
}
err = blob.PutBlockList(blocks, &storage.PutBlockListOptions{})
if err != nil {
return 0, err
}
_, err = blob.Get(&storage.GetBlobOptions{})
if err != nil {
return 0, err
}
return blob.Properties.ContentLength, nil
}
func (absw *absWriter) List(ctx context.Context, basePath string) ([]string, error) {
// TODO: support context.
container, _, err := util.ParseBucketAndKey(basePath)
if err != nil {
return nil, err
}
containerRef := absw.abs.GetContainerReference(container)
containerExists, err := containerRef.Exists()
if err != nil {
return nil, err
}
if !containerExists {
return nil, fmt.Errorf("container %v does not exist", container)
}
blobs, err := containerRef.ListBlobs(
storage.ListBlobsParameters{Prefix: basePath})
if err != nil {
return nil, err
}
blobKeys := []string{}
for _, blob := range blobs.Blobs {
blobKeys = append(blobKeys, container+"/"+blob.Name)
}
return blobKeys, nil
}
func (absw *absWriter) Delete(ctx context.Context, path string) error {
// TODO: support context.
container, key, err := util.ParseBucketAndKey(path)
if err != nil {
return err
}
containerRef := absw.abs.GetContainerReference(container)
containerExists, err := containerRef.Exists()
if err != nil {
return err
}
if !containerExists {
return fmt.Errorf("container %v does not exist", container)
}
blob := containerRef.GetBlobReference(key)
return blob.Delete(&storage.DeleteBlobOptions{})
}