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oss_writer.go
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/
oss_writer.go
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// Copyright 2019 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 (
"context"
"fmt"
"io"
"path"
"strconv"
"github.com/alex-laptiev-sp/etcd-operator/pkg/backup/util"
"github.com/aliyun/aliyun-oss-go-sdk/oss"
)
type ossWriter struct {
oss *oss.Client
}
// NewOSSWriter creates a oss writer.
func NewOSSWriter(oss *oss.Client) Writer {
return &ossWriter{oss: oss}
}
// Write writes the backup file to the given oss path, "<oss-bucket-name>/<key>".
func (ossw *ossWriter) Write(ctx context.Context, path string, r io.Reader) (int64, error) {
// TODO: support context.
bk, key, err := util.ParseBucketAndKey(path)
if err != nil {
return 0, err
}
// If bucket doesn't exist, we create it.
exist, err := ossw.oss.IsBucketExist(bk)
if err != nil {
return 0, err
} else if !exist {
if err = ossw.oss.CreateBucket(bk); err != nil {
return 0, fmt.Errorf("failed to create bucket, error: %v", err)
}
}
bucket, err := ossw.oss.Bucket(bk)
if err != nil {
return 0, err
}
if err = bucket.PutObject(key, r); err != nil {
return 0, err
}
rc, err := bucket.GetObject(key)
if err != nil {
return 0, fmt.Errorf("failed to get oss object: %v", err)
}
var resp *oss.Response
var ok bool
if resp, ok = rc.(*oss.Response); !ok {
return 0, fmt.Errorf("the response type from GetObject(%s) is not *oss.Response", key)
}
defer resp.Close()
clstr := resp.Headers.Get("content-length")
if clstr == "" {
return 0, fmt.Errorf("content-length not found in headers of response in GetObject")
}
cl, err := strconv.ParseInt(clstr, 10, 64)
if err != nil {
return 0, fmt.Errorf("invalid content-length: %s", clstr)
}
return cl, nil
}
func (ossw *ossWriter) List(ctx context.Context, basePath string) ([]string, error) {
// TODO: support context.
bk, key, err := util.ParseBucketAndKey(basePath)
if err != nil {
return nil, err
}
bucket, err := ossw.oss.Bucket(bk)
if err != nil {
return nil, err
}
var objKeys []string
marker := oss.Marker("")
prefix := oss.Prefix(key)
for {
resp, err := bucket.ListObjects(oss.MaxKeys(1000), marker, prefix)
if err != nil {
return nil, fmt.Errorf("failed to list objects: %v", err)
}
for _, obj := range resp.Objects {
objKeys = append(objKeys, path.Join(bk, obj.Key))
}
prefix = oss.Prefix(resp.Prefix)
marker = oss.Marker(resp.NextMarker)
if !resp.IsTruncated {
break
}
}
return objKeys, nil
}
func (ossw *ossWriter) Delete(ctx context.Context, path string) error {
// TODO: support context.
bk, key, err := util.ParseBucketAndKey(path)
if err != nil {
return err
}
bucket, err := ossw.oss.Bucket(bk)
if err != nil {
return err
}
return bucket.DeleteObject(key)
}