forked from coreos/etcd-operator
/
s3.go
143 lines (123 loc) · 3.48 KB
/
s3.go
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// Copyright 2016 The kube-etcd-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 s3
import (
"fmt"
"io"
"path"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
// S3 is a helper layer to wrap complex S3 logic.
type S3 struct {
bucket string
prefix string
client *s3.S3
}
// New returns a S3 translator from default shared config.
// Please refer to http://docs.aws.amazon.com/sdk-for-go/api/aws/session/
// for setting up credentials and configuration.
func New(bucket, prefix string) (*S3, error) {
return NewFromSessionOpt(bucket, prefix, session.Options{
// Setting this is equal to the AWS_SDK_LOAD_CONFIG environment variable was set.
// We want to save the work to set AWS_SDK_LOAD_CONFIG=1 outside.
SharedConfigState: session.SharedConfigEnable,
})
}
func NewFromSessionOpt(bucket, prefix string, so session.Options) (*S3, error) {
sess, err := session.NewSessionWithOptions(so)
if err != nil {
return nil, fmt.Errorf("new AWS session failed: %v", err)
}
cli := s3.New(sess)
return NewFromClient(bucket, prefix, cli), nil
}
func NewFromClient(bucket, prefix string, cli *s3.S3) *S3 {
return &S3{
bucket: bucket,
prefix: prefix,
client: cli,
}
}
func (s *S3) Put(key string, rs io.ReadSeeker) error {
_, err := s.client.PutObject(&s3.PutObjectInput{
Bucket: aws.String(s.bucket),
Key: aws.String(path.Join(s.prefix, key)),
Body: rs,
})
return err
}
func (s *S3) Get(key string) (io.ReadCloser, error) {
resp, err := s.client.GetObject(&s3.GetObjectInput{
Bucket: aws.String(s.bucket),
Key: aws.String(path.Join(s.prefix, key)),
})
if err != nil {
return nil, err
}
return resp.Body, nil
}
func (s *S3) Delete(key string) error {
_, err := s.client.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(s.bucket),
Key: aws.String(path.Join(s.prefix, key)),
})
return err
}
func (s *S3) List() ([]string, error) {
_, l, err := s.list(s.prefix)
return l, err
}
func (s *S3) list(prefix string) (int64, []string, error) {
resp, err := s.client.ListObjects(&s3.ListObjectsInput{
Bucket: aws.String(s.bucket),
// s3 doesn't have dir. It only recognizes prefix.
// Thus "a/b" has prefix "a/"
Prefix: aws.String(prefix + "/"),
})
if err != nil {
return -1, nil, err
}
keys := []string{}
var size int64
for _, key := range resp.Contents {
k := (*key.Key)[len(*resp.Prefix):]
keys = append(keys, k)
size += *key.Size
}
return size, keys, nil
}
func (s *S3) TotalSize() (int64, error) {
size, _, err := s.list(s.prefix)
return size, err
}
func (s *S3) CopyPrefix(from string) error {
_, keys, err := s.list(from)
if err != nil {
return err
}
for _, key := range keys {
req := &s3.CopyObjectInput{
Bucket: aws.String(s.bucket),
Key: aws.String(path.Join(s.prefix, key)),
CopySource: aws.String(path.Join(s.bucket, from, key)),
}
_, err := s.client.CopyObject(req)
if err != nil {
return err
}
}
return nil
}