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s3.go
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s3.go
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// Package s3backupstorage implements the BackupStorage interface for AWS S3.
//
// AWS access credentials are configured via standard AWS means, such as:
// - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables
// - credentials file at ~/.aws/credentials
// - if running on an EC2 instance, an IAM role
// See details at http://blogs.aws.amazon.com/security/post/Tx3D6U6WSFGOK2H/A-New-and-Standardized-Way-to-Manage-Credentials-in-the-AWS-SDKs
package s3backupstorage
import (
"flag"
"fmt"
"io"
"sort"
"strings"
"sync"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/youtube/vitess/go/vt/concurrency"
"github.com/youtube/vitess/go/vt/mysqlctl/backupstorage"
)
var (
// AWS API region
region = flag.String("s3_backup_aws_region", "us-east-1", "AWS region to use")
// bucket is where the backups will go.
bucket = flag.String("s3_backup_storage_bucket", "", "S3 bucket to use for backups")
// root is a prefix added to all object names.
root = flag.String("s3_backup_storage_root", "", "root prefix for all backup-related object names")
// path component delimiter
delimiter = "/"
)
type S3BackupHandle struct {
client *s3.S3
bs *S3BackupStorage
dir string
name string
readOnly bool
errors concurrency.AllErrorRecorder
waitGroup sync.WaitGroup
}
func (bh *S3BackupHandle) Directory() string {
return bh.dir
}
func (bh *S3BackupHandle) Name() string {
return bh.name
}
func (bh *S3BackupHandle) AddFile(filename string) (io.WriteCloser, error) {
if bh.readOnly {
return nil, fmt.Errorf("AddFile cannot be called on read-only backup")
}
reader, writer := io.Pipe()
bh.waitGroup.Add(1)
go func() {
defer bh.waitGroup.Done()
uploader := s3manager.NewUploaderWithClient(bh.client)
object := objName(bh.dir, bh.name, filename)
_, err := uploader.Upload(&s3manager.UploadInput{
Bucket: bucket,
Key: object,
Body: reader,
})
if err != nil {
reader.CloseWithError(err)
bh.errors.RecordError(err)
}
}()
return writer, nil
}
func (bh *S3BackupHandle) EndBackup() error {
if bh.readOnly {
return fmt.Errorf("EndBackup cannot be called on read-only backup")
}
bh.waitGroup.Wait()
return bh.errors.Error()
}
func (bh *S3BackupHandle) AbortBackup() error {
if bh.readOnly {
return fmt.Errorf("AbortBackup cannot be called on read-only backup")
}
return bh.bs.RemoveBackup(bh.dir, bh.name)
}
func (bh *S3BackupHandle) ReadFile(filename string) (io.ReadCloser, error) {
if !bh.readOnly {
return nil, fmt.Errorf("ReadFile cannot be called on read-write backup")
}
object := objName(bh.dir, bh.name, filename)
out, err := bh.client.GetObject(&s3.GetObjectInput{
Bucket: bucket,
Key: object,
})
if err != nil {
return nil, err
}
return out.Body, nil
}
var _ backupstorage.BackupHandle = (*S3BackupHandle)(nil)
type S3BackupStorage struct {
_client *s3.S3
mu sync.Mutex
}
func (bs *S3BackupStorage) ListBackups(dir string) ([]backupstorage.BackupHandle, error) {
c, err := bs.client()
if err != nil {
return nil, err
}
searchPrefix := objName(dir, "")
query := &s3.ListObjectsV2Input{
Bucket: bucket,
Delimiter: &delimiter,
Prefix: searchPrefix,
}
var subdirs []string
for {
objs, err := c.ListObjectsV2(query)
if err != nil {
return nil, err
}
for _, prefix := range objs.CommonPrefixes {
subdir := strings.TrimPrefix(*prefix.Prefix, *searchPrefix)
subdir = strings.TrimSuffix(subdir, delimiter)
subdirs = append(subdirs, subdir)
}
if objs.NextContinuationToken == nil {
break
}
query.ContinuationToken = objs.NextContinuationToken
}
// Backups must be returned in order, oldest first.
sort.Strings(subdirs)
result := make([]backupstorage.BackupHandle, 0, len(subdirs))
for _, subdir := range subdirs {
result = append(result, &S3BackupHandle{
client: c,
bs: bs,
dir: dir,
name: subdir,
readOnly: true,
})
}
return result, nil
}
func (bs *S3BackupStorage) StartBackup(dir, name string) (backupstorage.BackupHandle, error) {
c, err := bs.client()
if err != nil {
return nil, err
}
return &S3BackupHandle{
client: c,
bs: bs,
dir: dir,
name: name,
readOnly: false,
}, nil
}
func (bs *S3BackupStorage) RemoveBackup(dir, name string) error {
c, err := bs.client()
if err != nil {
return err
}
query := &s3.ListObjectsV2Input{
Bucket: bucket,
Prefix: objName(dir, ""),
}
for {
objs, err := c.ListObjectsV2(query)
if err != nil {
return err
}
objIds := make([]*s3.ObjectIdentifier, 0, len(objs.Contents))
for _, obj := range objs.Contents {
objIds = append(objIds, &s3.ObjectIdentifier{
Key: obj.Key,
})
}
quiet := true // return less in the Delete response
out, err := c.DeleteObjects(&s3.DeleteObjectsInput{
Bucket: bucket,
Delete: &s3.Delete{
Objects: objIds,
Quiet: &quiet,
},
})
if err != nil {
return err
}
for _, objError := range out.Errors {
return fmt.Errorf(objError.String())
}
if objs.NextContinuationToken == nil {
break
}
query.ContinuationToken = objs.NextContinuationToken
}
return nil
}
func (bs *S3BackupStorage) Close() error {
bs.mu.Lock()
defer bs.mu.Unlock()
bs._client = nil
return nil
}
var _ backupstorage.BackupStorage = (*S3BackupStorage)(nil)
func (bs *S3BackupStorage) client() (*s3.S3, error) {
bs.mu.Lock()
defer bs.mu.Unlock()
if bs._client == nil {
bs._client = s3.New(session.New(), &aws.Config{Region: aws.String(*region)})
if len(*bucket) == 0 {
return nil, fmt.Errorf("-s3_backup_storage_bucket required")
}
if _, err := bs._client.HeadBucket(&s3.HeadBucketInput{Bucket: bucket}); err != nil {
return nil, err
}
}
return bs._client, nil
}
func objName(parts ...string) *string {
res := ""
if *root != "" {
res += *root + delimiter
}
res += strings.Join(parts, delimiter)
return &res
}
func init() {
backupstorage.BackupStorageMap["s3"] = &S3BackupStorage{}
}