mirror of
https://github.com/restic/restic.git
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231 lines
5.3 KiB
Go
231 lines
5.3 KiB
Go
package s3
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import (
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"bytes"
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"errors"
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"io"
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"strings"
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"github.com/minio/minio-go"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/debug"
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)
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const connLimit = 10
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const backendPrefix = "restic"
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func s3path(t backend.Type, name string) string {
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if t == backend.Config {
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return backendPrefix + "/" + string(t)
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}
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return backendPrefix + "/" + string(t) + "/" + name
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}
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// s3 is a backend which stores the data on an S3 endpoint.
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type s3 struct {
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client minio.CloudStorageClient
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connChan chan struct{}
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bucketname string
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}
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// Open opens the S3 backend at bucket and region. The bucket is created if it
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// does not exist yet.
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func Open(cfg Config) (backend.Backend, error) {
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debug.Log("s3.Open", "open, config %#v", cfg)
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client, err := minio.New(cfg.Endpoint, cfg.KeyID, cfg.Secret, cfg.UseHTTP)
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if err != nil {
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return nil, err
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}
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be := &s3{client: client, bucketname: cfg.Bucket}
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be.createConnections()
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if err := client.BucketExists(cfg.Bucket); err != nil {
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debug.Log("s3.Open", "BucketExists(%v) returned err %v, trying to create the bucket", cfg.Bucket, err)
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// create new bucket with default ACL in default region
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err = client.MakeBucket(cfg.Bucket, "", "")
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if err != nil {
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return nil, err
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}
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}
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return be, nil
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}
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func (be *s3) createConnections() {
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be.connChan = make(chan struct{}, connLimit)
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for i := 0; i < connLimit; i++ {
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be.connChan <- struct{}{}
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}
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}
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// Location returns this backend's location (the bucket name).
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func (be *s3) Location() string {
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return be.bucketname
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}
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// Load returns the data stored in the backend for h at the given offset
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// and saves it in p. Load has the same semantics as io.ReaderAt.
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func (be s3) Load(h backend.Handle, p []byte, off int64) (int, error) {
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debug.Log("s3.Load", "%v, offset %v, len %v", h, off, len(p))
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path := s3path(h.Type, h.Name)
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obj, err := be.client.GetObject(be.bucketname, path)
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if err != nil {
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debug.Log("s3.GetReader", " err %v", err)
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return 0, err
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}
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if off > 0 {
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_, err = obj.Seek(off, 0)
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if err != nil {
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return 0, err
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}
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}
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<-be.connChan
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defer func() {
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be.connChan <- struct{}{}
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}()
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return io.ReadFull(obj, p)
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}
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// Save stores data in the backend at the handle.
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func (be s3) Save(h backend.Handle, p []byte) (err error) {
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if err := h.Valid(); err != nil {
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return err
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}
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debug.Log("s3.Save", "%v bytes at %d", len(p), h)
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path := s3path(h.Type, h.Name)
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// Check key does not already exist
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_, err = be.client.StatObject(be.bucketname, path)
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if err == nil {
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debug.Log("s3.blob.Finalize()", "%v already exists", h)
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return errors.New("key already exists")
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}
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<-be.connChan
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defer func() {
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be.connChan <- struct{}{}
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}()
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debug.Log("s3.Save", "PutObject(%v, %v, %v, %v)",
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be.bucketname, path, int64(len(p)), "binary/octet-stream")
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n, err := be.client.PutObject(be.bucketname, path, bytes.NewReader(p), "binary/octet-stream")
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debug.Log("s3.Save", "%v -> %v bytes, err %#v", path, n, err)
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return err
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}
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// Stat returns information about a blob.
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func (be s3) Stat(h backend.Handle) (backend.BlobInfo, error) {
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debug.Log("s3.Stat", "%v")
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path := s3path(h.Type, h.Name)
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obj, err := be.client.GetObject(be.bucketname, path)
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if err != nil {
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debug.Log("s3.Stat", "GetObject() err %v", err)
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return backend.BlobInfo{}, err
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}
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fi, err := obj.Stat()
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if err != nil {
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debug.Log("s3.Stat", "Stat() err %v", err)
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return backend.BlobInfo{}, err
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}
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return backend.BlobInfo{Size: fi.Size}, nil
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}
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// Test returns true if a blob of the given type and name exists in the backend.
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func (be *s3) Test(t backend.Type, name string) (bool, error) {
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found := false
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path := s3path(t, name)
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_, err := be.client.StatObject(be.bucketname, path)
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if err == nil {
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found = true
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}
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// If error, then not found
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return found, nil
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}
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// Remove removes the blob with the given name and type.
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func (be *s3) Remove(t backend.Type, name string) error {
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path := s3path(t, name)
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err := be.client.RemoveObject(be.bucketname, path)
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debug.Log("s3.Remove", "%v %v -> err %v", t, name, err)
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return err
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}
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// List returns a channel that yields all names of blobs of type t. A
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// goroutine is started for this. If the channel done is closed, sending
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// stops.
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func (be *s3) List(t backend.Type, done <-chan struct{}) <-chan string {
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debug.Log("s3.List", "listing %v", t)
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ch := make(chan string)
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prefix := s3path(t, "")
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listresp := be.client.ListObjects(be.bucketname, prefix, true, done)
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go func() {
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defer close(ch)
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for obj := range listresp {
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m := strings.TrimPrefix(obj.Key, prefix)
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if m == "" {
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continue
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}
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select {
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case ch <- m:
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case <-done:
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return
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}
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}
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}()
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return ch
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}
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// Remove keys for a specified backend type.
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func (be *s3) removeKeys(t backend.Type) error {
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done := make(chan struct{})
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defer close(done)
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for key := range be.List(backend.Data, done) {
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err := be.Remove(backend.Data, key)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Delete removes all restic keys in the bucket. It will not remove the bucket itself.
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func (be *s3) Delete() error {
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alltypes := []backend.Type{
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backend.Data,
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backend.Key,
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backend.Lock,
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backend.Snapshot,
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backend.Index}
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for _, t := range alltypes {
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err := be.removeKeys(t)
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if err != nil {
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return nil
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}
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}
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return be.Remove(backend.Config, "")
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}
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// Close does nothing
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func (be *s3) Close() error { return nil }
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