Merge pull request #1038 from restic/s3-prevent-close

Improve GCS support

src/restic/backend/mem/mem_backend.go

@@ -8,7 +8,6 @@ import (
 	"restic"
 	"sync"
 
-	"restic/backend"
 	"restic/errors"
 
 	"restic/debug"
@@ -121,7 +120,7 @@ func (be *MemoryBackend) Load(ctx context.Context, h restic.Handle, length int,
 		buf = buf[:length]
 	}
 
-	return backend.Closer{Reader: bytes.NewReader(buf)}, nil
+	return ioutil.NopCloser(bytes.NewReader(buf)), nil
 }
 
 // Stat returns information about a file in the backend.

src/restic/backend/rest/rest.go

@@ -108,9 +108,8 @@ func (b *restBackend) Save(ctx context.Context, h restic.Handle, rd io.Reader) (
 	ctx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	// make sure that client.Post() cannot close the reader by wrapping it in
-	// backend.Closer, which has a noop method.
-	rd = backend.Closer{Reader: rd}
+	// make sure that client.Post() cannot close the reader by wrapping it
+	rd = ioutil.NopCloser(rd)
 
 	b.sem.GetToken()
 	resp, err := ctxhttp.Post(ctx, b.client, b.Filename(h), "binary/octet-stream", rd)

src/restic/backend/s3/s3.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"io/ioutil"
+	"net/url"
 	"os"
 	"path"
 	"restic"
@@ -14,16 +16,16 @@ import (
 	"restic/errors"
 
 	"github.com/minio/minio-go"
+	"github.com/minio/minio-go/pkg/s3utils"
 
 	"restic/debug"
 )
 
 // Backend stores data on an S3 endpoint.
 type Backend struct {
-	client     *minio.Client
-	sem        *backend.Semaphore
-	bucketname string
-	prefix     string
+	client *minio.Client
+	sem    *backend.Semaphore
+	cfg    Config
 	backend.Layout
 }
 
@@ -48,10 +50,9 @@ func Open(cfg Config) (restic.Backend, error) {
 	}
 
 	be := &Backend{
-		client:     client,
-		sem:        sem,
-		bucketname: cfg.Bucket,
-		prefix:     cfg.Prefix,
+		client: client,
+		sem:    sem,
+		cfg:    cfg,
 	}
 
 	client.SetCustomTransport(backend.Transport())
@@ -118,7 +119,7 @@ func (be *Backend) ReadDir(dir string) (list []os.FileInfo, err error) {
 	done := make(chan struct{})
 	defer close(done)
 
-	for obj := range be.client.ListObjects(be.bucketname, dir, false, done) {
+	for obj := range be.client.ListObjects(be.cfg.Bucket, dir, false, done) {
 		if obj.Key == "" {
 			continue
 		}
@@ -149,12 +150,25 @@ func (be *Backend) ReadDir(dir string) (list []os.FileInfo, err error) {
 
 // Location returns this backend's location (the bucket name).
 func (be *Backend) Location() string {
-	return be.Join(be.bucketname, be.prefix)
+	return be.Join(be.cfg.Bucket, be.cfg.Prefix)
 }
 
 // Path returns the path in the bucket that is used for this backend.
 func (be *Backend) Path() string {
-	return be.prefix
+	return be.cfg.Prefix
+}
+
+func (be *Backend) isGoogleCloudStorage() bool {
+	scheme := "https://"
+	if be.cfg.UseHTTP {
+		scheme = "http://"
+	}
+	url, err := url.Parse(scheme + be.cfg.Endpoint)
+	if err != nil {
+		panic(err)
+	}
+
+	return s3utils.IsGoogleEndpoint(*url)
 }
 
 // Save stores data in the backend at the handle.
@@ -168,15 +182,20 @@ func (be *Backend) Save(ctx context.Context, h restic.Handle, rd io.Reader) (err
 	objName := be.Filename(h)
 
 	// Check key does not already exist
-	_, err = be.client.StatObject(be.bucketname, objName)
+	_, err = be.client.StatObject(be.cfg.Bucket, objName)
 	if err == nil {
 		debug.Log("%v already exists", h)
 		return errors.New("key already exists")
 	}
 
+	// prevent GCS from closing the file
+	if be.isGoogleCloudStorage() {
+		rd = ioutil.NopCloser(rd)
+	}
+
 	be.sem.GetToken()
-	debug.Log("PutObject(%v, %v)", be.bucketname, objName)
-	n, err := be.client.PutObject(be.bucketname, objName, rd, "application/octet-stream")
+	debug.Log("PutObject(%v, %v)", be.cfg.Bucket, objName)
+	n, err := be.client.PutObject(be.cfg.Bucket, objName, rd, "application/octet-stream")
 	be.sem.ReleaseToken()
 
 	debug.Log("%v -> %v bytes, err %#v: %v", objName, n, err, err)
@@ -226,7 +245,7 @@ func (be *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
 	debug.Log("Load(%v) send range %v", h, byteRange)
 
 	coreClient := minio.Core{Client: be.client}
-	rd, _, err := coreClient.GetObject(be.bucketname, objName, headers)
+	rd, _, err := coreClient.GetObject(be.cfg.Bucket, objName, headers)
 	if err != nil {
 		be.sem.ReleaseToken()
 		return nil, err
@@ -250,7 +269,7 @@ func (be *Backend) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInf
 	objName := be.Filename(h)
 	var obj *minio.Object
 
-	obj, err = be.client.GetObject(be.bucketname, objName)
+	obj, err = be.client.GetObject(be.cfg.Bucket, objName)
 	if err != nil {
 		debug.Log("GetObject() err %v", err)
 		return restic.FileInfo{}, errors.Wrap(err, "client.GetObject")
@@ -277,7 +296,7 @@ func (be *Backend) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInf
 func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
 	found := false
 	objName := be.Filename(h)
-	_, err := be.client.StatObject(be.bucketname, objName)
+	_, err := be.client.StatObject(be.cfg.Bucket, objName)
 	if err == nil {
 		found = true
 	}
@@ -289,8 +308,13 @@ func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
 // Remove removes the blob with the given name and type.
 func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
 	objName := be.Filename(h)
-	err := be.client.RemoveObject(be.bucketname, objName)
+	err := be.client.RemoveObject(be.cfg.Bucket, objName)
 	debug.Log("Remove(%v) at %v -> err %v", h, objName, err)
+
+	if be.IsNotExist(err) {
+		err = nil
+	}
+
 	return errors.Wrap(err, "client.RemoveObject")
 }
 
@@ -308,7 +332,7 @@ func (be *Backend) List(ctx context.Context, t restic.FileType) <-chan string {
 		prefix += "/"
 	}
 
-	listresp := be.client.ListObjects(be.bucketname, prefix, true, ctx.Done())
+	listresp := be.client.ListObjects(be.cfg.Bucket, prefix, true, ctx.Done())
 
 	go func() {
 		defer close(ch)
@@ -372,11 +396,11 @@ func (be *Backend) Rename(h restic.Handle, l backend.Layout) error {
 	debug.Log("  %v -> %v", oldname, newname)
 
 	coreClient := minio.Core{Client: be.client}
-	err := coreClient.CopyObject(be.bucketname, newname, path.Join(be.bucketname, oldname), minio.CopyConditions{})
+	err := coreClient.CopyObject(be.cfg.Bucket, newname, path.Join(be.cfg.Bucket, oldname), minio.CopyConditions{})
 	if err != nil {
 		debug.Log("copy failed: %v", err)
 		return err
 	}
 
-	return be.client.RemoveObject(be.bucketname, oldname)
+	return be.client.RemoveObject(be.cfg.Bucket, oldname)
 }

src/restic/backend/s3/s3_test.go

@@ -103,6 +103,21 @@ type MinioTestConfig struct {
 	stopServer    func()
 }
 
+func openS3(t testing.TB, cfg MinioTestConfig) (be restic.Backend, err error) {
+	for i := 0; i < 10; i++ {
+		be, err = s3.Open(cfg.Config)
+		if err != nil {
+			t.Logf("s3 open: try %d: error %v", i, err)
+			time.Sleep(500 * time.Millisecond)
+			continue
+		}
+
+		break
+	}
+
+	return be, err
+}
+
 func newMinioTestSuite(ctx context.Context, t testing.TB) *test.Suite {
 	return &test.Suite{
 		// NewConfig returns a config for a new temporary backend that will be used in tests.
@@ -127,7 +142,7 @@ func newMinioTestSuite(ctx context.Context, t testing.TB) *test.Suite {
 		Create: func(config interface{}) (restic.Backend, error) {
 			cfg := config.(MinioTestConfig)
 
-			be, err := s3.Open(cfg.Config)
+			be, err := openS3(t, cfg)
 			if err != nil {
 				return nil, err
 			}

src/restic/backend/test/tests.go

@@ -446,11 +446,32 @@ func delayedRemove(b restic.Backend, h restic.Handle) error {
 	found, err := b.Test(context.TODO(), h)
 	for i := 0; found && i < 20; i++ {
 		found, err = b.Test(context.TODO(), h)
-		if found {
+		if err != nil {
+			return err
+		}
+
+		if !found {
+			break
+		}
+
+		time.Sleep(100 * time.Millisecond)
+	}
+	return err
+}
+
+func delayedList(t testing.TB, b restic.Backend, tpe restic.FileType, max int) restic.IDs {
+	list := restic.NewIDSet()
+	for i := 0; i < max; i++ {
+		for s := range b.List(context.TODO(), tpe) {
+			id := restic.TestParseID(s)
+			list.Insert(id)
+		}
+		if len(list) < max {
 			time.Sleep(100 * time.Millisecond)
 		}
 	}
-	return err
+
+	return list.List()
 }
 
 // TestBackend tests all functions of the backend.
@@ -548,12 +569,7 @@ func (s *Suite) TestBackend(t *testing.T) {
 			IDs = append(IDs, id)
 		}
 
-		list := restic.IDs{}
-
-		for s := range b.List(context.TODO(), tpe) {
-			list = append(list, restic.TestParseID(s))
-		}
-
+		list := delayedList(t, b, tpe, len(IDs))
 		if len(IDs) != len(list) {
 			t.Fatalf("wrong number of IDs returned: want %d, got %d", len(IDs), len(list))
 		}
@@ -581,7 +597,7 @@ func (s *Suite) TestBackend(t *testing.T) {
 
 				found, err = b.Test(context.TODO(), h)
 				test.OK(t, err)
-				test.Assert(t, !found, fmt.Sprintf("id %q not found after removal", id))
+				test.Assert(t, !found, fmt.Sprintf("id %q found after removal", id))
 			}
 		}
 	}

src/restic/backend/utils.go

@@ -29,16 +29,6 @@ func LoadAll(ctx context.Context, be restic.Backend, h restic.Handle) (buf []byt
 	return ioutil.ReadAll(rd)
 }
 
-// Closer wraps an io.Reader and adds a Close() method that does nothing.
-type Closer struct {
-	io.Reader
-}
-
-// Close is a no-op.
-func (c Closer) Close() error {
-	return nil
-}
-
 // LimitedReadCloser wraps io.LimitedReader and exposes the Close() method.
 type LimitedReadCloser struct {
 	io.ReadCloser