Include content length in the response of Get and GetRange

Author: ashwanthgoli

objstore.go

@@ -829,3 +829,13 @@ func (t *timingReaderWriterTo) WriteTo(w io.Writer) (n int64, err error) {
 	t.timingReader.updateMetrics(int(n), err)
 	return n, err
 }
+
+type ObjectSizerReadCloser struct {
+	io.ReadCloser
+	Size int64
+}
+
+// ObjectSize implement ObjectSizer.
+func (o ObjectSizerReadCloser) ObjectSize() (int64, error) {
+	return o.Size, nil
+}

providers/azure/azure.go

@@ -273,7 +273,7 @@ func (b *Bucket) getBlobReader(ctx context.Context, name string, httpRange blob.
 		return nil, errors.Wrapf(err, "cannot download blob, address: %s", blobClient.URL())
 	}
 	retryOpts := azblob.RetryReaderOptions{MaxRetries: int32(b.readerMaxRetries)}
-	return resp.NewRetryReader(ctx, &retryOpts), nil
+	return objstore.ObjectSizerReadCloser{ReadCloser: resp.NewRetryReader(ctx, &retryOpts), Size: *resp.ContentLength}, nil
 }
 
 // Get returns a reader for the given object name.

providers/bos/bos.go

@@ -308,7 +308,7 @@ func (b *Bucket) getRange(_ context.Context, bucketName, objectKey string, off,
 		return nil, err
 	}
 
-	return obj.Body, nil
+	return objstore.ObjectSizerReadCloser{ReadCloser: obj.Body, Size: obj.ContentLength}, err
 }
 
 func configFromEnv() Config {

providers/cos/cos.go

@@ -320,20 +320,10 @@ func (b *Bucket) getRange(ctx context.Context, name string, off, length int64) (
 		return nil, err
 	}
 	// Add size info into reader to pass it to Upload function.
-	r := objectSizerReadCloser{ReadCloser: resp.Body, size: resp.ContentLength}
+	r := objstore.ObjectSizerReadCloser{ReadCloser: resp.Body, Size: resp.ContentLength}
 	return r, nil
 }
 
-type objectSizerReadCloser struct {
-	io.ReadCloser
-	size int64
-}
-
-// ObjectSize implement objstore.ObjectSizer.
-func (o objectSizerReadCloser) ObjectSize() (int64, error) {
-	return o.size, nil
-}
-
 // Get returns a reader for the given object name.
 func (b *Bucket) Get(ctx context.Context, name string) (io.ReadCloser, error) {
 	return b.getRange(ctx, name, 0, -1)

providers/filesystem/filesystem.go

@@ -150,8 +150,12 @@ func (b *Bucket) GetRange(ctx context.Context, name string, off, length int64) (
 		return nil, errors.New("object name is empty")
 	}
 
-	file := filepath.Join(b.rootDir, name)
-	if _, err := os.Stat(file); err != nil {
+	var (
+		file = filepath.Join(b.rootDir, name)
+		stat os.FileInfo
+		err  error
+	)
+	if stat, err = os.Stat(file); err != nil {
 		return nil, errors.Wrapf(err, "stat %s", file)
 	}
 
@@ -171,7 +175,10 @@ func (b *Bucket) GetRange(ctx context.Context, name string, off, length int64) (
 		return f, nil
 	}
 
-	return &rangeReaderCloser{Reader: io.LimitReader(f, length), f: f}, nil
+	return objstore.ObjectSizerReadCloser{
+		ReadCloser: &rangeReaderCloser{Reader: io.LimitReader(f, length),
+			f: f,
+		}, Size: stat.Size()}, nil
 }
 
 // Exists checks if the given directory exists in memory.

providers/gcs/gcs.go

@@ -226,12 +226,22 @@ func (b *Bucket) Iter(ctx context.Context, dir string, f func(string) error, opt
 
 // Get returns a reader for the given object name.
 func (b *Bucket) Get(ctx context.Context, name string) (io.ReadCloser, error) {
-	return b.bkt.Object(name).NewReader(ctx)
+	r, err := b.bkt.Object(name).NewReader(ctx)
+	if err != nil {
+		return r, err
+	}
+
+	return objstore.ObjectSizerReadCloser{ReadCloser: r, Size: r.Attrs.Size}, nil
 }
 
 // GetRange returns a new range reader for the given object name and range.
 func (b *Bucket) GetRange(ctx context.Context, name string, off, length int64) (io.ReadCloser, error) {
-	return b.bkt.Object(name).NewRangeReader(ctx, off, length)
+	r, err := b.bkt.Object(name).NewRangeReader(ctx, off, length)
+	if err != nil {
+		return r, err
+	}
+
+	return objstore.ObjectSizerReadCloser{ReadCloser: r, Size: r.Attrs.Size}, nil
 }
 
 // Attributes returns information about the specified object.

providers/obs/obs.go

@@ -299,7 +299,7 @@ func (b *Bucket) getRange(_ context.Context, name string, off, length int64) (io
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to get object")
 	}
-	return output.Body, nil
+	return objstore.ObjectSizerReadCloser{ReadCloser: output.Body, Size: output.ContentLength}, nil
 }
 
 // Exists checks if the given object exists in the bucket.

providers/oci/oci.go

@@ -134,7 +134,7 @@ func (b *Bucket) Get(ctx context.Context, name string) (io.ReadCloser, error) {
 	if err != nil {
 		return nil, err
 	}
-	return response.Content, nil
+	return objstore.ObjectSizerReadCloser{ReadCloser: response.Content, Size: *response.ContentLength}, nil
 }
 
 // GetRange returns a new range reader for the given object name and range.
@@ -164,7 +164,7 @@ func (b *Bucket) GetRange(ctx context.Context, name string, offset, length int64
 	if err != nil {
 		return nil, err
 	}
-	return response.Content, nil
+	return objstore.ObjectSizerReadCloser{ReadCloser: response.Content, Size: *response.ContentLength}, nil
 }
 
 // Upload the contents of the reader as an object into the bucket.

providers/s3/s3.go

@@ -439,10 +439,17 @@ func (b *Bucket) getRange(ctx context.Context, name string, off, length int64) (
 	}
 
 	// StatObject to see if the object exists and we have permissions to read it
-	if _, err := b.client.StatObject(ctx, b.name, name, *opts); err != nil {
+	var stat minio.ObjectInfo
+	if stat, err = b.client.StatObject(ctx, b.name, name, *opts); err != nil {
 		return nil, err
 	}
-	return b.client.GetObject(ctx, b.name, name, *opts)
+
+	o, err := b.client.GetObject(ctx, b.name, name, *opts)
+	if err != nil {
+		return o, err
+	}
+
+	return objstore.ObjectSizerReadCloser{ReadCloser: o, Size: stat.Size}, nil
 }
 
 // Get returns a reader for the given object name.