func validate(cli storage.BlobStorageClient, blob string, startByte, endByte int64, data []byte) error { url := cli.GetBlobURL(cnt, blob) reader, err := cli.GetBlob(cnt, blob) if err != nil { return fmt.Errorf("Failed to read from %s: %s\n", url, err.Error()) } defer reader.Close() dataRead, err := ioutil.ReadAll(reader) if err != nil { return fmt.Errorf("Failed to read from %s: %s\n", url, err.Error()) } same := true for i := startByte; i <= endByte; i++ { if data[i] != dataRead[i] { same = false } } if !same { return fmt.Errorf("Failed to read data properly from %s: %s\n", url, err.Error()) } return nil }