1 files changed, 48 insertions, 0 deletions
diff --git a/tvix/nar-bridge/pkg/server/blob_upload.go b/tvix/nar-bridge/pkg/server/blob_upload.go
new file mode 100644
index 000000000000..fe554f5a5a2b
--- /dev/null
+++ b/tvix/nar-bridge/pkg/server/blob_upload.go
@@ -0,0 +1,48 @@
+package server
+
+import (
+	storev1pb "code.tvl.fyi/tvix/store/protos"
+	"context"
+	"encoding/base64"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"io"
+)
+
+// this returns a callback function that can be used as fileCb
+// for the reader.Import function call
+func genBlobServiceWriteCb(ctx context.Context, blobServiceClient storev1pb.BlobServiceClient) func(io.Reader) error {
+	return func(fileReader io.Reader) error {
+		// Read from fileReader into a buffer.
+		// We currently buffer all contents and send them to blobServiceClient at once,
+		// but that's about to change.
+		contents, err := io.ReadAll(fileReader)
+		if err != nil {
+			return fmt.Errorf("unable to read all contents from file reader: %w", err)
+		}
+
+		log := log.WithField("blob_size", len(contents))
+
+		log.Infof("about to upload blob")
+
+		putter, err := blobServiceClient.Put(ctx)
+		if err != nil {
+			// return error to the importer
+			return fmt.Errorf("error from blob service: %w", err)
+		}
+		err = putter.Send(&storev1pb.BlobChunk{
+			Data: contents,
+		})
+		if err != nil {
+			return fmt.Errorf("putting blob chunk: %w", err)
+		}
+		resp, err := putter.CloseAndRecv()
+		if err != nil {
+			return fmt.Errorf("close blob putter: %w", err)
+		}
+
+		log.WithField("digest", base64.StdEncoding.EncodeToString(resp.GetDigest())).Info("uploaded blob")
+
+		return nil
+	}
+}