reimplement chunked uploads

server/images.go

@@ -1173,7 +1173,6 @@ func checkBlobExistence(ctx context.Context, mp ModelPath, digest string, regOpt
 func uploadBlobChunked(ctx context.Context, mp ModelPath, url string, layer *Layer, regOpts *RegistryOptions, fn func(api.ProgressResponse)) error {
 	// TODO allow resumability
 	// TODO allow canceling uploads via DELETE
-	// TODO allow cross repo blob mount
 
 	fp, err := GetBlobsPath(layer.Digest)
 	if err != nil {
@@ -1186,49 +1185,78 @@ func uploadBlobChunked(ctx context.Context, mp ModelPath, url string, layer *Lay
 	}
 	defer f.Close()
 
-	totalUploaded := 0
+	completed := 0
+	chunkSize := 10 * 1024 * 1024
 
-	r, w := io.Pipe()
-	defer r.Close()
+	for {
+		r, w := io.Pipe()
+		defer r.Close()
+
+		limit := completed + chunkSize
+		if chunkSize >= layer.Size-completed {
+			limit = layer.Size
+			chunkSize = layer.Size - completed
+		}
+
+		go func() {
+			defer w.Close()
+			for {
+				n, err := io.CopyN(w, f, 1024*1024)
+				if err != nil && !errors.Is(err, io.EOF) {
+					fn(api.ProgressResponse{
+						Status:    fmt.Sprintf("error copying pipe: %v", err),
+						Digest:    layer.Digest,
+						Total:     layer.Size,
+						Completed: completed,
+					})
+					return
+				}
+
+				completed += int(n)
 
-	go func() {
-		defer w.Close()
-		for {
-			n, err := io.CopyN(w, f, 1024*1024)
-			if err != nil && !errors.Is(err, io.EOF) {
 				fn(api.ProgressResponse{
-					Status:    fmt.Sprintf("error copying pipe: %v", err),
+					Status:    fmt.Sprintf("uploading %s", layer.Digest),
 					Digest:    layer.Digest,
 					Total:     layer.Size,
-					Completed: totalUploaded,
+					Completed: completed,
 				})
-				return
+
+				if completed >= limit {
+					return
+				}
 			}
+		}()
 
-			totalUploaded += int(n)
+		headers := make(map[string]string)
+		headers["Content-Type"] = "application/octet-stream"
+		headers["Content-Length"] = strconv.Itoa(chunkSize)
+		headers["Content-Range"] = fmt.Sprintf("%d-%d", completed, limit-1)
 
-			fn(api.ProgressResponse{
-				Status:    fmt.Sprintf("uploading %s", layer.Digest),
-				Digest:    layer.Digest,
-				Total:     layer.Size,
-				Completed: totalUploaded,
-			})
+		resp, err := makeRequest(ctx, "PATCH", url, headers, r, regOpts)
+		if err != nil {
+			return err
+		}
+		defer resp.Body.Close()
 
-			if totalUploaded >= layer.Size {
-				return
-			}
+		if resp.StatusCode != http.StatusAccepted {
+			body, _ := io.ReadAll(resp.Body)
+			return fmt.Errorf("on finish upload registry responded with code %d: %v", resp.StatusCode, string(body))
 		}
-	}()
+
+		url = resp.Header.Get("Location")
+		if completed >= layer.Size {
+			break
+		}
+	}
 
 	url = fmt.Sprintf("%s&digest=%s", url, layer.Digest)
 
 	headers := make(map[string]string)
 	headers["Content-Type"] = "application/octet-stream"
-	headers["Content-Range"] = fmt.Sprintf("0-%d", layer.Size-1)
-	headers["Content-Length"] = strconv.Itoa(int(layer.Size))
+	headers["Content-Length"] = "0"
 
 	// finish the upload
-	resp, err := makeRequest(ctx, "PUT", url, headers, r, regOpts)
+	resp, err := makeRequest(ctx, "PUT", url, headers, nil, regOpts)
 	if err != nil {
 		log.Printf("couldn't finish upload: %v", err)
 		return err