retry on unauthorized chunk push

The token printed for authorized requests has a lifetime of 1h. If an
upload exceeds 1h, a chunk push will fail since the token is created on
a "start upload" request.

This replaces the Pipe with SectionReader which is simpler and
implements Seek, a requirement for makeRequestWithRetry. This is
slightly worse than using a Pipe since the progress update is directly
tied to the chunk size instead of controlled separately.

server/images.go

@@ -1181,66 +1181,45 @@ func uploadBlobChunked(ctx context.Context, mp ModelPath, url string, layer *Lay
 	}
 	defer f.Close()
 
-	completed := 0
+	var completed int64
 	chunkSize := 10 * 1024 * 1024
 
 	for {
-		r, w := io.Pipe()
-		defer r.Close()
-
-		limit := completed + chunkSize
-		if chunkSize >= layer.Size-completed {
-			limit = layer.Size
-			chunkSize = layer.Size - completed
+		chunk := int64(layer.Size) - completed
+		if chunk > int64(chunkSize) {
+			chunk = int64(chunkSize)
 		}
 
-		go func() {
-			defer w.Close()
-			for {
-				n, err := io.CopyN(w, f, 1024*1024)
+		sectionReader := io.NewSectionReader(f, int64(completed), chunk)
+
+		headers := make(map[string]string)
+		headers["Content-Type"] = "application/octet-stream"
+		headers["Content-Length"] = strconv.Itoa(int(chunk))
+		headers["Content-Range"] = fmt.Sprintf("%d-%d", completed, completed+sectionReader.Size()-1)
+
+		resp, err := makeRequestWithRetry(ctx, "PATCH", url, headers, sectionReader, regOpts)
 		if err != nil && !errors.Is(err, io.EOF) {
 			fn(api.ProgressResponse{
-						Status:    fmt.Sprintf("error copying pipe: %v", err),
+				Status:    fmt.Sprintf("error uploading chunk: %v", err),
 				Digest:    layer.Digest,
 				Total:     layer.Size,
-						Completed: completed,
+				Completed: int(completed),
 			})
-					return
-				}
 
-				completed += int(n)
+			return err
+		}
+		defer resp.Body.Close()
 
+		completed += sectionReader.Size()
 		fn(api.ProgressResponse{
 			Status:    fmt.Sprintf("uploading %s", layer.Digest),
 			Digest:    layer.Digest,
 			Total:     layer.Size,
-					Completed: completed,
+			Completed: int(completed),
 		})
 
-				if completed >= limit {
-					return
-				}
-			}
-		}()
-
-		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)
-
-		resp, err := makeRequest(ctx, "PATCH", url, headers, r, regOpts)
-		if err != nil {
-			return err
-		}
-		defer resp.Body.Close()
-
-		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 {
+		if completed >= int64(layer.Size) {
 			break
 		}
 	}