Make tornado histogram endpoint non-blocking

girder · Jan 24, 2025 · 06c09e7 · 06c09e7
1 parent 4434ceb
commit 06c09e7
Showing 1 changed file with 10 additions and 6 deletions.
diff --git a/large_image/tilesource/jupyter.py b/large_image/tilesource/jupyter.py
@@ -499,13 +499,17 @@ def get(self) -> None:
     class TileSourceHistogramHandler(tornado.web.RequestHandler):
         """REST endpoint to get image metadata."""
 
-        def get(self) -> None:
+        async def get(self) -> None:
             kwargs = {k: ast.literal_eval(self.get_argument(k)) for k in self.request.arguments}
-            histogram = manager.tile_source._unstyled.histogram(  # type: ignore[attr-defined]
-                **kwargs,
-            ).get('histogram', [{}])
-            self.write(json.dumps(histogram, cls=NumpyEncoder))
-            self.set_header('Content-Type', 'application/json')
+
+            def fetch():
+                histogram = manager.tile_source._unstyled.histogram(  # type: ignore[attr-defined]
+                    **kwargs,
+                ).get('histogram', [{}])
+                self.write(json.dumps(histogram, cls=NumpyEncoder))
+                self.set_header('Content-Type', 'application/json')
+
+            await tornado.ioloop.IOLoop.current().run_in_executor(None, fetch)
 
     class TileSourceTileHandler(tornado.web.RequestHandler):
         """REST endpoint to serve tiles from image in slippy maps standard."""