GRPC: use port 50091 by default

swh/graph/http_server.py

@@ -316,11 +316,11 @@ class CountVisitNodesView(CountView):
     pass
 
 
-def make_app(config=None, rpc_url=None, **kwargs):
+def make_app(config=None, rpc_url=None, spawn_rpc_port=50091, **kwargs):
     app = GraphServerApp(**kwargs)
 
     if rpc_url is None:
-        app["local_server"], port = spawn_java_rpc_server(config)
+        app["local_server"], port = spawn_java_rpc_server(config, port=spawn_rpc_port)
         rpc_url = f"localhost:{port}"
 
     app.add_routes(

swh/graph/tests/conftest.py

@@ -29,7 +29,7 @@ class GraphServerProcess(multiprocessing.Process):
         try:
             config = {"graph": {"path": TEST_GRAPH_PATH}}
             with loop_context() as loop:
-                app = make_app(config=config, debug=True)
+                app = make_app(config=config, debug=True, spawn_rpc_port=None)
                 client = TestClient(TestServer(app), loop=loop)
                 loop.run_until_complete(client.start_server())
                 url = client.make_url("/graph/")