refactor(framework) Enable passing an existing Context to ServerApp startup function

src/py/flwr/server/run_serverapp.py

@@ -34,7 +34,6 @@
 from flwr.common.constant import DRIVER_API_DEFAULT_ADDRESS
 from flwr.common.logger import log, update_console_handler, warn_deprecated_feature
 from flwr.common.object_ref import load_app
-from flwr.common.typing import UserConfig
 from flwr.proto.fab_pb2 import GetFabRequest, GetFabResponse  # pylint: disable=E0611
 from flwr.proto.run_pb2 import (  # pylint: disable=E0611
     CreateRunRequest,
@@ -46,13 +45,14 @@
 from .server_app import LoadServerAppError, ServerApp
 
 
+# pylint: disable-next=too-many-arguments,too-many-positional-arguments
 def run(
     driver: Driver,
+    context: Context,
     server_app_dir: str,
-    server_app_run_config: UserConfig,
     server_app_attr: Optional[str] = None,
     loaded_server_app: Optional[ServerApp] = None,
-) -> None:
+) -> Context:
     """Run ServerApp with a given Driver."""
     if not (server_app_attr is None) ^ (loaded_server_app is None):
         raise ValueError(
@@ -78,15 +78,11 @@ def _load() -> ServerApp:
 
     server_app = _load()
 
-    # Initialize Context
-    context = Context(
-        node_id=0, node_config={}, state=RecordSet(), run_config=server_app_run_config
-    )
-
     # Call ServerApp
     server_app(driver=driver, context=context)
 
     log(DEBUG, "ServerApp finished running.")
+    return context
 
 
 # pylint: disable-next=too-many-branches,too-many-statements,too-many-locals
@@ -225,11 +221,19 @@ def run_server_app() -> None:
         root_certificates,
     )
 
+    # Initialize Context
+    context = Context(
+        node_id=0,
+        node_config={},
+        state=RecordSet(),
+        run_config=server_app_run_config,
+    )
+
     # Run the ServerApp with the Driver
     run(
         driver=driver,
+        context=context,
         server_app_dir=app_path,
-        server_app_run_config=server_app_run_config,
         server_app_attr=server_app_attr,
     )
 

src/py/flwr/simulation/run_simulation.py

@@ -29,7 +29,7 @@
 
 from flwr.cli.config_utils import load_and_validate
 from flwr.client import ClientApp
-from flwr.common import EventType, event, log, now
+from flwr.common import Context, EventType, RecordSet, event, log, now
 from flwr.common.config import get_fused_config_from_dir, parse_config_args
 from flwr.common.constant import RUN_ID_NUM_BYTES, Status
 from flwr.common.logger import (
@@ -40,7 +40,7 @@
 )
 from flwr.common.typing import Run, RunStatus, UserConfig
 from flwr.server.driver import Driver, InMemoryDriver
-from flwr.server.run_serverapp import run as run_server_app
+from flwr.server.run_serverapp import run as _run
 from flwr.server.server_app import ServerApp
 from flwr.server.superlink.fleet import vce
 from flwr.server.superlink.fleet.vce.backend.backend import BackendConfig
@@ -333,11 +333,19 @@ def server_th_with_start_checks(
                 log(INFO, "Enabling GPU growth for Tensorflow on the server thread.")
                 enable_gpu_growth()
 
+            # Initialize Context
+            context = Context(
+                node_id=0,
+                node_config={},
+                state=RecordSet(),
+                run_config=_server_app_run_config,
+            )
+
             # Run ServerApp
-            run_server_app(
+            _run(
                 driver=_driver,
+                context=context,
                 server_app_dir=_server_app_dir,
-                server_app_run_config=_server_app_run_config,
                 server_app_attr=_server_app_attr,
                 loaded_server_app=_server_app,
             )