refactor(framework) Make argparse processing the first action of `Sup…

…erNode` and `SuperLink` (#4332)

src/py/flwr/client/supernode/app.py

@@ -48,14 +48,13 @@
 
 def run_supernode() -> None:
     """Run Flower SuperNode."""
+    args = _parse_args_run_supernode().parse_args()
+    _warn_deprecated_server_arg(args)
+
     log(INFO, "Starting Flower SuperNode")
 
     event(EventType.RUN_SUPERNODE_ENTER)
 
-    args = _parse_args_run_supernode().parse_args()
-
-    _warn_deprecated_server_arg(args)
-
     # Check if both `--flwr-dir` and `--isolation` were set
     if args.flwr_dir is not None and args.isolation is not None:
         log(
@@ -186,12 +185,12 @@ def _parse_args_run_supernode() -> argparse.ArgumentParser:
         "--flwr-dir",
         default=None,
         help="""The path containing installed Flower Apps.
-    By default, this value is equal to:
+        The default directory is:
 
         - `$FLWR_HOME/` if `$FLWR_HOME` is defined
         - `$XDG_DATA_HOME/.flwr/` if `$XDG_DATA_HOME` is defined
         - `$HOME/.flwr/` in all other cases
-    """,
+        """,
     )
     parser.add_argument(
         "--isolation",

src/py/flwr/server/app.py

@@ -199,12 +199,12 @@ def start_server(  # pylint: disable=too-many-arguments,too-many-locals
 # pylint: disable=too-many-branches, too-many-locals, too-many-statements
 def run_superlink() -> None:
     """Run Flower SuperLink (Driver API and Fleet API)."""
+    args = _parse_args_run_superlink().parse_args()
+
     log(INFO, "Starting Flower SuperLink")
 
     event(EventType.RUN_SUPERLINK_ENTER)
 
-    args = _parse_args_run_superlink().parse_args()
-
     # Parse IP address
     driver_address, _, _ = _format_address(args.driver_api_address)