refactor(framework:skip) Set isolation modes as codebase constants (#…

…4353)

src/py/flwr/client/app.py

@@ -37,6 +37,8 @@
 from flwr.common.address import parse_address
 from flwr.common.constant import (
     CLIENTAPPIO_API_DEFAULT_ADDRESS,
+    ISOLATION_MODE_PROCESS,
+    ISOLATION_MODE_SUBPROCESS,
     MISSING_EXTRA_REST,
     RUN_ID_NUM_BYTES,
     TRANSPORT_TYPE_GRPC_ADAPTER,
@@ -62,9 +64,6 @@
 from .numpy_client import NumPyClient
 from .run_info_store import DeprecatedRunInfoStore
 
-ISOLATION_MODE_SUBPROCESS = "subprocess"
-ISOLATION_MODE_PROCESS = "process"
-
 
 def _check_actionable_client(
     client: Optional[Client], client_fn: Optional[ClientFnExt]

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

@@ -31,18 +31,16 @@
 from flwr.common.config import parse_config_args
 from flwr.common.constant import (
     FLEET_API_GRPC_RERE_DEFAULT_ADDRESS,
+    ISOLATION_MODE_PROCESS,
+    ISOLATION_MODE_SUBPROCESS,
     TRANSPORT_TYPE_GRPC_ADAPTER,
     TRANSPORT_TYPE_GRPC_RERE,
     TRANSPORT_TYPE_REST,
 )
 from flwr.common.exit_handlers import register_exit_handlers
 from flwr.common.logger import log, warn_deprecated_feature
 
-from ..app import (
-    ISOLATION_MODE_PROCESS,
-    ISOLATION_MODE_SUBPROCESS,
-    start_client_internal,
-)
+from ..app import start_client_internal
 from ..clientapp.utils import get_load_client_app_fn
 
 
@@ -200,10 +198,10 @@ def _parse_args_run_supernode() -> argparse.ArgumentParser:
             ISOLATION_MODE_SUBPROCESS,
             ISOLATION_MODE_PROCESS,
         ],
-        help="Isolation mode when running `ClientApp` (optional, possible values: "
-        "`subprocess`, `process`). By default, `ClientApp` runs in the same process "
+        help="Isolation mode when running a `ClientApp` (optional, possible values: "
+        "`subprocess`, `process`). By default, a `ClientApp` runs in the same process "
         "that executes the SuperNode. Use `subprocess` to configure SuperNode to run "
-        "`ClientApp` in a subprocess. Use `process` to indicate that a separate "
+        "a `ClientApp` in a subprocess. Use `process` to indicate that a separate "
         "independent process gets created outside of SuperNode.",
     )
     parser.add_argument(

src/py/flwr/common/constant.py

@@ -83,6 +83,10 @@
 # Message TTL
 MESSAGE_TTL_TOLERANCE = 1e-1
 
+# Isolation modes
+ISOLATION_MODE_SUBPROCESS = "subprocess"
+ISOLATION_MODE_PROCESS = "process"
+
 
 class MessageType:
     """Message type."""