Make default path a constant

Author: agners

matter_server/server/const.py

@@ -1,5 +1,6 @@
 """Server-only constants for the Python Matter Server."""
-
+import pathlib
+from typing import Final
 
 # The minimum schema version (of a client) the server can support
 MIN_SCHEMA_VERSION = 5
@@ -8,3 +9,13 @@
 # only bump if the format of the data in MatterNodeData changed
 # and a full re-interview is mandatory
 DATA_MODEL_SCHEMA_VERSION = 6
+
+# Keep default location inherited from early version of the Python
+# bindings.
+DEFAULT_PAA_ROOT_CERTS_DIR: Final[pathlib.Path] = (
+    pathlib.Path(__file__)
+    .parent.resolve()
+    .parent.resolve()
+    .parent.resolve()
+    .joinpath("credentials/development/paa-root-certs")
+)

matter_server/server/server.py

@@ -7,7 +7,6 @@
 import ipaddress
 import logging
 import os
-import pathlib
 from pathlib import Path
 import traceback
 from typing import TYPE_CHECKING, Any, Callable, Set, cast
@@ -30,7 +29,7 @@
     ServerInfoMessage,
 )
 from ..server.client_handler import WebsocketClientHandler
-from .const import MIN_SCHEMA_VERSION
+from .const import DEFAULT_PAA_ROOT_CERTS_DIR, MIN_SCHEMA_VERSION
 from .device_controller import MatterDeviceController
 from .stack import MatterStack
 from .storage import StorageController
@@ -111,13 +110,7 @@ def __init__(
         self.listen_addresses = listen_addresses
         self.primary_interface = primary_interface
         if paa_root_cert_dir is None:
-            self.paa_root_cert_dir = (
-                pathlib.Path(__file__)
-                .parent.resolve()
-                .parent.resolve()
-                .parent.resolve()
-                .joinpath("credentials/development/paa-root-certs")
-            )
+            self.paa_root_cert_dir = DEFAULT_PAA_ROOT_CERTS_DIR
         else:
             self.paa_root_cert_dir = Path(paa_root_cert_dir).absolute()
         self.logger = logging.getLogger(__name__)