support custom location for database persistent statefile (defaults to "capport.state" in cwd)

src/capport/comm/hub.py

@@ -299,11 +299,11 @@ class Hub:
         self._hostname = socket.getfqdn()
         self._app = app
         self._is_controller = is_controller
-        state_filename: typing.Optional[str]
+        state_filename: str
         if is_controller:
-            state_filename = 'capport.state'
+            state_filename = config.database_file
         else:
-            state_filename = None
+            state_filename = ''
         self.database = capport.database.Database(state_filename=state_filename)
         self._anon_context = ssl.SSLContext()
         # python ssl doesn't support setting tls1.3 ciphers yet, so make sure we stay on 1.2 for now to enable anon

src/capport/config.py

@@ -19,6 +19,7 @@ class Config:
     cookie_secret: str
     venue_info_url: typing.Optional[str]
     session_timeout: int  # in seconds
+    database_file: str  # empty str: disable database
     debug: bool
 
     @staticmethod
@@ -45,9 +46,10 @@ class Config:
         return Config(
             controllers=controllers,
             server_names=data.get('server-names', []),
-            comm_secret=str(data.get('comm-secret', None) or data['secret']),
+            comm_secret=str(data['comm-secret']),
             cookie_secret=str(data['cookie-secret']),
             venue_info_url=str(data.get('venue-info-url')),
             session_timeout=data.get('session-timeout', 3600),
+            database_file=str(data['database-file']) if 'database-file' in data else 'capport.state',
             debug=data.get('debug', False)
         )

src/capport/database.py

@@ -139,7 +139,7 @@ class NotReadyYet(Exception):
 
 
 class Database:
-    def __init__(self, state_filename: typing.Optional[str] = None):
+    def __init__(self, state_filename: str = None):
         self._macs: dict[cptypes.MacAddress, MacEntry] = {}
         self._state_filename = state_filename
         self._changed_since_last_cleanup = False