feat: configurable API rate limit

app/params.py

@@ -17,6 +17,7 @@ class Parameters:
     timeout: int = 120
     db_uri: str = "sqlite://db.sqlite"
     cache_uri: str = "memory://"
+    api_rate_limit: str = "100/minute"
 
     @classmethod
     def from_namespace(cls, args: argparse.Namespace) -> Parameters:
@@ -128,5 +129,12 @@ def parse_parameters(args: typing.Sequence[str]) -> Parameters:
         default=default_values.cache_uri,
         help_txt="cache connection URI",
     )
+    __add_arg_str(
+        parser,
+        "--api-rate-limit",
+        env_var="API_RATE_LIMIT",
+        default=default_values.api_rate_limit,
+        help_txt="API rate limit (flask-limiter syntax)",
+    )
     parsed_args = parser.parse_args(args)
     return Parameters.from_namespace(parsed_args)

app/server.py

@@ -27,7 +27,7 @@ class Server(gunicorn.app.base.BaseApplication):
         self.limiter = flask_limiter.Limiter(
             flask_limiter.util.get_remote_address,
             app=self.app,
-            default_limits=["100 per minute"],
+            default_limits=[params.api_rate_limit],
             storage_uri=params.cache_uri,
         )
         self._index_content: str | None = None