better logs for idom.run + flask server

src/idom/log.py

@@ -25,7 +25,7 @@
     },
     "formatters": {
         "generic": {
-            "format": "%(asctime)s | %(levelname)s | %(name)s | %(message)s",
+            "format": "%(asctime)s | %(levelname)s | %(message)s",
             "datefmt": r"%Y-%m-%dT%H:%M:%S%z",
             "class": "logging.Formatter",
         }

src/idom/server/flask.py

@@ -23,6 +23,8 @@
 
 from .base import AbstractRenderServer
 
+logger = logging.getLogger(__name__)
+
 
 class Config(TypedDict, total=False):
     """Render server config for :class:`FlaskRenderServer`"""
@@ -163,7 +165,7 @@ def _generic_run_application(
     ) -> None:
         if debug:
             logging.basicConfig(level=logging.DEBUG)  # coverage: skip
-        logging.debug("Starting server...")
+        logger.info(f"Running at http://{host}:{port}")
         self._wsgi_server = _StartCallbackWSGIServer(
             self._server_did_start.set,
             (host, port),

src/idom/server/prefab.py

@@ -1,3 +1,4 @@
+import logging
 from typing import Any, Dict, Optional, Tuple, Type, TypeVar
 
 from idom.core.component import ComponentConstructor
@@ -6,12 +7,13 @@
 from .base import AbstractRenderServer
 from .utils import find_available_port, find_builtin_server_type
 
+logger = logging.getLogger(__name__)
 _S = TypeVar("_S", bound=AbstractRenderServer[Any, Any])
 
 
 def run(
     component: ComponentConstructor,
-    server_type: Optional[Type[_S]] = find_builtin_server_type("PerClientStateServer"),
+    server_type: Type[_S] = find_builtin_server_type("PerClientStateServer"),
     host: str = "127.0.0.1",
     port: Optional[int] = None,
     server_config: Optional[Any] = None,
@@ -44,11 +46,11 @@ def run(
         The server instance. This isn't really useful unless the server is spawned
         as a daemon. Otherwise this function blocks until the server has stopped.
     """
-    if server_type is None:  # coverage: skip
-        raise ValueError("No default server available.")
     if port is None:  # coverage: skip
         port = find_available_port(host)
 
+    logger.info(f"Using {server_type.__module__}.{server_type.__name__}")
+
     server = server_type(component, server_config)
 
     if app is not None:  # coverage: skip