server: refactor startup

Use asyncio.run() to launch the server application as recommended
by the Python docs.

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/confighelper.py

@@ -1108,7 +1108,10 @@ class FileSourceWrapper(ConfigSourceWrapper):
 def get_configuration(
     server: Server, app_args: Dict[str, Any]
 ) -> ConfigHelper:
-    start_path = pathlib.Path(app_args['config_file']).expanduser().resolve()
+    cfg_file = app_args["config_file"]
+    if app_args["is_backup_config"]:
+        cfg_file = app_args["backup_config"]
+    start_path = pathlib.Path(cfg_file).expanduser().absolute()
     source = FileSourceWrapper(server)
     source.read_file(start_path)
     if not source.config.has_section('server'):

moonraker/eventloop.py

@@ -27,7 +27,7 @@ _uvl_var = os.getenv("MOONRAKER_ENABLE_UVLOOP", "y").lower()
 _uvl_enabled = False
 if _uvl_var in ["y", "yes", "true"]:
     with contextlib.suppress(ImportError):
-        import uvloop
+        import uvloop  # type: ignore
         asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
         _uvl_enabled = True
 
@@ -48,7 +48,7 @@ class EventLoop:
         return self.aioloop
 
     def reset(self) -> None:
-        self.aioloop = self._create_new_loop()
+        self.aioloop = asyncio.get_running_loop()
         self.add_signal_handler = self.aioloop.add_signal_handler
         self.remove_signal_handler = self.aioloop.remove_signal_handler
         self.add_reader = self.aioloop.add_reader
@@ -126,7 +126,7 @@ class EventLoop:
             host, port, family=0, type=socket.SOCK_STREAM
         )
         for res in ainfo:
-            af, socktype, proto, canonname, sa = res
+            af, socktype, proto, _cannon_name, _sa = res
             sock = None
             try:
                 sock = socket.socket(af, socktype, proto)
@@ -152,12 +152,6 @@ class EventLoop:
         else:
             raise socket.error("getaddrinfo returns an empty list")
 
-    def start(self):
-        self.aioloop.run_forever()
-
-    def stop(self):
-        self.aioloop.stop()
-
     def close(self):
         self.aioloop.close()
 

moonraker/loghelper.py

@@ -130,6 +130,7 @@ class LogManager:
         return eventloop.run_in_thread(self.file_hdlr.doRollover)
 
     def stop_logging(self):
+        if self.listener is not None:
             self.listener.stop()
 
     async def _handle_log_rollover(

moonraker/server.py

@@ -89,6 +89,7 @@ class Server:
         self.ssl_port: int = config.getint('ssl_port', 7130)
         self.exit_reason: str = ""
         self.server_running: bool = False
+        self.app_running_evt = asyncio.Event()
         self.pip_recovery_attempted: bool = False
 
         # Configure Debug Logging
@@ -198,10 +199,8 @@ class Server:
             await self.event_loop.run_in_thread(self.config.create_backup)
 
         machine: Machine = self.lookup_component("machine")
-        if await machine.validate_installation():
+        restarting = await machine.validate_installation()
-            return
+        if not restarting and start_server:
-
-        if start_server:
             await self.start_server()
 
     async def start_server(self, connect_to_klippy: bool = True) -> None:
@@ -218,6 +217,9 @@ class Server:
         if connect_to_klippy:
             self.klippy_connection.connect()
 
+    async def run_until_exit(self) -> None:
+        await self.app_running_evt.wait()
+
     def add_log_rollover_item(
         self, name: str, item: str, log: bool = True
     ) -> None:
@@ -488,7 +490,7 @@ class Server:
 
         self.exit_reason = exit_reason
         self.event_loop.remove_signal_handler(signal.SIGTERM)
-        self.event_loop.stop()
+        self.app_running_evt.set()
 
     async def _handle_server_restart(self, web_request: WebRequest) -> str:
         self.event_loop.register_callback(self._stop_server)
@@ -540,6 +542,45 @@ class Server:
             'files': cfg_file_list
         }
 
+async def launch_server(
+    log_manager: LogManager, app_args: Dict[str, Any]
+) -> Optional[int]:
+    eventloop = EventLoop()
+    startup_warnings: List[str] = app_args["startup_warnings"]
+    try:
+        server = Server(app_args, log_manager, eventloop)
+        server.load_components()
+    except confighelper.ConfigError as e:
+        logging.exception("Server Config Error")
+        backup_cfg: Optional[str] = app_args["backup_config"]
+        if app_args["is_backup_config"] or backup_cfg is None:
+            return 1
+        app_args["is_backup_config"] = True
+        startup_warnings.append(
+            f"Server configuration error: {e}\n"
+            f"Loading most recent working configuration: '{backup_cfg}'\n"
+            f"Please fix the issue in moonraker.conf and restart the server."
+        )
+        return True
+    except Exception:
+        logging.exception("Moonraker Error")
+        return 1
+    try:
+        await server.server_init()
+        await server.run_until_exit()
+    except Exception:
+        logging.exception("Server Running Error")
+        return 1
+    if server.exit_reason == "terminate":
+        return 0
+    # Restore the original config and clear the warning
+    # before the server restarts
+    if app_args["is_backup_config"]:
+        startup_warnings.pop()
+        app_args["is_backup_config"] = False
+    del server
+    return None
+
 def main(from_package: bool = True) -> None:
     def get_env_bool(key: str) -> bool:
         return os.getenv(key, "").lower() in ["y", "yes", "true"]
@@ -635,6 +676,7 @@ def main(from_package: bool = True) -> None:
         "data_path": str(data_path),
         "is_default_data_path": cmd_line_args.datapath is None,
         "config_file": cfg_file,
+        "backup_config": confighelper.find_config_backup(cfg_file),
         "startup_warnings": startup_warnings,
         "verbose": cmd_line_args.verbose,
         "debug": cmd_line_args.debug,
@@ -661,60 +703,14 @@ def main(from_package: bool = True) -> None:
     log_manager = LogManager(app_args, startup_warnings)
 
     # Start asyncio event loop and server
-    event_loop = EventLoop()
-    alt_config_loaded = False
-    estatus = 0
     while True:
-        try:
+        estatus = asyncio.run(launch_server(log_manager, app_args))
-            server = Server(app_args, log_manager, event_loop)
+        if estatus is not None:
-            server.load_components()
-        except confighelper.ConfigError as e:
-            backup_cfg = confighelper.find_config_backup(cfg_file)
-            logging.exception("Server Config Error")
-            if alt_config_loaded or backup_cfg is None:
-                estatus = 1
             break
-            app_args["config_file"] = backup_cfg
-            app_args["is_backup_config"] = True
-            warn_list = list(startup_warnings)
-            app_args["startup_warnings"] = warn_list
-            warn_list.append(
-                f"Server configuration error: {e}\n"
-                f"Loaded server from most recent working configuration:"
-                f" '{app_args['config_file']}'\n"
-                f"Please fix the issue in moonraker.conf and restart "
-                f"the server."
-            )
-            alt_config_loaded = True
-            continue
-        except Exception:
-            logging.exception("Moonraker Error")
-            estatus = 1
-            break
-        try:
-            event_loop.register_callback(server.server_init)
-            event_loop.start()
-        except Exception:
-            logging.exception("Server Running Error")
-            estatus = 1
-            break
-        if server.exit_reason == "terminate":
-            break
-        # Restore the original config and clear the warning
-        # before the server restarts
-        if alt_config_loaded:
-            app_args["config_file"] = cfg_file
-            app_args["startup_warnings"] = startup_warnings
-            app_args["is_backup_config"] = False
-            alt_config_loaded = False
-        event_loop.close()
         # Since we are running outside of the the server
         # it is ok to use a blocking sleep here
         time.sleep(.5)
         logging.info("Attempting Server Restart...")
-        del server
-        event_loop.reset()
-    event_loop.close()
     logging.info("Server Shutdown")
     log_manager.stop_logging()
     exit(estatus)