moonraker: Add "/server/restart" endpoint

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

moonraker/moonraker.py

@@ -13,7 +13,8 @@ import logging
 import json
 import confighelper
 import utils
-from tornado import iostream
+import asyncio
+from tornado import iostream, gen
 from tornado.ioloop import IOLoop
 from tornado.util import TimeoutError
 from tornado.locks import Event
@@ -69,6 +70,8 @@ class Server:
 
         self.register_endpoint(
             "/server/info", ['GET'], self._handle_info_request)
+        self.register_endpoint(
+            "/server/restart", ['POST'], self._handle_server_restart)
 
         # Setup remote methods accessable to Klippy.  Note that all
         # registered remote methods should be of the notification type,
@@ -155,6 +158,8 @@ class Server:
 
     # ***** Klippy Connection *****
     async def _connect_klippy(self):
+        if not self.server_running:
+            return
         ret = await self.klippy_connection.connect(self.klippy_address)
         if not ret:
             self.ioloop.call_later(.25, self._connect_klippy)
@@ -200,9 +205,12 @@ class Server:
         self.send_event("server:klippy_disconnect")
         if self.init_handle is not None:
             self.ioloop.remove_timeout(self.init_handle)
+        if self.server_running:
             self.ioloop.call_later(.25, self._connect_klippy)
 
     async def _initialize(self):
+        if not self.server_running:
+            return
         await self._check_ready()
         await self._request_endpoints()
         # Subscribe to "webhooks"
@@ -356,20 +364,22 @@ class Server:
         return result
 
     async def _stop_server(self):
-        # XXX - Currently this function is not used.
-        # Should I expose functionality to shutdown
-        # or restart the server, or simply remove this?
-        logging.info(
-            "Shutting Down Webserver")
-        for plugin in self.plugins:
-            if hasattr(plugin, "close"):
-                await plugin.close()
-        self.klippy_connection.close()
-        if self.server_running:
         self.server_running = False
+        for name, plugin in self.plugins.items():
+            if hasattr(plugin, "close"):
+                ret = plugin.close()
+                if asyncio.iscoroutine(ret):
+                    await ret
+        self.klippy_connection.close()
+        while self.klippy_state != "disconnected":
+            await gen.sleep(.1)
         await self.moonraker_app.close()
         self.ioloop.stop()
 
+    async def _handle_server_restart(self, path, method, args):
+        self.ioloop.spawn_callback(self._stop_server)
+        return "ok"
+
     async def _handle_info_request(self, path, method, args):
         return {
             'klippy_connected': self.klippy_connection.is_connected(),
@@ -494,20 +504,29 @@ def main():
 
     # Start IOLoop and Server
     io_loop = IOLoop.current()
+    estatus = 0
+    while True:
         try:
             server = Server(cmd_line_args)
         except Exception:
             logging.exception("Moonraker Error")
-        ql.stop()
-        exit(1)
+            estatus = 1
+            break
         try:
             server.start()
             io_loop.start()
         except Exception:
             logging.exception("Server Running Error")
+            estatus = 1
+            break
+        # 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...")
     io_loop.close(True)
     logging.info("Server Shutdown")
     ql.stop()
+    exit(estatus)
 
 
 if __name__ == '__main__':