moonraker: use native asyncio unix streams

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

moonraker/moonraker.py

@@ -20,7 +20,6 @@ import signal
 import confighelper
 import utils
 import asyncio
-from tornado import iostream
 from tornado.httpclient import AsyncHTTPClient
 from eventloop import EventLoop
 from app import MoonrakerApp
@@ -50,6 +49,7 @@ if TYPE_CHECKING:
 INIT_TIME = .25
 LOG_ATTEMPT_INTERVAL = int(2. / INIT_TIME + .5)
 MAX_LOG_ATTEMPTS = 10 * LOG_ATTEMPT_INTERVAL
+UNIX_BUFFER_LIMIT = 2 * 1024 * 1024
 
 CORE_COMPONENTS = [
     'database', 'file_manager', 'klippy_apis', 'machine',
@@ -637,7 +637,7 @@ class Server:
         try:
             if self.klippy_connection.is_connected():
                 self.klippy_disconnect_evt = asyncio.Event()
-                self.klippy_connection.close()
+                await self.klippy_connection.close()
                 await asyncio.wait_for(
                     self.klippy_disconnect_evt.wait(), 2.)
                 self.klippy_disconnect_evt = None
@@ -696,7 +696,9 @@ class KlippyConnection:
                  on_close: Callable[[], None],
                  event_loop: EventLoop
                  ) -> None:
-        self.iostream: Optional[iostream.IOStream] = None
+        self.writer: Optional[asyncio.StreamWriter] = None
+        self.closed: bool = True
+        self.close_mutex: asyncio.Lock = asyncio.Lock()
         self.on_recd = on_recd
         self.on_close = on_close
         self.event_loop = event_loop
@@ -714,24 +716,23 @@ class KlippyConnection:
                 self.log_no_access = False
             return False
         self.log_no_access = True
-        ksock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-        kstream = iostream.IOStream(ksock)
         try:
-            await kstream.connect(address)
+            reader, writer = await asyncio.open_unix_connection(
-        except iostream.StreamClosedError:
+                address, limit=UNIX_BUFFER_LIMIT)
+        except Exception:
             return False
         logging.info("Klippy Connection Established")
-        self.iostream = kstream
+        self.closed = False
-        self.iostream.set_close_callback(self.on_close)
+        self.writer = writer
-        self.event_loop.register_callback(self._read_stream, self.iostream)
+        self.event_loop.register_callback(self._read_stream, reader)
         return True
 
-    async def _read_stream(self, stream: iostream.IOStream) -> None:
+    async def _read_stream(self, reader: asyncio.StreamReader) -> None:
-        while not stream.closed():
+        while not reader.at_eof():
             try:
-                data = await stream.read_until(b'\x03')
+                data = await reader.readuntil(b'\x03')
-            except iostream.StreamClosedError as e:
+            except asyncio.IncompleteReadError:
-                return
+                break
             except Exception:
                 logging.exception("Klippy Stream Read Error")
                 continue
@@ -741,24 +742,33 @@ class KlippyConnection:
             except Exception:
                 logging.exception(
                     f"Error processing Klippy Host Response: {data.decode()}")
+        await self.close()
 
     async def send_request(self, request: BaseRequest) -> None:
-        if self.iostream is None:
+        if self.writer is None:
             request.notify(ServerError("Klippy Host not connected", 503))
             return
         data = json.dumps(request.to_dict()).encode() + b"\x03"
         try:
-            await self.iostream.write(data)
+            self.writer.write(data)
-        except iostream.StreamClosedError:
+            await self.writer.drain()
+        except Exception:
             request.notify(ServerError("Klippy Host not connected", 503))
+            await self.close()
 
     def is_connected(self) -> bool:
-        return self.iostream is not None and not self.iostream.closed()
+        return not self.closed
 
-    def close(self) -> None:
+    async def close(self) -> None:
-        if self.iostream is not None and \
+        async with self.close_mutex:
-                not self.iostream.closed():
+            if self.writer is not None:
-            self.iostream.close()
+                self.writer.close()
+                await self.writer.wait_closed()
+                self.writer = None
+            if not self.closed:
+                self.closed = True
+                self.on_close()
+            self.closing = False
 
 # Basic WebRequest class, easily converted to dict for json encoding
 class BaseRequest: