init

front/oscar/entry.py

@@ -0,0 +1,108 @@
+import asyncio
+import struct
+import settings
+
+from core.backend import Backend
+from typing import Optional, Callable
+from util.misc import Logger, ProtocolRunner
+
+from .ctrl import OSCARCtrl
+from .proto.snac import SNACMessage
+
+
+def register(loop: asyncio.AbstractEventLoop, backend: Backend) -> None:
+	backend.add_runner(ProtocolRunner('0.0.0.0', 5190, ListenerOSCAR, args=['OSCAR', backend, OSCARCtrl], service = 'OSCAR'))
+
+
+class ListenerOSCAR(asyncio.Protocol):
+	logger: Logger
+	backend: Backend
+	controller: OSCARCtrl
+	transport: Optional[asyncio.WriteTransport]
+
+	buffer: bytes = b''
+
+	def __init__(self,
+				 logger_prefix: str,
+				 backend: Backend,
+				 controller_factory: Callable[[Logger, str, Backend], OSCARCtrl]) -> None:
+		super().__init__()
+
+		self.logger = Logger(logger_prefix, self)
+		self.backend = backend
+		self.controller = controller_factory(self.logger, 'direct', backend)
+		self.controller.close_callback = self._on_close
+		self.transport = None
+
+	def connection_made(self, transport: asyncio.BaseTransport) -> None:
+		self.controller.transport = transport
+		self.controller.on_connect()
+		self.logger.log_connect()
+
+	def connection_lost(self, exc: Optional[Exception]) -> None:
+		self.controller.close()
+		self.logger.log_disconnect()
+
+	def data_received(self, packet: bytes) -> None:
+		if self.backend.maintenance_mode:
+			self.transport.close()
+			return
+
+		self.buffer += packet
+		self.parse_buffer()
+
+	def parse_buffer(self) -> None:
+		while True:
+			if self.controller.closed:
+				self.buffer = b''
+				break
+
+			if self.buffer[0] != 0x2A:
+				break
+
+			# TODO(subpurple): Bufferize this?
+			frame, sequence, length = struct.unpack('>BHH', self.buffer[1:6])
+
+			if len(self.buffer) < length + 6:
+				break
+
+			if len(self.buffer) >= length + 6:
+				data = self.buffer[6:length + 6]
+
+				match frame:
+					# SIGNON
+					case 0x01:
+						self.controller.on_signon_frame(data)
+
+					# DATA (always contains a SNAC)
+					case 0x02:
+						if len(data) < 10:
+							return
+
+						msg = SNACMessage()
+						msg.unmarshal(data)
+						self.controller.on_data_frame(msg)
+
+					# ERROR
+					case 0x03:
+						self.controller.on_error_frame(data)
+
+					# SIGNOFF
+					case 0x04:
+						self.controller.on_signoff_frame(data)
+
+					# KEEP_ALIVE
+					case 0x05:
+						pass
+
+					case _:
+						self.logger.info('Recieved unknown frame:', str(frame), 'with data:', data.hex())
+
+				self.buffer = self.buffer[length + 6:]
+
+			if len(self.buffer) < 6:
+				break
+
+	def _on_close(self) -> None:
+		if self.transport is not None:
+			self.transport.close()