Adjust the whole framework to event handler dependency inversion

lib/tfw/main/__init__.py

@@ -0,0 +1,3 @@
+from .tfw_connector import TFWUplinkConnector, TFWConnector
+from .event_handler_factory import EventHandlerFactory
+from .signal_handling import setup_signal_handlers

lib/tfw/main/event_handler_factory.py

@@ -0,0 +1,8 @@
+from tfw.event_handlers import EventHandlerFactoryBase
+
+from .tfw_connector import TFWConnector
+
+
+class EventHandlerFactory(EventHandlerFactoryBase):
+    def _build_server_connector(self):
+        return TFWConnector()

lib/tfw/main/signal_handling.py

@@ -0,0 +1,11 @@
+from signal import signal, SIGTERM, SIGINT
+
+from tfw.event_handlers import EventHandler
+
+
+def setup_signal_handlers():
+    def stop(*_):
+        EventHandler.stop_all_instances()
+        exit(0)
+    signal(SIGTERM, stop)
+    signal(SIGINT, stop)

lib/tfw/main/tfw_connector.py

@@ -0,0 +1,25 @@
+from tfw.networking import ServerConnector, ServerUplinkConnector
+from tfw.config import TFWENV
+
+
+class ConnAddrMixin:
+    @property
+    def uplink_conn_addr(self):
+        return f'tcp://localhost:{TFWENV.PULL_PORT}'
+
+    @property
+    def downlink_conn_addr(self):
+        return f'tcp://localhost:{TFWENV.PUB_PORT}'
+
+
+class TFWUplinkConnector(ServerUplinkConnector, ConnAddrMixin):
+    def __init__(self):
+        super().__init__(self.uplink_conn_addr)
+
+
+class TFWConnector(ServerConnector, ConnAddrMixin):
+    def __init__(self):
+        super().__init__(
+            self.downlink_conn_addr,
+            self.uplink_conn_addr
+        )