experimental mail transport

core/helper.py

@@ -0,0 +1,30 @@
+import asyncio
+import logging
+import signal
+
+loop = None
+
+
+def create_task(coro):
+    global loop
+    loop.create_task(coro)
+
+
+async def shutdown(sig, loop):
+    log = logging.getLogger()
+    log.info(f"Received exit signal {sig.name}...")
+    tasks = [t for t in asyncio.all_tasks() if t is not
+             asyncio.current_task()]
+    [task.cancel() for task in tasks]
+    log.info(f"Cancelling {len(tasks)} outstanding tasks")
+    await asyncio.wait_for(loop.shutdown_asyncgens(), timeout=10)
+    loop.stop()
+    log.info("Shutdown complete.")
+
+
+def init_loop():
+    global loop
+    loop = asyncio.get_event_loop()
+    loop.add_signal_handler(signal.SIGTERM, lambda: asyncio.create_task(shutdown(signal.SIGTERM, loop)))
+    loop.add_signal_handler(signal.SIGINT, lambda: asyncio.create_task(shutdown(signal.SIGINT, loop)))
+    return loop