delayed login alerts to prevent spam with mass logins

service.py

@@ -2,11 +2,14 @@
 import asyncio
 import datetime
 import logging
+import os
+import shutil
 import signal
 
-from alerting import alerts
+from alerting import alerts, delayed
 from misc import checks, cvars
 from misc.checkers import interval_checker, scheduled_checker
+from misc.common import TMP_DIR
 from misc.config import get_config
 
 logging.basicConfig(level=logging.INFO)
@@ -19,9 +22,28 @@ def stop_gracefully(signum, frame):
     stopping = True
 
 
+def create_temp_dir() -> None:
+    try:
+        os.mkdir(str(TMP_DIR))
+    except FileExistsError:
+        pass
+    os.chmod(str(TMP_DIR), 0o770)
+    try:
+        shutil.chown(str(TMP_DIR), user="root", group="alerting")
+    except LookupError:
+        shutil.chown(str(TMP_DIR), user="root", group="root")
+    with open(str(TMP_DIR / "pid"), "w") as pf:
+        pf.write(str(os.getpid()))
+
+
 async def main():
+    create_temp_dir()
+
     signal.signal(signal.SIGTERM, stop_gracefully)
 
+    loop = asyncio.get_event_loop()
+    loop.add_signal_handler(signal.SIGUSR1, lambda: asyncio.create_task(delayed.handler()))
+
     cvars.config.set(get_config())
 
     client = await alerts.get_client()
@@ -46,6 +68,7 @@ async def main():
         while True:
             if stopping:
                 await client.close()
+                shutil.rmtree(str(TMP_DIR))
                 raise SystemExit
             else:
                 await asyncio.sleep(3)