kill -1 will dump all the stacks for all coroutines

Signed-off-by: Jesse Jaggars <jjaggars@redhat.com>

Author: jhjaggars

receptor/__main__.py

@@ -1,5 +1,7 @@
+import asyncio
 import logging
 import logging.config
+import signal
 import sys
 
 from .config import ReceptorConfig
@@ -47,6 +49,12 @@ def _f(record):
     for h in logging.getLogger('receptor').handlers:
         h.addFilter(_f)
 
+    def dump_stacks(signum, frame):
+        for t in asyncio.Task.all_tasks():
+            t.print_stack(file=sys.stderr)
+
+    signal.signal(signal.SIGHUP, dump_stacks)
+
     try:
         config.go()
     except Exception: