Make event_handler_main shutdown gracefully on SIGTERM and SIGINT

solvable/src/event_handler_main.py

@@ -1,9 +1,10 @@
 from ast import literal_eval
 from functools import partial
+from signal import signal, SIGTERM, SIGINT
 
 from tornado.ioloop import IOLoop
 
-from tfw import YamlFSM, FSMAwareEventHandler
+from tfw import YamlFSM, FSMAwareEventHandler, EventHandlerBase
 from tfw.components import IdeEventHandler, TerminalEventHandler
 from tfw.components import ProcessManagingEventHandler, BashMonitor
 from tfw.components import TerminalCommands, LogMonitoringEventHandler
@@ -136,9 +137,12 @@ if __name__ == '__main__':
     # Example terminal command callback
     terminal.historymonitor.subscribe_callback(cenator)
 
-    try:
-        IOLoop.instance().start()
-    finally:
-        eventhandlers = {fsm, ide, terminal, processmanager, logmonitor, message_fsm_steps}
-        for eh in eventhandlers:
+    event_handlers = EventHandlerBase.get_local_instances()
+    def cleanup(sig, frame):
+        for eh in event_handlers:
             eh.cleanup()
+        exit(0)
+    signal(SIGTERM, cleanup)
+    signal(SIGINT, cleanup)
+
+    IOLoop.instance().start()