gtools: Make eventd tolerate unhandled exceptions

Make 'snf-ganeti-eventd' daemon tolerate exceptions while processing
events, in order to avoid losing many Ganeti events because of a failure
to process a message of specific type.

Changelog

@@ -157,6 +157,9 @@ Cyclades
 * Store basic information about images that have been used to create servers,
 	in order to preserve this information even if images are deleted from
 	Pithos.
+* Make 'snf-ganeti-eventd' tolerate failures when processing Ganeti jobs. The
+  daemon will not crash but continue to run in order to process jobs that can
+  be processed.
 * Update 'backend-list' command to not count the free IPs from networks that
   are drained.
 * Fix the'network-inspect' command to not contain externally reserved IPs

snf-cyclades-gtools/synnefo/ganeti/eventd.py

@@ -530,7 +530,10 @@ def main():
 
         while True:    # loop forever
             # process the queue of events as explained above
-            notifier.process_events()
+            try:
+                notifier.process_events()
+            except StandardError:
+                logger.exception("Unhandled exception")
             if notifier.check_events():
                 # read notified events and enqeue them
                 notifier.read_events()