Add disable_signal_handlers option to rpki.async.sync_wrapper and

rpki.irdb.Zookeeper() to avoid problems when running in environments
like mod_wsgi which have strong opinions about what code is and is not
allowed to handle signals.  This may result in some noise in log
files, but there's not much we can do about that if we're not allowed
to clean up when terminated, so be it.  See #681.

svn path=/trunk/; revision=6027

1 files changed, 6 insertions, 2 deletions

diff --git a/rpki/async.py b/rpki/async.py
index b17c31ed..75b4b656 100644
--- a/rpki/async.py
+++ b/rpki/async.py
@@ -339,8 +339,9 @@ class sync_wrapper(object):
   err = None
   fin = False
 
-  def __init__(self, func):
+  def __init__(self, func, disable_signal_handlers = False):
     self.func = func
+    self.disable_signal_handlers = disable_signal_handlers
 
   def cb(self, res = None):
     """
@@ -374,7 +375,10 @@ class sync_wrapper(object):
         self.eb(e)
 
     event_defer(thunk)
-    event_loop()
+    if self.disable_signal_handlers:
+      event_loop(catch_signals = ())
+    else:
+      event_loop()
     if not self.fin:
       logger.warning("%r event_loop terminated without callback or errback", self)
     if self.err is None: