1 files changed, 34 insertions, 0 deletions
diff --git a/rpkid/rpki/async.py b/rpkid/rpki/async.py
new file mode 100644
index 00000000..4dc56d41
--- /dev/null
+++ b/rpkid/rpki/async.py
@@ -0,0 +1,34 @@
+"""
+Utilities for event-driven programming.
+
+$Id$
+
+Copyright (C) 2009  Internet Systems Consortium ("ISC")
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+"""
+
+class iterator(object):
+  """Iteration construct for event-driven code."""
+
+  def __init__(self, iterable, handler_cb, done_cb):
+    self.handler_cb = handler_cb
+    self.done_cb = done_cb
+    self.iterator = iter(iterable)
+
+  def __call__(self, *ignored):
+    try:
+      self.handler_cb(self.iterator.next())
+    except StopIteration:
+      if self.done_cb is not None:
+        self.done_cb()