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authorLance Stout <lance@dingus.local>2011-05-27 14:42:40 -0700
committerLance Stout <lance@dingus.local>2011-05-27 14:42:40 -0700
commitb81ab979006956134e5d924640936fe8cc20dbf3 (patch)
treeb6b9f90923c4ab040a6d9b6d11d6084c23300cb2 /sleekxmpp
parent384e1a92b716250c168f5dedc1f9693111f81423 (diff)
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Add exponential backoff to connection attempts.
Delay will approximately double between attempts (random variation). See issue #67.
Diffstat (limited to 'sleekxmpp')
-rw-r--r--sleekxmpp/xmlstream/xmlstream.py16
1 files changed, 15 insertions, 1 deletions
diff --git a/sleekxmpp/xmlstream/xmlstream.py b/sleekxmpp/xmlstream/xmlstream.py
index 468db032..6bf70fbf 100644
--- a/sleekxmpp/xmlstream/xmlstream.py
+++ b/sleekxmpp/xmlstream/xmlstream.py
@@ -17,6 +17,7 @@ import sys
import threading
import time
import types
+import random
try:
import queue
except ImportError:
@@ -45,6 +46,9 @@ HANDLER_THREADS = 1
# Flag indicating if the SSL library is available for use.
SSL_SUPPORT = True
+# Maximum time to delay between connection attempts is one hour.
+RECONNECT_MAX_DELAY = 3600
+
log = logging.getLogger(__name__)
@@ -104,7 +108,11 @@ class XMLStream(object):
use_ssl -- Flag indicating if SSL should be used.
use_tls -- Flag indicating if TLS should be used.
stop -- threading Event used to stop all threads.
- auto_reconnect-- Flag to determine whether we auto reconnect.
+
+ auto_reconnect -- Flag to determine whether we auto reconnect.
+ reconnect_max_delay -- Maximum time to delay between connection
+ attempts. Defaults to RECONNECT_MAX_DELAY,
+ which is one hour.
Methods:
add_event_handler -- Add a handler for a custom event.
@@ -155,6 +163,7 @@ class XMLStream(object):
self.ca_certs = None
self.response_timeout = RESPONSE_TIMEOUT
+ self.reconnect_max_delay = RECONNECT_MAX_DELAY
self.state = StateMachine(('disconnected', 'connected'))
self.state._set_state('disconnected')
@@ -291,9 +300,14 @@ class XMLStream(object):
# is established.
connected = self.state.transition('disconnected', 'connected',
func=self._connect)
+ delay = 1.0
while reattempt and not connected:
connected = self.state.transition('disconnected', 'connected',
func=self._connect)
+ delay = min(delay * 2, self.reconnect_max_delay)
+ delay = random.normalvariate(delay, delay * 0.1)
+ log.debug('Waiting %s seconds before reconnecting.' % delay)
+ time.sleep(delay)
return connected
def _connect(self):