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## web hook dispatcher library
#
# Copyright (c) 2008, 2009 Adam Marshall Smith
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
#
# Idea:
# - recipients are urls
# - events are special strings starting with reversed domain
# - args are arbitrary dicts to post to each recipient of an event
# - cooldown time is the wait after a failed post before trying again
# - retry time is to total time during which retries will continue
from twisted.internet import defer, reactor
from twisted.web import client
import time
import urllib
class HookManager(object):
"""I manage a list of active recipients to which I will do my best to deliver payloads."""
cooldownTime = 60 # between successive hooks
retryTime = 3600 # stop retrying after this time
def __init__(self):
self.recipients = []
def addRecipient(self, recipient):
self.recipients.append(recipient)
def dispatchEvent(self, event, args={}, **kw):
entry = {"event": event}
entry.update(kw)
entry.update(args)
now = time.time()
for r in self.recipients:
self.__dispatchEventToRecipient(entry, r, now)
def __dispatchEventToRecipient(self, entry, recipient, ctime):
def _good(page):
# looks like it worked
pass
def _bad(reason):
reactor.callLater(
self.cooldownTime,
self.__dispatchEventToRecipient,
entry,
recipient,
ctime)
now = time.time()
if now < ctime + self.retryTime:
data = urllib.urlencode(entry)
headers = {
'content-type': 'application/x-www-form-urlencoded',
'content-length': str(len(data)),
}
client.getPage(recipient, method='POST', postdata=data, headers=headers) \
.addCallbacks(_good,_bad)
else:
# silently drop this guy because it is past his retry time
pass