Add twitter support to statusbot

Similar to replicating to github for the convenience of our
developer community, sending statuses ALSO to twitter seems
like a potentially low-impact way to communicate status on
an additional channel.

Change-Id: Ib4bdbb335e4bc12d75d5f0ec2a1b95c8a6b2e7d5

requirements.txt

@@ -2,3 +2,4 @@ simplemediawiki
 irc
 python-daemon
 kitchen
+python-twitter

statusbot/bot.py

@@ -30,6 +30,12 @@ user=StatusBot
 password=password
 url=https://wiki.example.com/w/api.php
 pageid=1781
+
+[twitter]
+consumer_key=consumer_key
+consumer_secret=consumer_secret
+access_token_key='access_token
+access_token_secret='access_token_secret
 """
 
 import argparse
@@ -45,6 +51,7 @@ import simplemediawiki
 import datetime
 import re
 import ssl
+import twitter
 
 try:
     import daemon.pidlockfile
@@ -77,6 +84,37 @@ class UpdateInterface(object):
         pass
 
 
+class Tweet(UpdateInterface):
+
+    def __init__(self, config):
+        self.consumer_key = config.get('twitter', 'consumer_key')
+        self.consumer_secret = config.get('twitter', 'consumer_secret')
+        self.access_token_key = config.get('twitter', 'access_token_key')
+        self.access_token_secret = config.get('twitter', 'access_token_secret')
+        self.api = twitter.Api(
+            consumer_key=self.consumer_key,
+            consumer_secret=self.consumer_secret,
+            access_token_key=self.access_token,
+            access_token_secret=self.access_token_secret)
+
+    def update(self, msg):
+        # Limit tweets to 120 characters to facilitate retweets
+        for tweet in xrange(0, len(msg), 120):
+            self.api.PostUpdate(msg[tweet:tweet + 120])
+
+    def alert(self, msg=None):
+        self.update(msg)
+
+    def notice(self, msg=None):
+        self.update(msg)
+
+    def log(self, msg=None):
+        pass
+
+    def ok(self, msg=None):
+        self.update("Everything back to normal")
+
+
 class StatusPage(UpdateInterface):
     alert_re = re.compile(r'{{CI Alert\|(.*?)}}')
     item_re = re.compile(r'^\* (.*)$')
@@ -346,6 +384,8 @@ def _main(configpath):
              config.get('ircbot', 'nicks').split(',')]
     publishers = [StatusPage(config),
                   AlertFile(config)]
+    if config.has_section('twitter'):
+        publishers.append(Tweet(config))
 
     bot = StatusBot(channels, nicks, publishers,
                     config.get('ircbot', 'nick'),