Split IRC message if they are long.

IRC has a 512 byte maximum message size that includes the privmsg and
destination data. Use textwrap at 400 characters to approximate proper
splitting of long IRC messages to avoid exceptions that occur when
sending more than 512 bytes.

Change-Id: I575ce3694f4b399a3adf5432f6f6971307d9e202

elastic_recheck/bot.py

@@ -43,6 +43,7 @@ import daemon
 import logging
 import logging.config
 import os
+import textwrap
 import threading
 import time
 import yaml
@@ -94,8 +95,11 @@ class RecheckWatchBot(irc.bot.SingleServerIRCBot):
 
     def send(self, channel, msg):
         self.log.info('Sending "%s" to %s' % (msg, channel))
-        self.connection.privmsg(channel, msg)
-        time.sleep(0.5)
+        # Cheap way to attempt to send fewer than 512 bytes at a time.
+        # TODO(clarkb) calculate actual irc overhead and split properly.
+        for chunk in textwrap.wrap(msg, 400):
+            self.connection.privmsg(channel, chunk)
+            time.sleep(0.5)
 
 
 class RecheckWatch(threading.Thread):