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POPython script run via cron does not execute occassionally
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  1. POPython script run via cron does not execute occassionally
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    copied!<p>I have a simple python script for fetching tweets and caching them to disk that is configured to run every two minutes via cron.</p> <pre><code>*/2 * * * * (date ; /usr/bin/python /path/get_tweets.py) &gt;&gt; /path/log/get_tweets.log 2&gt;&amp;1 </code></pre> <p>The script runs successfully most of the time. However, every so often the script doesn't execute. In addition to other logging, I added a simple print statement above the meat of the script and nothing except the output from the initial date command makes it to the log. </p> <pre><code>#!/usr/bin/python # Script for Fetching Tweets and then storing them as an HTML snippet for inclusion using SSI print "Starting get_tweets.py" import simplejson as json import urllib2 import httplib import re import calendar import codecs import os import rfc822 from datetime import datetime import time import sys import pprint debug = True now = datetime.today() template = u'&lt;p class="tweet"&gt;%s &lt;span class="date"&gt;on %s&lt;/span&gt;&lt;/p&gt;' html_snippet = u'' timelineUrl = 'http://api.twitter.com/1/statuses/user_timeline.json?screen_name=gcorne&amp;count=7' tweetFilePath = '/path/server-generated-includes/tweets.html' if(debug): print "[%s] Fetching tweets from %s." % (now, timelineUrl) def getTweets(): request = urllib2.Request(timelineUrl) opener = urllib2.build_opener() try: tweets = opener.open(request) except: print "[%s] HTTP Request %s failed." % (now, timelineUrl) exitScript() tweets = tweets.read() return tweets def exitScript(): print "[%s] Script failed." % (now) sys.exit(0) tweets = getTweets() now = datetime.today() if(debug): print "[%s] Tweets retrieved." % (now) tweets = json.loads(tweets) for tweet in tweets: text = tweet['text'] + ' ' when = tweet['created_at'] when = re.match(r'(\w+\s){3}', when).group(0).rstrip() # print GetRelativeCreatedAt(when) # convert links text = re.sub(r'(http://.*?)\s', r'&lt;a href="\1"&gt;\1&lt;/a&gt;', text).rstrip() #convert hashtags text = re.sub(r'#(\w+)', r'&lt;a href="http://www.twitter.com/search/?q=%23\1"&gt;#\1&lt;/a&gt;', text) # convert @ replies text = re.sub(r'@(\w+)', r'@&lt;a href="http://www.twitter.com/\1"&gt;\1&lt;/a&gt;', text) html_snippet += template % (text, when) + "\n" #print html_snippet now = datetime.today() if(debug): print "[%s] Opening file %s." % (now, tweetFilePath) try: file = codecs.open(tweetFilePath, 'w', 'utf_8') except: print "[%s] File %s cound not be opened." % (now, tweetFilePath) exitScript() now = datetime.today() if(debug): print "[%s] Writing %s to disk." % (now, tweetFilePath) file.write(html_snippet) now = datetime.today() if(debug): print "[%s] Finished writing %s to disk." % (now, tweetFilePath) file.close() sys.exit(0) </code></pre> <p>Any ideas? The system is a VPS running Centos 5.3 with python 2.4. </p> <p><strong>Update:</strong> I have added the entire script to avoid any confusion.</p>
 

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