#metal metalinjection rss script

sometal.py

#!/usr/bin/env python
#

import re
import sys
import pickle
import pprint
import feedparser

from slackclient import SlackClient

reviews_file = "./sometal.pickle"
token = 'xoxb-xxxxxxxxxx-xxxxxxxxxxxxxxxxxx'
feed_url = 'http://feeds.feedburner.com/metalinjection'

# metal-dev CDS3TSJRJ
# metal-dev2 CDS9ZQS9Y
# metal C1H4KK2JX
channel = 'C1H4KK2JX'

def update_known_reviews(filename, new_reviews):
    reviews = load_known_reviews(filename)
    updated_reviews = reviews + [v['id'] for v in new_reviews]

    print "updated reviews looks like this: {0}".format(updated_reviews)

    try:
        pickle.dump(updated_reviews, open(filename, 'wb'))
    except Exception, e:
        print "Write Exception: {}".format(e)

def load_known_reviews(filename):
    try:
        reviews = pickle.load(open(filename, 'rb'))
    except Exception, e:
        print "Exception: {}".format(e)
        return []

    return reviews

class RSS:
    def __init__(self, token, feed_url, reviews_file):
        self.token = token
        self.feed_url = feed_url
        self.known_reviews = load_known_reviews(reviews_file)

        self.sc = SlackClient(token)

    def send_message(self, msg, chan):
        self.sc.api_call(
            "chat.postMessage",
            channel=chan,
            text=msg,
            as_user=True,
        )

    def get_new_reviews(self):
        feed = feedparser.parse(self.feed_url)

        if 'entries' not in feed:
            return []

        new_reviews = []

        for entry in feed['entries']:
            if has_missing_keys(entry):
                continue

            match = re.match('^album\s+review:.+', entry['title'], re.IGNORECASE)
            if match is None:
                continue

            # Are we aware of this release?
            if entry['id'] in self.known_reviews:
                continue

            new_reviews.append(entry)

        return new_reviews


def has_missing_keys(map):
    required_keys = ['id', 'title', 'summary', 'link', 'published']

    for k in required_keys:
        if k not in map:
            print "error: missing key in {}".format(k)
            return True

    return False


def main():
    rss = RSS(token, feed_url, reviews_file)
    reviews = rss.get_new_reviews()

    if len(reviews) == 0:
        print "No new reviews"
        sys.exit(0)

    update_known_reviews(reviews_file, reviews)

    for r in reviews:
        msg = ":horns: *New Album Review [{0}]* :horns:\n\n" \
              "{1}".format(r['published'], r['link'])

        print "Date: {}".format(r['published'])
        print "Title: {}".format(r['title'])
        print "Link: {}".format(r['link'])
        print "------------------------------------"

        rss.send_message(msg, channel)


if __name__ == '__main__':
    main()