116 lines
3.3 KiB
Ruby
116 lines
3.3 KiB
Ruby
#
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# Copyright (C) 2011 Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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require 'atom'
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class ExternalFeedAggregator
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def self.process
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ExternalFeedAggregator.new.process
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end
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def initialize
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@logger = Rails.logger
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end
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def process
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Shackles.activate(:slave) do
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start = Time.now.utc
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loop do
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feeds = ExternalFeed.to_be_polled(start).limit(1000).preload(context: :root_account).to_a
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break if feeds.empty?
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feeds.each do |feed|
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Shackles.activate(:master) do
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if !feed.context || feed.context.root_account.deleted?
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feed.update_attribute(:refresh_at, success_wait_seconds.seconds.from_now)
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next
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end
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process_feed(feed)
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end
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end
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end
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end
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end
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def parse_entries(feed, body)
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begin
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require 'rss/1.0'
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require 'rss/2.0'
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rss = RSS::Parser.parse(body, false)
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raise "Invalid rss feed" unless rss
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feed.title = rss.channel.title
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feed.save
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@logger.info("#{rss.items.length} rss items found")
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entries = feed.add_rss_entries(rss)
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@logger.info("#{entries.length} new entries added")
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return true
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rescue
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begin
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require 'atom'
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atom = Atom::Feed.load_feed(body)
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feed.title = atom.title
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feed.save
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@logger.info("#{atom.entries.length} atom entries found")
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entries = feed.add_atom_entries(atom)
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@logger.info("#{entries.length} new entries added")
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return true
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rescue
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end
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end
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false
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end
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def process_feed(feed)
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begin
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@logger.info("feed found: #{feed.url}")
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@logger.info('requesting entries')
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require 'net/http'
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response = CanvasHttp.get(feed.url)
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case response
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when Net::HTTPSuccess
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success = parse_entries(feed, response.body)
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@logger.info(success ? 'successful response' : '200 with no data returned')
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feed.consecutive_failures = 0 if success
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feed.update_attribute(:refresh_at, success_wait_seconds.seconds.from_now)
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else
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@logger.info("request failed #{response.class}")
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handle_failure(feed)
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end
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rescue CanvasHttp::Error, CanvasHttp::RelativeUriError, Timeout::Error, SocketError, SystemCallError => e
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@logger.info("request error: #{e}")
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handle_failure(feed)
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end
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end
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def handle_failure(feed)
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feed.increment(:failures)
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feed.increment(:consecutive_failures)
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feed.update_attribute(:refresh_at, failure_wait_seconds.seconds.from_now)
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end
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def success_wait_seconds
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Setting.get('external_feed_success_wait_seconds', 2.hours.to_s).to_f
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end
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def failure_wait_seconds
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Setting.get('external_feed_failure_wait_seconds', 30.minutes.to_s).to_f
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end
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end
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