Class: Feedbook::Listener

Inherits:
Object
  • Object
show all
Defined in:
lib/feedbook/listener.rb

Class Method Summary collapse

Class Method Details

.load_feeds_archive(path) ⇒ Array

Load feeds from serialized YAML file.

Parameters:

  • path (String) —

    to YAML file with serialized objects

Returns:

  • (Array) —

    Array of feeds with archived posts



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# File 'lib/feedbook/listener.rb', line 72

def self.load_feeds_archive(path)
  print 'Reading feeds from file... '

  if File.exist? path
    puts 'completed.'
    YAML::load(File.read(path))
  else
    puts 'canceled. File does not exist.'
    []
  end
end

.observe_and_notify(feed) ⇒ NilClass

Single run of loop for listening for changes in RSS feeds and notifies about updates

Parameters:

  • feed (Feedbook::Feed) —

    requested feed to be observed (hash with feed and posts)

Returns:

  • (NilClass) —

    nil



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# File 'lib/feedbook/listener.rb', line 104

def self.observe_and_notify(feed)
  new_posts = feed[:feed].fetch

  difference = Comparers::PostsComparer.get_new_posts(feed[:posts], new_posts)
  
  if difference.empty?
    puts 'No new posts found.'
  else
    puts "#{difference.size} new posts found."
    print 'Started sending notifications... '
  end

  difference.each do |post|
    feed[:feed].notifications.each do |notification|
      notification.notify(post)
    end
  end

  unless difference.empty?
    puts 'completed.'
  end

  feed[:posts] = new_posts

  feed
end

.save_feeds_archive(path, feeds) ⇒ NilClass

Saves feeds into serialized YAML file

Parameters:

  • path (String) —

    path to file

  • feeds (Array) —

    Array with feeds to be saved

Returns:

  • (NilClass) —

    nil



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# File 'lib/feedbook/listener.rb', line 89

def self.save_feeds_archive(path, feeds)
  print 'Saving feeds to file... '

  File.open(path, 'w') do |f|
    f.write YAML::dump(feeds)
  end

  puts 'completed.'
end

.start(path, plugins_path) ⇒ Object

Starts listening on feeds and notifies if there is new post.

Parameters:

  • path (String) —

    configuration file path

  • plugins_path (String) —

    plugins directory path



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# File 'lib/feedbook/listener.rb', line 15

def self.start(path, plugins_path)
  handle_exceptions do
    feeds, configuration = initialize_listener(path, plugins_path)

    print 'Fetching feeds for the first use... '
    observed_feeds = feeds.map do |feed|
      {
        feed:  feed,
        posts: feed.fetch
      }
    end
    puts 'completed.'

    puts 'Listener started...'
    every configuration.interval do
      
      puts 'Fetching feeds...'
      observed_feeds.each do |feed|
        observe_and_notify(feed)
      end
    end
  end
end

.start_offline(path, archive_path, plugins_path) ⇒ Object

Starts listening on feeds and notifies if there is new post (offline mode).

Parameters:

  • path (String) —

    configuration file path

  • plugins_path (String) —

    plugins directory path



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# File 'lib/feedbook/listener.rb', line 42

def self.start_offline(path, archive_path, plugins_path)
  handle_exceptions do
    feeds, configuration = initialize_listener(path, plugins_path)

    observed_feeds = load_feeds_archive(archive_path)

    if observed_feeds.blank?
      print 'Fetching feeds for the first use... '
      observed_feeds = feeds.map do |feed|
        {
          feed: feed,
          posts: feed.fetch
        }
      end
      puts 'completed.'
    end

    puts 'Fetching feeds...'
    observed_feeds.each do |feed|
      observe_and_notify(feed)
    end

    save_feeds_archive(archive_path, observed_feeds)
  end
end