Class: RSScache

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

Instance Method Summary collapse

Constructor Details

#initialize(rsslist, feedsfilepath = Dir.pwd) ⇒ RSScache

Returns a new instance of RSScache.



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# File 'lib/rsscache.rb', line 13

def initialize(rsslist, feedsfilepath=Dir.pwd)

  @dx = open_dynarex(rsslist)
  @rsslist, @feedsfilepath = rsslist, feedsfilepath
  FileUtils.mkdir_p feedsfilepath

end

Instance Method Details

#open_dynarex(x) ⇒ Object 



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# File 'lib/rsscache.rb', line 60

def open_dynarex(x)

  if x.lines.length == 1 and File.exists?(x) and \
                                    File.extname(x) == '.txt'then
    Dynarex.new.import x
  else
    Dynarex.new x
  end
end

#refresh ⇒ Object Also known as: update 



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# File 'lib/rsscache.rb', line 21

def refresh

  @dx.all.each do |feed|

    if feed.next_refresh.empty? or \
                           Time.now >= Time.parse(feed.next_refresh) then

      any_new_items = updates? feed

      feed.refresh_rate = if feed.refresh_rate.empty? then

        10 

      else

        if Time.now > Time.parse(feed.next_refresh) + \
                        feed.refresh_rate.to_i and not any_new_items then
          feed.refresh_rate.to_i + 10
        end

      end


      feed.next_refresh = Time.now + feed.refresh_rate.to_i * 60


    else

      feed.refresh_rate = feed.refresh_rate.to_i - 10 if feed.refresh_rate.to_i > 10

    end
  end

  save_dynarex()

end

#save_dynarex ⇒ Object 



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# File 'lib/rsscache.rb', line 70

def save_dynarex()

  if @rsslist.lines.length == 1 and File.exists?(@rsslist)

    if File.extname(@rsslist) == '.txt'then

      File.write @rsslist, @dx.to_s

    else

      @dx.save

    end

  end
end

#updates?(feed) ⇒ Boolean

checks for any updates and saves the latest RSS file to

the cache if there is

Returns:

  • (Boolean) 


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# File 'lib/rsscache.rb', line 90

def updates?(feed)

  # fetch the feeds from the web
  rss = SimpleRSS.parse(open(feed.url))

  
  rssfile = if feed.filename.empty? then
    filename = feed.url[6..-1].gsub(/\W+/,'').\
                        reverse.slice(0,40).reverse.downcase + '.xml'
    feed.filename = filename
    File.join(@feedsfilepath, filename)      
  end
  
  if File.exists? rssfile then

    rss_cache = SimpleRSS.parse File.read(rssfile)
    new_rss_items = rss.items - rss_cache.items
    (File.write rssfile, rss.source; return true) if new_rss_items.any?
    
  else

    File.write rssfile, rss.source
    feed.title = rss.title if feed.title.empty?

    return true
    
  end
  
  return false
end