Class: RSScache

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rsslist, feedsfilepath = '.', debug: true) ⇒ RSScache

Returns a new instance of RSScache.



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# File 'lib/rsscache.rb', line 16

def initialize(rsslist, feedsfilepath='.', debug: true)

  @dx = open_dynarex(rsslist)
  @rsslist, @feedsfilepath = rsslist, feedsfilepath
  FileUtils.mkdir_p feedsfilepath
  
  @err_report = []
  @debug = debug

end

Instance Attribute Details

#err_report ⇒ Object (readonly)

Returns the value of attribute err_report.



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# File 'lib/rsscache.rb', line 14

def err_report
  @err_report
end

Instance Method Details

#import(raw_s) ⇒ Object

Import a list of URLs into the Dynarex document. URLs which already exist are ignored.



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# File 'lib/rsscache.rb', line 30

def import(raw_s)
  
  s, _ = RXFHelper.read(raw_s)
  
  s.strip.lines.each do |raw_url|

    url = raw_url.chomp
    puts 'url : '  + url.inspect if @debug
    r = @dx.find_by_url url.chomp

    if r then
      puts 'exists' if @debug
    else
      puts 'new URL found' if @debug
      @dx.create url: url
    end
    
  end    
  
  save_dynarex()
end

#open_dynarex(x) ⇒ Object 



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# File 'lib/rsscache.rb', line 99

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

refresh each RSS feed



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# File 'lib/rsscache.rb', line 54

def refresh
  
  @err_report = []

  puts '@dx.to_xml'  + @dx.to_xml(pretty: true)  if @debug
  
  @dx.all.each do |feed|
    
    puts 'feed:' + feed.inspect if @debug
    
    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
  puts '@dx: ' + @dx.to_xml(pretty: true) if @debug
  save_dynarex()

end

#save_dynarex ⇒ Object 



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# File 'lib/rsscache.rb', line 109

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 129

def updates?(feed)

  if @debug then
    puts 'inside updates?' 
    puts 'feed: ' + feed.inspect
  end
  
  # fetch the feeds from the web
  buffer, code = fetch(feed.url)

  if code == 200 then
    rss = SimpleRSS.parse(buffer)
  else
    @err_report << [feed.url, code]
    return false
  end

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

  end
  
  rssfile = File.join(@feedsfilepath, feed.filename)

  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