RSSReader

gistfile1.rb

require 'rss'
require 'net/http'
require 'uri'
require 'time'

Net::HTTP.version_1_2

class RSSReader
  @@http = Net::HTTP

  def initialize(cachefile, target)
    @cachefile = cachefile
    file = File.open(@cachefile).readlines
    @cache_time = file[0]
    @cache = file[1..file.length] ? eval(file[1..file.length].join('')) : []
    @target = target
    @time = Time.new
    @updated = []
  end
  
  attr_accessor :updated
  
  def check
    i = 0
    list = []
    @target.each do |a|
      uri = URI.parse(a)
      begin
        body = recv(uri.host, uri.path, uri.port)
        next if body.nil?
        RSS::Parser.parse(body, true).items.each do |item|
          hash = {
            :title => item.title,
            :description => item.description,
            :link => item.link
          }
          list << hash
          if @cache.include?(hash)
            i += 1
            break
          else
            @updated << i
            i += 1
          end
        end
      rescue
        next
      end
    end
    cachefile_write("#{@time}\n#{list.inspect}")
    list
  end
  
  def cache
   return @cache if @cache_time && Time.parse(@cache_time) + 1800 > @time
   return nil
  end
  
  def proxy(addr, port)
    @@http = @@http.Proxy(addr, port)
  end
  
  private
  def cachefile_write(content)
    loop do
      begin
        Dir.mkdir("rss")
          begin
            File.open(@cachefile, "w").write(content)
          rescue
          
          end
        Dir.unlink("rss")
        return
      rescue
        sleep 0.01
      end
    end
  end
  
  def recv(domain, path, port = 80)
    @@http.start(domain, port) { |h| return h.get(path).body}
  end
end

gistfile2.rb

rss = RSSReader.new("cache.dat", File.open("list.dat").readlines)
list = rss.check
#第二引数に渡したRSSから更新のあったもののみ出力したい。
rss.updated.each do |i|
  puts list[i]
end

#キャッシュが有効か確認した後、RSSの名前のみ取り出して一覧表示。
list = rss.cache || rss.check
list.each do |h|
  puts h[:title]
end