Rails如何在heroku上为rake任务创建后台任务

Question

可能重复：
轨道延迟作业不工作

如何在heroku上创建每15分钟运行一次的后台任务？

如何使用clockwork和delayed_job进行周期性刮擦？其他插件/宝石是什么？

我的rake文件：

desc "Importer statistikker"
namespace :reklamer do
task :runall => [:iqmedier, :euroads, :mikkelsen, :orville ] do
  # This will run after all those tasks have run
end
      task :iqmedier => :environment do
              require 'Mechanize'
              agent = WWW::Mechanize.new
              agent.get("http://www.iqmedier.dk")
              agent.page.link_with(:href => "/Publisher/Stats").click
              form = agent.page.forms.first
              form.submit
              @stats = agent.page.search('//tr')[-2]
              @existing = Reklamer.find(:first, :conditions => {:dato => @stats[0]})
              if @existing.nil?
                  Reklamer.create!(:virksomhed => 'Iqmedier', :vis => @stats[4], :leads => @stats[5], :ordre => @stats[6], :cpc => @stats[7], :earn => @stats[8])
              elsif @existing.dato != Date.today
              Reklamer.create!(:virksomhed => 'Iqmedier', :dato => Date.today, :unik_klik => 0, :klik => 0, :unik_vis => 0, :vis => 0, :leads => 0, :ordre => 0, :cpc => 0, :earn => 0)
              else
                @existing.update_attributes!(:leads => @stats[5], :ordre => @stats[6], :cpc => @stats[7], :earn => @stats[8])
              end
      end
      task :euroads => :environment do
            require 'Mechanize'
            require 'pp'
            agent = Mechanize.new { |agent|
            agent.user_agent_alias = 'Mac Safari'}
            agent.get("http://www.euroads.dk")
            @stats =  agent.page.search('table.ea')
            @existing = Reklamer.find(:first)
            if @existing.nil?
                Reklamer.create!(:klik => @stats[2].to_i, :unik_vis => @stats[3], :vis => @stats[4], :leads => @stats[5], :ordre => @stats[6], :cpc => @stats[7], :earn => @stats[8])
            elsif @existing.dato != Date.today
              Reklamer.create!(:virksomhed => 'Euroads', :dato => Date.today, :unik_klik => 0, :klik => 0, :unik_vis => 0, :vis => 0, :leads => 0, :ordre => 0, :cpc => 0, :earn => 0)
            else
              @existing.update_attributes(:unik_klik => :leads => @stats[5], :ordre => @stats[6], :cpc => @stats[7], :earn => @stats[8])
            end
      end
      task :mikkelsen => :environment do
            require 'Mechanize'
            agent = Mechanize.new
            agent.get("http://affilate.mikkelsenmedia.dk")
            @stats = agent.page.search('//tr')[-5].search('td').map{ |n| n.text }
            @existing = Reklamer.find(:first, :conditions => {:dato => @stats[0] })
            if @existing.nil?
                Reklamer.create!(:virksomhed => 'Mikkelsen', :dato => @stats[0], :unik_klik => @stats[3], :klik => @stats[3].to_i, :unik_vis => @stats[1], :vis => @stats[1], :leads => @stats[4], :ordre => @stats[9], :cpc => @stats[3], :earn => @stats[5])
            else
                @existing.update_attributes(:virksomhed => 'Mikkelsen', :dato => @stats[0], :unik_klik => @stats[3], :klik => @stats[3].to_i, :unik_vis => @stats[1], :vis => @stats[1], :leads => @stats[4], :ordre => @stats[9], :cpc => @stats[3], :earn => @stats[5])
            end
       end
      task :orville => :environment do
            require 'Mechanize'
            agent = WWW::Mechanize.new
            agent.get("https://dk.orvillemedia.com")
            @dato = Date.today.strftime("%Y-%m-%d").to_s
            @month = Date.today.strftime("%m").to_s
            @day = Date.today.strftime("%d").to_s
            agent.get("https://dk.orvillemedia.com/publisher/stats.php?sd=#{@day}&sm=#{@month}")
            @stats = agent.page.search('td')
            @existing = Reklamer.find(:first, :conditions => {:dato => @dato})
            if @existing.nil?
                Reklamer.create!(:vis => @stats[1], :leads => @stats[3], :ordre => '0')
            else
              @existing.update_attributes(:ordre => '0', :cpc => (@stats[5] == '-' ? 0 : @stats[3]), :earn => @stats[6])
            end
       end
       end

Answer 1

在您的Gemfile:中

gem 'delayed_job'

在库/scraper.rb:中

class Scraper
  def perform
    # All the scraping code you need to run goes here.
  end
  def error(job, exception)
    # Send a warning email to yourself, or whatever.
    # The scraping will automatically be retried.
  end
  def success(job)
    # Schedule the next scraping.
    Delayed::Job.enqueue(Scraper.new, :run_at => 15.minutes.from_now)
  end
end

然后启动最初的Scraper，它将从那里处理事情。在heroku控制台中，运行：

Scraper.new.perform

你需要有一个工人一直在运行才能运行废料。

Answer 2

这会为您提供每小时的任务：http://addons.heroku.com/cron