Class: Trackchange::Probe

Inherits:
Struct
  • Object
show all
Defined in:
lib/trackchange/probe.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config

Returns:

  • (Object) —

    the current value of config



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# File 'lib/trackchange/probe.rb', line 9

def config
  @config
end

Class Method Details

.run(config) ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 12

def run(config)
  new(config).run
end

Instance Method Details

#faraday ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 21

def faraday
  @faraday ||= Faraday.new do |f|
    f.request :url_encoded
    f.adapter Faraday.default_adapter
  end
end

#logger ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 152

def logger
  return @logger if @logger
  @logger = Logger.new(STDOUT).tap do |logger|
    logger.level = (config.log_level || 2).to_i
    logger.formatter = proc do |severity, datetime, progname, msg|
      "#{msg}\n"
    end
  end
end

#probe(site) ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 35

def probe(site)
  url = site[:url]
  fname = url.sub(%r{https?://}, '').tr_s('/?&', '...')
  site_path = File.expand_path(fname, '~/.trackchange')

  # build cmd
  cmd = config.fetch  + "> #{site_path}.new"
  substitutions = {
    url: url,
    queryscript: File.expand_path('../query.coffee', __FILE__),
    selector: site[:selector]
  }
  substitutions.each { |key, value| cmd = cmd.gsub("%#{key}%", value.to_s) }
  logger.debug "% #{cmd}"
  system cmd

  unless File.exist?(site_path) # new site
    logger.warn "new site #{url}"
    FileUtils.mv("#{site_path}.new", site_path)
    return
  end

  diff = "diff -u #{site_path} #{site_path}.new"
  logger.debug "% #{diff}"
  result = %x[ #{diff} ]

  if result.empty? # same old
    logger.info "same old #{url}"
    FileUtils.rm_f("#{site_path}.new")
    return
  end

  if site[:threshold]
    diffgrepwc = "#{diff} | grep '^[-+]:' | wc -l"
    logger.debug "% #{diffgrepwc}"
    degree = %x[ #{diffgrepwc} ]
    if degree.to_i < site[:threshold].to_i
      logger.warn 'change below threshold, skipping notification'
      skip_notification = true
    end
  end

  # changed
  logger.warn "changed #{url}"
  if pat = config.archive_pattern
    time = File.ctime(site_path).strftime(pat)
    logger.info "archived #{site_path}.#{time}"
    FileUtils.mv(site_path, "#{site_path}.#{time}")
  end
  FileUtils.mv("#{site_path}.new", site_path)

  return if skip_notification

  if slack_hook = config.slack_hook
    message = slack_defaults.merge(config.slack.to_h)
    message['text'] = "#{url}\n\n#{result}"
    faraday.post slack_hook, payload: JSON.unparse(message)
  end

  if email = config.email # send email
    logger.info "sending notification to #{email}"
    begin
      file = Tempfile.new('changetrack')
      file.write "#{url}\n\n#{result}"
      file.close
      mail = "cat #{file.path} | mail -s 'Change detected on #{url}' #{email}"
      logger.debug mail
      system mail
    ensure
      file.unlink
    end
  end

  if file = File.expand_path(config.rss_path, ENV['HOME']) # write rss
    logger.info "update rss feed '#{file}'"

    out_rss = RSS::Maker.make('1.0') do |maker|
      maker.channel.id = %x[ whoami ].chomp
      maker.channel.author = %x[ whoami ].chomp
      maker.channel.updated = Time.now.to_s
      maker.channel.title = "Trackchange"
      maker.channel.link = "http://github.com/brnach14/trackchange"
      maker.channel.about = "Feed of detected changes"
      maker.channel.description = "Feed of detected changes"

      # new item
      maker.items.new_item do |item|
        item.link = "#{url}##{Time.now.to_i}"
        item.title = "Change detected on #{url}"
        item.date = Time.now.to_s
        item.description = "<pre>#{result}</pre>"
      end

      # read rss, keepn old items
      if File.exist?(file)
        in_rss = RSS::Parser.parse(File.read(file))
        in_rss.items.each_with_index do |in_item, index|
          break if index > config.feed_size - 1
          maker.items.new_item do |out_item|
            out_item.link = in_item.link
            out_item.title = in_item.title
            out_item.date = in_item.date
            out_item.description = in_item.description
          end
        end
      end
    end

    # write rss
    if File.exist?(file) and !File.writable?(file)
      raise "'#{file}' is not writable, skipping rss persistency"
    else
      File.open(file, 'w') { |f| f.puts(out_rss) }
    end
  end
end

#run ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 17

def run
  config.sites.each { |site| probe(site) }
end

#slack_defaults ⇒ Object 



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# File 'lib/trackchange/probe.rb', line 28

def slack_defaults
  {
    'username' => 'trackchange',
    'icon_emoji' => ':fax:'
  }
end