lukehamilton
7/9/2012 - 8:52 PM

Example files implementing the log-driven slideshow described in "Spend time with your site" post (http://artsy.github.com/blog/2012/07/05/s

Example files implementing the log-driven slideshow described in "Spend time with your site" post (http://artsy.github.com/blog/2012/07/05/spend-time-with-your-site/).

index.html
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<html>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript">
      $(function() {
        window.lastPath = '';  // useful to avoid reloading identical page
        var loadNext = function() {
          $.getJSON('/latest', function(path) {
            if (path && !window.lastPath.match(path)) {
              window.frames[0].location.href = "http://example.com" + path;
              window.lastPath = path;
            }
          });
        };
        loadNext();
        setInterval(function() {
          loadNext();
        }, 20000);
      });
    </script>
  </head>
  <body style="margin:0;overflow:hidden;">
    <iframe height="100%" width="100%"></iframe>
  </body>
</html>
config.ru
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require 'rubygems'
require 'sinatra'
require File.dirname(__FILE__) + "/app.rb"

run Sinatra::Application
app.rb
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require 'rubygems'
require 'sinatra'
require 'json'

get '/latest' do
  # This is where the [ugly] magic happens. Grep an appropriate path from the _end_ of the incoming log file,
  # excluding office IP range and paying special attention to escaping...
  line = `tac /var/log/heroku.log | grep ".*GET [^\?]*/home\/[^/ \\"]*" | grep -v "controls\\|pending\\|99\\.99\\." -m 1`
  if match = line.match(/\/home\/([a-z0-9\-]*)/i)
    return match[1].to_json
  end
  return nil
end