gistfile1.ru

# Ops middleware, provides /ops/version that gives you information about your deployed application
# Use:
#   Dump this code in lib/middleware/ops.rb
#   Add the following line to your environment.rb:
#      config.middleware.use Rack::Ops
#



module Rack
  class Ops
  
    def initialize(app)
      @app = app
      yield self if block_given?
    end
  
    def call(env)
      return @app.call(env) unless env['PATH_INFO'] =~ %r{^/ops/version/?$}
      
      @status = 200
      @headers = {}

      version
      @body = version_template
      
      @headers['Content-Type'] = "text/html"
      @headers['Content-Length'] = @body.length.to_s
    
      [@status, @headers, @body]
    end
  
    private
    def version
      begin
        @version = ::File.read('./VERSION').chomp.gsub('^{}', '')
        @deploy_date = ::File.stat('./VERSION').mtime
      rescue Errno::ENOENT
      ensure
        @version ||= "Unknown (VERSION file is missing)"
        @deploy_date ||= "Unknown (VERSION file is missing)"
      end
      begin
        @git_version = ::File.read('./REVISION').chomp
      rescue Errno::ENOENT
      ensure
        @git_version ||= "Unknown (REVISION file is missing)"
      end
      app_name
      @hostname = %x(/bin/hostname) 
      @hostname = @hostname.blank? ? "Unknown" : @hostname
    end
  
    def app_name
      @app_name ||= Dir.pwd.split('/').last
    end
  
    def headers
      hh = @headers.select{|k,v| k.match(/^HTTP.*/) }
      return if hh.blank?
      ret = "<table border='1' style='width:100%'>"
      hh.each { |k, v| ret += "<tr><td>#{k}</td><td>#{v}</td></tr>" }
      ret += "</table>"
    end

    def version_link
      return @version if @version =~ /^Unknown/
      "<a href='https://github.com/primedia/#{@app_name}/tree/#{@version}' style='font-size: 20px;'>#{@version}</a>"
    end
  
    def git_version_link
      return @git_version if @git_version =~ /^Unknown/
      "<a href='https://github.com/primedia/#{@app_name}/commit/#{@git_version}' style='font-size: 20px;'>#{@git_version}</a>"
    end
    
    def version_template
      <<-HTML
        <div class='container' style=' width: 1000px;'> 
          <div class='spacer'></div> 
          <div id='version'> 
            <div class='label'>#{@app_name} Version</div> 
            <div class='value'>#{version_link}</div> 
          </div> 
          <div class='spacer'></div> 
          <div id='date'> 
            <div class='label'>Date Deployed:</div> 
            <div class='value'>#{@deploy_date}</div> 
          </div> 
          <div class='spacer'></div> 
          <div id='commit'> 
            <div class='label'> 
              Last Commit:
            </div> 
            <div class='value'> 
              #{git_version_link}
            </div> 
          </div> 
          <div class='spacer'></div> 
          <div id='host'> 
            <div class='label'> 
              Host:
            </div> 
            <div class='value'> 
              #{@hostname}
            </div> 
          </div>
          <div class='spacer'></div>
          <div id='headers'> 
            <div class='label'> 
              Headers:
            </div> 
            <div class='value'>
              #{headers}
            </div> 
          </div>
          <div class='spacer'></div>
          <div id='environment'> 
            <div class='label'>Environment:</div> 
            <div class='value'>#{ENV['RAILS_ENV']}</div> 
          </div> 
        </div> 
        <style> 
          .container    {font-size: 20px;}
          .label        {float: left; width: 400px;}
          .spacer       {clear: both; padding: 10px;}
          .value        {float: left; width: 500px; text-align: right;}
          .clear        {clear: both;}
        </style>
      HTML
    end
  
  end
end

Great script! I like the idea, but what version of rails is this good for?

I believe rack middle ware was added in 2.3.4 or 2.3.5. I know this works with 2.3.5.