request_response_logger.rb

#
# Rack middleware to log both request info and server response.
#
# Usage:
# use RequestResponseLogger,
#   :logfile => Rails.root.join('log','mobile.log'),
#   :path => /^\/mobile\//

class RequestResponseLogger
  def initialize(app, options={})
    @app = app
    @logfile = options[:logfile] || options['logfile'] ||
                 File.join(File.dirname(__FILE__),'log','request_response.log')
    @path = options[:path] || options['path'] || /.*/
  end

  def call(env)
    response = @app.call(env)
    log(@logfile, response, env) if env['PATH_INFO'] =~ @path
    response
  end

  def log(logfile, response, env)
    File.open(logfile,'a') {|f|
      f.puts <<-EOF
#{env['REMOTE_ADDR']} at #{Time.now}
[#{env['REQUEST_METHOD']}] #{env['SERVER_NAME']}#{env['PATH_INFO']}
Parameters: #{env['rack.request.query_hash'].inspect}
Response: #{response[0]}
#{response[2].each {|line| f.puts line}}

      EOF
    }
  end
end