Debugging under Passenger

Jeroen Bulters do 18 mrt 10

Sometimes… you just have to debug something in a ‘live’ (i.e. staging) environment. Or you just enjoy using Passenger as a development platform. Either way, when using Passenger, you lose the plain-old “—debugger” option which – in my opinion – has proven itself to be indispensible to debug Rails applications. Luckily, there is a solution: ruby-debug.

To use ruby-debug with passenger, we specify the following in our environment file (be it production or development):.

if File.exists?(File.join(Rails.root,'tmp', 'debugger.txt'))
  require 'ruby-debug'

  Debugger.wait_connection = true
  Debugger.start_remote

  File.delete(File.join(Rails.root,'tmp', 'debugger.txt'))
end

Starting a debugger waiting for a remote connection if the debugger.txt file exists in our tmp directory. Just touch both the tmp/debugger.txt file and the tmp/restart.txt file and a debugger session will be waiting for you as soon as the Passenger process has respawned.

Connect with the debugger with “rdebug -c”; et voila!

One drawback, the incredibly handy irb function of rdb is not available in remote-mode.

Gepost in hor |  0 reacties