The following is a generalized piece of code in gem I'm working on:
module SomeModule class << self attr_accessor :procedure def log_events(*args) args.flatten! if args.size == 1 eval "set_trace_func proc {|event, file, line, id, binding, classname| begin; SomeModule.procedure.call(event, file, line, id, binding, classname) if event == #{args[0].inspect}; rescue SystemExit, Interrupt; raise; rescue Exception; end}" elsif args.size > 1 eval "set_trace_func proc {|event, file, line, id, binding, classname| begin; SomeModule.procedure.call(event, file, line, id, binding, classname) if #{args.inspect}.include?(event); rescue SystemExit, Interrupt; raise; rescue Exception; end}" else # ... end end end end SomeModule.procedure = lambda {|event, file, line, id, binding, classname| puts "#{event} #{file}.#{line} #{binding} #{classname} #{id}"}
When i call:
SomeModule.log_events 'call', 'return'
just before the configure block in my Rails config/environments/development.rb application, it works fine and continues to work.
But when I call it in app/controllers/application_controller.rb above or below the class definition, Rails dies during startup at activesupport-3.2.8 / lib / active_support / dependencies.rb: 469 due to an unexpected return (LocalJumpError).
Here is the log:
return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb.30 #<Binding:0x007ff7b1403d40> Rails::Initializable::Initializer run return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb.54 #<Binding:0x007ff7b14039a8> Rails::Initializable run_initializers return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application.rb.136 #<Binding:0x007ff7b1403728> Rails::Application initialize! return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/railtie/configurable.rb.30 #<Binding:0x007ff7b1403480> Rails::Railtie::Configurable::ClassMethods method_missing call /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.275 #<Binding:0x007ff7b1402aa8> ActiveSupport::Dependencies::Blamable blame_file! return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.277 #<Binding:0x007ff7b1402440> ActiveSupport::Dependencies::Blamable blame_file! return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.233 #<Binding:0x007ff7b1401a40> ActiveSupport::Dependencies::Loadable load_dependency return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb.251 #<Binding:0x007ff7b1409790> ActiveSupport::Dependencies::Loadable require return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb.51 #<Binding:0x007ff7b14093f8> Rack::Builder initialize return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb.40 #<Binding:0x007ff7b1408ac0> Rack::Builder parse_file return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb.200 #<Binding:0x007ff7b1408840> Rack::Server app return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb.46 #<Binding:0x007ff7b1408598> Rails::Server app return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb.301 #<Binding:0x007ff7b14082f0> Rack::Server wrapped_app return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb.252 #<Binding:0x007ff7b1408048> Rack::Server start call /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb.179 #<Binding:0x007ff7b1407c88> Rack::Server options return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb.181 #<Binding:0x007ff7b14078f0> Rack::Server options Exiting return /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb.74 #<Binding:0x007ff7b1406ec8> Rails::Server start /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `load': unexpected return (LocalJumpError) from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `block in load_file' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:639:in `new_constants_in' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:468:in `load_file' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:353:in `require_or_load' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:502:in `load_missing_constant' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:192:in `block in const_missing' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `each' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `const_missing' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller/menu.rb:2:in `<module:ActiveAdmin>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller/menu.rb:1:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/base_controller.rb:2:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller/actions.rb:2:in `<module:ActiveAdmin>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller/actions.rb:1:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/resource_controller.rb:2:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/batch_actions.rb:7:in `block in <top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:25:in `call' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:25:in `block in dispatch' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:24:in `each' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/event.rb:24:in `dispatch' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/application.rb:179:in `load!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/application.rb:205:in `routes' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin.rb:79:in `routes' from /path/to/git/some_app_gemset/config/routes.rb:2:in `block in <top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:282:in `instance_exec' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:282:in `eval_block' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:260:in `draw' from /path/to/git/some_app_gemset/config/routes.rb:1:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `block in load' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in `each' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:40:in `load_paths' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application/routes_reloader.rb:16:in `reload!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application.rb:108:in `reload_routes!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/reloader.rb:34:in `reload!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activeadmin-0.5.0/lib/active_admin/reloader.rb:61:in `block in attach!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:429:in `_run__1105766863370890952__prepare__156232144867029268__callbacks' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:405:in `__run_callback' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:385:in `_run_prepare_callbacks' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in `run_callbacks' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/middleware/reloader.rb:74:in `prepare!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/actionpack-3.2.8/lib/action_dispatch/middleware/reloader.rb:48:in `prepare!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application/finisher.rb:47:in `block in <module:Finisher>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `instance_exec' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `run' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:55:in `block in run_initializers' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `each' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `run_initializers' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/application.rb:136:in `initialize!' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in `method_missing' from /path/to/git/some_app_gemset/config/environment.rb:5:in `<top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require' from /path/to/git/some_app_gemset/config.ru:4:in `block in <main>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize' from /path/to/git/some_app_gemset/config.ru:1:in `new' from /path/to/git/some_app_gemset/config.ru:1:in `<main>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb:200:in `app' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb:46:in `app' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/rack-1.4.1/lib/rack/server.rb:252:in `start' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands/server.rb:70:in `start' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:55:in `block in <top (required)>' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap' from /path/to/.rvm/gems/ ruby-1.9.3-p194@some _app_gemset/gems/railties-3.2.8/lib/rails/commands.rb:50:in `<top (required)>' from script/rails:6:in `require' from script/rails:6:in `<main>'
Any idea what I'm doing wrong, or how to determine when and where this type of use of set_trace_func should work?