Rails core - Oct 2012 - autolog: set_trace_func without all the typing

If it helps anyone developing Rails, apps, or gems, I wrote a shortcut for 
set_trace_func, so next time you want to just add a line before and after 
some function you are trying to debug you can have Ruby temporarily output 
every line, method, etc. executed. Also, it lets you define the format, use 
other loggers, etc. via a proc/lambda define, since you might not like the 
default format. Apologize for posting here if it wouldn''t help with
Rails
development (you are probably using a real debugger).

Example:

In Gemfile add:
gem ''autolog''

Around some part of code add this before:
Autolog.methods
and this after:
Autolog.off

Hope it helps someone who needs a quick tool periodically without all the 
time sink of profiling or setting a breakpoint and debugging in a slow IDE.

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Hmm. Even though Autolog (which mostly just does a set_trace_func) works in 
places like before/after MyRailsApp::Application.configure block in 
development.rb, but putting Autolog.methods at the top of 
application_controller.rb results in a LocalJumpError 
(/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)). Maybe Rails 3.2.8
autoloading
and set_trace_func (calling a lambda, if that matters) is not a good 
combination?:

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
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/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''
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`each''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in
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  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
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/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
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
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/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
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  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''
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/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''
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/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''
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/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''
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/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''
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/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''
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/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!''
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/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''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activeadmin-0.5.0/lib/active_admin.rb:79:in
`routes''
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(required)>''
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/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''
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/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
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/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''
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/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
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/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''
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/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''
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/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''
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/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
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/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!''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application.rb:108:in
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/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!''
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/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
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  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
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:81:in
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/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
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/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
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application/finisher.rb:47:in
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`run''
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/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''
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`each''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/railties-3.2.8/lib/rails/application.rb:136:in
`initialize!''
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/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''
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(required)>''
  from 
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in
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`require''
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<main>''
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`instance_eval''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/builder.rb:51:in
`initialize''
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  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''
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`parse_file''
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`app''
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`app''
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`wrapped_app''
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/path/to/.rvm/gems/ruby-1.9.3-p194@some_app_gemset/gems/rack-1.4.1/lib/rack/server.rb:252:in
`start''
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`start''
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`block in <top (required)>''
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`tap''
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`<top (required)>''
  from script/rails:6:in `require''
  from script/rails:6:in `<main>''


On Wednesday, October 17, 2012 2:28:19 PM UTC-4, Gary Weaver
wrote:
>
> If it helps anyone developing Rails, apps, or gems, I wrote a shortcut for 
> set_trace_func, so next time you want to just add a line before and after 
> some function you are trying to debug you can have Ruby temporarily output 
> every line, method, etc. executed. Also, it lets you define the format, use
> other loggers, etc. via a proc/lambda define, since you might not like the 
> default format. Apologize for posting here if it wouldn''t help
with Rails
> development (you are probably using a real debugger).
>
> Example:
>
> In Gemfile add:
> gem ''autolog''
>
> Around some part of code add this before:
> Autolog.methods
> and this after:
> Autolog.off
>
> Hope it helps someone who needs a quick tool periodically without all the 
> time sink of profiling or setting a breakpoint and debugging in a slow IDE.
>
-- 
You received this message because you are subscribed to the Google Groups
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I forgot to mention the url:
https://github.com/garysweaver/autolog

It''s now a lot more like Tracer and can take blocks, and is available
on
main as method and Object as class method:

autolog :methods do
  #...
end

I put the LocalJumpError up on stackoverflow if anyone wants to help. I 
think it is matter of something not checking if block is given, but I''m
doing it now everywhere in my code, so I think it might somehow be a Rails 
3.2.8 dependency loading issue, but I''m probably incredibly wrong and 
should be smacked in the leg with a wooden paddle for saying that.

Please try my gem and see its new code before just looking at the 
stackoverflow post or attempting to guess based on stacktrace, unless 
you''re feeling lucky:
http://stackoverflow.com/questions/12942505/why-does-using-set-trace-func-work-in-some-places-but-cause-unexpected-return-l

Thanks everyone.


On Wednesday, October 17, 2012 2:28:19 PM UTC-4, Gary Weaver
wrote:
>
> If it helps anyone developing Rails, apps, or gems, I wrote a shortcut for 
> set_trace_func, so next time you want to just add a line before and after 
> some function you are trying to debug you can have Ruby temporarily output 
> every line, method, etc. executed. Also, it lets you define the format, use
> other loggers, etc. via a proc/lambda define, since you might not like the 
> default format. Apologize for posting here if it wouldn''t help
with Rails
> development (you are probably using a real debugger).
>
> Example:
>
> In Gemfile add:
> gem ''autolog''
>
> Around some part of code add this before:
> Autolog.methods
> and this after:
> Autolog.off
>
> Hope it helps someone who needs a quick tool periodically without all the 
> time sink of profiling or setting a breakpoint and debugging in a slow IDE.
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Core" group.
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