Hi Group,
I'm trying to see how Rails at ``startup time'' creates Javascripts within
the Clientside of the browser.
rails s #starting my program
I've used both Byebug within Ruby code and Firefoxe's debugger within the
browser.
==> Firefox's debug shows me the generated scripts like jquery etc but this
is after the fact: the code producing the scripts has already executed.
I want to observe how/when it generates the script and how various
callbacks are registered particularly in jquery. Eg plot function using
flot.
==> Byebug stops when the Ruby code does an eval expression when tracing
from config/application.rb :
I used byebug's set linetrace to observe the following:
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:33
options = {}
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:34 if
config =~ /\.ru$/
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:35
cfgfile = ::File.read(config)
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:36 if
cfgfile[/^#\\(.*)/] && opts
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:39
cfgfile.sub!(/^__END__\n.*\Z/m, '')
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:40 app
= new_from_string cfgfile, config
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49 eval
"Rack::Builder.new {\n" + builder_script + "\n}.to_app",
Tracing:
/Library/Ruby/Gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49 eval
"Rack::Builder.new {\n" + builder_script + "\n}.to_app",
where the eval statement just sits and waits. At that point I had to abort
the program at startup using Cntl C
My questions so far are:
1) how to trace outside programs called by Ruby like Rack::Builder''
above to continue my investigations. Other more powerfull debug tracers to
use? DTRACE?
1.5) Can break points be placed against the source code before the
dynamic tracing begins? or have a pre-programmed script set the breakpoints
at runtime?
2) how is javascript executed by ``Ruby start up'' to manufacture the
local registered scripts: ie, the various crossovers between Ruby and
Javascript contexts
Any pointers to documents/websites/forums where these questions allow me to
continue my investigations is appreciated
I thank you in advance for your ``eyes and ears'' evaluating my request
Dave
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