Get stacktrace classes, not just files, in Ruby - ruby

Question

My goal is to find if the current stack has ActionJob::Base in it to see if it came from a background job.
I figure the way to do that is calling classes for my current location in ruby so I can search and find ActionJob::Base ancestor class in the call stack.
There are a few ways to get a stacktrace/backtrace from the current location in ruby. They involve Thread.current.backtrace. That results in an array of strings as filenames but not classes that were called. i.e.
/Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:537:in `eval_input'
/Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:472:in `block in run'
/Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:471:in `catch'
/Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:471:in `run'
/Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:400:in `start'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/railties-6.1.3.2/lib/rails/commands/console/console_command.rb:70:in `start'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/railties-6.1.3.2/lib/rails/commands/console/console_command.rb:19:in `start'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/railties-6.1.3.2/lib/rails/commands/console/console_command.rb:102:in `perform'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/thor-1.1.0/lib/thor/command.rb:27:in `run'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/thor-1.1.0/lib/thor/invocation.rb:127:in `invoke_command'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/thor-1.1.0/lib/thor.rb:392:in `dispatch'
/Users/justin/dev/testarea/lamby_discovery/vendor/bundle-dev/ruby/2.7.0/gems/railties-6.1.3.2/lib/rails/command/base.rb:69:in `perform'
byebug's backtrace has the information that I'm looking for (i.e. IRB::Context), but doesn't seem searchable and backtrace is a c method.
--> #0 IRB::Context.set_last_value(value#NilClass) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/context.rb:363
#1 IRB::Context.evaluate(line#String, line_no#Integer, exception#NilClass) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/context.rb:459
#2 block (2 levels) in IRB::Irb.block (2 levels) in eval_input at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:541
#3 IRB::Irb.signal_status(status#Symbol) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:704
#4 block in IRB::Irb.block in eval_input at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:538
#5 block (2 levels) in RubyLex.block (2 levels) in each_top_level_statement at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/ruby-lex.rb:166
ͱ-- #6 Kernel.loop at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/ruby-lex.rb:151
#7 block in RubyLex.block in each_top_level_statement at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/ruby-lex.rb:151
ͱ-- #8 Kernel.catch(*args) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/ruby-lex.rb:150
#9 RubyLex.each_top_level_statement at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb/ruby-lex.rb:150
#10 IRB::Irb.eval_input at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:537
#11 block in IRB::Irb.block in run(conf#Hash) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:472
ͱ-- #12 Kernel.catch(*args) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:471
#13 IRB::Irb.run(conf#Hash) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:471
#14 #<Class:IRB>.start(ap_path#NilClass) at /Users/justin/.rbenv/versions/2.7.3/lib/ruby/2.7.0/irb.rb:400
Any recommendations?

Answer 1

My idea is loop through caller (you can limit, eg. caller.first(10)), and each of them, i'll load source code then check whether source string include? the target class or not (eg. ActionJob::Base).
Here is my solution, i use gem solargraph which help to parse source code (parse namspace, constants, methods, ...), in your case, we need to find any caller class has superclass is ActionJob::Base, right ? Solargraph support we do it:
gem 'solargraph', group: :development
bundle install
# debug helper
class Debug
def self.search_super(caller, super_clazz)
detect_paths = []
caller.each do |caller_path|
unless caller_path.nil?
filepath = caller_path.split(':').first
source = Solargraph::Source.load_string(File.read(filepath), filepath)
map = Solargraph::SourceMap.map(source)
detect = map.pins_by_class(Solargraph::Pin::Reference::Superclass)
.select { |clazz|
clazz.to_s == super_clazz.to_s
}
unless detect.blank?
detect_paths << filepath
end
end
end
detect_paths
end
end
then for example, you want to detect which job call the method Demo#search, you can set a break point on that method
class Demo
def search
binding.pry
end
end
and check in console
> Debug.search_super(caller, "ActionJob::Base")
note I tested on myside to detect superclass "ActionController::Base" (rails) and it worked, but i've not tested for ActionJobs yet.