Development / Ideas

[Neodelf]

Hi there!
Please leave your ideas and proposal in the comments below. This discussion will help us to create new features and developing the lecter.

[Neodelf]

Now gem is working with Rails only. But I want to make it Rack-oriented. It leads to the gem can be used with non-Rails applications.

[evgeniy-r]

You can measure an execution time line-by-line and create some perfomance analyzing tool.

It can be a very simple alternative to New Relic (and other such services) - a free version of New Relic does not show a full trace (Transaction Breakdown in their terms).

[Neodelf]

@evgeniy-r Thank you for the proposal! I like it.
Do you have any ideas about how we can implement it? Which way will be better and faster?

[evgeniy-r]

It is necessary to measure timing for each application code segment, collect this data and show it in the report. Ruby has Benchmark module in the standard library - https://ruby-doc.org/stdlib-2.7.1/libdoc/benchmark/rdoc/Benchmark.html, it can be a starting point.

There are also several open source libraries with benchmark functionality and it may be useful to study them (e. g. https://github.com/schneems/derailed_benchmarks - I don't use it, just for example).

[dcaponi]

I had a question about how deep down a rabbit hole this would go? I see from the example it highlights LOC that get hit on the controller, but will it also show LOC from imported code? If my project uses #method_missing or some other meta programming tricks, would this show that or are there plans for that?

I ask because one of the problems I encounter on ruby projects is thinking I can delete some "dead code" only to find out its being invoked via some unclear code path or required by convention.

[Neodelf]

Yep, it could grab all executed code from all gems you have. In that case, there will so many lines and a request is stopped by a timeout error. So one of the next purposes is to define paths (file) which could be added to trace. The comparison is happened in lib/lecter/trace_point.rb

The gem shows only executed code. It depends on parameters are passed.
It doesn't show you code that is "dead" in other classes which were not called in the request.

[Neodelf]

Metaprogramming tricks also will be shown if the line is executed