Method::Tracer

The gem provides OpenTracing instrumentation for custom Ruby methods.

Installation

Add this line to your application's Gemfile:

gem 'method-tracer'

And then execute:

$ bundle

Or install it yourself as:

$ gem install method-tracer

Usage

First of all you need to initialize the gem using Method::Tracer.configure method. You need to supply an instance of a tracer, and an active span provider - a proc which returns a current active span. The gem plays nicely with spanmanager.

require 'spanmanager'
require 'method-tracer'

OpenTracing.global_tracer = SpanManager::Tracer.new(OpenTracing.global_tracer)
Method::Tracer.configure(tracer: OpenTracing.global_tracer,
                        active_span: -> { OpenTracing.global_tracer.active_span })

The gem comes in two flavours. You can either use 'magic mode', and include Method::Tracer module and then use trace_method method, or skip the magic and use Method::Tracer.trace class method within your business code. See usage examples below:

class TracedClass
  class << self
    def class_method
    end

    include Method::Tracer
    trace_method :class_method
  end

  def instance_method
    Method::Tracer.trace("inner span") do |span|
      # business code
    end
  end

  include Method::Tracer
  trace_method :instance_method
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/iaintshine/ruby-method-tracer. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.