Elasticsearch::Tracer

OpenTracing instrumentation for Ruby Elasticsearch client.

Installation

Add this line to your application's Gemfile:

gem 'elasticsearch-tracer'

And then execute:

$ bundle

Or install it yourself as:

$ gem install elasticsearch-tracer

Usage

Elasticsearch gem allows you to customize transport layer (that's where the gem hooks up). To do that you simply pass transport argument to the client constructor, or inject it at run-time using transport accessor. See Elasticsearch Transport Implementations for more info. If you use vanilla client without any modifications, that's also fine.

The gem exposes a tracing and wrapping transport Elasticsearch::Tracer::Transport. To enable instrumentation of a client, leave the construction intact. Once you got the client, create an instance of Elasticsearch::Tracer::Transport. Pass the original transport, tracer and optionally active_span, an active span provider. Now the last step is to inject the tracing transport. See the example below.

require 'elasticsearch'
require 'elasticsearch-tracer'

client = Elasticsearch::Client.new
client.transport = Elasticsearch::Tracer::Transport.new(tracer: OpenTracing.global_tracer,
                                                        active_span: -> { OpenTracing.global_tracer.active_span },
                                                        transport: client.transport)

If you use Elasticsearch::Client with default Faraday transport you might want to use Faraday::Tracer middleware as shown below. It injects OT context.

require 'elasticsearch'
require 'elasticsearch-tracer'
require 'faraday/tracer'

client = Elasticsearch::Client.new do |faraday|
  faraday.use Faraday::Tracer, tracer: OpenTracing.global_tracer, span: -> { OpenTracing.global_tracer.active_span }
end

client.transport = Elasticsearch::Tracer::Transport.new(tracer: OpenTracing.global_tracer,
                                                        active_span: -> { OpenTracing.global_tracer.active_span },
                                                        transport: client.transport)

Configuration Options

• transport: Elasticsearch::Client.transport the original transport.
• tracer: OpenTracing::Tracer an OT compatible tracer. Default OpenTracing.global_tracer
• active_span: boolean an active span provider. Default: nil.

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-elasticsearch-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.

Code of Conduct

Everyone interacting in the Elasticsearch::Tracer project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.