Built-in metrics for external services HTTP calls! This gem is a Part of the yabeda suite.

Read introduction article on dev.to.

Metrics

Works as the Puma plugin and provides following metrics:

• http_request_total - the number of external HTTP request attempts (by host, port, method)
• http_response_total - the number of made external HTTP requeusts (by host, port, method, status)
• http_response_duration - the histogram of response duration (by host, port, method, status)

Installation

Add this line to your application's Gemfile:

gem 'yabeda-http_requests'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install yabeda-http_requests

Usage

After plugin the gem, you just have to set up metrics exporting with yabeda-prometheus gem.

The metrics page will look like this:

# TYPE http_requests_total_count counter
# HELP http_requests_total_count A counter of the total number of external HTTP requests.
http_request_total{host="twitter.com",port="443",method="GET",query="/dsalahutdinov1"} 149.0
http_request_total{host="dev.to",port="443",method="GET",query="/amplifr"} 145.0
...

To simple set up Grafana, try the sample dashboard.

Sample application

Sample application aims to show how Ruby web-application, this gem and Prometheus/Grafana work togather. Get into example directory and run docker compose:

$ cd example
$ docker-compose up

After docker image builds and all the services get up, you can browse application endpoints:

• Ruby web-application runs on http://localhost:9292/. Everytime you request page, it schedules random web-scrapping job into sidekiq.
• Sidekiq exposes prometheus metrics on http://localhost:9394/metrics. This endpoint is scrapped by prometheus exporter every 5 seconds.
• Grafana runs on http://localhost:3000/. Use admin/foobar as login and password to get in. Grafana already has specific dashboard with data visualisation.

Follow the yabeda-external-http-requests dashboard in Grafana. Finally, after a couple of minutes when data collected you will see the following:

Development with Docker

Get local development environment working and tests running is very easy with docker-compose:

docker-compose run app bundle
docker-compose run app bundle exec rspec

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/yabeda-rb/yabeda-http_requests.

Releasing

1. Bump version number in lib/yabeda/http_requests/version.rb

   In case of pre-releases keep in mind rubygems/rubygems#3086 and check version with command like Gem::Version.new(Yabeda::VERSION).to_s

2. Fill CHANGELOG.md with missing changes, add header with version and date.

3. Make a commit:

   git add lib/yabeda/http_requests/version.rb CHANGELOG.md
   version=$(ruby -r ./lib/yabeda/http_requests/version.rb -e "puts Gem::Version.new(Yabeda::HttpRequests::VERSION)")
   git commit --message="${version}: " --edit

4. Create annotated tag:

   git tag v${version} --annotate --message="${version}: " --edit --sign

5. Fill version name into subject line and (optionally) some description (list of changes will be taken from changelog and appended automatically)

6. Push it:

   git push --follow-tags

7. GitHub Actions will create a new release, build and push gem into RubyGems! You're done!

License

The gem is available as open source under the terms of the MIT License.