Knowing how well your API performs in real time is essential to any successful project. That’s because you can’t fix what you can’t measure.
It’s time to improve the reporting implementation and address performance monitoring in both development and production environments. Here’s what a single API request breakdown is going to look like.
The first step is to add the
newrelic_rpm gem to Gemfile, which implements the actual realtime performance reporting to NewRelic. We also use Mongoid and the Moped MongoDB Ruby driver, which can be instrumented with
You will need
config/newrelic.yml in your application. Ours can be found in this gist and works well both locally and on Heroku.
In the past we used NewRelic::Agent::Instrumentation::API, which works for any generic Rack middleware. This would report all API calls to NewRelic, but would treat requests to /api/artist/andy-warhol and /api/artist/wassily-kandinsky as unrelated. That is because the instrumenter is a Rack middleware that wraps Grape requests before they reach Grape. The only information available is the request URL, and not the actual API route that is going to be matched when the request is processed.
We want both requests to /api/artist/andy-warhol and /api/artist/wassily-kandinsky to be treated as /api/artist/:id. Lets insert a middleware inside Grape itself, once the URL has been matched to a route.
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The new instrumenter has access to the current API endpoint via
env['api.endpoint'] and reports data via NewRelic’s
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The complete code for
ApiNewRelicInstrumenter can be found in this gist. It supports enabling and disabling performance reporting by setting
NEW_RELIC_ID and works around NewRelic’s method name limitations (these cannot contain slashes).
You can now see NewRelic performance data in development mode, too. If you mount Grape inside Rails run
NEW_RELIC_ID=foo rails s. Navigate to http://localhost:3000/newrelic to see your local traces.
Drill into an individual request to find several detailed breakdowns of how time was spent, including specific MongoDB queries (under “SQL”, naturally).
NewRelic is a commercial product, but you can run development mode for free! Note that enabling this will triple your local Rails boot time: we enable development mode by setting
development_mode: <%= !!ENV['NEW_RELIC_ID'] %> in newrelic.rpm.