rails_band

Easy-to-use Rails Instrumentation API.

Installation

Add this line to your application’s Gemfile:

gem 'rails_band'

And then execute:

bundle

Or install it yourself as:

gem install rails_band

Usage

rails_band automatically replaces each LogSubscriber with its own ones after it’s loaded as a gem. And then, you
should configure how to consume Instrumentation hooks from core Rails implementations like this:

Rails.application.config.rails_band.consumers = -&gt;(event) { Rails.logger.info(event.to_h) }

You can also configure it by specifying event names:

Rails.application.config.rails_band.consumers = {
  default: -&gt;(event) { Rails.logger.info(event.to_h) },
  action_controller: -&gt;(event) { Rails.logger.info(event.slice(:name, :method, :path, :status, :controller, :action)) },
  'sql.active_record': -&gt;(event) { Rails.logger.debug("#{event.sql_name}: #{event.sql}") },
}

Note :default is the fallback of other non-specific event names. Other events will be ignored without :default. In
other words, you can consume only events that you want to really consume without :default.

rails_band does not limit you only to use logging purposes. Enjoy with Rails Instrumentation hooks!

Supported Instrumentation API hooks

These are Rails Instrumentation API hooks supported by this gem so far.

Action Controller

Event name	Supported
`write_fragment.action_controller`	✅
`read_fragment.action_controller`	✅
`expire_fragment.action_controller`	✅
`exist_fragment?.action_controller`	✅
`start_processing.action_controller`	✅
`process_action.action_controller`	✅
`send_file.action_controller`	✅
`send_stream.action_controller`	✅
`send_data.action_controller`	✅
`redirect_to.action_controller`	✅
`halted_callback.action_controller`	✅
`unpermitted_parameters.action_controller`	✅

Action Dispatch

Event name	Supported
`process_middleware.action_dispatch`	✅
`redirect.action_dispatch`	✅
`request.action_dispatch`	✅

Action View

Event name	Supported
`render_template.action_view`	✅
`render_partial.action_view`	✅
`render_collection.action_view`	✅
`render_layout.action_view`	✅

Active Record

Event name	Supported
`strict_loading_violation.active_record` (Not yet documented. See the configuration of `action_on_strict_loading_violation`)	✅
`sql.active_record`	✅
`instantiation.active_record`	✅
`transaction.active_record`

Action Mailer

Event name	Supported
`deliver.action_mailer`	✅
`process.action_mailer`	✅

Active Support — Caching

Event name	Supported
`cache_read.active_support`	✅
`cache_read_multi.active_support`	✅
`cache_generate.active_support`	✅
`cache_fetch_hit.active_support`	✅
`cache_write.active_support`	✅
`cache_write_multi.active_support`	✅
`cache_increment.active_support`	✅
`cache_decrement.active_support`	✅
`cache_delete.active_support`	✅
`cache_delete_multi.active_support`	✅
`cache_delete_matched.active_support`	✅
`cache_cleanup.active_support`	✅
`cache_prune.active_support`	✅
`cache_exist?.active_support`	✅

Active Support — Messages

Event name	Supported
`message_serializer_fallback.active_support`	✅

Active Job

Event name	Supported
`enqueue_at.active_job`	✅
`enqueue.active_job`	✅
`enqueue_retry.active_job`	✅
`perform_start.active_job`	✅
`perform.active_job`	✅
`retry_stopped.active_job`	✅
`discard.active_job`	✅
`enqueue_all.active_job`	✅

Action Cable

Event name	Supported
`perform_action.action_cable`	✅
`transmit.action_cable`	✅
`transmit_subscription_confirmation.action_cable`	✅
`transmit_subscription_rejection.action_cable`	✅
`broadcast.action_cable`	✅

Active Storage

Event name	Supported
`service_upload.active_storage`	✅
`service_streaming_download.active_storage`	✅
`service_download_chunk.active_storage`	✅
`service_download.active_storage`	✅
`service_delete.active_storage`	✅
`service_delete_prefixed.active_storage`	✅
`service_exist.active_storage`	✅
`service_url.active_storage`	✅
`service_update_metadata.active_storage`	✅
`preview.active_storage`	✅
`transform.active_storage`	✅
`analyze.active_storage`	✅

Action Mailbox

Event name	Supported
`process.action_mailbox`	✅

Railties

Event name	Supported
`load_config_initializer.railties`

Rails

Event name	Supported
`deprecation.rails`	✅

Contributing

Contributing is welcome 😄 Please open a pull request!

License

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

Modules

Classes