Class: Chronos::Rails::NotificationsSubscriber

Inherits:
Object
  • Object
show all
Defined in:
lib/chronos/rails/notifications_subscriber.rb

Overview

Converts public ActiveSupport notifications into bounded Chronos telemetry.

Examples:

Chronos::Rails::NotificationsSubscriber.new.install

Constant Summary collapse

EVENTS =

rubocop:disable Metrics/ClassLength

%w(
  process_action.action_controller render_template.action_view sql.active_record
  deliver.action_mailer perform.active_job cache_read.active_support
  cache_write.active_support cache_fetch_hit.active_support
).freeze

Class Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(notifier = Chronos, notifications = nil, options = {}) ⇒ NotificationsSubscriber

Returns a new instance of NotificationsSubscriber.



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# File 'lib/chronos/rails/notifications_subscriber.rb', line 29

def initialize(notifier = Chronos, notifications = nil, options = {})
  @notifier = notifier
  @notifications = notifications || active_support_notifications
  @sql_normalizer = Core::SqlNormalizer.new
  @query_analyzer = options[:query_analyzer] || Core::SqlQueryAnalyzer.new
  @query_inspector = options[:query_inspector] || default_query_inspector
  @query_inspection_mutex = Mutex.new
  @query_inspections = {}
  @query_analyses = {}
  @clock = options[:clock] || proc { Process.clock_gettime(Process::CLOCK_MONOTONIC) }
  @transaction_mutex = Mutex.new
  @transactions = {}
  cache_options = notifier.respond_to?(:cache_integration_options) ? notifier.cache_integration_options : {}
  @cache_normalizer = Core::CacheNormalizer.new(
    cache_options[:project_id].to_s, cache_options[:key_mode] || :none
  )
end

Class Attribute Details

.installed_buses ⇒ Object (readonly)

Returns the value of attribute installed_buses.



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# File 'lib/chronos/rails/notifications_subscriber.rb', line 26

def installed_buses
  @installed_buses
end

.mutex ⇒ Object (readonly)

Returns the value of attribute mutex.



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# File 'lib/chronos/rails/notifications_subscriber.rb', line 26

def mutex
  @mutex
end

Instance Method Details

#handle(name, arguments) ⇒ Object 



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# File 'lib/chronos/rails/notifications_subscriber.rb', line 61

def handle(name, arguments)
  event = notification_event(name, arguments)
  dispatch(name, event[:payload], event[:duration_ms])
rescue StandardError
  false
end

#install ⇒ Object 



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# File 'lib/chronos/rails/notifications_subscriber.rb', line 47

def install
  return false unless @notifications && @notifications.respond_to?(:subscribe)

  self.class.mutex.synchronize do
    return false if self.class.installed_buses[@notifications.object_id]

    event_names.each { |name| subscribe(name) }
    self.class.installed_buses[@notifications.object_id] = true
  end
  true
rescue StandardError
  false
end