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# frozen_string_literal: true
module Labkit
module Tracing
module Rails
module ActiveRecord
# ActiveRecord bridges active record notifications to
# the distributed tracing subsystem
class Subscriber
include Labkit::Tracing::TracingCommon
ACTIVE_RECORD_NOTIFICATION_TOPIC = "sql.active_record"
# Instruments Rails ActiveRecord events for opentracing.
# Returns a lambda, which, when called will unsubscribe from the notifications
def self.instrument
subscription = ::ActiveSupport::Notifications.subscribe(ACTIVE_RECORD_NOTIFICATION_TOPIC, SqlInstrumenter.new)
create_unsubscriber [subscription]
end
end
end
end
end
end
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