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# frozen_string_literal: true
module Gitlab
module Metrics
module Subscribers
# Class for tracking the total query duration of a transaction.
class ActiveRecord < ActiveSupport::Subscriber
include Gitlab::Metrics::Methods
attach_to :active_record
IGNORABLE_SQL = %w{BEGIN COMMIT}.freeze
DB_COUNTERS = %i{db_count db_write_count db_cached_count}.freeze
def sql(event)
return unless current_transaction
payload = event.payload
return if payload[:name] == 'SCHEMA' || IGNORABLE_SQL.include?(payload[:sql])
self.class.gitlab_sql_duration_seconds.observe(current_transaction.labels, event.duration / 1000.0)
increment_db_counters(payload)
end
private
define_histogram :gitlab_sql_duration_seconds do
docstring 'SQL time'
base_labels Transaction::BASE_LABELS
buckets [0.01, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0]
end
def select_sql_command?(payload)
payload[:sql].match(/\A((?!(.*[^\w'"](DELETE|UPDATE|INSERT INTO)[^\w'"])))(WITH.*)?(SELECT)((?!(FOR UPDATE|FOR SHARE)).)*$/i)
end
def increment_db_counters(payload)
current_transaction.increment(:db_count, 1)
if payload.fetch(:cached, payload[:name] == 'CACHE')
current_transaction.increment(:db_cached_count, 1)
end
current_transaction.increment(:db_write_count, 1) unless select_sql_command?(payload)
end
def current_transaction
Transaction.current
end
end
end
end
end
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