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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
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)
# Mark this thread as requiring a database connection. This is used
# by the Gitlab::Metrics::Samplers::ThreadsSampler to count threads
# using a connection.
Thread.current[:uses_db_connection] = true
return unless current_transaction
payload = event.payload
return if payload[:name] == 'SCHEMA' || IGNORABLE_SQL.include?(payload[:sql])
current_transaction.observe(:gitlab_sql_duration_seconds, event.duration / 1000.0) do
buckets [0.05, 0.1, 0.25]
end
increment_db_counters(payload)
end
def self.db_counter_payload
return {} unless Gitlab::SafeRequestStore.active?
DB_COUNTERS.map do |counter|
[counter, Gitlab::SafeRequestStore[counter].to_i]
end.to_h
end
private
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)
increment(:db_count)
if payload.fetch(:cached, payload[:name] == 'CACHE')
increment(:db_cached_count)
end
increment(:db_write_count) unless select_sql_command?(payload)
end
def increment(counter)
current_transaction.increment("gitlab_transaction_#{counter}_total".to_sym, 1)
if Gitlab::SafeRequestStore.active?
Gitlab::SafeRequestStore[counter] = Gitlab::SafeRequestStore[counter].to_i + 1
end
end
def current_transaction
Transaction.current
end
end
end
end
end
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