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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
SQL_COMMANDS_WITH_COMMENTS_REGEX = /\A(\/\*.*\*\/\s)?((?!(.*[^\w'"](DELETE|UPDATE|INSERT INTO)[^\w'"])))(WITH.*)?(SELECT)((?!(FOR UPDATE|FOR SHARE)).)*$/i.freeze
SQL_DURATION_BUCKET = [0.05, 0.1, 0.25].freeze
TRANSACTION_DURATION_BUCKET = [0.1, 0.25, 1].freeze
# This event is published from ActiveRecordBaseTransactionMetrics and
# used to record a database transaction duration when calling
# ActiveRecord::Base.transaction {} block.
def transaction(event)
observe(:gitlab_database_transaction_seconds, event) do
buckets TRANSACTION_DURATION_BUCKET
end
end
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
payload = event.payload
return if ignored_query?(payload)
increment(:db_count)
increment(:db_cached_count) if cached_query?(payload)
increment(:db_write_count) unless select_sql_command?(payload)
observe(:gitlab_sql_duration_seconds, event) do
buckets SQL_DURATION_BUCKET
end
end
def self.db_counter_payload
return {} unless Gitlab::SafeRequestStore.active?
payload = {}
DB_COUNTERS.each do |counter|
payload[counter] = Gitlab::SafeRequestStore[counter].to_i
end
payload
end
def self.known_payload_keys
DB_COUNTERS
end
private
def ignored_query?(payload)
payload[:name] == 'SCHEMA' || IGNORABLE_SQL.include?(payload[:sql])
end
def cached_query?(payload)
payload.fetch(:cached, payload[:name] == 'CACHE')
end
def select_sql_command?(payload)
payload[:sql].match(SQL_COMMANDS_WITH_COMMENTS_REGEX)
end
def increment(counter)
current_transaction&.increment("gitlab_transaction_#{counter}_total".to_sym, 1)
Gitlab::SafeRequestStore[counter] = Gitlab::SafeRequestStore[counter].to_i + 1
end
def observe(histogram, event, &block)
current_transaction&.observe(histogram, event.duration / 1000.0, &block)
end
def current_transaction
::Gitlab::Metrics::WebTransaction.current || ::Gitlab::Metrics::BackgroundTransaction.current
end
end
end
end
end
Gitlab::Metrics::Subscribers::ActiveRecord.prepend_mod_with('Gitlab::Metrics::Subscribers::ActiveRecord')
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