66 lines
2.1 KiB
Ruby
66 lines
2.1 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Database
|
|
module Transaction
|
|
class Observer
|
|
INSTRUMENTED_STATEMENTS = %w[BEGIN SAVEPOINT ROLLBACK RELEASE].freeze
|
|
LONGEST_COMMAND_LENGTH = 'ROLLBACK TO SAVEPOINT'.length
|
|
START_COMMENT = '/*'
|
|
END_COMMENT = '*/'
|
|
|
|
def self.instrument_transactions(cmd, event)
|
|
connection = event.payload[:connection]
|
|
manager = connection&.transaction_manager
|
|
return unless manager.respond_to?(:transaction_context)
|
|
|
|
context = manager.transaction_context
|
|
return if context.nil?
|
|
|
|
if cmd.start_with?('BEGIN')
|
|
context.set_start_time
|
|
context.set_depth(0)
|
|
context.track_sql(event.payload[:sql])
|
|
elsif cmd.start_with?('SAVEPOINT ')
|
|
context.set_depth(manager.open_transactions)
|
|
context.increment_savepoints
|
|
elsif cmd.start_with?('ROLLBACK TO SAVEPOINT')
|
|
context.increment_rollbacks
|
|
elsif cmd.start_with?('RELEASE SAVEPOINT ')
|
|
context.increment_releases
|
|
end
|
|
end
|
|
|
|
def self.register!
|
|
ActiveSupport::Notifications.subscribe('sql.active_record') do |event|
|
|
sql = event.payload.dig(:sql).to_s
|
|
cmd = extract_sql_command(sql)
|
|
|
|
if cmd.start_with?(*INSTRUMENTED_STATEMENTS)
|
|
self.instrument_transactions(cmd, event)
|
|
end
|
|
end
|
|
end
|
|
|
|
def self.extract_sql_command(sql)
|
|
return sql unless sql.start_with?(START_COMMENT)
|
|
|
|
index = sql.index(END_COMMENT)
|
|
|
|
return sql unless index
|
|
|
|
# /* comment */ SELECT
|
|
#
|
|
# We offset using a position of the end comment + 1 character to
|
|
# accomodate a space between Marginalia comment and a SQL statement.
|
|
offset = index + END_COMMENT.length + 1
|
|
|
|
# Avoid duplicating the entire string. This isn't optimized to
|
|
# strip extra spaces, but we assume that this doesn't happen
|
|
# for performance reasons.
|
|
sql[offset..offset + LONGEST_COMMAND_LENGTH]
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|