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# frozen_string_literal: true
module Gitlab
module Database
module Migrations
class Instrumentation
STATS_FILENAME = 'migration-stats.json'
def initialize(result_dir:, observer_classes: ::Gitlab::Database::Migrations::Observers.all_observers)
@observer_classes = observer_classes
@result_dir = result_dir
end
def observe(version:, name:, connection:, &block)
observation = Observation.new(version: version, name: name, success: false)
per_migration_result_dir = File.join(@result_dir, name)
FileUtils.mkdir_p(per_migration_result_dir)
observers = observer_classes.map { |c| c.new(observation, per_migration_result_dir, connection) }
on_each_observer(observers) { |observer| observer.before }
start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
yield
observation.success = true
observation
ensure
observation.walltime = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
on_each_observer(observers) { |observer| observer.after }
on_each_observer(observers) { |observer| observer.record }
record_observation(observation, destination_dir: per_migration_result_dir)
end
private
attr_reader :observer_classes
def record_observation(observation, destination_dir:)
stats_file_location = File.join(destination_dir, STATS_FILENAME)
File.write(stats_file_location, observation.to_json)
end
def on_each_observer(observers, &block)
observers.each do |observer|
yield observer
rescue StandardError => e
Gitlab::AppLogger.error("Migration observer #{observer.class} failed with: #{e}")
end
end
end
end
end
end
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