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# frozen_string_literal: true
module Gitlab
# Provides routines to identify the current runtime as which the application
# executes, such as whether it is an application server and which one.
module Runtime
IdentificationError = Class.new(RuntimeError)
AmbiguousProcessError = Class.new(IdentificationError)
UnknownProcessError = Class.new(IdentificationError)
AVAILABLE_RUNTIMES = [
:console,
:geo_log_cursor,
:puma,
:rails_runner,
:rake,
:sidekiq,
:test_suite
].freeze
class << self
def identify
matches = AVAILABLE_RUNTIMES.select { |runtime| public_send("#{runtime}?") } # rubocop:disable GitlabSecurity/PublicSend
if matches.one?
matches.first
elsif matches.none?
raise UnknownProcessError, "Failed to identify runtime for process #{Process.pid} (#{$PROGRAM_NAME})"
else
raise AmbiguousProcessError, "Ambiguous runtime #{matches} for process #{Process.pid} (#{$PROGRAM_NAME})"
end
end
def safe_identify
identify
rescue UnknownProcessError, AmbiguousProcessError
nil
end
def puma?
!!defined?(::Puma::Server)
end
def sidekiq?
!!(defined?(::Sidekiq) && Sidekiq.try(:server?))
end
def rake?
!!(defined?(::Rake) && Rake.application.top_level_tasks.any?)
end
def test_suite?
Rails.env.test?
end
def console?
!!defined?(::Rails::Console)
end
def geo_log_cursor?
!!defined?(::GeoLogCursorOptionParser)
end
def rails_runner?
!!defined?(::Rails::Command::RunnerCommand)
end
# Whether we are executing in an actual application context i.e. Puma or Sidekiq.
def application?
puma? || sidekiq?
end
# Whether we are executing in a multi-threaded environment. For now this is equivalent
# to meaning Puma or Sidekiq, but this could change in the future.
def multi_threaded?
application?
end
def puma_in_clustered_mode?
return unless puma?
return unless ::Puma.respond_to?(:cli_config)
::Puma.cli_config.options[:workers].to_i > 0
end
def max_threads
threads = 1 # main thread
if puma? && ::Puma.respond_to?(:cli_config)
threads += ::Puma.cli_config.options[:max_threads]
elsif sidekiq?
# 2 extra threads for the pollers in Sidekiq and Sidekiq Cron:
# https://github.com/ondrejbartas/sidekiq-cron#under-the-hood
#
# These threads execute Sidekiq client middleware when jobs
# are enqueued and those can access DB / Redis.
threads += Sidekiq[:concurrency] + 2
end
if puma?
threads += Gitlab::ActionCable::Config.worker_pool_size
end
threads
end
end
end
end
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