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# frozen_string_literal: true
module Gitlab
module HealthChecks
# This check can only be run on Unicorn `master` process
class UnicornCheck
extend SimpleAbstractCheck
class << self
include Gitlab::Utils::StrongMemoize
private
def metric_prefix
'unicorn_check'
end
def successful?(result)
result > 0
end
def check
return unless http_servers
http_servers.sum(&:worker_processes) # rubocop: disable CodeReuse/ActiveRecord
end
# Traversal of ObjectSpace is expensive, on fully loaded application
# it takes around 80ms. The instances of HttpServers are not a subject
# to change so we can cache the list of servers.
def http_servers
strong_memoize(:http_servers) do
next unless Gitlab::Runtime.unicorn?
ObjectSpace.each_object(::Unicorn::HttpServer).to_a
end
end
end
end
end
end
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