require 'logger'

module Sidekiq
  ##
  # This module is part of Sidekiq core and not intended for extensions.
  #
  module Util

    def self.logger
      @logger ||= begin
        log = Logger.new(STDERR)
        log.level = Logger::INFO
        log
      end
    end

    def self.logger=(log)
      @logger = (log ? log : Logger.new('/dev/null'))
    end

    def constantize(camel_cased_word)
      names = camel_cased_word.split('::')
      names.shift if names.empty? || names.first.empty?

      constant = Object
      names.each do |name|
        constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
      end
      constant
    end

    def watchdog(last_words)
      yield
    rescue => ex
      logger.error last_words
      logger.error ex
      logger.error ex.backtrace.join("\n")
    end

    def logger
      Sidekiq::Util.logger
    end

    def redis
      Sidekiq.redis
    end

    def process_id
      Sidekiq::Util.process_id
    end

    def self.process_id
      @pid ||= begin
        if Process.pid == 1
          # Heroku does not expose pids.
          require 'securerandom'
          (SecureRandom.random_number * 4_000_000_000).floor.to_s(16)
        else
          Process.pid
        end
      end
    end
  end
end