Class: GrapeThrottler::Middleware::ThrottleMiddleware

Inherits:
Grape::Middleware::Base
  • Object
show all
Defined in:
lib/grape-throttler/middleware/throttle_middleware.rb

Constant Summary collapse

COUNTER_START = 
0

Instance Method Summary collapse

Instance Method Details

#before ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength rubocop:disable Metrics/PerceivedComplexity, Lint/AssignmentInCondition



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# File 'lib/grape-throttler/middleware/throttle_middleware.rb', line 11

def before
  endpoint = env['api.endpoint']
  logger = options[:logger] || Logger.new($stdout)

  return unless throttle_options = endpoint.route_setting(:throttle)

  limit, period = find_limit_and_period(throttle_options)

  check_limit_and_period(limit, period)

  limit = limit.call(env) if limit.is_a?(Proc)
  return true if limit.negative?

  user_value = find_user_value(options) || "ip:#{env['REMOTE_ADDR']}"
  rate_key = generate_rate_key(endpoint, user_value)

  begin
    redis = options[:cache]
    redis.ping

    current = redis.get(rate_key).to_i

    if !current.nil? && current >= limit
      endpoint.error!('Too Many Requests', 429)
    else
      redis.multi do
        redis.set(rate_key, COUNTER_START, nx: true, ex: period.to_i)
        redis.incr(rate_key)
      end
    end
  rescue StandardError => e
    logger.warn(e.message)
  end
end