Module: WithRateLimit

Defined in:
lib/with_rate_limit.rb,
lib/with_rate_limit/cache.rb,
lib/with_rate_limit/version.rb,
lib/with_rate_limit/strategy.rb,
lib/with_rate_limit/cache/redis.rb,
lib/with_rate_limit/cache/memory.rb,
lib/with_rate_limit/strategy/sleep.rb,
lib/with_rate_limit/limit_exceeded_error.rb,
lib/with_rate_limit/strategy/raise_error.rb

Defined Under Namespace

Classes: Cache, LimitExceededError, Strategy

Constant Summary collapse

VERSION = 
"0.1.0"

Instance Method Summary collapse

Instance Method Details

#with_rate_limit(interval, limit, options = {}, &block) ⇒ Object 



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# File 'lib/with_rate_limit.rb', line 12

def with_rate_limit(interval, limit, options = {}, &block)
  options = default_options(interval, limit).merge(options.transform_keys &:to_sym)
  validate_options(options)
  
  strategy = options[:strategy]
  cache_key = options[:cache_key]
  cache = options[:cache]
  cache_data = cache.get(cache_key).transform_keys(&:to_sym)
  
  last_interval_started_at = cache_data[:last_interval_started_at] || current_timestamp
  operations_count = cache_data[:operations_count].to_i
  timestamp = current_timestamp
  count_reset_delta = timestamp - last_interval_started_at
  interval = interval * 1000

  if (count_reset_delta < interval) && operations_count >= limit
    strategy.execute((interval - count_reset_delta) / 1000.0)
    return with_rate_limit(interval / 1000, limit, options, &block)
  elsif count_reset_delta > interval
    cache.set(cache_key, {last_interval_started_at: timestamp, operations_count: 1})
  else
    cache.set(cache_key, {last_interval_started_at: timestamp, operations_count: operations_count + 1})
  end

  begin
    yield
  rescue StandardError => e
    raise e
  end
end