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module Gitlab
# This class implements a simple rate limiter that can be used to throttle
# certain actions. Unlike Rack Attack and Rack::Throttle, which operate at
# the middleware level, this can be used at the controller level.
class ActionRateLimiter
TIME_TO_EXPIRE = 60 # 1 min
attr_accessor :action, :expiry_time
def initialize(action:, expiry_time: TIME_TO_EXPIRE)
@action = action
@expiry_time = expiry_time
end
def increment(key)
value = 0
Gitlab::Redis::Cache.with do |redis|
cache_key = "action_rate_limiter:#{action}:#{key}"
value = redis.incr(cache_key)
redis.expire(cache_key, expiry_time) if value == 1
end
value
end
def throttled?(key, threshold_value)
self.increment(key) > threshold_value
end
end
end
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