47 lines
1.4 KiB
Ruby
47 lines
1.4 KiB
Ruby
module Gitlab
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# This class implements a simple rate limiter that can be used to throttle
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# certain actions. Unlike Rack Attack and Rack::Throttle, which operate at
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# the middleware level, this can be used at the controller level.
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class ActionRateLimiter
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TIME_TO_EXPIRE = 60 # 1 min
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attr_accessor :action, :expiry_time
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def initialize(action:, expiry_time: TIME_TO_EXPIRE)
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@action = action
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@expiry_time = expiry_time
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end
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# Increments the given cache key and increments the value by 1 with the
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# given expiration time. Returns the incremented value.
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#
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# key - An array of ActiveRecord instances
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def increment(key)
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value = 0
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Gitlab::Redis::Cache.with do |redis|
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cache_key = action_key(key)
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value = redis.incr(cache_key)
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redis.expire(cache_key, expiry_time) if value == 1
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end
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value
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end
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# Increments the given key and returns true if the action should
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# be throttled.
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#
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# key - An array of ActiveRecord instances
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# threshold_value - The maximum number of times this action should occur in the given time interval
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def throttled?(key, threshold_value)
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self.increment(key) > threshold_value
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end
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private
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def action_key(key)
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serialized = key.map { |obj| "#{obj.class.model_name.to_s.underscore}:#{obj.id}" }.join(":")
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"action_rate_limiter:#{action}:#{serialized}"
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end
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end
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end
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