130 lines
4.8 KiB
Ruby
130 lines
4.8 KiB
Ruby
# frozen_string_literal: true
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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 or API level.
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#
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# @example
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# if Gitlab::ApplicationRateLimiter.throttled?(:project_export, scope: [@project, @current_user])
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# flash[:alert] = 'error!'
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# redirect_to(edit_project_path(@project), status: :too_many_requests)
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# end
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class ApplicationRateLimiter
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class << self
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# Application rate limits
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#
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# Threshold value can be either an Integer or a Proc
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# in order to not evaluate it's value every time this method is called
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# and only do that when it's needed.
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def rate_limits
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{
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project_export: { threshold: 1, interval: 5.minutes },
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project_download_export: { threshold: 10, interval: 10.minutes },
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project_generate_new_export: { threshold: 1, interval: 5.minutes },
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project_import: { threshold: 30, interval: 10.minutes },
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play_pipeline_schedule: { threshold: 1, interval: 1.minute },
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show_raw_controller: { threshold: -> { Gitlab::CurrentSettings.current_application_settings.raw_blob_request_limit }, interval: 1.minute }
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}.freeze
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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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# @param key [Symbol] Key attribute registered in `.rate_limits`
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# @option scope [Array<ActiveRecord>] Array of ActiveRecord models to scope throttling to a specific request (e.g. per user per project)
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# @option threshold [Integer] Optional threshold value to override default one registered in `.rate_limits`
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# @option interval [Integer] Optional interval value to override default one registered in `.rate_limits`
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#
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# @return [Boolean] Whether or not a request should be throttled
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def throttled?(key, scope: nil, interval: nil, threshold: nil)
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return unless rate_limits[key]
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threshold_value = threshold || threshold(key)
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threshold_value > 0 &&
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increment(key, scope, interval) > threshold_value
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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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# expiration interval defined in `.rate_limits`.
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#
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# @param key [Symbol] Key attribute registered in `.rate_limits`
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# @option scope [Array<ActiveRecord>] Array of ActiveRecord models to scope throttling to a specific request (e.g. per user per project)
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# @option interval [Integer] Optional interval value to override default one registered in `.rate_limits`
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#
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# @return [Integer] incremented value
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def increment(key, scope, interval = nil)
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value = 0
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interval_value = interval || interval(key)
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Gitlab::Redis::Cache.with do |redis|
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cache_key = action_key(key, scope)
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value = redis.incr(cache_key)
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redis.expire(cache_key, interval_value) if value == 1
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end
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value
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end
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# Logs request using provided logger
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#
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# @param request [Http::Request] - Web request to be logged
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# @param type [Symbol] A symbol key that represents the request
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# @param current_user [User] Current user of the request, it can be nil
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# @param logger [Logger] Logger to log request to a specific log file. Defaults to Gitlab::AuthLogger
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def log_request(request, type, current_user, logger = Gitlab::AuthLogger)
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request_information = {
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message: 'Application_Rate_Limiter_Request',
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env: type,
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remote_ip: request.ip,
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request_method: request.request_method,
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path: request.fullpath
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}
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if current_user
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request_information.merge!({
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user_id: current_user.id,
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username: current_user.username
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})
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end
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logger.error(request_information)
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end
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private
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def threshold(key)
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value = rate_limit_value_by_key(key, :threshold)
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return value.call if value.is_a?(Proc)
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value.to_i
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end
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def interval(key)
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rate_limit_value_by_key(key, :interval).to_i
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end
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def rate_limit_value_by_key(key, setting)
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action = rate_limits[key]
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action[setting] if action
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end
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def action_key(key, scope)
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composed_key = [key, scope].flatten.compact
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serialized = composed_key.map do |obj|
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if obj.is_a?(String) || obj.is_a?(Symbol)
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"#{obj}"
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else
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"#{obj.class.model_name.to_s.underscore}:#{obj.id}"
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end
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end.join(":")
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"application_rate_limiter:#{serialized}"
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end
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end
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end
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end
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