Class: Rack::AI::Features::RateLimiter

Inherits:
Object
  • Object
show all
Defined in:
lib/rack/ai/features/rate_limiter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ RateLimiter

Returns a new instance of RateLimiter.



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# File 'lib/rack/ai/features/rate_limiter.rb', line 11

def initialize(config)
  @name = :rate_limiter
  @config = config
  @cache = {}
  @cleanup_interval = 300 # 5 minutes
  @last_cleanup = Time.now
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/rack/ai/features/rate_limiter.rb', line 9

def config
  @config
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/rack/ai/features/rate_limiter.rb', line 9

def name
  @name
end

Instance Method Details

#enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rack/ai/features/rate_limiter.rb', line 19

def enabled?
  @config.feature_enabled?(:rate_limiter)
end

#process_request(env) ⇒ Object 



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# File 'lib/rack/ai/features/rate_limiter.rb', line 27

def process_request(env)
  return { processed: false, reason: "disabled" } unless enabled?

  client_id = extract_client_id(env)
  current_time = Time.now
  
  cleanup_expired_entries if should_cleanup?
  
  # Get or initialize client data
  client_data = @cache[client_id] ||= {
    requests: [],
    blocked_until: nil
  }

  # Check if client is currently blocked
  if client_data[:blocked_until] && current_time < client_data[:blocked_until]
    return {
      processed: true,
      action: :block,
      reason: "rate_limited",
      blocked_until: client_data[:blocked_until],
      feature: @name,
      timestamp: current_time.iso8601
    }
  end

  # Clean old requests
  window_start = current_time - rate_limit_window
  client_data[:requests].reject! { |req_time| req_time < window_start }

  # Check rate limit
  if client_data[:requests].size >= max_requests_per_window
    # Block client for penalty duration
    client_data[:blocked_until] = current_time + penalty_duration
    
    return {
      processed: true,
      action: :block,
      reason: "rate_limit_exceeded",
      requests_count: client_data[:requests].size,
      blocked_until: client_data[:blocked_until],
      feature: @name,
      timestamp: current_time.iso8601
    }
  end

  # Record this request
  client_data[:requests] << current_time

  {
    processed: true,
    action: :allow,
    requests_count: client_data[:requests].size,
    remaining_requests: max_requests_per_window - client_data[:requests].size,
    feature: @name,
    timestamp: current_time.iso8601
  }
end

#process_response? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rack/ai/features/rate_limiter.rb', line 23

def process_response?
  false
end