Simplify ApplicationRateLimiter

Removed unused methods and declarations

app/services/concerns/rate_limited_service.rb

@@ -17,7 +17,7 @@ module RateLimitedService
     end
 
     def log_request(request, current_user)
-      rate_limiter.class.log_request(request, "#{key}_request_limit".to_sym, current_user)
+      rate_limiter.log_request(request, "#{key}_request_limit".to_sym, current_user)
     end
 
     private
@@ -26,20 +26,19 @@ module RateLimitedService
   end
 
   class RateLimiterScopedAndKeyed
-    attr_reader :key, :opts, :rate_limiter_klass
+    attr_reader :key, :opts, :rate_limiter
 
-    def initialize(key:, opts:, rate_limiter_klass:)
+    def initialize(key:, opts:, rate_limiter:)
       @key = key
       @opts = opts
-      @rate_limiter_klass = rate_limiter_klass
+      @rate_limiter = rate_limiter
     end
 
     def rate_limit!(service)
       evaluated_scope = evaluated_scope_for(service)
       return if feature_flag_disabled?(evaluated_scope[:project])
 
-      rate_limiter = new_rate_limiter(evaluated_scope)
-      if rate_limiter.throttled?
+      if rate_limiter.throttled?(key, **opts.merge(scope: evaluated_scope.values, users_allowlist: users_allowlist))
         raise RateLimitedError.new(key: key, rate_limiter: rate_limiter), _('This endpoint has been requested too many times. Try again later.')
       end
     end
@@ -59,20 +58,16 @@ module RateLimitedService
     def feature_flag_disabled?(project)
       Feature.disabled?("rate_limited_service_#{key}", project, default_enabled: :yaml)
     end
-
-    def new_rate_limiter(evaluated_scope)
-      rate_limiter_klass.new(key, **opts.merge(scope: evaluated_scope.values, users_allowlist: users_allowlist))
-    end
   end
 
   prepended do
     attr_accessor :rate_limiter_bypassed
     cattr_accessor :rate_limiter_scoped_and_keyed
 
-    def self.rate_limit(key:, opts:, rate_limiter_klass: ::Gitlab::ApplicationRateLimiter)
+    def self.rate_limit(key:, opts:, rate_limiter: ::Gitlab::ApplicationRateLimiter)
       self.rate_limiter_scoped_and_keyed = RateLimiterScopedAndKeyed.new(key: key,
                                                                          opts: opts,
-                                                                         rate_limiter_klass: rate_limiter_klass)
+                                                                         rate_limiter: rate_limiter)
     end
   end
 

lib/api/helpers/rate_limiter.rb

@@ -5,7 +5,7 @@ module API
     # == RateLimiter
     #
     # Helper that checks if the rate limit for a given endpoint is throttled by calling the
-    # Gitlab::ApplicationRateLimiter class. If the action is throttled for the current user, the request
+    # Gitlab::ApplicationRateLimiter module. If the action is throttled for the current user, the request
     # will be logged and an error message will be rendered with a Too Many Requests response status.
     # See app/controllers/concerns/check_rate_limit.rb for Rails controllers version
     module RateLimiter

lib/gitlab/application_rate_limiter.rb

 # frozen_string_literal: true
 
 module Gitlab
-  # This class implements a simple rate limiter that can be used to throttle
+  # This module 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 or API level.
   # See CheckRateLimit concern for usage.
-  class ApplicationRateLimiter
+  module ApplicationRateLimiter
     InvalidKeyError = Class.new(StandardError)
 
-    def initialize(key, **options)
-      @key = key
-      @options = options
-    end
-
-    def throttled?
-      self.class.throttled?(key, **options)
-    end
-
-    def threshold_value
-      options[:threshold] || self.class.threshold(key)
-    end
-
-    def interval_value
-      self.class.interval(key)
-    end
-
     class << self
       # Application rate limits
       #
@@ -201,9 +184,5 @@ module Gitlab
         scoped_user.username.downcase.in?(users_allowlist)
       end
     end
-
-    private
-
-    attr_reader :key, :options
   end
 end

spec/services/concerns/rate_limited_service_spec.rb

@@ -6,11 +6,10 @@ RSpec.describe RateLimitedService do
   let(:key) { :issues_create }
   let(:scope) { [:project, :current_user] }
   let(:opts) { { scope: scope, users_allowlist: -> { [User.support_bot.username] } } }
-  let(:rate_limiter_klass) { ::Gitlab::ApplicationRateLimiter }
-  let(:rate_limiter_instance) { rate_limiter_klass.new(key, **opts) }
+  let(:rate_limiter) { ::Gitlab::ApplicationRateLimiter }
 
   describe 'RateLimitedError' do
-    subject { described_class::RateLimitedError.new(key: key, rate_limiter: rate_limiter_instance) }
+    subject { described_class::RateLimitedError.new(key: key, rate_limiter: rate_limiter) }
 
     describe '#headers' do
       it 'returns a Hash of HTTP headers' do
@@ -26,7 +25,7 @@ RSpec.describe RateLimitedService do
         request = instance_double(Grape::Request)
         user = instance_double(User)
 
-        expect(rate_limiter_klass).to receive(:log_request).with(request, "#{key}_request_limit".to_sym, user)
+        expect(rate_limiter).to receive(:log_request).with(request, "#{key}_request_limit".to_sym, user)
 
         subject.log_request(request, user)
       end
@@ -34,7 +33,7 @@ RSpec.describe RateLimitedService do
   end
 
   describe 'RateLimiterScopedAndKeyed' do
-    subject { described_class::RateLimiterScopedAndKeyed.new(key: key, opts: opts, rate_limiter_klass: rate_limiter_klass) }
+    subject { described_class::RateLimiterScopedAndKeyed.new(key: key, opts: opts, rate_limiter: rate_limiter) }
 
     describe '#rate_limit!' do
       let(:project_with_feature_enabled) { create(:project) }
@@ -49,13 +48,12 @@ RSpec.describe RateLimitedService do
       let(:rate_limited_service_issues_create_feature_enabled) { nil }
 
       before do
-        allow(rate_limiter_klass).to receive(:new).with(key, **evaluated_opts).and_return(rate_limiter_instance)
         stub_feature_flags(rate_limited_service_issues_create: rate_limited_service_issues_create_feature_enabled)
       end
 
       shared_examples 'a service that does not attempt to throttle' do
         it 'does not attempt to throttle' do
-          expect(rate_limiter_instance).not_to receive(:throttled?)
+          expect(rate_limiter).not_to receive(:throttled?)
 
           expect(subject.rate_limit!(service)).to be_nil
         end
@@ -63,7 +61,7 @@ RSpec.describe RateLimitedService do
 
       shared_examples 'a service that does attempt to throttle' do
         before do
-          allow(rate_limiter_instance).to receive(:throttled?).and_return(throttled)
+          allow(rate_limiter).to receive(:throttled?).and_return(throttled)
         end
 
         context 'when rate limiting is not in effect' do
@@ -134,7 +132,7 @@ RSpec.describe RateLimitedService do
     end
 
     before do
-      allow(RateLimitedService::RateLimiterScopedAndKeyed).to receive(:new).with(key: key, opts: opts, rate_limiter_klass: rate_limiter_klass).and_return(rate_limiter_scoped_and_keyed)
+      allow(RateLimitedService::RateLimiterScopedAndKeyed).to receive(:new).with(key: key, opts: opts, rate_limiter: rate_limiter).and_return(rate_limiter_scoped_and_keyed)
     end
 
     context 'bypasses rate limiting' do
@@ -173,12 +171,12 @@ RSpec.describe RateLimitedService do
       end
 
       before do
-        allow(RateLimitedService::RateLimiterScopedAndKeyed).to receive(:new).with(key: key, opts: opts, rate_limiter_klass: rate_limiter_klass).and_return(rate_limiter_scoped_and_keyed)
+        allow(RateLimitedService::RateLimiterScopedAndKeyed).to receive(:new).with(key: key, opts: opts, rate_limiter: rate_limiter).and_return(rate_limiter_scoped_and_keyed)
       end
 
       context 'and applies rate limiting' do
         it 'raises an RateLimitedService::RateLimitedError exception' do
-          expect(rate_limiter_scoped_and_keyed).to receive(:rate_limit!).with(subject).and_raise(RateLimitedService::RateLimitedError.new(key: key, rate_limiter: rate_limiter_instance))
+          expect(rate_limiter_scoped_and_keyed).to receive(:rate_limit!).with(subject).and_raise(RateLimitedService::RateLimitedError.new(key: key, rate_limiter: rate_limiter))
 
           expect { subject.execute }.to raise_error(RateLimitedService::RateLimitedError)
         end

spec/services/issues/create_service_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe Issues::CreateService do
 
       expect(described_class.rate_limiter_scoped_and_keyed.key).to eq(:issues_create)
       expect(described_class.rate_limiter_scoped_and_keyed.opts[:scope]).to eq(%i[project current_user external_author])
-      expect(described_class.rate_limiter_scoped_and_keyed.rate_limiter_klass).to eq(Gitlab::ApplicationRateLimiter)
+      expect(described_class.rate_limiter_scoped_and_keyed.rate_limiter).to eq(Gitlab::ApplicationRateLimiter)
     end
   end