Fix single Redis connection being used across all threads (#18135)

* Fix single Redis connection being used across all Sidekiq threads

* Fix tests

app/controllers/admin/dashboard_controller.rb

@@ -2,6 +2,8 @@
 
 module Admin
   class DashboardController < BaseController
+    include Redisable
+
     def index
       @system_checks         = Admin::SystemCheck.perform
       @time_period           = (29.days.ago.to_date...Time.now.utc.to_date)
@@ -15,10 +17,10 @@ module Admin
 
     def redis_info
       @redis_info ||= begin
-        if Redis.current.is_a?(Redis::Namespace)
+        if redis.is_a?(Redis::Namespace)
-          Redis.current.redis.info
+          redis.redis.info
         else
-          Redis.current.info
+          redis.info
         end
       end
     end

app/controllers/media_proxy_controller.rb

@@ -3,6 +3,7 @@
 class MediaProxyController < ApplicationController
   include RoutingHelper
   include Authorization
+  include Redisable
 
   skip_before_action :store_current_location
   skip_before_action :require_functional!
@@ -45,7 +46,7 @@ class MediaProxyController < ApplicationController
   end
 
   def lock_options
-    { redis: Redis.current, key: "media_download:#{params[:id]}", autorelease: 15.minutes.seconds }
+    { redis: redis, key: "media_download:#{params[:id]}", autorelease: 15.minutes.seconds }
   end
 
   def reject_media?

app/controllers/settings/exports_controller.rb

@@ -2,6 +2,7 @@
 
 class Settings::ExportsController < Settings::BaseController
   include Authorization
+  include Redisable
 
   skip_before_action :require_functional!
 
@@ -28,6 +29,6 @@ class Settings::ExportsController < Settings::BaseController
   end
 
   def lock_options
-    { redis: Redis.current, key: "backup:#{current_user.id}" }
+    { redis: redis, key: "backup:#{current_user.id}" }
   end
 end

app/lib/access_token_extension.rb

@@ -4,6 +4,8 @@ module AccessTokenExtension
   extend ActiveSupport::Concern
 
   included do
+    include Redisable
+
     after_commit :push_to_streaming_api
   end
 
@@ -16,6 +18,6 @@ module AccessTokenExtension
   end
 
   def push_to_streaming_api
-    Redis.current.publish("timeline:access_token:#{id}", Oj.dump(event: :kill)) if revoked? || destroyed?
+    redis.publish("timeline:access_token:#{id}", Oj.dump(event: :kill)) if revoked? || destroyed?
   end
 end

app/lib/activitypub/activity.rb

@@ -164,7 +164,7 @@ class ActivityPub::Activity
   end
 
   def lock_or_fail(key, expire_after = 15.minutes.seconds)
-    RedisLock.acquire({ redis: Redis.current, key: key, autorelease: expire_after }) do |lock|
+    RedisLock.acquire({ redis: redis, key: key, autorelease: expire_after }) do |lock|
       if lock.acquired?
         yield
       else

app/lib/delivery_failure_tracker.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class DeliveryFailureTracker
+  include Redisable
+
   FAILURE_DAYS_THRESHOLD = 7
 
   def initialize(url_or_host)
@@ -8,21 +10,21 @@ class DeliveryFailureTracker
   end
 
   def track_failure!
-    Redis.current.sadd(exhausted_deliveries_key, today)
+    redis.sadd(exhausted_deliveries_key, today)
     UnavailableDomain.create(domain: @host) if reached_failure_threshold?
   end
 
   def track_success!
-    Redis.current.del(exhausted_deliveries_key)
+    redis.del(exhausted_deliveries_key)
     UnavailableDomain.find_by(domain: @host)&.destroy
   end
 
   def clear_failures!
-    Redis.current.del(exhausted_deliveries_key)
+    redis.del(exhausted_deliveries_key)
   end
 
   def days
-    Redis.current.scard(exhausted_deliveries_key) || 0
+    redis.scard(exhausted_deliveries_key) || 0
   end
 
   def available?
@@ -30,12 +32,14 @@ class DeliveryFailureTracker
   end
 
   def exhausted_deliveries_days
-    @exhausted_deliveries_days ||= Redis.current.smembers(exhausted_deliveries_key).sort.map { |date| Date.new(date.slice(0, 4).to_i, date.slice(4, 2).to_i, date.slice(6, 2).to_i) }
+    @exhausted_deliveries_days ||= redis.smembers(exhausted_deliveries_key).sort.map { |date| Date.new(date.slice(0, 4).to_i, date.slice(4, 2).to_i, date.slice(6, 2).to_i) }
   end
 
   alias reset! track_success!
 
   class << self
+    include Redisable
+
     def without_unavailable(urls)
       unavailable_domains_map = Rails.cache.fetch('unavailable_domains') { UnavailableDomain.pluck(:domain).index_with(true) }
 
@@ -54,7 +58,7 @@ class DeliveryFailureTracker
     end
 
     def warning_domains
-      domains = Redis.current.keys(exhausted_deliveries_key_by('*')).map do |key|
+      domains = redis.keys(exhausted_deliveries_key_by('*')).map do |key|
         key.delete_prefix(exhausted_deliveries_key_by(''))
       end
 
@@ -62,7 +66,7 @@ class DeliveryFailureTracker
     end
 
     def warning_domains_map
-      warning_domains.index_with { |domain| Redis.current.scard(exhausted_deliveries_key_by(domain)) }
+      warning_domains.index_with { |domain| redis.scard(exhausted_deliveries_key_by(domain)) }
     end
 
     private

app/lib/redis_configuration.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+class RedisConfiguration
+  class << self
+    def with
+      pool.with { |redis| yield redis }
+    end
+
+    def pool
+      @pool ||= ConnectionPool.new(size: pool_size) { new.connection }
+    end
+
+    def pool_size
+      if Sidekiq.server?
+        Sidekiq.options[:concurrency]
+      else
+        ENV['MAX_THREADS'] || 5
+      end
+    end
+  end
+
+  def connection
+    if namespace?
+      Redis::Namespace.new(namespace, redis: raw_connection)
+    else
+      raw_connection
+    end
+  end
+
+  def namespace?
+    namespace.present?
+  end
+
+  def namespace
+    ENV.fetch('REDIS_NAMESPACE', nil)
+  end
+
+  def url
+    ENV['REDIS_URL']
+  end
+
+  private
+
+  def raw_connection
+    Redis.new(url: url, driver: :hiredis)
+  end
+end

app/models/account_conversation.rb

@@ -14,6 +14,8 @@
 #
 
 class AccountConversation < ApplicationRecord
+  include Redisable
+
   after_commit :push_to_streaming_api
 
   belongs_to :account
@@ -109,7 +111,7 @@ class AccountConversation < ApplicationRecord
   end
 
   def subscribed_to_timeline?
-    Redis.current.exists?("subscribed:#{streaming_channel}")
+    redis.exists?("subscribed:#{streaming_channel}")
   end
 
   def streaming_channel

app/models/account_suggestions/global_source.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class AccountSuggestions::GlobalSource < AccountSuggestions::Source
+  include Redisable
+
   def key
     :global
   end
@@ -28,7 +30,7 @@ class AccountSuggestions::GlobalSource < AccountSuggestions::Source
   end
 
   def account_ids_for_locale(locale)
-    Redis.current.zrevrange("follow_recommendations:#{locale}", 0, -1).map(&:to_i)
+    redis.zrevrange("follow_recommendations:#{locale}", 0, -1).map(&:to_i)
   end
 
   def to_ordered_list_key(account)

app/models/concerns/redisable.rb

@@ -6,6 +6,6 @@ module Redisable
   private
 
   def redis
-    Redis.current
+    Thread.current[:redis] ||= RedisConfiguration.new.connection
   end
 end

app/models/custom_filter.rb

@@ -24,6 +24,7 @@ class CustomFilter < ApplicationRecord
   ).freeze
 
   include Expireable
+  include Redisable
 
   belongs_to :account
 
@@ -51,7 +52,7 @@ class CustomFilter < ApplicationRecord
 
   def remove_cache
     Rails.cache.delete("filters:#{account_id}")
-    Redis.current.publish("timeline:#{account_id}", Oj.dump(event: :filters_changed))
+    redis.publish("timeline:#{account_id}", Oj.dump(event: :filters_changed))
   end
 
   def context_must_be_valid

app/models/encrypted_message.rb

@@ -19,6 +19,7 @@ class EncryptedMessage < ApplicationRecord
   self.inheritance_column = nil
 
   include Paginable
+  include Redisable
 
   scope :up_to, ->(id) { where(arel_table[:id].lteq(id)) }
 
@@ -38,7 +39,7 @@ class EncryptedMessage < ApplicationRecord
   end
 
   def subscribed_to_timeline?
-    Redis.current.exists?("subscribed:#{streaming_channel}")
+    redis.exists?("subscribed:#{streaming_channel}")
   end
 
   def streaming_channel

app/models/follow_recommendation_filter.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class FollowRecommendationFilter
+  include Redisable
+
   KEYS = %i(
     language
     status
@@ -17,7 +19,7 @@ class FollowRecommendationFilter
     if params['status'] == 'suppressed'
       Account.joins(:follow_recommendation_suppression).order(FollowRecommendationSuppression.arel_table[:id].desc).to_a
     else
-      account_ids = Redis.current.zrevrange("follow_recommendations:#{@language}", 0, -1).map(&:to_i)
+      account_ids = redis.zrevrange("follow_recommendations:#{@language}", 0, -1).map(&:to_i)
       accounts    = Account.where(id: account_ids).index_by(&:id)
 
       account_ids.map { |id| accounts[id] }.compact

app/models/user.rb

@@ -52,6 +52,7 @@ class User < ApplicationRecord
 
   include Settings::Extend
   include UserRoles
+  include Redisable
 
   # The home and list feeds will be stored in Redis for this amount
   # of time, and status fan-out to followers will include only people
@@ -456,7 +457,7 @@ class User < ApplicationRecord
   end
 
   def regenerate_feed!
-    RegenerationWorker.perform_async(account_id) if Redis.current.set("account:#{account_id}:regeneration", true, nx: true, ex: 1.day.seconds)
+    RegenerationWorker.perform_async(account_id) if redis.set("account:#{account_id}:regeneration", true, nx: true, ex: 1.day.seconds)
   end
 
   def needs_feed_update?

app/services/activitypub/process_account_service.rb

@@ -3,6 +3,7 @@
 class ActivityPub::ProcessAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
+  include Redisable
 
   # Should be called with confirmed valid JSON
   # and WebFinger-resolved username and domain
@@ -289,7 +290,7 @@ class ActivityPub::ProcessAccountService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "process_account:#{@uri}", autorelease: 15.minutes.seconds }
+    { redis: redis, key: "process_account:#{@uri}", autorelease: 15.minutes.seconds }
   end
 
   def process_tags

app/services/activitypub/process_status_update_service.rb

@@ -2,6 +2,7 @@
 
 class ActivityPub::ProcessStatusUpdateService < BaseService
   include JsonLdHelper
+  include Redisable
 
   def call(status, json)
     raise ArgumentError, 'Status has unsaved changes' if status.changed?
@@ -241,7 +242,7 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "create:#{@uri}", autorelease: 15.minutes.seconds }
+    { redis: redis, key: "create:#{@uri}", autorelease: 15.minutes.seconds }
   end
 
   def record_previous_edit!

app/services/fan_out_on_write_service.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class FanOutOnWriteService < BaseService
+  include Redisable
+
   # Push a status into home and mentions feeds
   # @param [Status] status
   # @param [Hash] options
@@ -99,20 +101,20 @@ class FanOutOnWriteService < BaseService
 
   def broadcast_to_hashtag_streams!
     @status.tags.pluck(:name).each do |hashtag|
-      Redis.current.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}", anonymous_payload)
+      redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}", anonymous_payload)
-      Redis.current.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}:local", anonymous_payload) if @status.local?
+      redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}:local", anonymous_payload) if @status.local?
     end
   end
 
   def broadcast_to_public_streams!
     return if @status.reply? && @status.in_reply_to_account_id != @account.id
 
-    Redis.current.publish('timeline:public', anonymous_payload)
+    redis.publish('timeline:public', anonymous_payload)
-    Redis.current.publish(@status.local? ? 'timeline:public:local' : 'timeline:public:remote', anonymous_payload)
+    redis.publish(@status.local? ? 'timeline:public:local' : 'timeline:public:remote', anonymous_payload)
 
     if @status.with_media?
-      Redis.current.publish('timeline:public:media', anonymous_payload)
+      redis.publish('timeline:public:media', anonymous_payload)
-      Redis.current.publish(@status.local? ? 'timeline:public:local:media' : 'timeline:public:remote:media', anonymous_payload)
+      redis.publish(@status.local? ? 'timeline:public:local:media' : 'timeline:public:remote:media', anonymous_payload)
     end
   end
 

app/services/fetch_link_card_service.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class FetchLinkCardService < BaseService
+  include Redisable
+
   URL_PATTERN = %r{
     (#{Twitter::TwitterText::Regex[:valid_url_preceding_chars]})                                                                #   $1 preceding chars
     (                                                                                                                           #   $2 URL
@@ -155,6 +157,6 @@ class FetchLinkCardService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "fetch:#{@original_url}", autorelease: 15.minutes.seconds }
+    { redis: redis, key: "fetch:#{@original_url}", autorelease: 15.minutes.seconds }
   end
 end

app/services/precompute_feed_service.rb

@@ -1,9 +1,11 @@
 # frozen_string_literal: true
 
 class PrecomputeFeedService < BaseService
+  include Redisable
+
   def call(account)
     FeedManager.instance.populate_home(account)
   ensure
-    Redis.current.del("account:#{account.id}:regeneration")
+    redis.del("account:#{account.id}:regeneration")
   end
 end

app/services/remove_status_service.rb

@@ -146,6 +146,6 @@ class RemoveStatusService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "distribute:#{@status.id}", autorelease: 5.minutes.seconds }
+    { redis: redis, key: "distribute:#{@status.id}", autorelease: 5.minutes.seconds }
   end
 end

app/services/resolve_account_service.rb

@@ -4,6 +4,7 @@ class ResolveAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
   include WebfingerHelper
+  include Redisable
 
   # Find or create an account record for a remote user. When creating,
   # look up the user's webfinger and fetch ActivityPub data
@@ -147,6 +148,6 @@ class ResolveAccountService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "resolve:#{@username}@#{@domain}", autorelease: 15.minutes.seconds }
+    { redis: redis, key: "resolve:#{@username}@#{@domain}", autorelease: 15.minutes.seconds }
   end
 end

app/services/vote_service.rb

@@ -3,6 +3,7 @@
 class VoteService < BaseService
   include Authorization
   include Payloadable
+  include Redisable
 
   def call(account, poll, choices)
     authorize_with account, poll, :vote?
@@ -77,6 +78,6 @@ class VoteService < BaseService
   end
 
   def lock_options
-    { redis: Redis.current, key: "vote:#{@poll.id}:#{@account.id}" }
+    { redis: redis, key: "vote:#{@poll.id}:#{@account.id}" }
   end
 end

app/workers/distribution_worker.rb

@@ -2,9 +2,10 @@
 
 class DistributionWorker
   include Sidekiq::Worker
+  include Redisable
 
   def perform(status_id, options = {})
-    RedisLock.acquire(redis: Redis.current, key: "distribute:#{status_id}", autorelease: 5.minutes.seconds) do |lock|
+    RedisLock.acquire(redis: redis, key: "distribute:#{status_id}", autorelease: 5.minutes.seconds) do |lock|
       if lock.acquired?
         FanOutOnWriteService.new.call(Status.find(status_id), **options.symbolize_keys)
       else

app/workers/merge_worker.rb

@@ -2,12 +2,13 @@
 
 class MergeWorker
   include Sidekiq::Worker
+  include Redisable
 
   def perform(from_account_id, into_account_id)
     FeedManager.instance.merge_into_home(Account.find(from_account_id), Account.find(into_account_id))
   rescue ActiveRecord::RecordNotFound
     true
   ensure
-    Redis.current.del("account:#{into_account_id}:regeneration")
+    redis.del("account:#{into_account_id}:regeneration")
   end
 end

app/workers/scheduler/accounts_statuses_cleanup_scheduler.rb

@@ -2,6 +2,7 @@
 
 class Scheduler::AccountsStatusesCleanupScheduler
   include Sidekiq::Worker
+  include Redisable
 
   # This limit is mostly to be nice to the fediverse at large and not
   # generate too much traffic.
@@ -83,14 +84,14 @@ class Scheduler::AccountsStatusesCleanupScheduler
   end
 
   def last_processed_id
-    Redis.current.get('account_statuses_cleanup_scheduler:last_account_id')
+    redis.get('account_statuses_cleanup_scheduler:last_account_id')
   end
 
   def save_last_processed_id(id)
     if id.nil?
-      Redis.current.del('account_statuses_cleanup_scheduler:last_account_id')
+      redis.del('account_statuses_cleanup_scheduler:last_account_id')
     else
-      Redis.current.set('account_statuses_cleanup_scheduler:last_account_id', id, ex: 1.hour.seconds)
+      redis.set('account_statuses_cleanup_scheduler:last_account_id', id, ex: 1.hour.seconds)
     end
   end
 end

config/application.rb

@@ -35,6 +35,7 @@ require_relative '../lib/paperclip/response_with_limit_adapter'
 require_relative '../lib/terrapin/multi_pipe_extensions'
 require_relative '../lib/mastodon/snowflake'
 require_relative '../lib/mastodon/version'
+require_relative '../lib/mastodon/rack_middleware'
 require_relative '../lib/devise/two_factor_ldap_authenticatable'
 require_relative '../lib/devise/two_factor_pam_authenticatable'
 require_relative '../lib/chewy/strategy/custom_sidekiq'
@@ -164,6 +165,7 @@ module Mastodon
 
     config.middleware.use Rack::Attack
     config.middleware.use Rack::Deflater
+    config.middleware.use Mastodon::RackMiddleware
 
     config.to_prepare do
       Doorkeeper::AuthorizationsController.layout 'modal'

config/initializers/redis.rb

@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-redis_connection = Redis.new(
-  url: ENV['REDIS_URL'],
-  driver: :hiredis
-)
-
-namespace = ENV.fetch('REDIS_NAMESPACE') { nil }
-
-if namespace
-  Redis.current = Redis::Namespace.new(namespace, redis: redis_connection)
-else
-  Redis.current = redis_connection
-end

config/initializers/sidekiq.rb

@@ -1,12 +1,12 @@
 # frozen_string_literal: true
 
-require_relative '../../lib/sidekiq_error_handler'
+require_relative '../../lib/mastodon/sidekiq_middleware'
 
 Sidekiq.configure_server do |config|
   config.redis = REDIS_SIDEKIQ_PARAMS
 
   config.server_middleware do |chain|
-    chain.add SidekiqErrorHandler
+    chain.add Mastodon::SidekiqMiddleware
   end
 
   config.server_middleware do |chain|

lib/mastodon/feeds_cli.rb

@@ -7,6 +7,7 @@ require_relative 'cli_helper'
 module Mastodon
   class FeedsCLI < Thor
     include CLIHelper
+    include Redisable
 
     def self.exit_on_failure?
       true
@@ -51,10 +52,10 @@ module Mastodon
 
     desc 'clear', 'Remove all home and list feeds from Redis'
     def clear
-      keys = Redis.current.keys('feed:*')
+      keys = redis.keys('feed:*')
 
-      Redis.current.pipelined do
+      redis.pipelined do
-        keys.each { |key| Redis.current.del(key) }
+        keys.each { |key| redis.del(key) }
       end
 
       say('OK', :green)

lib/mastodon/rack_middleware.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class Mastodon::RackMiddleware
+  def initialize(app)
+    @app = app
+  end
+
+  def call(env)
+    @app.call(env)
+  ensure
+    clean_up_sockets!
+  end
+
+  private
+
+  def clean_up_sockets!
+    clean_up_redis_socket!
+    clean_up_statsd_socket!
+  end
+
+  def clean_up_redis_socket!
+    Thread.current[:redis]&.close
+    Thread.current[:redis] = nil
+  end
+
+  def clean_up_statsd_socket!
+    Thread.current[:statsd_socket]&.close
+    Thread.current[:statsd_socket] = nil
+  end
+end

lib/mastodon/redis_config.rb

@@ -11,13 +11,15 @@ def setup_redis_env_url(prefix = nil, defaults = true)
   port     = ENV.fetch(prefix + 'REDIS_PORT') { 6379 if defaults }
   db       = ENV.fetch(prefix + 'REDIS_DB') { 0 if defaults }
 
-  ENV[prefix + 'REDIS_URL'] = if [password, host, port, db].all?(&:nil?)
+  ENV[prefix + 'REDIS_URL'] = begin
+    if [password, host, port, db].all?(&:nil?)
       ENV['REDIS_URL']
     else
       Addressable::URI.parse("redis://#{host}:#{port}/#{db}").tap do |uri|
         uri.password = password if password.present?
       end.normalize.to_str
     end
+  end
 end
 
 setup_redis_env_url
@@ -33,6 +35,8 @@ REDIS_CACHE_PARAMS = {
   url: ENV['CACHE_REDIS_URL'],
   expires_in: 10.minutes,
   namespace: cache_namespace,
+  pool_size: Sidekiq.server? ? Sidekiq.options[:concurrency] : Integer(ENV['MAX_THREADS'] || 5),
+  pool_timeout: 5,
 }.freeze
 
 REDIS_SIDEKIQ_PARAMS = {
@@ -40,3 +44,7 @@ REDIS_SIDEKIQ_PARAMS = {
   url: ENV['SIDEKIQ_REDIS_URL'],
   namespace: sidekiq_namespace,
 }.freeze
+
+if Rails.env.test?
+  ENV['REDIS_NAMESPACE'] = "mastodon_test#{ENV['TEST_ENV_NUMBER']}"
+end

lib/mastodon/sidekiq_middleware.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-class SidekiqErrorHandler
+class Mastodon::SidekiqMiddleware
   BACKTRACE_LIMIT = 3
 
   def call(*)
@@ -10,9 +10,7 @@ class SidekiqErrorHandler
   rescue => e
     limit_backtrace_and_raise(e)
   ensure
-    socket = Thread.current[:statsd_socket]
+    clean_up_sockets!
-    socket&.close
-    Thread.current[:statsd_socket] = nil
   end
 
   private
@@ -21,4 +19,19 @@ class SidekiqErrorHandler
     exception.set_backtrace(exception.backtrace.first(BACKTRACE_LIMIT))
     raise exception
   end
+
+  def clean_up_sockets!
+    clean_up_redis_socket!
+    clean_up_statsd_socket!
+  end
+
+  def clean_up_redis_socket!
+    Thread.current[:redis]&.close
+    Thread.current[:redis] = nil
+  end
+
+  def clean_up_statsd_socket!
+    Thread.current[:statsd_socket]&.close
+    Thread.current[:statsd_socket] = nil
+  end
 end

spec/controllers/concerns/user_tracking_concern_spec.rb

@@ -65,22 +65,22 @@ describe ApplicationController, type: :controller do
         get :show
 
         expect_updated_sign_in_at(user)
-        expect(Redis.current.get("account:#{user.account_id}:regeneration")).to eq 'true'
+        expect(redis.get("account:#{user.account_id}:regeneration")).to eq 'true'
         expect(RegenerationWorker).to have_received(:perform_async)
       end
 
       it 'sets the regeneration marker to expire' do
         allow(RegenerationWorker).to receive(:perform_async)
         get :show
-        expect(Redis.current.ttl("account:#{user.account_id}:regeneration")).to be >= 0
+        expect(redis.ttl("account:#{user.account_id}:regeneration")).to be >= 0
       end
 
       it 'regenerates feed when sign in is older than two weeks' do
         get :show
 
         expect_updated_sign_in_at(user)
-        expect(Redis.current.zcard(FeedManager.instance.key(:home, user.account_id))).to eq 3
+        expect(redis.zcard(FeedManager.instance.key(:home, user.account_id))).to eq 3
-        expect(Redis.current.get("account:#{user.account_id}:regeneration")).to be_nil
+        expect(redis.get("account:#{user.account_id}:regeneration")).to be_nil
       end
     end
 

spec/lib/activitypub/activity/move_spec.rb

@@ -84,9 +84,9 @@ RSpec.describe ActivityPub::Activity::Move do
 
     context 'when a Move has been recently processed' do
       around do |example|
-        Redis.current.set("move_in_progress:#{old_account.id}", true, nx: true, ex: 7.days.seconds)
+        redis.set("move_in_progress:#{old_account.id}", true, nx: true, ex: 7.days.seconds)
         example.run
-        Redis.current.del("move_in_progress:#{old_account.id}")
+        redis.del("move_in_progress:#{old_account.id}")
       end
 
       it 'does not set moved account on old account' do

spec/lib/delivery_failure_tracker_spec.rb

@@ -22,7 +22,7 @@ describe DeliveryFailureTracker do
 
   describe '#track_failure!' do
     it 'marks URL as unavailable after 7 days of being called' do
-      6.times { |i| Redis.current.sadd('exhausted_deliveries:example.com', i) }
+      6.times { |i| redis.sadd('exhausted_deliveries:example.com', i) }
       subject.track_failure!
 
       expect(subject.days).to eq 7

spec/lib/feed_manager_spec.rb

@@ -195,11 +195,11 @@ RSpec.describe FeedManager do
       account = Fabricate(:account)
       status = Fabricate(:status)
       members = FeedManager::MAX_ITEMS.times.map { |count| [count, count] }
-      Redis.current.zadd("feed:home:#{account.id}", members)
+      redis.zadd("feed:home:#{account.id}", members)
 
       FeedManager.instance.push_to_home(account, status)
 
-      expect(Redis.current.zcard("feed:home:#{account.id}")).to eq FeedManager::MAX_ITEMS
+      expect(redis.zcard("feed:home:#{account.id}")).to eq FeedManager::MAX_ITEMS
     end
 
     context 'reblogs' do
@@ -424,7 +424,7 @@ RSpec.describe FeedManager do
 
       FeedManager.instance.merge_into_home(account, reblog.account)
 
-      expect(Redis.current.zscore("feed:home:0", reblog.id)).to eq nil
+      expect(redis.zscore("feed:home:0", reblog.id)).to eq nil
     end
   end
 
@@ -440,13 +440,13 @@ RSpec.describe FeedManager do
       FeedManager.instance.push_to_home(receiver, status)
 
       # The reblogging status should show up under normal conditions.
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to include(status.id.to_s)
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to include(status.id.to_s)
 
       FeedManager.instance.unpush_from_home(receiver, status)
 
       # Restore original status
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to_not include(status.id.to_s)
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to_not include(status.id.to_s)
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to include(reblogged.id.to_s)
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to include(reblogged.id.to_s)
     end
 
     it 'removes a reblogged status if it was only reblogged once' do
@@ -456,11 +456,11 @@ RSpec.describe FeedManager do
       FeedManager.instance.push_to_home(receiver, status)
 
       # The reblogging status should show up under normal conditions.
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [status.id.to_s]
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [status.id.to_s]
 
       FeedManager.instance.unpush_from_home(receiver, status)
 
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to be_empty
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to be_empty
     end
 
     it 'leaves a multiply-reblogged status if another reblog was in feed' do
@@ -472,13 +472,13 @@ RSpec.describe FeedManager do
       end
 
       # The reblogging status should show up under normal conditions.
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [reblogs.first.id.to_s]
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [reblogs.first.id.to_s]
 
       reblogs[0...-1].each do |reblog|
         FeedManager.instance.unpush_from_home(receiver, reblog)
       end
 
-      expect(Redis.current.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [reblogs.last.id.to_s]
+      expect(redis.zrange("feed:home:#{receiver.id}", 0, -1)).to eq [reblogs.last.id.to_s]
     end
 
     it 'sends push updates' do
@@ -486,11 +486,11 @@ RSpec.describe FeedManager do
 
       FeedManager.instance.push_to_home(receiver, status)
 
-      allow(Redis.current).to receive_messages(publish: nil)
+      allow(redis).to receive_messages(publish: nil)
       FeedManager.instance.unpush_from_home(receiver, status)
 
       deletion = Oj.dump(event: :delete, payload: status.id.to_s)
-      expect(Redis.current).to have_received(:publish).with("timeline:#{receiver.id}", deletion)
+      expect(redis).to have_received(:publish).with("timeline:#{receiver.id}", deletion)
     end
   end
 
@@ -508,14 +508,14 @@ RSpec.describe FeedManager do
 
     before do
       [status_1, status_3, status_5, status_6, status_7].each do |status|
-        Redis.current.zadd("feed:home:#{account.id}", status.id, status.id)
+        redis.zadd("feed:home:#{account.id}", status.id, status.id)
       end
     end
 
     it 'correctly cleans the home timeline' do
       FeedManager.instance.clear_from_home(account, target_account)
 
-      expect(Redis.current.zrange("feed:home:#{account.id}", 0, -1)).to eq [status_1.id.to_s, status_7.id.to_s]
+      expect(redis.zrange("feed:home:#{account.id}", 0, -1)).to eq [status_1.id.to_s, status_7.id.to_s]
     end
   end
 end

spec/models/home_feed_spec.rb

@@ -15,7 +15,7 @@ RSpec.describe HomeFeed, type: :model do
 
     context 'when feed is generated' do
       before do
-        Redis.current.zadd(
+        redis.zadd(
           FeedManager.instance.key(:home, account.id),
           [[4, 4], [3, 3], [2, 2], [1, 1]]
         )
@@ -31,7 +31,7 @@ RSpec.describe HomeFeed, type: :model do
 
     context 'when feed is being generated' do
       before do
-        Redis.current.set("account:#{account.id}:regeneration", true)
+        redis.set("account:#{account.id}:regeneration", true)
       end
 
       it 'returns nothing' do

spec/rails_helper.rb

@@ -13,7 +13,6 @@ Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }
 
 ActiveRecord::Migration.maintain_test_schema!
 WebMock.disable_net_connect!(allow: Chewy.settings[:host])
-Redis.current = Redis::Namespace.new("mastodon_test#{ENV['TEST_ENV_NUMBER']}", redis: Redis.current)
 Sidekiq::Testing.inline!
 Sidekiq.logger = nil
 
@@ -44,6 +43,7 @@ RSpec.configure do |config|
   config.include Devise::Test::ControllerHelpers, type: :view
   config.include Paperclip::Shoulda::Matchers
   config.include ActiveSupport::Testing::TimeHelpers
+  config.include Redisable
 
   config.before :each, type: :feature do
     https = ENV['LOCAL_HTTPS'] == 'true'
@@ -60,7 +60,7 @@ RSpec.configure do |config|
 
   config.after :each do
     Rails.cache.clear
-    Redis.current.del(Redis.current.keys)
+    redis.del(redis.keys)
   end
 end
 

spec/services/after_block_service_spec.rb

@@ -14,7 +14,7 @@ RSpec.describe AfterBlockService, type: :service do
     let(:home_timeline_key) { FeedManager.instance.key(:home, account.id) }
 
     before do
-      Redis.current.del(home_timeline_key)
+      redis.del(home_timeline_key)
     end
 
     it "clears account's statuses" do
@@ -23,7 +23,7 @@ RSpec.describe AfterBlockService, type: :service do
       FeedManager.instance.push_to_home(account, other_account_reblog)
 
       expect { subject }.to change {
-        Redis.current.zrange(home_timeline_key, 0, -1)
+        redis.zrange(home_timeline_key, 0, -1)
       }.from([status.id.to_s, other_account_status.id.to_s, other_account_reblog.id.to_s]).to([other_account_status.id.to_s])
     end
   end
@@ -33,7 +33,7 @@ RSpec.describe AfterBlockService, type: :service do
     let(:list_timeline_key) { FeedManager.instance.key(:list, list.id) }
 
     before do
-      Redis.current.del(list_timeline_key)
+      redis.del(list_timeline_key)
     end
 
     it "clears account's statuses" do
@@ -42,7 +42,7 @@ RSpec.describe AfterBlockService, type: :service do
       FeedManager.instance.push_to_list(list, other_account_reblog)
 
       expect { subject }.to change {
-        Redis.current.zrange(list_timeline_key, 0, -1)
+        redis.zrange(list_timeline_key, 0, -1)
       }.from([status.id.to_s, other_account_status.id.to_s, other_account_reblog.id.to_s]).to([other_account_status.id.to_s])
     end
   end

spec/services/batched_remove_status_service_spec.rb

@@ -12,7 +12,7 @@ RSpec.describe BatchedRemoveStatusService, type: :service do
   let(:status2) { PostStatusService.new.call(alice, text: 'Another status') }
 
   before do
-    allow(Redis.current).to receive_messages(publish: nil)
+    allow(redis).to receive_messages(publish: nil)
 
     stub_request(:post, 'http://example.com/inbox').to_return(status: 200)
 
@@ -40,11 +40,11 @@ RSpec.describe BatchedRemoveStatusService, type: :service do
   end
 
   it 'notifies streaming API of followers' do
-    expect(Redis.current).to have_received(:publish).with("timeline:#{jeff.id}", any_args).at_least(:once)
+    expect(redis).to have_received(:publish).with("timeline:#{jeff.id}", any_args).at_least(:once)
   end
 
   it 'notifies streaming API of public timeline' do
-    expect(Redis.current).to have_received(:publish).with('timeline:public', any_args).at_least(:once)
+    expect(redis).to have_received(:publish).with('timeline:public', any_args).at_least(:once)
   end
 
   it 'sends delete activity to followers' do

spec/services/fan_out_on_write_service_spec.rb

@@ -18,7 +18,7 @@ RSpec.describe FanOutOnWriteService, type: :service do
     ProcessMentionsService.new.call(status)
     ProcessHashtagsService.new.call(status)
 
-    allow(Redis.current).to receive(:publish)
+    allow(redis).to receive(:publish)
 
     subject.call(status)
   end
@@ -40,13 +40,13 @@ RSpec.describe FanOutOnWriteService, type: :service do
     end
 
     it 'is broadcast to the hashtag stream' do
-      expect(Redis.current).to have_received(:publish).with('timeline:hashtag:hoge', anything)
+      expect(redis).to have_received(:publish).with('timeline:hashtag:hoge', anything)
-      expect(Redis.current).to have_received(:publish).with('timeline:hashtag:hoge:local', anything)
+      expect(redis).to have_received(:publish).with('timeline:hashtag:hoge:local', anything)
     end
 
     it 'is broadcast to the public stream' do
-      expect(Redis.current).to have_received(:publish).with('timeline:public', anything)
+      expect(redis).to have_received(:publish).with('timeline:public', anything)
-      expect(Redis.current).to have_received(:publish).with('timeline:public:local', anything)
+      expect(redis).to have_received(:publish).with('timeline:public:local', anything)
     end
   end
 
@@ -66,8 +66,8 @@ RSpec.describe FanOutOnWriteService, type: :service do
     end
 
     it 'is not broadcast publicly' do
-      expect(Redis.current).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
-      expect(Redis.current).to_not have_received(:publish).with('timeline:public', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:public', anything)
     end
   end
 
@@ -84,8 +84,8 @@ RSpec.describe FanOutOnWriteService, type: :service do
     end
 
     it 'is not broadcast publicly' do
-      expect(Redis.current).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
-      expect(Redis.current).to_not have_received(:publish).with('timeline:public', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:public', anything)
     end
   end
 
@@ -105,8 +105,8 @@ RSpec.describe FanOutOnWriteService, type: :service do
     end
 
     it 'is not broadcast publicly' do
-      expect(Redis.current).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:hashtag:hoge', anything)
-      expect(Redis.current).to_not have_received(:publish).with('timeline:public', anything)
+      expect(redis).to_not have_received(:publish).with('timeline:public', anything)
     end
   end
 end

spec/services/mute_service_spec.rb

@@ -12,7 +12,7 @@ RSpec.describe MuteService, type: :service do
     let(:home_timeline_key) { FeedManager.instance.key(:home, account.id) }
 
     before do
-      Redis.current.del(home_timeline_key)
+      redis.del(home_timeline_key)
     end
 
     it "clears account's statuses" do
@@ -20,7 +20,7 @@ RSpec.describe MuteService, type: :service do
       FeedManager.instance.push_to_home(account, other_account_status)
 
       expect { subject }.to change {
-        Redis.current.zrange(home_timeline_key, 0, -1)
+        redis.zrange(home_timeline_key, 0, -1)
       }.from([status.id.to_s, other_account_status.id.to_s]).to([other_account_status.id.to_s])
     end
   end

spec/services/precompute_feed_service_spec.rb

@@ -13,7 +13,7 @@ RSpec.describe PrecomputeFeedService, type: :service do
 
       subject.call(account)
 
-      expect(Redis.current.zscore(FeedManager.instance.key(:home, account.id), status.id)).to be_within(0.1).of(status.id.to_f)
+      expect(redis.zscore(FeedManager.instance.key(:home, account.id), status.id)).to be_within(0.1).of(status.id.to_f)
     end
 
     it 'does not raise an error even if it could not find any status' do
@@ -30,7 +30,7 @@ RSpec.describe PrecomputeFeedService, type: :service do
 
       subject.call(account)
 
-      expect(Redis.current.zscore(FeedManager.instance.key(:home, account.id), reblog.id)).to eq nil
+      expect(redis.zscore(FeedManager.instance.key(:home, account.id), reblog.id)).to eq nil
     end
   end
 end

spec/workers/scheduler/feed_cleanup_scheduler_spec.rb

@@ -7,17 +7,17 @@ describe Scheduler::FeedCleanupScheduler do
   let!(:inactive_user) { Fabricate(:user, current_sign_in_at: 22.days.ago) }
 
   it 'clears feeds of inactives' do
-    Redis.current.zadd(feed_key_for(inactive_user), 1, 1)
+    redis.zadd(feed_key_for(inactive_user), 1, 1)
-    Redis.current.zadd(feed_key_for(active_user), 1, 1)
+    redis.zadd(feed_key_for(active_user), 1, 1)
-    Redis.current.zadd(feed_key_for(inactive_user, 'reblogs'), 2, 2)
+    redis.zadd(feed_key_for(inactive_user, 'reblogs'), 2, 2)
-    Redis.current.sadd(feed_key_for(inactive_user, 'reblogs:2'), 3)
+    redis.sadd(feed_key_for(inactive_user, 'reblogs:2'), 3)
 
     subject.perform
 
-    expect(Redis.current.zcard(feed_key_for(inactive_user))).to eq 0
+    expect(redis.zcard(feed_key_for(inactive_user))).to eq 0
-    expect(Redis.current.zcard(feed_key_for(active_user))).to eq 1
+    expect(redis.zcard(feed_key_for(active_user))).to eq 1
-    expect(Redis.current.exists?(feed_key_for(inactive_user, 'reblogs'))).to be false
+    expect(redis.exists?(feed_key_for(inactive_user, 'reblogs'))).to be false
-    expect(Redis.current.exists?(feed_key_for(inactive_user, 'reblogs:2'))).to be false
+    expect(redis.exists?(feed_key_for(inactive_user, 'reblogs:2'))).to be false
   end
 
   def feed_key_for(user, subtype = nil)