Stop testing hiredis

The driver being used is an implementation detail of `redis-rb`.
If somehow something break on one driver but not the other, it should
be reported to redis-rb and fixed there.

Also `redis-rb` `5.0` has a totally new client and hiredis binding
so all this code no longer works with redis-rb 5.0.

Gemfile

@@ -85,8 +85,7 @@ end
 group :cable do
   gem "puma", require: false
 
-  gem "hiredis", require: false
-  gem "redis", "~> 4.0", require: false
+  gem "redis", ">= 4.0.1", require: false
 
   gem "redis-namespace"
 

Gemfile.lock

@@ -284,7 +284,6 @@ GEM
       os (>= 0.9, < 2.0)
       signet (>= 0.16, < 2.a)
     hashdiff (1.0.1)
-    hiredis (0.6.3)
     http_parser.rb (0.8.0)
     httpclient (2.8.3)
     i18n (1.8.11)
@@ -400,7 +399,7 @@ GEM
     rbtree (0.4.5)
     rdoc (6.3.3)
     redcarpet (3.2.3)
-    redis (4.5.1)
+    redis (4.7.1)
     redis-namespace (1.8.1)
       redis (>= 3.0.4)
     regexp_parser (2.2.1)
@@ -574,7 +573,6 @@ DEPENDENCIES
   delayed_job
   delayed_job_active_record
   google-cloud-storage (~> 1.11)
-  hiredis
   image_processing (~> 1.2)
   importmap-rails
   jsbundling-rails
@@ -598,7 +596,7 @@ DEPENDENCIES
   rails!
   rake (>= 11.1)
   redcarpet (~> 3.2.3)
-  redis (~> 4.0)
+  redis (>= 4.0.1)
   redis-namespace
   resque
   resque-scheduler

actioncable/test/subscription_adapter/redis_test.rb

@@ -17,12 +17,6 @@ class RedisAdapterTest < ActionCable::TestCase
   end
 end
 
-class RedisAdapterTest::Hiredis < RedisAdapterTest
-  def cable_config
-    super.merge(driver: "hiredis")
-  end
-end
-
 class RedisAdapterTest::AlternateConfiguration < RedisAdapterTest
   def cable_config
     alt_cable_config = super.dup

activesupport/Rakefile

@@ -13,29 +13,10 @@ Rake::TestTask.new do |t|
   t.ruby_opts = ["--dev"] if defined?(JRUBY_VERSION)
 end
 
-Rake::Task[:test].enhance do
-  Rake::Task["test:cache_stores:redis:ruby"].invoke
-end
-
 namespace :test do
   task :isolated do
     Dir.glob("test/**/*_test.rb").all? do |file|
       sh(Gem.ruby, "-w", file)
     end || raise("Failures")
   end
-
-  namespace :cache_stores do
-    namespace :redis do
-      %w[ ruby hiredis ].each do |driver|
-        task("env:#{driver}") { ENV["REDIS_DRIVER"] = driver }
-
-        Rake::TestTask.new(driver => "env:#{driver}") do |t|
-          t.test_files = ["test/cache/stores/redis_cache_store_test.rb"]
-          t.warning = true
-          t.verbose = true
-          t.ruby_opts = ["--dev"] if defined?(JRUBY_VERSION)
-        end
-      end
-    end
-  end
 end

activesupport/lib/active_support/cache/redis_cache_store.rb

@@ -5,16 +5,10 @@ begin
   require "redis"
   require "redis/distributed"
 rescue LoadError
-  warn "The Redis cache store requires the redis gem, version 4.0.1 or later. Please add it to your Gemfile: `gem \"redis\", \"~> 4.0\"`"
+  warn "The Redis cache store requires the redis gem, version 4.0.1 or later. Please add it to your Gemfile: `gem \"redis\", \">= 4.0.1\"`"
   raise
 end
 
-# Prefer the hiredis driver but don't require it.
-begin
-  require "redis/connection/hiredis"
-rescue LoadError
-end
-
 require "connection_pool"
 require "active_support/core_ext/numeric/time"
 require "active_support/digest"

activesupport/test/cache/stores/redis_cache_store_test.rb

@@ -5,12 +5,6 @@ require "active_support/cache"
 require "active_support/cache/redis_cache_store"
 require_relative "../behaviors"
 
-driver_name = %w[ ruby hiredis ].include?(ENV["REDIS_DRIVER"]) ? ENV["REDIS_DRIVER"] : "hiredis"
-driver = Object.const_get("Redis::Connection::#{driver_name.camelize}")
-
-Redis::Connection.drivers.clear
-Redis::Connection.drivers.append(driver)
-
 # Emulates a latency on Redis's back-end for the key latency to facilitate
 # connection pool testing.
 class SlowRedis < Redis
@@ -42,8 +36,6 @@ module ActiveSupport::Cache::RedisCacheStoreTests
     end
   end
 
-  DRIVER = %w[ ruby hiredis ].include?(ENV["REDIS_DRIVER"]) ? ENV["REDIS_DRIVER"] : "hiredis"
-
   class LookupTest < ActiveSupport::TestCase
     test "may be looked up as :redis_cache_store" do
       assert_kind_of ActiveSupport::Cache::RedisCacheStore,
@@ -56,7 +48,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
       assert_called_with Redis, :new, [
         url: nil,
         connect_timeout: 20, read_timeout: 1, write_timeout: 1,
-        reconnect_attempts: 0, driver: DRIVER
+        reconnect_attempts: 0
       ] do
         build
       end
@@ -66,7 +58,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
       assert_called_with Redis, :new, [
         url: nil,
         connect_timeout: 20, read_timeout: 1, write_timeout: 1,
-        reconnect_attempts: 0, driver: DRIVER
+        reconnect_attempts: 0
       ] do
         build url: []
       end
@@ -76,7 +68,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
       assert_called_with Redis, :new, [
         url: REDIS_URL,
         connect_timeout: 20, read_timeout: 1, write_timeout: 1,
-        reconnect_attempts: 0, driver: DRIVER
+        reconnect_attempts: 0
       ] do
         build url: REDIS_URL
       end
@@ -86,7 +78,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
       assert_called_with Redis, :new, [
         url: REDIS_URL,
         connect_timeout: 20, read_timeout: 1, write_timeout: 1,
-        reconnect_attempts: 0, driver: DRIVER
+        reconnect_attempts: 0
       ] do
         build url: [ REDIS_URL ]
       end
@@ -98,7 +90,6 @@ module ActiveSupport::Cache::RedisCacheStoreTests
         read_timeout: 1,
         write_timeout: 1,
         reconnect_attempts: 0,
-        driver: DRIVER
       }
 
       mock = Minitest::Mock.new
@@ -128,7 +119,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
 
     private
       def build(**kwargs)
-        ActiveSupport::Cache::RedisCacheStore.new(driver: DRIVER, **kwargs.merge(pool: false)).tap(&:redis)
+        ActiveSupport::Cache::RedisCacheStore.new(**kwargs.merge(pool: false)).tap(&:redis)
       end
   end
 
@@ -146,7 +137,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
     end
 
     def lookup_store(options = {})
-      ActiveSupport::Cache.lookup_store(:redis_cache_store, { timeout: 0.1, namespace: @namespace, driver: DRIVER, pool: false }.merge(options))
+      ActiveSupport::Cache.lookup_store(:redis_cache_store, { timeout: 0.1, namespace: @namespace, pool: false }.merge(options))
     end
 
     teardown do
@@ -452,7 +443,7 @@ module ActiveSupport::Cache::RedisCacheStoreTests
     test "clear all cache key with Redis::Distributed" do
       cache = ActiveSupport::Cache::RedisCacheStore.new(
         url: REDIS_URLS,
-        timeout: 0.1, namespace: @namespace, expires_in: 60, driver: DRIVER)
+        timeout: 0.1, namespace: @namespace, expires_in: 60)
       cache.write("foo", "bar")
       cache.write("fu", "baz")
       cache.clear

guides/source/caching_with_rails.md

@@ -517,16 +517,6 @@ To get started, add the redis gem to your Gemfile:
 gem 'redis'
 ```
 
-You can enable support for the faster [hiredis](https://github.com/redis/hiredis)
-connection library by additionally adding its ruby wrapper to your Gemfile:
-
-```ruby
-gem 'hiredis'
-```
-
-Redis cache store will automatically require and use hiredis if available. No further
-configuration is needed.
-
 Finally, add the configuration in the relevant `config/environments/*.rb` file:
 
 ```ruby