test: add several cases for Ractor

.rubocop.yml

@@ -1,5 +1,5 @@
 ---
-require:
+plugins:
   - rubocop-performance
   - rubocop-rake
   - rubocop-minitest

test/prof_stack2.rb

@@ -16,13 +16,13 @@ def run
 
     case mode = ENV.fetch('PROFILE_MODE', :single).to_sym
     when :single
-      execute(client, mode) do |client|
-        ATTEMPTS.times { |i| client.call('get', "key#{i}") }
+      execute(client, mode) do |cli|
+        ATTEMPTS.times { |i| cli.call('get', "key#{i}") }
       end
     when :transaction
-      execute(client, mode) do |client|
+      execute(client, mode) do |cli|
         ATTEMPTS.times do |i|
-          client.multi do |tx|
+          cli.multi do |tx|
             SIZE.times do |j|
               n = SIZE * i + j
               tx.call('set', "{group:#{i}}:key:#{n}", n)
@@ -31,9 +31,9 @@ def run
         end
       end
     when :pipeline
-      execute(client, mode) do |client|
+      execute(client, mode) do |cli|
         ATTEMPTS.times do |i|
-          client.pipelined do |pi|
+          cli.pipelined do |pi|
             SIZE.times do |j|
               n = SIZE * i + j
               pi.call('get', "key#{n}")

test/test_concurrency.rb

@@ -132,6 +132,84 @@ def test_threading_with_transaction
     assert_equal(WANT, @client.call('GET', '{key}1'))
   end
 
+  def test_ractor
+    skip('Ractor is not available') unless Object.const_defined?(:Ractor, false)
+    skip("#{RedisClient.default_driver} is not safe for Ractor") if RedisClient.default_driver != RedisClient::RubyConnection
+    skip('OpenSSL gem has non-shareable objects') if TEST_REDIS_SSL
+    skip('test case may get stuck') if RUBY_ENGINE == 'ruby' && RUBY_ENGINE_VERSION.split('.').take(2).join('.').to_f < 3.1
+
+    ractors = Array.new(MAX_THREADS) do |i|
+      Ractor.new(i) do |i|
+        c = ::RedisClient.cluster(
+          nodes: TEST_NODE_URIS,
+          fixed_hostname: TEST_FIXED_HOSTNAME,
+          **TEST_GENERIC_OPTIONS
+        ).new_client
+        c.call('get', "key#{i}")
+      rescue StandardError => e
+        e
+      ensure
+        c&.close
+      end
+    end
+
+    ractors.each { |r| assert_equal(WANT, r.take) }
+  end
+
+  def test_ractor_with_pipelining
+    skip('Ractor is not available') unless Object.const_defined?(:Ractor, false)
+    skip("#{RedisClient.default_driver} is not safe for Ractor") if RedisClient.default_driver != RedisClient::RubyConnection
+    skip('OpenSSL gem has non-shareable objects') if TEST_REDIS_SSL
+    skip('test case may get stuck') if RUBY_ENGINE == 'ruby' && RUBY_ENGINE_VERSION.split('.').take(2).join('.').to_f < 3.1
+
+    ractors = Array.new(MAX_THREADS) do |i|
+      Ractor.new(i) do |i|
+        c = ::RedisClient.cluster(
+          nodes: TEST_NODE_URIS,
+          fixed_hostname: TEST_FIXED_HOSTNAME,
+          **TEST_GENERIC_OPTIONS
+        ).new_client
+        c.pipelined do |pi|
+          pi.call('get', "key#{i}")
+          pi.call('echo', 'hi')
+        end
+      rescue StandardError => e
+        e
+      ensure
+        c&.close
+      end
+    end
+
+    ractors.each { |r| assert_equal([WANT, 'hi'], r.take) }
+  end
+
+  def test_ractor_with_transaction
+    skip('Ractor is not available') unless Object.const_defined?(:Ractor, false)
+    skip("#{RedisClient.default_driver} is not safe for Ractor") if RedisClient.default_driver != RedisClient::RubyConnection
+    skip('OpenSSL gem has non-shareable objects') if TEST_REDIS_SSL
+    skip('test case may get stuck') if RUBY_ENGINE == 'ruby' && RUBY_ENGINE_VERSION.split('.').take(2).join('.').to_f < 3.1
+
+    ractors = Array.new(MAX_THREADS) do |i|
+      Ractor.new(i) do |i|
+        c = ::RedisClient.cluster(
+          nodes: TEST_NODE_URIS,
+          fixed_hostname: TEST_FIXED_HOSTNAME,
+          **TEST_GENERIC_OPTIONS
+        ).new_client
+        c.multi(watch: ["key#{i}"]) do |tx|
+          tx.call('incr', "key#{i}")
+          tx.call('incr', "key#{i}")
+        end
+      rescue StandardError => e
+        e
+      ensure
+        c&.close
+      end
+    end
+
+    ractors.each { |r| assert_equal([2, 3], r.take) }
+  end
+
   private
 
   def new_test_client

test/testing_constants.rb

@@ -86,4 +86,9 @@
 BENCH_ENVOY_OPTIONS = { port: 7000, protocol: 2 }.freeze
 BENCH_REDIS_CLUSTER_PROXY_OPTIONS = { port: 7001, protocol: 2 }.freeze
 
+if Object.const_defined?(:Ractor, false) && Ractor.respond_to?(:make_shareable)
+  Ractor.make_shareable(TEST_NODE_URIS)
+  Ractor.make_shareable(TEST_GENERIC_OPTIONS)
+end
+
 # rubocop:enable Lint/UnderscorePrefixedVariableName