feat: support redis v4

lib/cover_rage/stores/redis.rb

@@ -9,13 +9,10 @@ module CoverRage
   module Stores
     class Redis
       KEY = 'cover_rage_records'
+      IS_REDIS_BELOW_V5 = Gem::Version.new(::Redis::VERSION) < Gem::Version.new('5')
       def initialize(url)
-        @redis =
-          if url.start_with?('rediss')
-            ::Redis.new(url:, ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE })
-          else
-            ::Redis.new(url:)
-          end
+        @redis = new_redis(url)
+        @redis_for_below_v5 = new_redis(url) if IS_REDIS_BELOW_V5
       end
 
       def transaction(&)
@@ -42,7 +39,14 @@ def update(records)
       end
 
       def list
-        result = @redis.hgetall(KEY)
+        # For Redis versions below 5, we need to use the separate client to read
+        # the data while the transaction is in progress.
+        client = if Thread.current[:redis_multi] && IS_REDIS_BELOW_V5
+                   @redis_for_below_v5
+                 else
+                   @redis
+                 end
+        result = client.hgetall(KEY)
         return [] if result.empty?
 
         result.map { |_, value| Record.new(**JSON.parse(value)) }
@@ -51,6 +55,16 @@ def list
       def clear
         @redis.del(KEY)
       end
+
+      private
+
+      def new_redis(url)
+        if url.start_with?('rediss')
+          ::Redis.new(url:, ssl_params: { verify_mode: OpenSSL::SSL::VERIFY_NONE })
+        else
+          ::Redis.new(url:)
+        end
+      end
     end
   end
 end