Adds a property to disable gateway redis integration.

Fixes gh-2052

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/config/GatewayRedisAutoConfiguration.java

@@ -24,6 +24,7 @@ import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration;
 import org.springframework.cloud.gateway.filter.ratelimit.RedisRateLimiter;
 import org.springframework.cloud.gateway.support.ConfigurationService;
@@ -43,6 +44,8 @@ import org.springframework.web.reactive.DispatcherHandler;
 @AutoConfigureBefore(GatewayAutoConfiguration.class)
 @ConditionalOnBean(ReactiveRedisTemplate.class)
 @ConditionalOnClass({ RedisTemplate.class, DispatcherHandler.class })
+@ConditionalOnProperty(name = "spring.cloud.gateway.redis.enabled",
+		matchIfMissing = true)
 class GatewayRedisAutoConfiguration {
 
 	@Bean

spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/config/GatewayRedisAutoConfigurationTests.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2013-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.gateway.config;
+
+import org.junit.Test;
+import org.junit.experimental.runners.Enclosed;
+import org.junit.runner.RunWith;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cloud.gateway.filter.ratelimit.RedisRateLimiter;
+import org.springframework.data.redis.core.script.RedisScript;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@RunWith(Enclosed.class)
+public class GatewayRedisAutoConfigurationTests {
+
+	@SpringBootConfiguration
+	@EnableAutoConfiguration
+	protected static class Config {
+
+	}
+
+	@RunWith(SpringRunner.class)
+	@SpringBootTest(classes = Config.class)
+	public static class EnabledByDefault {
+
+		@Autowired(required = false)
+		private RedisScript redisRequestRateLimiterScript;
+
+		@Autowired(required = false)
+		private RedisRateLimiter redisRateLimiter;
+
+		@Test
+		public void shouldInjectRedisBeans() {
+			assertThat(redisRequestRateLimiterScript).isNotNull();
+			assertThat(redisRateLimiter).isNotNull();
+		}
+
+	}
+
+	@RunWith(SpringRunner.class)
+	@SpringBootTest(classes = Config.class,
+			properties = "spring.cloud.gateway.redis.enabled=false")
+	public static class DisabledByProperty {
+
+		@Autowired(required = false)
+		private RedisScript redisRequestRateLimiterScript;
+
+		@Autowired(required = false)
+		private RedisRateLimiter redisRateLimiter;
+
+		@Test
+		public void shouldDisableRedisBeans() {
+			assertThat(redisRequestRateLimiterScript).isNull();
+			assertThat(redisRateLimiter).isNull();
+		}
+
+	}
+
+}