Polish alibaba/spring-cloud-alibaba/#902 : [Nacos Discovery] create NacosDiscoveryHealthIndicator

spring-cloud-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/actuate/health/NacosDiscoveryHealthIndicator.java

@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *     http://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 com.alibaba.cloud.nacos.discovery.actuate.health;
+
+import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
+import com.alibaba.nacos.api.naming.NamingService;
+
+import org.springframework.boot.actuate.health.AbstractHealthIndicator;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthIndicator;
+
+/**
+ * The {@link HealthIndicator} for Nacos Discovery
+ * 
+ * @since 2.2.0
+ * 
+ * @see HealthIndicator
+ */
+public class NacosDiscoveryHealthIndicator extends AbstractHealthIndicator {
+
+	private final NacosDiscoveryProperties nacosDiscoveryProperties;
+
+	public NacosDiscoveryHealthIndicator(
+			NacosDiscoveryProperties nacosDiscoveryProperties) {
+		this.nacosDiscoveryProperties = nacosDiscoveryProperties;
+	}
+
+	@Override
+	protected void doHealthCheck(Health.Builder builder) throws Exception {
+		NamingService namingService = nacosDiscoveryProperties.namingServiceInstance();
+		// Just return "UP" or "DOWN"
+		String status = namingService.getServerStatus();
+		// Set the status to Builder
+		builder.status(status);
+		switch (status) {
+		case "UP":
+			builder.up();
+			break;
+		case "DOWN":
+			builder.down();
+			break;
+		default:
+			builder.unknown();
+			break;
+		}
+	}
+}

spring-cloud-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/endpoint/NacosDiscoveryEndpointAutoConfiguration.java

@@ -18,9 +18,12 @@ package com.alibaba.cloud.nacos.endpoint;
 
 import com.alibaba.cloud.nacos.ConditionalOnNacosDiscoveryEnabled;
 import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
+import com.alibaba.cloud.nacos.discovery.actuate.health.NacosDiscoveryHealthIndicator;
 
 import org.springframework.boot.actuate.autoconfigure.endpoint.condition.ConditionalOnEnabledEndpoint;
+import org.springframework.boot.actuate.autoconfigure.health.ConditionalOnEnabledHealthIndicator;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
+import org.springframework.boot.actuate.health.HealthIndicator;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
@@ -42,4 +45,10 @@ public class NacosDiscoveryEndpointAutoConfiguration {
 		return new NacosDiscoveryEndpoint(nacosDiscoveryProperties);
 	}
 
+	@Bean
+	@ConditionalOnEnabledHealthIndicator("nacos-discovery")
+	public HealthIndicator nacosDiscoveryHealthIndicator(
+			NacosDiscoveryProperties nacosDiscoveryProperties) {
+		return new NacosDiscoveryHealthIndicator(nacosDiscoveryProperties);
+	}
 }