content: /*
   * Copyright 2013-2023 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 com.alibaba.cloud.sidecar;
  
  import java.net.URI;
  import java.util.Map;
  
  import org.springframework.boot.actuate.health.AbstractHealthIndicator;
  import org.springframework.boot.actuate.health.Health;
  import org.springframework.core.ParameterizedTypeReference;
  import org.springframework.http.HttpMethod;
  import org.springframework.http.ResponseEntity;
  import org.springframework.web.client.RestTemplate;
  
  /**
   * @author www.itmuch.com
   */
  public class SidecarHealthIndicator extends AbstractHealthIndicator {
  
  	private final SidecarProperties sidecarProperties;
  
  	private final RestTemplate restTemplate;
  
  	public SidecarHealthIndicator(SidecarProperties sidecarProperties,
  			RestTemplate restTemplate) {
  		this.sidecarProperties = sidecarProperties;
  		this.restTemplate = restTemplate;
  	}
  
  	@Override
  	protected void doHealthCheck(Health.Builder builder) throws Exception {
  		try {
  			URI uri = this.sidecarProperties.getHealthCheckUrl();
  			if (uri == null) {
  				builder.up();
  				return;
  			}
  
  			ResponseEntity<Map<String, Object>> exchange = this.restTemplate.exchange(uri,
  					HttpMethod.GET, null,
  					new ParameterizedTypeReference<Map<String, Object>>() {
  					});
  
  			Map<String, Object> map = exchange.getBody();
  
  			if (map == null) {
  				this.getWarning(builder);
  				return;
  			}
  			Object status = map.get("status");
  			if (status instanceof String strStatus) {
  				builder.status(strStatus);
  			}
  			else {
  				this.getWarning(builder);
  			}
  		}
  		catch (Exception e) {
  			builder.down().withDetail("error", e.getMessage());
  		}
  	}
  
  	private void getWarning(Health.Builder builder) {
  		builder.unknown().withDetail("warning", "no status field in response");
  	}
  
  }
  