/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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
 *
 *      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.nacos.console.controller;

import com.alibaba.nacos.console.paramcheck.ConsoleDefaultHttpParamExtractor;
import com.alibaba.nacos.core.cluster.health.ModuleHealthCheckerHolder;
import com.alibaba.nacos.core.cluster.health.ReadinessResult;
import com.alibaba.nacos.core.paramcheck.ExtractorManager;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

/**
 * Health Controller.
 *
 * @author <a href="mailto:huangxiaoyu1018@gmail.com">hxy1991</a>
 */
@RestController("consoleHealth")
@RequestMapping("/v1/console/health")
@ExtractorManager.Extractor(httpExtractor = ConsoleDefaultHttpParamExtractor.class)
public class HealthController {

    /**
     * Whether the Nacos is in broken states or not, and cannot recover except by being restarted.
     *
     * @return HTTP code equal to 200 indicates that Nacos is in right states. HTTP code equal to 500 indicates that
     * Nacos is in broken states.
     */
    @GetMapping("/liveness")
    public ResponseEntity<String> liveness() {
        return ResponseEntity.ok().body("OK");
    }

    /**
     * Ready to receive the request or not.
     *
     * @return HTTP code equal to 200 indicates that Nacos is ready. HTTP code equal to 500 indicates that Nacos is not
     * ready.
     */
    @GetMapping("/readiness")
    public ResponseEntity<String> readiness(HttpServletRequest request) {
        ReadinessResult result = ModuleHealthCheckerHolder.getInstance().checkReadiness();
        if (result.isSuccess()) {
            return ResponseEntity.ok().body("OK");
        }
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(result.getResultMessage());
    }

}