content: /*
   * Copyright 1999-2023 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.plugin.control.impl;
  
  import com.alibaba.nacos.common.executor.ExecutorFactory;
  import com.alibaba.nacos.plugin.control.Loggers;
  import com.alibaba.nacos.plugin.control.tps.TpsControlManager;
  import com.alibaba.nacos.plugin.control.tps.TpsMetrics;
  import com.alibaba.nacos.plugin.control.tps.barrier.TpsBarrier;
  import com.alibaba.nacos.plugin.control.tps.request.TpsCheckRequest;
  import com.alibaba.nacos.plugin.control.tps.response.TpsCheckResponse;
  import com.alibaba.nacos.plugin.control.tps.response.TpsResultCode;
  import com.alibaba.nacos.plugin.control.tps.rule.TpsControlRule;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ScheduledExecutorService;
  import java.util.concurrent.TimeUnit;
  
  /**
   * Nacos default control plugin implementation.
   *
   * @author shiyiyue
   */
  public class NacosTpsControlManager extends TpsControlManager {
      
      /**
       * point name -> tps barrier.
       */
      protected final Map<String, TpsBarrier> points = new ConcurrentHashMap<>(16);
      
      /**
       * point name -> tps control rule.
       */
      protected final Map<String, TpsControlRule> rules = new ConcurrentHashMap<>(16);
      
      protected ScheduledExecutorService executorService;
      
      public NacosTpsControlManager() {
          super();
          executorService = ExecutorFactory.newSingleScheduledExecutorService(r -> {
              Thread thread = new Thread(r, "nacos.plugin.tps.control.reporter");
              thread.setDaemon(true);
              return thread;
          });
          startTpsReport();
      }
      
      protected void startTpsReport() {
          executorService
                  .scheduleWithFixedDelay(new NacosTpsControlManager.TpsMetricsReporter(), 0, 900, TimeUnit.MILLISECONDS);
      }
      
      /**
       * apple tps rule.
       *
       * @param pointName pointName.
       */
      public synchronized void registerTpsPoint(String pointName) {
          if (!points.containsKey(pointName)) {
              points.put(pointName, tpsBarrierCreator.createTpsBarrier(pointName));
              if (rules.containsKey(pointName)) {
                  points.get(pointName).applyRule(rules.get(pointName));
              } else {
                  initTpsRule(pointName);
              }
          }
      }
      
      /**
       * apple tps rule.
       *
       * @param pointName pointName.
       * @param rule      rule.
       */
      public synchronized void applyTpsRule(String pointName, TpsControlRule rule) {
          if (rule == null) {
              rules.remove(pointName);
          } else {
              rules.put(pointName, rule);
          }
          if (points.containsKey(pointName)) {
              points.get(pointName).applyRule(rule);
          }
      }
      
      public Map<String, TpsBarrier> getPoints() {
          return points;
      }
      
      public Map<String, TpsControlRule> getRules() {
          return rules;
      }
      
      /**
       * check tps result.
       *
       * @param tpsRequest TpsRequest.
       * @return check current tps is allowed.
       */
      public TpsCheckResponse check(TpsCheckRequest tpsRequest) {
          
          if (points.containsKey(tpsRequest.getPointName())) {
              try {
                  return points.get(tpsRequest.getPointName()).applyTps(tpsRequest);
              } catch (Throwable throwable) {
                  Loggers.TPS.warn("[{}]apply tps error,error={}", tpsRequest.getPointName(), throwable);
              }
          }
          return new TpsCheckResponse(true, TpsResultCode.CHECK_SKIP, "skip");
          
      }
      
      class TpsMetricsReporter implements Runnable {
          
          long lastReportSecond = 0L;
          
          /**
           * get format string "2021-01-16 17:20:21" of timestamp.
           *
           * @param timeStamp timestamp milliseconds.
           * @return
           */
          public String getTimeFormatOfSecond(long timeStamp) {
              String format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(timeStamp));
              return format;
          }
          
          @Override
          public void run() {
              try {
                  long now = System.currentTimeMillis();
                  StringBuilder stringBuilder = new StringBuilder();
                  Set<Map.Entry<String, TpsBarrier>> entries = points.entrySet();
                  
                  long tempSecond = 0L;
                  
                  long metricsTime = now - 1000L;
                  String formatString = getTimeFormatOfSecond(metricsTime);
                  for (Map.Entry<String, TpsBarrier> entry : entries) {
                      TpsBarrier tpsBarrier = entry.getValue();
                      String pointName = entry.getKey();
                      TpsMetrics metrics = tpsBarrier.getPointBarrier().getMetrics(metricsTime);
                      if (metrics != null) {
                          //already reported.
                          if (lastReportSecond != 0L && lastReportSecond == metrics.getTimeStamp()) {
                              continue;
                          }
                          tempSecond = metrics.getTimeStamp();
                          
                          stringBuilder.append(pointName).append("|").append("point").append("|")
                                  .append(metrics.getPeriod()).append("|").append(formatString).append("|")
                                  .append(metrics.getCounter().getPassCount()).append("|")
                                  .append(metrics.getCounter().getDeniedCount()).append("|").append("\n");
                      }
                  }
                  
                  if (tempSecond > 0) {
                      lastReportSecond = tempSecond;
                  }
                  
                  if (stringBuilder.length() > 0) {
                      Loggers.TPS.info("Tps reporting...\n" + stringBuilder.toString());
                  }
              } catch (Throwable throwable) {
                  Loggers.TPS.error("Tps reporting error", throwable);
              }
              
          }
      }
      
      @Override
      public String getName() {
          return "nacos";
      }
  }
  