code: /*
   * 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 org.apache.skywalking.oap.server.receiver.zabbix.provider.protocol;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.receiver.zabbix.provider.ZabbixMetrics;
  import org.apache.skywalking.oap.server.receiver.zabbix.provider.protocol.bean.ZabbixProtocolType;
  import org.apache.skywalking.oap.server.receiver.zabbix.provider.protocol.bean.ZabbixRequest;
  import org.apache.skywalking.oap.server.receiver.zabbix.provider.protocol.bean.ZabbixResponse;
  
  import java.util.Collections;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  /**
   * Handle request on received the Zabbix data
   */
  @Slf4j
  public class ZabbixProtocolHandler extends SimpleChannelInboundHandler<ZabbixRequest> {
  
      private final ZabbixMetrics metrics;
  
      public ZabbixProtocolHandler(ZabbixMetrics metrics) {
          this.metrics = metrics;
      }
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, ZabbixRequest msg) {
          if (msg.getType() == ZabbixProtocolType.ACTIVE_CHECKS) {
              ZabbixResponse response = new ZabbixResponse();
              response.setType(msg.getType());
              String hostName = msg.getActiveChecks().getHostName();
  
              // Get all active tasks
              response.setActiveChecks(Optional.of(metrics.getAllMonitorMetricNames(hostName))
                  .map(s -> s.stream().map(key ->
                      ZabbixResponse.ActiveChecks.builder().delay(60).lastlogsize(0).key(key).mtime(0).build()
                  ).collect(Collectors.toList())).orElse(Collections.emptyList()));
  
              ctx.writeAndFlush(response);
          } else {
              ZabbixResponse response = new ZabbixResponse();
              response.setType(msg.getType());
  
              // Convert metrics to the meter system
              ZabbixMetrics.ConvertStatics convertStatics;
              try {
                  convertStatics = metrics.convertMetrics(msg.getAgentDataList());
              } catch (Exception e) {
                  log.warn("Convert the Zabbix metrics error", e);
                  convertStatics = ZabbixMetrics.ConvertStatics.builder().total(1).failed(1).build();
              }
  
              response.setAgentData(ZabbixResponse.AgentData.builder()
                  .info(String.format("processed: %d; failed: %d; total: %d; seconds spent: %f",
                      convertStatics.getSuccess(),
                      convertStatics.getFailed(),
                      convertStatics.getTotal(),
                      convertStatics.getUseTime()))
                  .build());
  
              ctx.writeAndFlush(response);
          }
      }
  }
  