net.sf.hajdbc.state.health.observer.NetworkDetectObserveAdapter Maven / Gradle / Ivy

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High-Availability JDBC
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package net.sf.hajdbc.state.health.observer;

import net.sf.hajdbc.logging.Level;
import net.sf.hajdbc.logging.Logger;
import net.sf.hajdbc.logging.LoggerFactory;
import net.sf.hajdbc.util.FileReader;
import net.sf.hajdbc.util.Tracer;

import java.net.InetAddress;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * Observe adapter for network delay detect
 */
public class NetworkDetectObserveAdapter implements ObserveAdapter {
  static final Logger logger = LoggerFactory.getLogger(NetworkDetectObserveAdapter.class);

  public static final int TIME_OUT = 60;

  private static final FileReader detectModeFileReader = FileReader.of2("net-delay-detect", s-> DetectMode.of(s));

  private final FileReader detectTimeout = FileReader.of4int("net-delay-detect.timeout");

  @Override
  public String getName() {
    return "net-delay-detect";
  }

  @Override
  public int getWeight() {
    return 80;
  }

  @Override
  public boolean isObservable(boolean needDown, String localIp, List ips) {
    DetectMode detectMode = getDetectMode();
    if(!DetectMode.disabled.equals(detectMode)) {
      List tcpLinks = TcpLink.readTcpLinks("/proc/net/tcp");
      Set ips1 = new HashSet<>(tcpLinks.stream().filter(e -> e.getLocal().getIp().equals(localIp)
              && !e.getRemote().getIp().equals(localIp))
          .map(e -> e.getRemote().getIp())
          .collect(Collectors.toList()));
      ips1.removeIf(ip -> ips.contains(ip));
      Set ips2 = ips1.stream().limit(5).collect(Collectors.toSet());
      List remoteNodes = new ArrayList<>(ips);
      remoteNodes.removeIf(ip -> localIp.equals(ip));
      if (Tracer.observe.isTrace()) {
        logger.log(Level.INFO, "remoteNodes={0} ips2={1}", remoteNodes, ips2);
      }
      //配置节点通信状态
      boolean nodeOk = false;
      for (String remoteNode : remoteNodes) {
        if (isHostReachable(remoteNode, getTimeOut(needDown))) {
          nodeOk = true;
          break;
        }
      }


      //配置节点通信状态都异常,最小必需有1个可探测节点
      if (!nodeOk&&ips2.size() >= 1) {
        int success = 0;
        int fail = 0;
        for (String ip : ips2) {
          if (isHostReachable(ip, getTimeOut(needDown))) {
            success++;
          } else {
            fail++;
          }
        }
        if (Tracer.observe.isTrace()) {
          logger.log(Level.INFO, "success={0} fail={1}", success, fail);
        }
        if (DetectMode.half.equals(detectMode)) {
          return success >= fail;
        } else {
          return fail < ips2.size();
        }
      }
    }
    return true;
  }

  @Override
  public boolean isOptional() {
    return false;
  }

  private int getTimeOut(boolean needDown) {
    synchronized (detectTimeout) {
      int timeout = detectTimeout
          .getData(TIME_OUT);
      if (timeout < 20) {
        timeout = 20;
      }
      if (timeout > 100) {
        timeout = 100;
      }
      if (!needDown) {
        timeout -= 15;
      }
      return timeout;
    }
  }

  private boolean isHostReachable(String host, int timeOut) {
    boolean reachable = false;
    try {
      reachable = InetAddress.getByName(host).isReachable(timeOut);
    } catch (Exception e) {
      e.printStackTrace();
    }
    if (Tracer.observe.isTrace()) {
      if(reachable){
        logger.log(Level.INFO, "detect delay {0} success.", host);
      }else{
        logger.log(Level.INFO, "detect delay {0} fail.", host);
      }
    }
    return reachable;
  }

  public static DetectMode getDetectMode() {
    DetectMode detectMode = detectModeFileReader
        .getData(DetectMode.all, DetectMode.disabled);
    return detectMode;
  }

}