/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.net;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.Socket;
import java.net.SocketAddress;

import ch.qos.logback.classic.Logger;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.ILoggingEvent;

// Contributors: Moses Hohman <mmhohman@rainbow.uchicago.edu>

/**
 * Read {@link ILoggingEvent} objects sent from a remote client using Sockets
 * (TCP). These logging events are logged according to local policy, as if they
 * were generated locally.
 * 
 * <p>
 * For example, the socket node might decide to log events to a local file and
 * also resent them to a second socket node.
 * 
 * @author Ceki G&uuml;lc&uuml;
 * @author S&eacute;bastien Pennec
 * 
 * @since 0.8.4
 */
public class SocketNode implements Runnable {

  Socket socket;
  LoggerContext context;
  ObjectInputStream ois;
  SocketAddress remoteSocketAddress;
  
  Logger logger;
  boolean closed = false;
  SimpleSocketServer socketServer;
  
  public SocketNode(SimpleSocketServer socketServer, Socket socket, LoggerContext context) {
    this.socketServer = socketServer;
    this.socket = socket;
    remoteSocketAddress = socket.getRemoteSocketAddress();
    this.context = context;
    logger = context.getLogger(SocketNode.class);
  }

  // public
  // void finalize() {
  // System.err.println("-------------------------Finalize called");
  // System.err.flush();
  // }

  public void run() {

    try {
      ois = new ObjectInputStream(new BufferedInputStream(socket
          .getInputStream()));
    } catch (Exception e) {
      logger.error("Could not open ObjectInputStream to " + socket, e);
      closed = true;
    }

    ILoggingEvent event;
    Logger remoteLogger;

    try {
      while (!closed) {
        // read an event from the wire
        event = (ILoggingEvent) ois.readObject();
        // get a logger from the hierarchy. The name of the logger is taken to
        // be the name contained in the event.
        remoteLogger = context.getLogger(event.getLoggerName());
        // apply the logger-level filter
        if (remoteLogger.isEnabledFor(event.getLevel())) {
          // finally log the event as if was generated locally
          remoteLogger.callAppenders(event);
        }
      }
    } catch (java.io.EOFException e) {
      logger.info("Caught java.io.EOFException closing connection.");
    } catch (java.net.SocketException e) {
      logger.info("Caught java.net.SocketException closing connection.");
    } catch (IOException e) {
      logger.info("Caught java.io.IOException: " + e);
      logger.info("Closing connection.");
    } catch (Exception e) {
      logger.error("Unexpected exception. Closing connection.", e);
    }

    socketServer.socketNodeClosing(this);
    close();
  }
  
  void close() {
    if(closed) {
      return;
    }
    closed = true;
    if (ois != null) {
      try {
        ois.close();
      } catch (IOException e) {
        logger.warn("Could not close connection.", e);
      } finally {
        ois = null;
      }
    }
  }
  
  @Override
  public String toString() {
    return this.getClass().getName()+remoteSocketAddress.toString();
  }
}
