DebugHandler

//
//  ========================================================================
//  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.server.handler;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Locale;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.server.AbstractConnector;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Response;
import org.eclipse.jetty.util.DateCache;
import org.eclipse.jetty.util.RolloverFileOutputStream;


/**
 * Debug Handler.
 * A lightweight debug handler that can be used in production code.
 * Details of the request and response are written to an output stream
 * and the current thread name is updated with information that will link
 * to the details in that output.
 */
public class DebugHandler extends HandlerWrapper implements Connection.Listener
{
    private DateCache _date=new DateCache("HH:mm:ss", Locale.US);
    private OutputStream _out;
    private PrintStream _print;

    /* ------------------------------------------------------------ */
    /*
     * @see org.eclipse.jetty.server.Handler#handle(java.lang.String, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
     */
    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException
    {
        final Response base_response = baseRequest.getResponse();
        final Thread thread=Thread.currentThread();
        final String old_name=thread.getName();

        boolean suspend=false;
        boolean retry=false;
        String name=(String)request.getAttribute("org.eclipse.jetty.thread.name");
        if (name==null)
            name=old_name+":"+baseRequest.getScheme()+"://"+baseRequest.getLocalAddr()+":"+baseRequest.getLocalPort()+baseRequest.getUri();
        else
            retry=true;

        String ex=null;
        try
        {
            if (retry)
                print(name,"RESUME");
            else
                print(name,"REQUEST "+baseRequest.getRemoteAddr()+" "+request.getMethod()+" "+baseRequest.getHeader("Cookie")+"; "+baseRequest.getHeader("User-Agent"));
            thread.setName(name);

            getHandler().handle(target,baseRequest,request,response);
        }
        catch(IOException ioe)
        {
            ex=ioe.toString();
            throw ioe;
        }
        catch(ServletException se)
        {
            ex=se.toString()+":"+se.getCause();
            throw se;
        }
        catch(RuntimeException rte)
        {
            ex=rte.toString();
            throw rte;
        }
        catch(Error e)
        {
            ex=e.toString();
            throw e;
        }
        finally
        {
            thread.setName(old_name);
            suspend=baseRequest.getHttpChannelState().isSuspended();
            if (suspend)
            {
                request.setAttribute("org.eclipse.jetty.thread.name",name);
                print(name,"SUSPEND");
            }
            else
                print(name,"RESPONSE "+base_response.getStatus()+(ex==null?"":("/"+ex))+" "+base_response.getContentType());
        }
    }

    private void print(String name,String message)
    {
        long now=System.currentTimeMillis();
        final String d=_date.format(now);
        final int ms=(int)(now%1000);

        _print.println(d+(ms>99?".":(ms>9?".0":".00"))+ms+":"+name+" "+message);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jetty.server.handler.HandlerWrapper#doStart()
     */
    @Override
    protected void doStart() throws Exception
    {
        if (_out==null)
            _out=new RolloverFileOutputStream("./logs/yyyy_mm_dd.debug.log",true);
        _print=new PrintStream(_out);

        for (Connector connector : getServer().getConnectors())
            if (connector instanceof AbstractConnector)
                ((AbstractConnector)connector).addBean(this,false);

        super.doStart();
    }

    /* (non-Javadoc)
     * @see org.eclipse.jetty.server.handler.HandlerWrapper#doStop()
     */
    @Override
    protected void doStop() throws Exception
    {
        super.doStop();
        _print.close();
        for (Connector connector : getServer().getConnectors())
            if (connector instanceof AbstractConnector)
                ((AbstractConnector)connector).removeBean(this);
    }

    /**
     * @return the out
     */
    public OutputStream getOutputStream()
    {
        return _out;
    }

    /**
     * @param out the out to set
     */
    public void setOutputStream(OutputStream out)
    {
        _out = out;
    }

    @Override
    public void onOpened(Connection connection)
    {
        print(Thread.currentThread().getName(),"OPENED "+connection.toString());
    }

    @Override
    public void onClosed(Connection connection)
    {
        print(Thread.currentThread().getName(),"CLOSED "+connection.toString());
    }

}