chris@1: /*
chris@1:  *   SONEWS News Server
chris@1:  *   see AUTHORS for the list of contributors
chris@1:  *
chris@1:  *   This program is free software: you can redistribute it and/or modify
chris@1:  *   it under the terms of the GNU General Public License as published by
chris@1:  *   the Free Software Foundation, either version 3 of the License, or
chris@1:  *   (at your option) any later version.
chris@1:  *
chris@1:  *   This program is distributed in the hope that it will be useful,
chris@1:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1:  *   GNU General Public License for more details.
chris@1:  *
chris@1:  *   You should have received a copy of the GNU General Public License
chris@1:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1:  */
chris@1: 
chris@1: package org.sonews.web;
chris@1: 
chris@1: import info.monitorenter.gui.chart.ITrace2D;
chris@1: import info.monitorenter.gui.chart.traces.Trace2DSimple;
chris@1: import java.io.IOException;
chris@1: import javax.servlet.http.HttpServletRequest;
chris@1: import javax.servlet.http.HttpServletResponse;
chris@1: 
chris@1: /**
chris@1:  * Servlet that creates chart images and returns them as raw PNG images.
chris@1:  * @author Christian Lins
chris@1:  * @since sonews/0.5.0
chris@1:  */
chris@1: public class SonewsChartServlet extends AbstractSonewsServlet
chris@1: {
chris@1:   
chris@1:   private ITrace2D createProcessMails24(String title, String cmd)
chris@1:     throws IOException
chris@1:   {
chris@1:     int[] data = read24Values(cmd);
chris@1:     ITrace2D trace = new Trace2DSimple(title);
chris@1:     trace.addPoint(0.0, 0.0); // Start
chris@1:     
chris@1:     for(int n = 0; n < 24; n++)
chris@1:     {
chris@1:       trace.addPoint(n, data[n]);
chris@1:     }
chris@1: 
chris@1:     return trace;
chris@1:   }
chris@1:   
chris@1:   @Override
chris@1:   public void doGet(HttpServletRequest req, HttpServletResponse resp)
chris@1:     throws IOException
chris@1:   {
chris@1:     synchronized(this)
chris@1:     {
chris@1:       MemoryBitmapChart chart = new MemoryBitmapChart();
chris@1: 
chris@1:       String name  = req.getParameter("name");
chris@1:       String group = req.getParameter("group");
chris@1:       ITrace2D trace;
chris@1:       String   cmd = "XDAEMON LOG";
chris@1: 
chris@1:       if(name.equals("feedednewsyesterday"))
chris@1:       {
chris@1:         cmd = cmd + " TRANSMITTED_NEWS";
chris@1:         cmd = group != null ? cmd + " " + group : cmd;
chris@1:         trace = createProcessMails24(
chris@1:           "To peers transmitted mails yesterday", cmd);
chris@1:       }
chris@1:       else if(name.equals("gatewayednewsyesterday"))
chris@1:       {
chris@1:         cmd = cmd + " GATEWAYED_NEWS";
chris@1:         cmd = group != null ? cmd + " " + group : cmd;
chris@1:         trace = createProcessMails24(
chris@1:           "Gatewayed mails yesterday", cmd);
chris@1:       }
chris@1:       else
chris@1:       {
chris@1:         cmd = cmd + " POSTED_NEWS";
chris@1:         cmd = group != null ? cmd + " " + group : cmd;
chris@1:         trace = createProcessMails24(
chris@1:           "Posted mails yesterday", cmd);
chris@1:       }
chris@1:       chart.addTrace(trace);
chris@1: 
chris@1:       resp.getOutputStream().write(chart.getRawData(500, 400));
chris@1:       resp.setContentType(chart.getContentType());
chris@1:       resp.setStatus(HttpServletResponse.SC_OK);
chris@1:     }
chris@1:   }
chris@1:   
chris@1:   private int[] read24Values(String command)
chris@1:     throws IOException
chris@1:   {
chris@1:     int[] values = new int[24];
chris@1:     connectToNewsserver();
chris@1:     printlnToNewsserver(command);
chris@1:     String line = readlnFromNewsserver();
chris@1:     if(!line.startsWith("200 "))
chris@1:       throw new IOException(command + " not supported!");
chris@1:     
chris@1:     for(int n = 0; n < 24; n++)
chris@1:     {
chris@1:       line = readlnFromNewsserver();
chris@1:       values[n] = Integer.parseInt(line.split(" ")[1]);
chris@1:     }
chris@1:     
chris@1:     line = readlnFromNewsserver(); // "."
chris@1:     
chris@1:     disconnectFromNewsserver();
chris@1:     return values;
chris@1:   }
chris@1:   
chris@1: }