mirror of
https://github.com/yacy/yacy_search_server.git
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89 lines
3.3 KiB
Java
89 lines
3.3 KiB
Java
/**
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* CrashProtectionHandler
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* Copyright 2026 by Michael Peter Christen
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* First released 12.07.2026 at https://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.http;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.eclipse.jetty.server.Handler;
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import org.eclipse.jetty.server.Request;
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import org.eclipse.jetty.server.Server;
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import org.eclipse.jetty.server.handler.HandlerWrapper;
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import net.yacy.cora.util.ConcurrentLog;
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/**
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* Last-resort exception barrier wrapped around the complete handler chain.
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*
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* Note for servlet container migration: this must stay a container level
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* handler (it can not become a servlet filter): inside the servlet context a
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* filter would catch servlet exceptions before the containers error dispatch
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* and thereby replace the YaCyErrorHandler error page with a plain text stack
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* trace. Its purpose is to catch failures outside the servlet context, e.g.
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* in the transparent proxy handlers.
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*/
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public class CrashProtectionHandler extends HandlerWrapper implements Handler {
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public CrashProtectionHandler() {
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super();
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}
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public CrashProtectionHandler(Server s, Handler h) {
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super();
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this.setServer(s);
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this.setHandler(h);
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}
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@Override
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public void handle(String target, Request baseRequest, HttpServletRequest request,
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HttpServletResponse response) throws IOException, ServletException {
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try {
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super.handle(target, baseRequest, request, response);
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} catch (Exception e) {
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ConcurrentLog.severe("HTTP", "event=http.request subsystem=http result=exception method=" + request.getMethod() +
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" target=" + target + " status=500 reason=" + e.getMessage());
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// handle all we can
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writeResponse(request, response, e);
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baseRequest.setHandled(true);
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}
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}
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private void writeResponse(@SuppressWarnings("unused") HttpServletRequest request, HttpServletResponse response, Exception exc) throws IOException {
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PrintWriter out;
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try { // prevent exception after partial response (only getWriter not allowed if getOutputStream called before; Servlet API 3.0 )
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out = response.getWriter();
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} catch (IllegalStateException e) {
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out = new PrintWriter(response.getOutputStream());
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}
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out.println("Ops!");
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out.println();
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out.println("Message: " + exc.getMessage());
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exc.printStackTrace(out);
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response.setContentType("text/plain");
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response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
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}
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}
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