| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gerrit.httpd; |
| |
| import com.google.inject.Inject; |
| import com.google.inject.Module; |
| import com.google.inject.Singleton; |
| import com.google.inject.servlet.ServletModule; |
| import java.io.IOException; |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletResponse; |
| import javax.servlet.http.HttpServletResponseWrapper; |
| |
| @Singleton |
| public class RequestMetricsFilter implements Filter { |
| public static Module module() { |
| return new ServletModule() { |
| @Override |
| protected void configureServlets() { |
| filter("/*").through(RequestMetricsFilter.class); |
| } |
| }; |
| } |
| |
| private final RequestMetrics metrics; |
| |
| @Inject |
| RequestMetricsFilter(RequestMetrics metrics) { |
| this.metrics = metrics; |
| } |
| |
| @Override |
| public void destroy() {} |
| |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) |
| throws IOException, ServletException { |
| Response rsp = new Response((HttpServletResponse) response, metrics); |
| |
| chain.doFilter(request, rsp); |
| } |
| |
| @Override |
| public void init(FilterConfig cfg) throws ServletException {} |
| |
| private static class Response extends HttpServletResponseWrapper { |
| private final RequestMetrics metrics; |
| |
| Response(HttpServletResponse response, RequestMetrics metrics) { |
| super(response); |
| this.metrics = metrics; |
| } |
| |
| @Override |
| public void sendError(int sc, String msg) throws IOException { |
| status(sc); |
| super.sendError(sc, msg); |
| } |
| |
| @Override |
| public void sendError(int sc) throws IOException { |
| status(sc); |
| super.sendError(sc); |
| } |
| |
| @Override |
| @Deprecated |
| public void setStatus(int sc, String sm) { |
| status(sc); |
| super.setStatus(sc, sm); |
| } |
| |
| @Override |
| public void setStatus(int sc) { |
| status(sc); |
| super.setStatus(sc); |
| } |
| |
| private void status(int sc) { |
| if (sc >= SC_BAD_REQUEST) { |
| metrics.errors.increment(sc); |
| } else { |
| metrics.successes.increment(sc); |
| } |
| } |
| } |
| } |