com.google.gerrit.httpd.SetThreadNameFilter Maven / Gradle / Ivy
// Copyright (C) 2020 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.gerrit.server.CurrentUser;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.Provider;
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.HttpServletRequest;
@Singleton
public class SetThreadNameFilter implements Filter {
private static final int MAX_PATH_LENGTH = 120;
public static Module module() {
return new ServletModule() {
@Override
protected void configureServlets() {
filter("/*").through(SetThreadNameFilter.class);
}
};
}
private final Provider user;
@Inject
public SetThreadNameFilter(Provider user) {
this.user = user;
}
@Override
public void init(FilterConfig filterConfig) {}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
Thread current = Thread.currentThread();
String old = current.getName();
try {
current.setName(computeName((HttpServletRequest) request));
chain.doFilter(request, response);
} finally {
current.setName(old);
}
}
private String computeName(HttpServletRequest req) {
StringBuilder s = new StringBuilder();
s.append("HTTP ");
s.append(req.getMethod());
s.append(" ");
s.append(req.getRequestURI());
String query = req.getQueryString();
if (query != null) {
s.append("?").append(query);
}
if (s.length() > MAX_PATH_LENGTH) {
s.delete(MAX_PATH_LENGTH, s.length());
}
s.append(" (");
s.append(user.get().getUserName().orElse("N/A"));
s.append(" from ");
s.append(req.getRemoteAddr());
s.append(")");
return s.toString();
}
@Override
public void destroy() {}
}