/*
* Copyright 1999-2011 Alibaba Group Holding Ltd.
*
* 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.alibaba.druid.support.http;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
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;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import com.alibaba.druid.filter.stat.StatFilterContext;
import com.alibaba.druid.support.http.stat.WebAppStat;
import com.alibaba.druid.support.http.stat.WebAppStatManager;
import com.alibaba.druid.support.http.stat.WebRequestStat;
import com.alibaba.druid.support.http.stat.WebSessionStat;
import com.alibaba.druid.support.http.stat.WebURIStat;
import com.alibaba.druid.support.logging.Log;
import com.alibaba.druid.support.logging.LogFactory;
import com.alibaba.druid.support.profile.ProfileEntryKey;
import com.alibaba.druid.support.profile.ProfileEntryReqStat;
import com.alibaba.druid.support.profile.Profiler;
import com.alibaba.druid.util.DruidWebUtils;
import com.alibaba.druid.util.PatternMatcher;
import com.alibaba.druid.util.ServletPathMatcher;
/**
* 用于配置Web和Druid数据源之间的管理关联监控统计
*
* @author wenshao <szujobs@htomail.com>
* @author Zhangming Qi <qizhanming@gmail.com>
*/
public class WebStatFilter extends AbstractWebStatImpl implements Filter {
private final static Log LOG = LogFactory.getLog(WebStatFilter.class);
public final static String PARAM_NAME_PORFILE_ENABLE = "profileEnable";
public final static String PARAM_NAME_SESSION_STAT_ENABLE = "sessionStatEnable";
public final static String PARAM_NAME_SESSION_STAT_MAX_COUNT = "sessionStatMaxCount";
public static final String PARAM_NAME_EXCLUSIONS = "exclusions";
public static final String PARAM_NAME_PRINCIPAL_SESSION_NAME = "principalSessionName";
public static final String PARAM_NAME_PRINCIPAL_COOKIE_NAME = "principalCookieName";
public static final String PARAM_NAME_REAL_IP_HEADER = "realIpHeader";
/**
* PatternMatcher used in determining which paths to react to for a given request.
*/
protected PatternMatcher pathMatcher = new ServletPathMatcher();
private Set<String> excludesPattern;
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
HttpServletResponse httpResponse = (HttpServletResponse) response;
StatHttpServletResponseWrapper responseWrapper = new StatHttpServletResponseWrapper(httpResponse);
String requestURI = getRequestURI(httpRequest);
if (isExclusion(requestURI)) {
chain.doFilter(request, response);
return;
}
long startNano = System.nanoTime();
long startMillis = System.currentTimeMillis();
WebRequestStat requestStat = new WebRequestStat(startNano, startMillis);
WebRequestStat.set(requestStat);
WebSessionStat sessionStat = getSessionStat(httpRequest);
webAppStat.beforeInvoke();
WebURIStat uriStat = webAppStat.getURIStat(requestURI, false);
if (uriStat == null) {
int index = requestURI.indexOf(";jsessionid=");
if (index != -1) {
requestURI = requestURI.substring(0, index);
uriStat = webAppStat.getURIStat(requestURI, false);
}
}
if (isProfileEnable()) {
Profiler.initLocal();
Profiler.enter(requestURI, Profiler.PROFILE_TYPE_WEB);
}
// 第一次访问时，uriStat这里为null，是为了防止404攻击。
if (uriStat != null) {
uriStat.beforeInvoke();
}
// 第一次访问时，sessionId为null，如果缺省sessionCreate=false，sessionStat就为null。
if (sessionStat != null) {
sessionStat.beforeInvoke();
}
Throwable error = null;
try {
chain.doFilter(request, responseWrapper);
} catch (IOException e) {
error = e;
throw e;
} catch (ServletException e) {
error = e;
throw e;
} catch (RuntimeException e) {
error = e;
throw e;
} catch (Error e) {
error = e;
throw e;
} finally {
long endNano = System.nanoTime();
requestStat.setEndNano(endNano);
long nanos = endNano - startNano;
webAppStat.afterInvoke(error, nanos);
if (sessionStat == null) {
sessionStat = getSessionStat(httpRequest);
if (sessionStat != null) {
sessionStat.beforeInvoke(); // 补偿
}
}
if (sessionStat != null) {
sessionStat.afterInvoke(error, nanos);
sessionStat.setPrincipal(getPrincipal(httpRequest));
}
if (uriStat == null) {
int status = responseWrapper.getStatus();
if (status == HttpServletResponse.SC_NOT_FOUND) {
String errorUrl = contextPath + "error_" + status;
uriStat = webAppStat.getURIStat(errorUrl, true);
} else {
uriStat = webAppStat.getURIStat(requestURI, true);
}
if (uriStat != null) {
uriStat.beforeInvoke(); // 补偿调用
}
}
if (uriStat != null) {
uriStat.afterInvoke(error, nanos);
}
WebRequestStat.set(null);
if (isProfileEnable()) {
Profiler.release(nanos);
Map<ProfileEntryKey, ProfileEntryReqStat> requestStatsMap = Profiler.getStatsMap();
if (uriStat != null) {
uriStat.getProfiletat().record(requestStatsMap);
}
Profiler.removeLocal();
}
}
}
public boolean isExclusion(String requestURI) {
if (excludesPattern == null) {
return false;
}
if (contextPath != null && requestURI.startsWith(contextPath)) {
requestURI = requestURI.substring(contextPath.length());
if (!requestURI.startsWith("/")) {
requestURI = "/" + requestURI;
}
}
for (String pattern : excludesPattern) {
if (pathMatcher.matches(pattern, requestURI)) {
return true;
}
}
return false;
}
@Override
public void init(FilterConfig config) throws ServletException {
{
String exclusions = config.getInitParameter(PARAM_NAME_EXCLUSIONS);
if (exclusions != null && exclusions.trim().length() != 0) {
excludesPattern = new HashSet<String>(Arrays.asList(exclusions.split("\\s*,\\s*")));
}
}
{
String param = config.getInitParameter(PARAM_NAME_PRINCIPAL_SESSION_NAME);
if (param != null) {
param = param.trim();
if (param.length() != 0) {
this.principalSessionName = param;
}
}
}
{
String param = config.getInitParameter(PARAM_NAME_PRINCIPAL_COOKIE_NAME);
if (param != null) {
param = param.trim();
if (param.length() != 0) {
this.principalCookieName = param;
}
}
}
{
String param = config.getInitParameter(PARAM_NAME_SESSION_STAT_ENABLE);
if (param != null && param.trim().length() != 0) {
param = param.trim();
if ("true".equals(param)) {
this.sessionStatEnable = true;
} else if ("false".equals(param)) {
this.sessionStatEnable = false;
} else {
LOG.error("WebStatFilter Parameter '" + PARAM_NAME_SESSION_STAT_ENABLE + "' config error");
}
}
}
{
String param = config.getInitParameter(PARAM_NAME_PORFILE_ENABLE);
if (param != null && param.trim().length() != 0) {
param = param.trim();
if ("true".equals(param)) {
this.profileEnable = true;
} else if ("false".equals(param)) {
this.profileEnable = false;
} else {
LOG.error("WebStatFilter Parameter '" + PARAM_NAME_PORFILE_ENABLE + "' config error");
}
}
}
{
String param = config.getInitParameter(PARAM_NAME_SESSION_STAT_MAX_COUNT);
if (param != null && param.trim().length() != 0) {
param = param.trim();
try {
this.sessionStatMaxCount = Integer.parseInt(param);
} catch (NumberFormatException e) {
LOG.error("WebStatFilter Parameter '" + PARAM_NAME_SESSION_STAT_ENABLE + "' config error", e);
}
}
}
// realIpHeader
{
String param = config.getInitParameter(PARAM_NAME_REAL_IP_HEADER);
if (param != null) {
param = param.trim();
if (param.length() != 0) {
this.realIpHeader = param;
}
}
}
StatFilterContext.getInstance().addContextListener(statFilterContextListener);
this.contextPath = DruidWebUtils.getContextPath(config.getServletContext());
if (webAppStat == null) {
webAppStat = new WebAppStat(contextPath, this.sessionStatMaxCount);
}
WebAppStatManager.getInstance().addWebAppStatSet(webAppStat);
}
@Override
public void destroy() {
StatFilterContext.getInstance().removeContextListener(statFilterContextListener);
if (webAppStat != null) {
WebAppStatManager.getInstance().remove(webAppStat);
}
}
public void setWebAppStat(WebAppStat webAppStat) {
this.webAppStat = webAppStat;
}
public WebAppStat getWebAppStat() {
return webAppStat;
}
public WebStatFilterContextListener getStatFilterContextListener() {
return statFilterContextListener;
}
public final static class StatHttpServletResponseWrapper extends HttpServletResponseWrapper implements HttpServletResponse {
private int status;
public StatHttpServletResponseWrapper(HttpServletResponse response){
super(response);
}
public void setStatus(int statusCode) {
super.setStatus(statusCode);
this.status = statusCode;
}
public void setStatus(int statusCode, String statusMessage) {
super.setStatus(statusCode, statusMessage);
this.status = statusCode;
}
public void sendError(int statusCode, String statusMessage) throws IOException {
super.sendError(statusCode, statusMessage);
this.status = statusCode;
}
public void sendError(int statusCode) throws IOException {
super.sendError(statusCode);
this.status = statusCode;
}
public int getStatus() {
return status;
}
}
}