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/*
* Copyright 2019, Continual.io
*
* 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 io.continual.http.service.framework;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import javax.servlet.ServletContext;
import org.apache.catalina.Context;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleState;
import org.apache.catalina.Loader;
import org.apache.catalina.Session;
import org.apache.catalina.session.ManagerBase;
import org.apache.catalina.session.StandardSession;
import org.apache.catalina.util.CustomObjectInputStream;
import org.apache.juli.logging.Log;
import org.apache.tomcat.util.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import io.continual.util.nv.NvReadable;
public class CHttpSessionManager extends ManagerBase
{
public CHttpSessionManager ( NvReadable settings )
{
super ();
}
/**
* The descriptive name of this Manager implementation (for logging).
*/
protected static final String name = "CHttpSessionManager";
/**
* Path name of the disk file in which active sessions are saved
* when we stop, and from which these sessions are loaded when we start.
* A null value indicates that no persistence is desired.
* If this pathname is relative, it will be resolved against the
* temporary working directory provided by our context, available via
* the javax.servlet.context.tempdir context attribute.
*/
protected String pathname = "SESSIONS.ser";
@Override
public String getName() {
return name;
}
/**
* @return The session persistence pathname, if any.
*/
public String getPathname() {
return pathname;
}
/**
* Set the session persistence pathname to the specified value. If no
* persistence support is desired, set the pathname to null.
*
* @param pathname New session persistence pathname
*/
public void setPathname(String pathname) {
String oldPathname = this.pathname;
this.pathname = pathname;
support.firePropertyChange("pathname", oldPathname, this.pathname);
}
// --------------------------------------------------------- Public Methods
@SuppressWarnings("deprecation")
@Override
public void load() throws ClassNotFoundException, IOException {
if (log.isDebugEnabled()) {
log.debug("Start: Loading persisted sessions");
}
// Initialize our internal data structures
sessions.clear();
// Open an input stream to the specified pathname, if any
File file = file();
if (file == null) {
return;
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("standardManager.loading", pathname));
}
Loader loader = null;
ClassLoader classLoader = null;
Log logger = null;
try (FileInputStream fis = new FileInputStream(file.getAbsolutePath());
BufferedInputStream bis = new BufferedInputStream(fis)) {
Context c = getContext();
loader = c.getLoader();
logger = c.getLogger();
if (loader != null) {
classLoader = loader.getClassLoader();
}
if (classLoader == null) {
classLoader = getClass().getClassLoader();
}
// Load the previously unloaded active sessions
synchronized (sessions) {
try (ObjectInputStream ois = new CustomObjectInputStream(bis, classLoader, logger,
getSessionAttributeValueClassNamePattern(),
getWarnOnSessionAttributeFilterFailure())) {
Integer count = (Integer) ois.readObject();
int n = count.intValue();
if (log.isDebugEnabled())
log.debug("Loading " + n + " persisted sessions");
for (int i = 0; i < n; i++) {
StandardSession session = getNewSession();
session.readObjectData(ois);
session.setManager(this);
sessions.put(session.getIdInternal(), session);
session.activate();
// if (!session.isValidInternal()) {
// // If session is already invalid,
// // expire session to prevent memory leak.
// session.setValid(true);
// session.expire();
// }
sessionCounter++;
}
} finally {
// Delete the persistent storage file
if (file.exists()) {
file.delete();
}
}
}
} catch (FileNotFoundException e) {
if (log.isDebugEnabled()) {
log.debug("No persisted data file found");
}
return;
}
if (log.isDebugEnabled()) {
log.debug("Finish: Loading persisted sessions");
}
}
@Override
public void unload() throws IOException {
if (log.isDebugEnabled())
log.debug(sm.getString("standardManager.unloading.debug"));
if (sessions.isEmpty()) {
log.debug(sm.getString("standardManager.unloading.nosessions"));
return; // nothing to do
}
// Open an output stream to the specified pathname, if any
File file = file();
if (file == null) {
return;
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("standardManager.unloading", pathname));
}
// Keep a note of sessions that are expired
ArrayList list = new ArrayList<>();
try (FileOutputStream fos = new FileOutputStream(file.getAbsolutePath());
BufferedOutputStream bos = new BufferedOutputStream(fos);
ObjectOutputStream oos = new ObjectOutputStream(bos)) {
synchronized (sessions) {
if (log.isDebugEnabled()) {
log.debug("Unloading " + sessions.size() + " sessions");
}
// Write the number of active sessions, followed by the details
oos.writeObject(Integer.valueOf(sessions.size()));
Iterator elements = sessions.values().iterator();
while (elements.hasNext()) {
StandardSession session =
(StandardSession) elements.next();
list.add(session);
session.passivate();
session.writeObjectData(oos);
}
}
}
// Expire all the sessions we just wrote
if (log.isDebugEnabled()) {
log.debug("Expiring " + list.size() + " persisted sessions");
}
Iterator expires = list.iterator();
while (expires.hasNext()) {
StandardSession session = expires.next();
try {
session.expire(false);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
} finally {
session.recycle();
}
}
if (log.isDebugEnabled()) {
log.debug("Unloading complete");
}
}
/**
* Start this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#startInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void startInternal() throws LifecycleException {
super.startInternal();
// Load unloaded sessions, if any
try {
load();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("standardManager.managerLoad"), t);
}
setState(LifecycleState.STARTING);
}
/**
* Stop this component and implement the requirements
* of {@link org.apache.catalina.util.LifecycleBase#stopInternal()}.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
@Override
protected synchronized void stopInternal() throws LifecycleException {
if (log.isDebugEnabled()) {
log.debug("Stopping");
}
setState(LifecycleState.STOPPING);
// Write out sessions
try {
unload();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("standardManager.managerUnload"), t);
}
// Expire all active sessions
Session sessions[] = findSessions();
for (int i = 0; i < sessions.length; i++) {
Session session = sessions[i];
try {
if (session.isValid()) {
session.expire();
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
} finally {
// Measure against memory leaking if references to the session
// object are kept in a shared field somewhere
session.recycle();
}
}
// Require a new random number generator if we are restarted
super.stopInternal();
}
// ------------------------------------------------------ Protected Methods
/**
* Return a File object representing the pathname to our
* persistence file, if any.
*/
protected File file() {
if (pathname == null || pathname.length() == 0) {
return null;
}
File file = new File(pathname);
if (!file.isAbsolute()) {
Context context = getContext();
ServletContext servletContext = context.getServletContext();
File tempdir = (File) servletContext.getAttribute(ServletContext.TEMPDIR);
if (tempdir != null) {
file = new File(tempdir, pathname);
}
}
return file;
}
private static final Logger log = LoggerFactory.getLogger ( CHttpSessionManager.class );
}
