/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tomcat.websocket.server;
import java.io.EOFException;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpSession;
import javax.websocket.CloseReason;
import javax.websocket.CloseReason.CloseCodes;
import javax.websocket.DeploymentException;
import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.Extension;
import org.apache.coyote.http11.upgrade.AbstractServletInputStream;
import org.apache.coyote.http11.upgrade.AbstractServletOutputStream;
import org.apache.coyote.http11.upgrade.servlet31.HttpUpgradeHandler;
import org.apache.coyote.http11.upgrade.servlet31.ReadListener;
import org.apache.coyote.http11.upgrade.servlet31.WebConnection;
import org.apache.coyote.http11.upgrade.servlet31.WriteListener;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
import org.apache.tomcat.websocket.Transformation;
import org.apache.tomcat.websocket.WsIOException;
import org.apache.tomcat.websocket.WsSession;
/**
* Servlet 3.1 HTTP upgrade handler for WebSocket connections.
*/
public class WsHttpUpgradeHandler implements HttpUpgradeHandler {
private static final Log log =
LogFactory.getLog(WsHttpUpgradeHandler.class);
private static final StringManager sm =
StringManager.getManager(Constants.PACKAGE_NAME);
private final ClassLoader applicationClassLoader;
private Endpoint ep;
private EndpointConfig endpointConfig;
private WsServerContainer webSocketContainer;
private WsHandshakeRequest handshakeRequest;
private List<Extension> negotiatedExtensions;
private String subProtocol;
private Transformation transformation;
private Map<String,String> pathParameters;
private boolean secure;
private WebConnection connection;
private WsSession wsSession;
public WsHttpUpgradeHandler() {
applicationClassLoader = Thread.currentThread().getContextClassLoader();
}
public void preInit(Endpoint ep, EndpointConfig endpointConfig,
WsServerContainer wsc, WsHandshakeRequest handshakeRequest,
List<Extension> negotiatedExtensionsPhase2, String subProtocol,
Transformation transformation, Map<String,String> pathParameters,
boolean secure) {
this.ep = ep;
this.endpointConfig = endpointConfig;
this.webSocketContainer = wsc;
this.handshakeRequest = handshakeRequest;
this.negotiatedExtensions = negotiatedExtensionsPhase2;
this.subProtocol = subProtocol;
this.transformation = transformation;
this.pathParameters = pathParameters;
this.secure = secure;
}
@Override
public void init(WebConnection connection) {
if (ep == null) {
throw new IllegalStateException(
sm.getString("wsHttpUpgradeHandler.noPreInit"));
}
this.connection = connection;
AbstractServletInputStream sis;
AbstractServletOutputStream sos;
try {
sis = connection.getInputStream();
sos = connection.getOutputStream();
} catch (IOException e) {
throw new IllegalStateException(e);
}
String httpSessionId = null;
Object session = handshakeRequest.getHttpSession();
if (session != null ) {
httpSessionId = ((HttpSession) session).getId();
}
// Need to call onOpen using the web application's class loader
// Create the frame using the application's class loader so it can pick
// up application specific config from the ServerContainerImpl
Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
t.setContextClassLoader(applicationClassLoader);
try {
WsRemoteEndpointImplServer wsRemoteEndpointServer =
new WsRemoteEndpointImplServer(sos, webSocketContainer);
wsSession = new WsSession(ep, wsRemoteEndpointServer,
webSocketContainer, handshakeRequest.getRequestURI(),
handshakeRequest.getParameterMap(),
handshakeRequest.getQueryString(),
handshakeRequest.getUserPrincipal(), httpSessionId,
negotiatedExtensions, subProtocol, pathParameters, secure,
endpointConfig);
WsFrameServer wsFrame = new WsFrameServer(sis, wsSession, transformation);
sos.setWriteListener(new WsWriteListener(this, wsRemoteEndpointServer));
// WsFrame adds the necessary final transformations. Copy the
// completed transformation chain to the remote end point.
wsRemoteEndpointServer.setTransformation(wsFrame.getTransformation());
ep.onOpen(wsSession, endpointConfig);
webSocketContainer.registerSession(ep, wsSession);
sis.setReadListener(new WsReadListener(this, wsFrame));
} catch (DeploymentException e) {
throw new IllegalArgumentException(e);
} finally {
t.setContextClassLoader(cl);
}
}
@Override
public void destroy() {
if (connection != null) {
try {
connection.close();
} catch (Exception e) {
log.error(sm.getString("wsHttpUpgradeHandler.destroyFailed"), e);
}
}
}
private void onError(Throwable throwable) {
// Need to call onError using the web application's class loader
Thread t = Thread.currentThread();
ClassLoader cl = t.getContextClassLoader();
t.setContextClassLoader(applicationClassLoader);
try {
ep.onError(wsSession, throwable);
} finally {
t.setContextClassLoader(cl);
}
}
private void close(CloseReason cr) {
/*
* Any call to this method is a result of a problem reading from the
* client. At this point that state of the connection is unknown.
* Attempt to send a close frame to the client and then close the socket
* immediately. There is no point in waiting for a close frame from the
* client because there is no guarantee that we can recover from
* whatever messed up state the client put the connection into.
*/
wsSession.onClose(cr);
}
private static class WsReadListener implements ReadListener {
private final WsHttpUpgradeHandler wsProtocolHandler;
private final WsFrameServer wsFrame;
private WsReadListener(WsHttpUpgradeHandler wsProtocolHandler,
WsFrameServer wsFrame) {
this.wsProtocolHandler = wsProtocolHandler;
this.wsFrame = wsFrame;
}
@Override
public void onDataAvailable() {
try {
wsFrame.onDataAvailable();
} catch (WsIOException ws) {
wsProtocolHandler.close(ws.getCloseReason());
} catch (EOFException eof) {
CloseReason cr = new CloseReason(
CloseCodes.CLOSED_ABNORMALLY, eof.getMessage());
wsProtocolHandler.close(cr);
} catch (IOException ioe) {
onError(ioe);
CloseReason cr = new CloseReason(
CloseCodes.CLOSED_ABNORMALLY, ioe.getMessage());
wsProtocolHandler.close(cr);
}
}
@Override
public void onAllDataRead() {
// Will never happen with WebSocket
throw new IllegalStateException();
}
@Override
public void onError(Throwable throwable) {
wsProtocolHandler.onError(throwable);
}
}
private static class WsWriteListener implements WriteListener {
private final WsHttpUpgradeHandler wsProtocolHandler;
private final WsRemoteEndpointImplServer wsRemoteEndpointServer;
private WsWriteListener(WsHttpUpgradeHandler wsProtocolHandler,
WsRemoteEndpointImplServer wsRemoteEndpointServer) {
this.wsProtocolHandler = wsProtocolHandler;
this.wsRemoteEndpointServer = wsRemoteEndpointServer;
}
@Override
public void onWritePossible() {
// Triggered by the poller so this isn't the same thread that
// triggered the write so no need for a dispatch
wsRemoteEndpointServer.onWritePossible(false);
}
@Override
public void onError(Throwable throwable) {
wsProtocolHandler.onError(throwable);
wsRemoteEndpointServer.close();
}
}
}