/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.server.mgmt.domain;
import org.jboss.as.protocol.ProtocolChannelClient;
import org.jboss.as.protocol.ProtocolMessages;
import org.jboss.as.protocol.StreamUtils;
import org.jboss.as.protocol.mgmt.AbstractManagementRequest;
import org.jboss.as.protocol.mgmt.ActiveOperation;
import org.jboss.as.protocol.mgmt.FlushableDataOutput;
import org.jboss.as.protocol.mgmt.ManagementChannelHandler;
import org.jboss.as.protocol.mgmt.ManagementClientChannelStrategy;
import org.jboss.as.protocol.mgmt.ManagementRequestContext;
import org.jboss.as.remoting.management.ManagementRemotingServices;
import org.jboss.as.server.ServerMessages;
import org.jboss.remoting3.Channel;
import org.jboss.remoting3.CloseHandler;
import org.jboss.remoting3.Connection;
import org.xnio.OptionMap;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import javax.security.auth.callback.CallbackHandler;
import java.io.DataInput;
import java.io.IOException;
import java.net.URI;
import java.security.GeneralSecurityException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.concurrent.ExecutorService;
/**
* The connection to the host-controller. In case the channel is closed it's the host-controllers responsibility
* to ask individual managed servers to reconnect.
*
* @author Emanuel Muckenhuber
*/
public class HostControllerServerConnection extends ManagementClientChannelStrategy {
private static final String SERVER_CHANNEL_TYPE = ManagementRemotingServices.SERVER_CHANNEL;
private final String serverProcessName;
private final ProtocolChannelClient.Configuration configuration;
private final ManagementChannelHandler channelHandler;
private volatile Connection connection;
private volatile Channel channel;
public HostControllerServerConnection(final String serverProcessName, final ProtocolChannelClient.Configuration configuration,
final ExecutorService executorService) {
this.serverProcessName = serverProcessName;
this.configuration = configuration;
this.channelHandler = new ManagementChannelHandler(this, executorService);
}
/**
* Connect to the remote host-controller.
*
* @param callback the completed callback
* @throws IOException
*/
public synchronized void connect(final CallbackHandler callbackHandler, final ActiveOperation.CompletedCallback<Void> callback) throws IOException {
boolean ok = false;
try {
openChannel(callbackHandler);
channelHandler.executeRequest(new ServerRegisterRequest(), null, callback);
ok = true;
} finally {
if(!ok) {
close();
}
}
}
/**
* Reconnect to the server.
*
* @param connectionURI the connection uri
* @param callbackHandler the callback handler
* @param callback the completed callback
* @throws IOException
*/
public synchronized void reconnect(final URI connectionURI, final CallbackHandler callbackHandler, final ActiveOperation.CompletedCallback<Boolean> callback) throws IOException {
boolean ok = false;
try {
configuration.setUri(connectionURI);
openChannel(callbackHandler);
channelHandler.executeRequest(new ServerReconnectRequest(), null, callback);
ok = true;
} finally {
if(!ok) {
close();
}
}
}
/** {@inheritDoc} */
@Override
public Channel getChannel() throws IOException {
final Channel channel = this.channel;
if(channel == null) {
synchronized (this) {
if(this.channel == null) {
throw ProtocolMessages.MESSAGES.channelClosed();
}
}
}
return channel;
}
/** {@inheritDoc} */
@Override
public void close() throws IOException {
StreamUtils.safeClose(channel);
StreamUtils.safeClose(connection);
}
/**
* Get the management channel handler.
*
* @return the handler
*/
public ManagementChannelHandler getChannelHandler() {
return channelHandler;
}
/**
* Establish the connection.
*
* @throws IOException
*/
private synchronized void openChannel(final CallbackHandler callbackHandler) throws IOException {
boolean ok = false;
try {
// Connect
final ProtocolChannelClient client = ProtocolChannelClient.create(configuration);
connection = client.connectSync(callbackHandler, null, getAcceptingSSLContext());
connection.addCloseHandler(new CloseHandler<Connection>() {
@Override
public void handleClose(final Connection closed, final IOException exception) {
synchronized (this) {
if(connection == closed) {
connection = null;
}
}
}
});
channel = connection.openChannel(SERVER_CHANNEL_TYPE, OptionMap.EMPTY).get();
channel.addCloseHandler(new CloseHandler<Channel>() {
@Override
public void handleClose(final Channel closed, final IOException exception) {
// Cancel active operations
channelHandler.handleChannelClosed(closed, exception);
synchronized (this) {
if(channel == closed) {
channel = null;
}
}
}
});
channel.receiveMessage(channelHandler.getReceiver());
ok = true;
} finally {
if(!ok) {
StreamUtils.safeClose(channel);
StreamUtils.safeClose(connection);
}
}
}
private static SSLContext getAcceptingSSLContext() throws IOException {
/*
* This connection is only a connection back to the local host controller.
*
* The HostController that started this process will have already provided the
* required information regarding the connection so quietly allow the SSL connection
* to be established.
*/
try {
SSLContext sslContext = SSLContext.getInstance("TLS");
TrustManager[] trustManagers = new TrustManager[] { new X509TrustManager() {
public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
}
public X509Certificate[] getAcceptedIssuers() {
return null;
}
} };
sslContext.init(null, trustManagers, null);
return sslContext;
} catch (GeneralSecurityException e) {
throw ServerMessages.MESSAGES.unableToInitialiseSSLContext(e.getMessage());
}
}
/**
* The server registration request.
*/
private class ServerRegisterRequest extends AbstractManagementRequest<Void, Void> {
@Override
public byte getOperationType() {
return DomainServerProtocol.REGISTER_REQUEST;
}
@Override
protected void sendRequest(ActiveOperation.ResultHandler<Void> resultHandler, ManagementRequestContext<Void> voidManagementRequestContext, FlushableDataOutput output) throws IOException {
output.write(DomainServerProtocol.PARAM_SERVER_NAME);
output.writeUTF(serverProcessName);
}
@Override
public void handleRequest(DataInput input, ActiveOperation.ResultHandler<Void> resultHandler, ManagementRequestContext<Void> voidManagementRequestContext) throws IOException {
resultHandler.done(null);
}
}
/**
* The server reconnect request. Additionally to registering the server at the HC, the response will
* contain whether this server is still in sync or needs to be restarted.
*/
public class ServerReconnectRequest extends AbstractManagementRequest<Boolean, Void> {
@Override
public byte getOperationType() {
return DomainServerProtocol.SERVER_RECONNECT_REQUEST;
}
@Override
protected void sendRequest(final ActiveOperation.ResultHandler<Boolean> resultHandler, final ManagementRequestContext<Void> context, final FlushableDataOutput output) throws IOException {
output.write(DomainServerProtocol.PARAM_SERVER_NAME);
output.writeUTF(serverProcessName);
}
@Override
public void handleRequest(final DataInput input, final ActiveOperation.ResultHandler<Boolean> resultHandler, final ManagementRequestContext<Void> context) throws IOException {
final byte param = input.readByte();
context.executeAsync(new ManagementRequestContext.AsyncTask<Void>() {
@Override
public void execute(ManagementRequestContext<Void> voidManagementRequestContext) throws Exception {
if(param == DomainServerProtocol.PARAM_OK) {
// Still in sync with the HC
resultHandler.done(Boolean.TRUE);
} else {
// Out of sync, set restart-required
resultHandler.done(Boolean.FALSE);
}
}
});
}
}
}