/*
* 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.felix.shell.remote;
import java.io.BufferedReader;
import java.io.IOException;
import java.net.Socket;
import org.apache.felix.shell.ShellService;
import org.apache.felix.service.command.CommandProcessor;
import org.apache.felix.service.command.CommandSession;
/**
* Implements the shell.
* <p>
* This class is instantiated by the {@link Listener} thread to handle a single
* remote connection in its own thread. The connection handler thread either
* terminates on request by the remote end or by the Remote Shell bundle being
* stopped. In the latter case, the {@link #terminate()} method is called, which
* closes the Socket used to handle the remote console. This causes a
* <code>SocketException</code> in the handler thread reading from the socket
* which in turn causes the {@link #run()} method to terminate and thus to
* end the handler thread.
*/
class Shell implements Runnable
{
private final Listener m_owner;
private final Socket m_socket;
private final AtomicInteger m_useCounter;
private volatile TerminalPrintStream m_out;
public Shell(Listener owner, Socket s, AtomicInteger counter)
{
m_owner = owner;
m_socket = s;
m_useCounter = counter;
}//constructor
void terminate()
{
// called by Listener.deactivate() to terminate this session
exit("\r\nFelix Remote Shell Console Terminating");
}//terminate
/**
* Runs the shell.
*/
public void run()
{
m_owner.registerConnection(this);
String msg = null;
try
{
m_out = new TerminalPrintStream(
m_owner.getServices(), m_socket.getOutputStream());
Object obj = null;
if ((obj = m_owner.getServices().getCommandProcessor(ServiceMediator.NO_WAIT))
!= null)
{
CommandProcessor cp = (CommandProcessor) obj;
CommandSession session =
cp.createSession(m_socket.getInputStream(), m_out, m_out);
startGogoShell(session);
}
else if ((obj = m_owner.getServices().getShellService(ServiceMediator.NO_WAIT))
!= null)
{
startFelixShell();
}
else
{
msg = "No shell services available...exiting.";
}
}
catch (IOException ex)
{
m_owner.getServices().error("Shell::run()", ex);
}
finally
{
// no need to clean up in/out, since exit does it all
exit(msg);
}
}//run
private void startGogoShell(CommandSession session)
{
try
{
session.execute("gosh --login --noshutdown");
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
session.close();
}
}
private void startFelixShell() throws IOException
{
BufferedReader in = new BufferedReader(
new TerminalReader(m_socket.getInputStream(), m_out));
ReentrantLock lock = new ReentrantLock();
// Print welcome banner.
m_out.println();
m_out.println("Felix Remote Shell Console:");
m_out.println("============================");
m_out.println("");
do
{
String line = "";
try
{
m_out.print("-> ");
line = in.readLine();
//make sure to capture end of stream
if (line == null)
{
m_out.println("exit");
return;
}
}
catch (Exception ex)
{
return;
}
line = line.trim();
if (line.equalsIgnoreCase("exit") || line.equalsIgnoreCase("disconnect"))
{
return;
}
ShellService shs = (ShellService)
m_owner.getServices().getShellService(ServiceMediator.NO_WAIT);
try
{
lock.acquire();
shs.executeCommand(line, m_out, m_out);
}
catch (Exception ex)
{
m_owner.getServices().error("Shell::run()", ex);
}
finally
{
lock.release();
}
}
while (true);
}
private void exit(String message)
{
// farewell message
if (message != null)
{
m_out.println(message);
}
m_out.println("Good Bye!");
m_out.close();
try
{
m_socket.close();
}
catch (IOException ex)
{
m_owner.getServices().error("Shell::exit()", ex);
}
m_owner.unregisterConnection(this);
m_useCounter.decrement();
}//exit
}//class Shell