BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
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.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2007 Ola Bini 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2007 Ola Bini <ola@ologix.com>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.ext.socket;

import java.io.IOException;
import java.net.BindException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.net.SocketException;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubyString;
import org.jruby.RubyThread;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.Block;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;

import org.jruby.util.io.FilenoUtil;
import org.jruby.util.io.SelectorFactory;
import java.nio.channels.spi.SelectorProvider;

Author:
Ola Bini/**
 * @author <a href="mailto:ola.bini@ki.se">Ola Bini</a>
 */
@JRubyClass(name="TCPServer", parent="TCPSocket")
public class RubyTCPServer extends RubyTCPSocket {
    static void createTCPServer(Ruby runtime) {
        RubyClass rb_cTCPServer = runtime.defineClass(
                "TCPServer", runtime.getClass("TCPSocket"), TCPSERVER_ALLOCATOR);

        rb_cTCPServer.defineAnnotatedMethods(RubyTCPServer.class);

        runtime.getObject().setConstant("TCPserver",rb_cTCPServer);
    }

    private static ObjectAllocator TCPSERVER_ALLOCATOR = new ObjectAllocator() {
        public IRubyObject allocate(Ruby runtime, RubyClass klass) {
            return new RubyTCPServer(runtime, klass);
        }
    };

    public RubyTCPServer(Ruby runtime, RubyClass type) {
        super(runtime, type);
    }

    @JRubyMethod(name = "initialize", required = 1, optional = 1, visibility = Visibility.PRIVATE)
    public IRubyObject initialize(ThreadContext context, IRubyObject[] args) {
        Ruby runtime = context.runtime;
        IRubyObject _host;
        IRubyObject _port = null;
        String host = "0.0.0.0";

        switch (args.length) {
            case 2:
                _host = args[0];
                _port = args[1];

                if (_host.isNil()) {
                    break;
                } else if (_host instanceof RubyFixnum) {
                    throw runtime.newTypeError(_host, runtime.getString());
                }

                RubyString hostString = _host.convertToString();
                if (hostString.size() > 0) host = hostString.toString();

                break;
            case 1:
                _host = context.nil;
                _port = args[0];
                break;
            default:
                throw runtime.newArgumentError(args.length, 1, 2);
        }

        int port = SocketUtils.getPortFrom(context, _port);

        try {
            InetAddress addr = InetAddress.getByName(host);

            ServerSocketChannel ssc = ServerSocketChannel.open();
            ssc.socket().setReuseAddress(true);

            InetSocketAddress socket_address = new InetSocketAddress(addr, port);

            ssc.socket().bind(socket_address);

            initSocket(newChannelFD(runtime, ssc));

        } catch(UnknownHostException e) {
            throw SocketUtils.sockerr(runtime, "initialize: name or service not known");

        } catch(BindException e) {
            throw runtime.newErrnoFromBindException(e, bindContextMessage(_host, port));

        } catch(SocketException e) {
            String msg = e.getMessage();

            if(msg.indexOf("Permission denied") != -1) {
                throw runtime.newErrnoEACCESError("bind(2)");
            } else {
                throw SocketUtils.sockerr(runtime, "initialize: name or service not known");
            }

        } catch(IOException e) {
            throw runtime.newIOErrorFromException(e);

        } catch (IllegalArgumentException iae) {
            throw SocketUtils.sockerr(runtime, iae.getMessage());
        }

        return this;
    }

    @JRubyMethod(name = "accept")
    public IRubyObject accept(ThreadContext context) {
        Ruby runtime = context.runtime;
        RubyTCPSocket socket = new RubyTCPSocket(runtime, runtime.getClass("TCPSocket"));

        try {
            RubyThread thread = context.getThread();

            while (true) {
                boolean ready = thread.select(this, SelectionKey.OP_ACCEPT);

                if (!ready) {
                    // we were woken up without being selected...poll for thread events and go back to sleep
                    context.pollThreadEvents();

                } else {
                    SocketChannel connected = getServerSocketChannel().accept();
                    if (connected == null) continue;

                    connected.finishConnect();

                    // Force the client socket to be blocking
                    synchronized (connected.blockingLock()) {
                        connected.configureBlocking(false);
                        connected.configureBlocking(true);
                    }

                    // otherwise one key has been selected (ours) so we get the channel and hand it off
                    socket.initSocket(newChannelFD(runtime, connected));

                    return socket;
                }
            }

        } catch(IOException e) {
            throw runtime.newIOErrorFromException(e);
        }
    }

    @JRubyMethod(name = "accept_nonblock")
    public IRubyObject accept_nonblock(ThreadContext context) {
        return accept_nonblock(context, context.runtime, true);
    }

    @JRubyMethod(name = "accept_nonblock")
    public IRubyObject accept_nonblock(ThreadContext context, IRubyObject opts) {
        return accept_nonblock(context, context.runtime, extractExceptionArg(context, opts));
    }

    public IRubyObject accept_nonblock(ThreadContext context, Ruby runtime, boolean ex) {
        RubyTCPSocket socket = new RubyTCPSocket(runtime, runtime.getClass("TCPSocket"));
        Selector selector = null;
        ServerSocketChannel ssc = getServerSocketChannel();

        synchronized (ssc.blockingLock()) {
            boolean oldBlocking = ssc.isBlocking();

            try {
                ssc.configureBlocking(false);
                selector = SelectorFactory.openWithRetryFrom(runtime, SelectorProvider.provider());

                boolean ready = context.getThread().select(this, SelectionKey.OP_ACCEPT, 0);

                if (!ready) {
                    // no connection immediately accepted, let them try again

                    if (ex) {
                        throw runtime.newErrnoEAGAINReadableError("Resource temporarily unavailable");
                    }

                    return runtime.newSymbol("wait_readable");

                } else {
                    // otherwise one key has been selected (ours) so we get the channel and hand it off
                    socket.initSocket(newChannelFD(runtime, ssc.accept()));

                    return socket;
                }

            } catch(IOException e) {
                throw runtime.newIOErrorFromException(e);

            } finally {
                try {
                    if (selector != null) selector.close();
                } catch (Exception e) {
                }
                try {ssc.configureBlocking(oldBlocking);} catch (IOException ioe) {}

            }
        }
    }

    @JRubyMethod(name = "sysaccept")
    public IRubyObject sysaccept(ThreadContext context) {
        Ruby runtime = context.runtime;

        try {
            RubyThread thread = context.getThread();

            while (true) {
                boolean ready = thread.select(this, SelectionKey.OP_ACCEPT);

                if (!ready) {
                    // we were woken up without being selected...poll for thread events and go back to sleep
                    context.pollThreadEvents();

                } else {
                    SocketChannel connected = getServerSocketChannel().accept();
                    if (connected == null) continue;

                    connected.finishConnect();

                    return runtime.newFixnum(FilenoUtil.filenoFrom(connected));
                }
            }

        } catch(IOException e) {
            throw runtime.newIOErrorFromException(e);
        }
    }

    @JRubyMethod(name = "listen", required = 1)
    public IRubyObject listen(ThreadContext context, IRubyObject backlog) {
        return RubyFixnum.zero(context.runtime);
    }

    @JRubyMethod(name = "peeraddr", rest = true)
    public IRubyObject peeraddr(ThreadContext context, IRubyObject[] args) {
        throw context.runtime.newNotImplementedError("not supported");
    }

    @JRubyMethod(name = "getpeername", rest = true)
    public IRubyObject getpeername(ThreadContext context, IRubyObject[] args) {
        throw context.runtime.newNotImplementedError("not supported");
    }

    @JRubyMethod(rest = true, meta = true)
    public static IRubyObject open(ThreadContext context, IRubyObject recv, IRubyObject[] args, Block block) {
        IRubyObject tcpServer = recv.callMethod(context, "new", args);

        if (!block.isGiven()) return tcpServer;

        try {
            return block.yield(context, tcpServer);
        } finally {
            tcpServer.callMethod(context, "close");
        }
    }

    public ServerSocketChannel getServerSocketChannel() {
        return (ServerSocketChannel)getChannel();
    }

    @Override
    public IRubyObject shutdown(ThreadContext context, IRubyObject[] args) {
        // act like a platform that does not support shutdown for server sockets
        throw context.runtime.newErrnoENOTCONNError();
    }

    @Override
    public IRubyObject gets(ThreadContext context) {
        throw context.runtime.newErrnoENOTCONNError();
    }

    @Override
    public IRubyObject gets(ThreadContext context, IRubyObject sep) {
        throw context.runtime.newErrnoENOTCONNError();
    }

    @Override
    public IRubyObject gets(ThreadContext context, IRubyObject sep, IRubyObject limit) {
        throw context.runtime.newErrnoENOTCONNError();
    }

    @Deprecated
    public IRubyObject accept() {
        return accept(getRuntime().getCurrentContext());
    }

    @Deprecated
    public IRubyObject listen(IRubyObject backlog) {
        return listen(getRuntime().getCurrentContext(), backlog);
    }

    @Deprecated
    public static IRubyObject open(IRubyObject recv, IRubyObject[] args, Block block) {
        return open(recv.getRuntime().getCurrentContext(), recv, args, block);
    }
}