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 jnr.constants.platform.Sock;
import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.common.IRubyWarnings;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.io.ChannelFD;
import org.jruby.util.io.Sockaddr;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.nio.channels.Channel;
import java.nio.channels.IllegalBlockingModeException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;

Author:
Ola Bini/**
 * @author <a href="mailto:ola.bini@ki.se">Ola Bini</a>
 */
@JRubyClass(name="Socket", parent="BasicSocket", include="Socket::Constants")
public class RubyServerSocket extends RubySocket {
    static void createServerSocket(Ruby runtime) {
        RubyClass rb_cSocket = runtime.defineClass("ServerSocket", runtime.getClass("Socket"), SERVER_SOCKET_ALLOCATOR);

        rb_cSocket.defineAnnotatedMethods(RubyServerSocket.class);
    }

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

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

    @JRubyMethod(name = "listen")
    public IRubyObject listen(ThreadContext context, IRubyObject backlog) {
        context.runtime.getWarnings().warnOnce(
                IRubyWarnings.ID.LISTEN_SERVER_SOCKET,
                "pass backlog to #bind instead of #listen (http://wiki.jruby.org/ServerSocket)");

        return context.runtime.newFixnum(0);
    }

    @JRubyMethod(notImplemented = true)
    public IRubyObject connect_nonblock(ThreadContext context, IRubyObject arg) {
        throw SocketUtils.sockerr(context.runtime, "server socket cannot connect");
    }

    @JRubyMethod(notImplemented = true)
    public IRubyObject connect(ThreadContext context, IRubyObject arg) {
        throw SocketUtils.sockerr(context.runtime, "server socket cannot connect");
    }

    @JRubyMethod()
    public IRubyObject bind(ThreadContext context, IRubyObject addr) {
        return bind(context, addr, RubyFixnum.zero(context.runtime));
    }

    @JRubyMethod()
    public IRubyObject bind(ThreadContext context, IRubyObject addr, IRubyObject backlog) {
        final InetSocketAddress iaddr;

        if (addr instanceof Addrinfo) {
            Addrinfo addrInfo = (Addrinfo) addr;
            if (!addrInfo.ip_p(context).isTrue()) {
                throw context.runtime.newTypeError("not an INET or INET6 address: " + addrInfo);
            }
            iaddr = new InetSocketAddress(addrInfo.getInetAddress().getHostAddress(), addrInfo.getPort());
        } else {
            iaddr = Sockaddr.addressFromSockaddr_in(context, addr);
        }
        doBind(context, getChannel(), iaddr, RubyFixnum.fix2int(backlog));

        return RubyFixnum.zero(context.runtime);
    }

    @JRubyMethod()
    public IRubyObject accept(ThreadContext context) {
        return doAccept(this, context, true);
    }

    @JRubyMethod()
    public IRubyObject accept_nonblock(ThreadContext context) {
        return accept_nonblock(context, context.nil);
    }

    @JRubyMethod()
    public IRubyObject accept_nonblock(ThreadContext context, IRubyObject opts) {
        return doAcceptNonblock(this, context, extractExceptionArg(context, opts));
    }

    @Override
    protected ChannelFD initChannelFD(Ruby runtime) {
        Channel channel;

        try {
            if (soType == Sock.SOCK_STREAM) {
                channel = ServerSocketChannel.open();
            }
            else {
                throw runtime.newArgumentError("unsupported server socket type `" + soType + "'");
            }

            return newChannelFD(runtime, channel);
        }
        catch (IOException e) {
            throw sockerr(runtime, "initialize: " + e.toString(), e);
        }
    }

    public static IRubyObject doAcceptNonblock(RubySocket sock, ThreadContext context, boolean ex) {
        try {
            Channel channel = sock.getChannel();
            if (channel instanceof SelectableChannel) {
                SelectableChannel selectable = (SelectableChannel)channel;

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

                    try {
                        selectable.configureBlocking(false);

                        IRubyObject socket = doAccept(sock, context, ex);
                        if (!(socket instanceof RubySocket)) return socket;
                        SocketChannel socketChannel = (SocketChannel)((RubySocket)socket).getChannel();
                        InetSocketAddress addr = (InetSocketAddress)socketChannel.socket().getRemoteSocketAddress();

                        return context.runtime.newArray(
                                socket,
                                Sockaddr.packSockaddrFromAddress(context, addr));
                    } finally {
                        selectable.configureBlocking(oldBlocking);
                    }
                }
            }
            else {
                throw context.runtime.newErrnoENOPROTOOPTError();
            }
        }
        catch (IOException e) {
            throw sockerr(context.runtime, e.getLocalizedMessage(), e);
        }
    }

    public static IRubyObject doAccept(RubySocket sock, ThreadContext context, boolean ex) {
        Ruby runtime = context.runtime;

        Channel channel = sock.getChannel();

        try {
            if (channel instanceof ServerSocketChannel) {
                ServerSocketChannel serverChannel = (ServerSocketChannel)sock.getChannel();

                SocketChannel socket = serverChannel.accept();

                if (socket == null) {
                    // This appears to be undocumented in JDK; null as a sentinel value
                    // for a nonblocking accept with nothing available. We raise for Ruby.
                    // indicates that no connection is available in non-blocking mode
                    if (!ex) return runtime.newSymbol("wait_readable");
                    throw runtime.newErrnoEAGAINReadableError("accept(2) would block");
                }

                RubySocket rubySocket = new RubySocket(runtime, runtime.getClass("Socket"));
                rubySocket.initFromServer(runtime, sock, socket);

                return runtime.newArray(rubySocket, new Addrinfo(runtime, runtime.getClass("Addrinfo"), socket.getRemoteAddress()));
            }
            throw runtime.newErrnoENOPROTOOPTError();
        }
        catch (IllegalBlockingModeException e) {
            // indicates that no connection is available in non-blocking mode
            if (!ex) return runtime.newSymbol("wait_readable");
            throw runtime.newErrnoEAGAINReadableError("accept(2) would block");
        }
        catch (IOException e) {
            throw sockerr(runtime, e.getLocalizedMessage(), e);
        }
    }

    private void doBind(ThreadContext context, Channel channel, InetSocketAddress iaddr, int backlog) {
        Ruby runtime = context.runtime;

        try {
            if (channel instanceof ServerSocketChannel) {
                ServerSocket socket = ((ServerSocketChannel)channel).socket();
                socket.bind(iaddr, backlog);
            }
            else {
                throw runtime.newErrnoENOPROTOOPTError();
            }
        }
        catch (UnknownHostException e) {
            throw SocketUtils.sockerr(runtime, "bind(2): unknown host");
        }
        catch (SocketException e) {
            throw buildSocketException(runtime, e, "bind(2)", iaddr);
        }
        catch (IOException e) {
            throw sockerr(runtime, "bind(2): name or service not known", e);
        }
        catch (IllegalArgumentException e) {
            throw sockerr(runtime, e.getMessage(), e);
        }
    }
}// RubySocket