/*
 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
 * @bug 4927640
 * @summary Tests the SCTP protocol implementation
 * @author chegar
 */

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.nio.ByteBuffer;
import java.nio.channels.NotYetConnectedException;
import java.nio.channels.ClosedChannelException;
import com.sun.nio.sctp.AbstractNotificationHandler;
import com.sun.nio.sctp.AssociationChangeNotification;
import com.sun.nio.sctp.AssociationChangeNotification.AssocChangeEvent;
import com.sun.nio.sctp.HandlerResult;
import com.sun.nio.sctp.IllegalReceiveException;
import com.sun.nio.sctp.MessageInfo;
import com.sun.nio.sctp.Notification;
import com.sun.nio.sctp.SctpChannel;
import com.sun.nio.sctp.SctpServerChannel;
import com.sun.nio.sctp.ShutdownNotification;
import static java.lang.System.out;
import static java.lang.System.err;

public class Receive {
    /* Latches used to synchronize between the client and server so that
     * connections without any IO may not be closed without being accepted */
    final CountDownLatch clientFinishedLatch = new CountDownLatch(1);
    final CountDownLatch serverFinishedLatch = new CountDownLatch(1);

    /* Used to verify that the ppid is being sent and received correctly */
    static final int PPID = 5;

    void test(String[] args) {
        SocketAddress address = null;
        Server server;


        if (!Util.isSCTPSupported()) {
            out.println("SCTP protocol is not supported");
            out.println("Test cannot be run");
            return;
        }

        if (args.length == 2) {
            /* requested to connecct to a specific address */
            try {
                int port = Integer.valueOf(args[1]);
                address = new InetSocketAddress(args[0], port);
            } catch (NumberFormatException nfe) {
                err.println(nfe);
            }
        } else {
            /* start server on local machine, default */
            try {
                server = new Server();
                server.start();
                address = server.address();
                debug("Server started and listening on " + address);
            } catch (IOException ioe) {
                ioe.printStackTrace();
                return;
            }
        }

        doTest(address);
    }

    void doTest(SocketAddress peerAddress) {
        SctpChannel channel = null;
        ByteBuffer buffer = ByteBuffer.allocate(Util.LARGE_BUFFER);
        MessageInfo info;

        try {
            channel = SctpChannel.open();
            ReceiveNotificationHandler handler =
                new ReceiveNotificationHandler(channel);

            /* TEST 1: Verify NotYetConnectedException thrown */
            try {
                channel.receive(buffer, null, handler);
                fail("should have thrown NotYetConnectedException");
            } catch (NotYetConnectedException unused) {
                pass();
            }  catch (IOException ioe) {
                unexpected(ioe);
            }

            channel.connect(peerAddress);

            /* TEST 2: receive small message */
            do {
                debug("Test 2: invoking receive");
                info = channel.receive(buffer, null, handler);
                if (info == null) {
                    fail("unexpected null from receive");
                    return;
                }
            } while (!info.isComplete());

            buffer.flip();
            check(handler.receivedCommUp(), "SCTP_COMM_UP not received");
            check(info != null, "info is null");
            check(info.address() != null, "address is null");
            check(info.association() != null, "association is null");
            check(info.isComplete(), "message is not complete");
            check(info.isUnordered() != true,
                  "message should not be unordered");
            check(info.streamNumber() >= 0, "invalid stream number");
            check(info.payloadProtocolID() == PPID, "PPID incorrect");
            check(info.bytes() == Util.SMALL_MESSAGE.getBytes("ISO-8859-1").
                  length, "bytes received not equal to message length");
            check(info.bytes() == buffer.remaining(), "bytes != remaining");
            check(Util.compare(buffer, Util.SMALL_MESSAGE),
                  "received message not the same as sent message");

            buffer.clear();

             /* TEST 3: receive large message */
            do {
                debug("Test 3: invoking receive");
                info = channel.receive(buffer, null, handler);
                if (info == null) {
                    fail("unexpected null from receive");
                    return;
                }
            } while (!info.isComplete());

            buffer.flip();
            check(info != null, "info is null");
            check(info.address() != null, "address is null");
            check(info.association() != null, "association is null");
            check(info.isComplete(), "message is not complete");
            check(info.isUnordered() != true,
                  "message should not be unordered");
            check(info.streamNumber() >= 0, "invalid stream number");
            check(info.bytes() == Util.LARGE_MESSAGE.getBytes("ISO-8859-1").
                  length, "bytes received not equal to message length");
            check(info.bytes() == buffer.remaining(), "bytes != remaining");
            check(Util.compare(buffer, Util.LARGE_MESSAGE),
                  "received message not the same as sent message");

            buffer.clear();

            /* TEST 4: EOF */
            buffer.clear();  // buffer position 0
            info = channel.receive(buffer,null, handler);
            check(info != null, "info is null");
            check(info.bytes() == -1, "should have received EOF");
            check(buffer.position() == 0, "buffer position should be unchanged");

            /* TEST 5: ClosedChannelException */
            channel.close();
            try {
                channel.receive(buffer, null, null);
                fail("should have thrown ClosedChannelException");
            } catch (ClosedChannelException cce) {
               pass();
            } catch (IOException ioe) {
                unexpected(ioe);
            }
            handler = null;

            /* TEST 6: handler returns RETURN after handling a notification */
            ReceiveNotificationHandler handler2 =
                new ReceiveNotificationHandler(null); /* HandlerResult.RETURN */
            channel = SctpChannel.open(peerAddress, 0, 0);
            info = channel.receive(buffer, null, handler2);
            check(info == null, "channel should return null");
            check(handler2.receivedCommUp(), "SCTP_COMM_UP not received");
            check(buffer.position() == 0, "buffer position should be unchanged");

            /* TEST 7: Non blocking channel return null if no data */
            channel.configureBlocking(false);
            info = channel.receive(buffer, null, null);
            check(info == null, "non-blocking channel should return null");
            check(buffer.position() == 0, "buffer position should be unchanged");
        } catch (IOException ioe) {
            unexpected(ioe);
        } finally {
            clientFinishedLatch.countDown();
            try { serverFinishedLatch.await(10L, TimeUnit.SECONDS); }
            catch (InterruptedException ie) { unexpected(ie); }
            if (channel != null) {
                try { channel.close(); }
                catch (IOException e) { unexpected (e);}
            }
        }
    }

    class Server implements Runnable
    {
        final InetSocketAddress serverAddr;
        private SctpServerChannel ssc;

        public Server() throws IOException {
            ssc = SctpServerChannel.open().bind(null);
            java.util.Set<SocketAddress> addrs = ssc.getAllLocalAddresses();
            if (addrs.isEmpty())
                debug("addrs should not be empty");

            serverAddr = (InetSocketAddress) addrs.iterator().next();
        }

        public void start() {
            (new Thread(this, "Server-"  + serverAddr.getPort())).start();
        }

        public InetSocketAddress address() {
            return serverAddr;
        }

        @Override
        public void run() {
            try {
                SctpChannel sc = ssc.accept();

                /* send a small message */
                MessageInfo info = MessageInfo.createOutgoing(null, 0)
                        .payloadProtocolID(PPID);
                ByteBuffer buf = ByteBuffer.allocateDirect(Util.SMALL_BUFFER);
                buf.put(Util.SMALL_MESSAGE.getBytes("ISO-8859-1"));
                buf.flip();

                debug("sending small message: " + buf);
                sc.send(buf, info);

                /* send a large message */
                buf = ByteBuffer.allocateDirect(Util.LARGE_BUFFER);
                buf.put(Util.LARGE_MESSAGE.getBytes("ISO-8859-1"));
                buf.flip();

                debug("sending large message: " + buf);
                sc.send(buf, info);
                sc.shutdown();
                debug("shutdown");
                ReceiveNotificationHandler handler =
                    new ReceiveNotificationHandler(sc);
                sc.receive(buf, null, handler);
                sc.close();

                /* accept another socket for the TEST 6 */
                sc = ssc.accept();
                ssc.close();

                clientFinishedLatch.await(10L, TimeUnit.SECONDS);
                serverFinishedLatch.countDown();
                sc.close();
            } catch (IOException ioe) {
                unexpected(ioe);
            } catch (InterruptedException ie) {
                unexpected(ie);
            }
        }
    }

    class ReceiveNotificationHandler extends AbstractNotificationHandler<Object>
    {
        SctpChannel channel;
        boolean receivedCommUp;  // false

        public ReceiveNotificationHandler(SctpChannel channel) {
            this.channel = channel;
        }

        public boolean receivedCommUp() {
            return receivedCommUp;
        }

        @Override
        public HandlerResult handleNotification(
                Notification notification, Object attachment) {
            fail("Unknown notification type");
            return HandlerResult.CONTINUE;
        }

        @Override
        public HandlerResult handleNotification(
                AssociationChangeNotification notification, Object attachment) {
            AssocChangeEvent event = notification.event();
            debug("AssociationChangeNotification");
            debug("  Association: " + notification.association());
            debug("  Event: " + event);

            if (event.equals(AssocChangeEvent.COMM_UP))
                receivedCommUp = true;

            if (channel == null)
                return HandlerResult.RETURN;

            /* TEST 4: IllegalReceiveException - If the given handler invokes
             * the receive method of this channel*/
            ByteBuffer buffer = ByteBuffer.allocate(10);
            try {
                channel.receive(buffer, null, this);
                fail("IllegalReceiveException expected");
            } catch (IllegalReceiveException unused) {
                pass();
            } catch (IOException ioe) {
                unexpected(ioe);
            }

            return HandlerResult.CONTINUE;
        }

        @Override
        public HandlerResult handleNotification(
                ShutdownNotification notification, Object attachment) {
            debug("ShutdownNotification");
            debug("  Association: " + notification.association());
            return HandlerResult.CONTINUE;
        }
    }
        //--------------------- Infrastructure ---------------------------
    boolean debug = true;
    volatile int passed = 0, failed = 0;
    void pass() {passed++;}
    void fail() {failed++; Thread.dumpStack();}
    void fail(String msg) {System.err.println(msg); fail();}
    void unexpected(Throwable t) {failed++; t.printStackTrace();}
    void check(boolean cond) {if (cond) pass(); else fail();}
    void check(boolean cond, String failMessage) {if (cond) pass(); else fail(failMessage);}
    void debug(String message) {if(debug) {
          System.out.println(Thread.currentThread() + " " + message); } }
    public static void main(String[] args) throws Throwable {
        Class<?> k = new Object(){}.getClass().getEnclosingClass();
        try {k.getMethod("instanceMain",String[].class)
                .invoke( k.newInstance(), (Object) args);}
        catch (Throwable e) {throw e.getCause();}}
    public void instanceMain(String[] args) throws Throwable {
        try {test(args);} catch (Throwable t) {unexpected(t);}
        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new AssertionError("Some tests failed");}

}