/*

 * Copyright (c) 2003, 2008, 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

 * @summary Tests behavior when client or server gets object of unknown class

 * @author Eamonn McManus

 * @run clean MissingClassTest SingleClassLoader

 * @run build MissingClassTest SingleClassLoader

 * @run main MissingClassTest

 */

/*

  Tests that clients and servers react correctly when they receive

  objects of unknown classes.  This can happen easily due to version

  skew or missing jar files on one end or the other.  The default

  behaviour of causing a connection to die because of the resultant

  IOException is not acceptable!  We try sending attributes and invoke

  parameters to the server of classes it doesn't know, and we try

  sending attributes, exceptions and notifications to the client of

  classes it doesn't know.

  We also test objects that are of known class but not serializable.

  The test cases are similar.

 */

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.NotSerializableException;

import java.io.ObjectOutputStream;

import java.net.MalformedURLException;

import java.util.HashMap;

import java.util.Map;

import java.util.Random;

import java.util.Set;

import javax.management.Attribute;

import javax.management.MBeanServer;

import javax.management.MBeanServerConnection;

import javax.management.MBeanServerFactory;

import javax.management.Notification;

import javax.management.NotificationBroadcasterSupport;

import javax.management.NotificationFilter;

import javax.management.NotificationListener;

import javax.management.ObjectName;

import javax.management.remote.JMXConnectionNotification;

import javax.management.remote.JMXConnector;

import javax.management.remote.JMXConnectorFactory;

import javax.management.remote.JMXConnectorServer;

import javax.management.remote.JMXConnectorServerFactory;

import javax.management.remote.JMXServiceURL;

import javax.management.remote.rmi.RMIConnectorServer;

public class MissingClassTest {

    private static final int NNOTIFS = 50;

    private static ClassLoader clientLoader, serverLoader;

    private static Object serverUnknown;

    private static Exception clientUnknown;

    private static ObjectName on;

    private static final Object[] NO_OBJECTS = new Object[0];

    private static final String[] NO_STRINGS = new String[0];

    private static final Object unserializableObject = Thread.currentThread();

    private static boolean isInstance(Object o, String cn) {

        try {

            Class<?> c = Class.forName(cn);

            return c.isInstance(o);

        } catch (ClassNotFoundException x) {

            return false;

        }

    }

    public static void main(String[] args) throws Exception {

        System.out.println("Test that the client or server end of a " +

                           "connection does not fail if sent an object " +

                           "it cannot deserialize");

        on = new ObjectName("test:type=Test");

        ClassLoader testLoader = MissingClassTest.class.getClassLoader();

        clientLoader =

            new SingleClassLoader("$ServerUnknown$", HashMap.class,

                                  testLoader);

        serverLoader =

            new SingleClassLoader("$ClientUnknown$", Exception.class,

                                  testLoader);

        serverUnknown =

            clientLoader.loadClass("$ServerUnknown$").newInstance();

        clientUnknown = (Exception)

            serverLoader.loadClass("$ClientUnknown$").newInstance();

        final String[] protos = {"rmi", /*"iiop",*/ "jmxmp"};

        boolean ok = true;

        for (int i = 0; i < protos.length; i++) {

            try {

                ok &= test(protos[i]);

            } catch (Exception e) {

                System.out.println("TEST FAILED WITH EXCEPTION:");

                e.printStackTrace(System.out);

                ok = false;

            }

        }

        if (ok)

            System.out.println("Test passed");

        else {

            throw new RuntimeException("TEST FAILED");

        }

    }

    private static boolean test(String proto) throws Exception {

        System.out.println("Testing for proto " + proto);

        boolean ok = true;

        MBeanServer mbs = MBeanServerFactory.newMBeanServer();

        mbs.createMBean(Test.class.getName(), on);

        JMXConnectorServer cs;

        JMXServiceURL url = new JMXServiceURL(proto, null, 0);

        Map<String,Object> serverMap = new HashMap<>();

        serverMap.put(JMXConnectorServerFactory.DEFAULT_CLASS_LOADER,

                      serverLoader);

        // make sure no auto-close at server side

        serverMap.put("jmx.remote.x.server.connection.timeout", "888888888");

        try {

            cs = JMXConnectorServerFactory.newJMXConnectorServer(url,

                                                                 serverMap,

                                                                 mbs);

        } catch (MalformedURLException e) {

            System.out.println("System does not recognize URL: " + url +

                               "; ignoring");

            return true;

        }

        cs.start();

        JMXServiceURL addr = cs.getAddress();

        Map<String,Object> clientMap = new HashMap<>();

        clientMap.put(JMXConnectorFactory.DEFAULT_CLASS_LOADER,

                      clientLoader);

        System.out.println("Connecting for client-unknown test");

        JMXConnector client = JMXConnectorFactory.connect(addr, clientMap);

        // add a listener to verify no failed notif

        CNListener cnListener = new CNListener();

        client.addConnectionNotificationListener(cnListener, null, null);

        MBeanServerConnection mbsc = client.getMBeanServerConnection();

        System.out.println("Getting attribute with class unknown to client");

        try {

            Object result = mbsc.getAttribute(on, "ClientUnknown");

            System.out.println("TEST FAILS: getAttribute for class " +

                               "unknown to client should fail, returned: " +

                               result);

            ok = false;

        } catch (IOException e) {

            Throwable cause = e.getCause();

            if (isInstance(cause, "org.omg.CORBA.MARSHAL"))  // see CR 4935098

                cause = cause.getCause();

            if (cause instanceof ClassNotFoundException) {

                System.out.println("Success: got an IOException wrapping " +

                                   "a ClassNotFoundException");

            } else {

                System.out.println("TEST FAILS: Caught IOException (" + e +

                                   ") but cause should be " +

                                   "ClassNotFoundException: " + cause);

                ok = false;

            }

        }

        System.out.println("Doing queryNames to ensure connection alive");

        Set<ObjectName> names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        System.out.println("Provoke exception of unknown class");

        try {

            mbsc.invoke(on, "throwClientUnknown", NO_OBJECTS, NO_STRINGS);

            System.out.println("TEST FAILS: did not get exception");

            ok = false;

        } catch (IOException e) {

            Throwable wrapped = e.getCause();

            if (isInstance(wrapped, "org.omg.CORBA.MARSHAL"))  // see CR 4935098

                wrapped = wrapped.getCause();

            if (wrapped instanceof ClassNotFoundException) {

                System.out.println("Success: got an IOException wrapping " +

                                   "a ClassNotFoundException: " +

                                   wrapped);

            } else {

                System.out.println("TEST FAILS: Got IOException but cause " +

                                   "should be ClassNotFoundException: ");

                if (wrapped == null)

                    System.out.println("(null)");

                else

                    wrapped.printStackTrace(System.out);

                ok = false;

            }

        } catch (Exception e) {

            System.out.println("TEST FAILS: Got wrong exception: " +

                               "should be IOException with cause " +

                               "ClassNotFoundException:");

            e.printStackTrace(System.out);

            ok = false;

        }

        System.out.println("Doing queryNames to ensure connection alive");

        names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        ok &= notifyTest(client, mbsc);

        System.out.println("Doing queryNames to ensure connection alive");

        names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        for (int i = 0; i < 2; i++) {

            boolean setAttribute = (i == 0); // else invoke

            String what = setAttribute ? "setAttribute" : "invoke";

            System.out.println("Trying " + what +

                               " with class unknown to server");

            try {

                if (setAttribute) {

                    mbsc.setAttribute(on, new Attribute("ServerUnknown",

                                                        serverUnknown));

                } else {

                    mbsc.invoke(on, "useServerUnknown",

                                new Object[] {serverUnknown},

                                new String[] {"java.lang.Object"});

                }

                System.out.println("TEST FAILS: " + what + " with " +

                                   "class unknown to server should fail " +

                                   "but did not");

                ok = false;

            } catch (IOException e) {

                Throwable cause = e.getCause();

                if (isInstance(cause, "org.omg.CORBA.MARSHAL"))  // see CR 4935098

                    cause = cause.getCause();

                if (cause instanceof ClassNotFoundException) {

                    System.out.println("Success: got an IOException " +

                                       "wrapping a ClassNotFoundException");

                } else {

                    System.out.println("TEST FAILS: Caught IOException (" + e +

                                       ") but cause should be " +

                                       "ClassNotFoundException: " + cause);

                    e.printStackTrace(System.out); // XXX

                    ok = false;

                }

            }

        }

        System.out.println("Doing queryNames to ensure connection alive");

        names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        System.out.println("Trying to get unserializable attribute");

        try {

            mbsc.getAttribute(on, "Unserializable");

            System.out.println("TEST FAILS: get unserializable worked " +

                               "but should not");

            ok = false;

        } catch (IOException e) {

            System.out.println("Success: got an IOException: " + e +

                               " (cause: " + e.getCause() + ")");

        }

        System.out.println("Doing queryNames to ensure connection alive");

        names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        System.out.println("Trying to set unserializable attribute");

        try {

            Attribute attr =

                new Attribute("Unserializable", unserializableObject);

            mbsc.setAttribute(on, attr);

            System.out.println("TEST FAILS: set unserializable worked " +

                               "but should not");

            ok = false;

        } catch (IOException e) {

            System.out.println("Success: got an IOException: " + e +

                               " (cause: " + e.getCause() + ")");

        }

        System.out.println("Doing queryNames to ensure connection alive");

        names = mbsc.queryNames(null, null);

        System.out.println("queryNames returned " + names);

        System.out.println("Trying to throw unserializable exception");

        try {

            mbsc.invoke(on, "throwUnserializable", NO_OBJECTS, NO_STRINGS);

            System.out.println("TEST FAILS: throw unserializable worked " +

                               "but should not");

            ok = false;

        } catch (IOException e) {

            System.out.println("Success: got an IOException: " + e +

                               " (cause: " + e.getCause() + ")");

        }

        client.removeConnectionNotificationListener(cnListener);

        ok = ok && !cnListener.failed;

        client.close();

        cs.stop();

        if (ok)

            System.out.println("Test passed for protocol " + proto);

        System.out.println();

        return ok;

    }

    private static class TestListener implements NotificationListener {

        TestListener(LostListener ll) {

            this.lostListener = ll;

        }

        public void handleNotification(Notification n, Object h) {

            /* Connectors can handle unserializable notifications in

               one of two ways.  Either they can arrange for the

               client to get a NotSerializableException from its

               fetchNotifications call (RMI connector), or they can

               replace the unserializable notification by a

               JMXConnectionNotification.NOTIFS_LOST (JMXMP

               connector).  The former case is handled by code within

               the connector client which will end up sending a

               NOTIFS_LOST to our LostListener.  The logic here

               handles the latter case by converting it into the

               former.

             */

            if (n instanceof JMXConnectionNotification

                && n.getType().equals(JMXConnectionNotification.NOTIFS_LOST)) {

                lostListener.handleNotification(n, h);

                return;

            }

            synchronized (result) {

                if (!n.getType().equals("interesting")

                    || !n.getUserData().equals("known")) {

                    System.out.println("TestListener received strange notif: "

                                       + notificationString(n));

                    result.failed = true;

                    result.notifyAll();

                } else {

                    result.knownCount++;

                    if (result.knownCount == NNOTIFS)

                        result.notifyAll();

                }

            }

        }

        private LostListener lostListener;

    }

    private static class LostListener implements NotificationListener {

        public void handleNotification(Notification n, Object h) {

            synchronized (result) {

                handle(n, h);

            }

        }

        private void handle(Notification n, Object h) {

            if (!(n instanceof JMXConnectionNotification)) {

                System.out.println("LostListener received strange notif: " +

                                   notificationString(n));

                result.failed = true;

                result.notifyAll();

                return;

            }

            JMXConnectionNotification jn = (JMXConnectionNotification) n;

            if (!jn.getType().equals(jn.NOTIFS_LOST)) {

                System.out.println("Ignoring JMXConnectionNotification: " +

                                   notificationString(jn));

                return;

            }

            final String msg = jn.getMessage();

            if ((!msg.startsWith("Dropped ")

                 || !msg.endsWith("classes were missing locally"))

                && (!msg.startsWith("Not serializable: "))) {

                System.out.println("Surprising NOTIFS_LOST getMessage: " +

                                   msg);

            }

            if (!(jn.getUserData() instanceof Long)) {

                System.out.println("JMXConnectionNotification userData " +

                                   "not a Long: " + jn.getUserData());

                result.failed = true;

            } else {

                int lost = ((Long) jn.getUserData()).intValue();

                result.lostCount += lost;

                if (result.lostCount == NNOTIFS*2)

                    result.notifyAll();

            }

        }

    }

    private static class TestFilter implements NotificationFilter {

        public boolean isNotificationEnabled(Notification n) {

            return (n.getType().equals("interesting"));

        }

    }

    private static class Result {

        int knownCount, lostCount;

        boolean failed;

    }

    private static Result result;

    /* Send a bunch of notifications to exercise the logic to recover

       from unknown notification classes.  We have four kinds of

       notifications: "known" ones are of a class known to the client

       and which match its filters; "unknown" ones are of a class that

       match the client's filters but that the client can't load;

       "tricky" ones are unserializable; and "boring" notifications

       are of a class that the client knows but that doesn't match its

       filters.  We emit NNOTIFS notifications of each kind.  We do a

       random shuffle on these 4*NNOTIFS notifications so it is likely

       that we will cover the various different cases in the logic.

       Specifically, what we are testing here is the logic that

       recovers from a fetchNotifications request that gets a

       ClassNotFoundException.  Because the request can contain

       several notifications, the client doesn't know which of them

       generated the exception.  So it redoes a request that asks for

       just one notification.  We need to be sure that this works when

       that one notification is of an unknown class and when it is of

       a known class, and in both cases when there are filtered

       notifications that are skipped.

       We are also testing the behaviour in the server when it tries

       to include an unserializable notification in the response to a

       fetchNotifications, and in the client when that happens.

       If the test succeeds, the listener should receive the NNOTIFS

       "known" notifications, and the connection listener should

       receive an indication of NNOTIFS lost notifications

       representing the "unknown" notifications.

       We depend on some implementation-specific features here:

       1. The buffer size is sufficient to contain the 4*NNOTIFS

       notifications which are all sent at once, before the client

       gets a chance to start receiving them.

       2. When one or more notifications are dropped because they are

       of unknown classes, the NOTIFS_LOST notification contains a

       userData that is a Long with a count of the number dropped.

       3. If a notification is not serializable on the server, the

       client gets told about it somehow, rather than having it just

       dropped on the floor.  The somehow might be through an RMI

       exception, or it might be by the server replacing the

       unserializable notif by a JMXConnectionNotification.NOTIFS_LOST.

    */

    private static boolean notifyTest(JMXConnector client,

                                      MBeanServerConnection mbsc)

            throws Exception {

        System.out.println("Send notifications including unknown ones");

        result = new Result();

        LostListener ll = new LostListener();

        client.addConnectionNotificationListener(ll, null, null);

        TestListener nl = new TestListener(ll);

        mbsc.addNotificationListener(on, nl, new TestFilter(), null);

        mbsc.invoke(on, "sendNotifs", NO_OBJECTS, NO_STRINGS);

        // wait for the listeners to receive all their notifs

        // or to fail

        long deadline = System.currentTimeMillis() + 60000;

        long remain;

        while ((remain = deadline - System.currentTimeMillis()) >= 0) {

            synchronized (result) {

                if (result.failed

                    || (result.knownCount >= NNOTIFS

                        && result.lostCount >= NNOTIFS*2))

                    break;

                result.wait(remain);

            }

        }

        Thread.sleep(2);  // allow any spurious extra notifs to arrive

        if (result.failed) {

            System.out.println("TEST FAILS: Notification strangeness");

            return false;

        } else if (result.knownCount == NNOTIFS

                   && result.lostCount == NNOTIFS*2) {

            System.out.println("Success: received known notifications and " +

                               "got NOTIFS_LOST for unknown and " +

                               "unserializable ones");

            return true;

        } else if (result.knownCount >= NNOTIFS

                || result.lostCount >= NNOTIFS*2) {

            System.out.println("TEST FAILS: Received too many notifs: " +

                    "known=" + result.knownCount + "; lost=" + result.lostCount);

            return false;

        } else {

            System.out.println("TEST FAILS: Timed out without receiving " +

                               "all notifs: known=" + result.knownCount +

                               "; lost=" + result.lostCount);

            return false;

        }