/*

 * Copyright (c) 2018, 2019, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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

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 */

package jdk.jfr.event.io;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.RandomAccessFile;

import java.lang.instrument.ClassFileTransformer;

import java.lang.instrument.Instrumentation;

import java.net.ServerSocket;

import java.net.Socket;

import java.security.ProtectionDomain;

import java.util.concurrent.CountDownLatch;

import jdk.test.lib.Utils;

/**

 * @test

 * @key jfr

 * @summary This test runs JFR with a javaagent that reads/writes files and

 * sockets during every class definition. This is to verify that the i/o

 * instrumentation in JFR does not interfere with javaagents.

 * @requires vm.hasJFR

 *

 * @library /test/lib /test/jdk

 * @modules java.instrument

 *

 * @build jdk.jfr.event.io.EvilInstrument

 * @run shell MakeJAR.sh EvilInstrument 'Can-Redefine-Classes: true'

 * @run main/othervm -javaagent:EvilInstrument.jar jdk.jfr.event.io.EvilInstrument

 */

public class EvilInstrument {

    CountDownLatch socketEchoReady = new CountDownLatch(1);

    ServerSocket ss;

    /**

     * Thread that echos everything from a socket.

     */

    class SocketEcho extends Thread

    {

        public SocketEcho() {

            setDaemon(true);

        }

        public void run() {

            try {

                Socket s = ss.accept();

                OutputStream os = s.getOutputStream();

                InputStream is = s.getInputStream();

                socketEchoReady.countDown();

                for(;;) {

                    int b = is.read();

                    os.write(b);

                }

            } catch(Exception ex) {

                ex.printStackTrace();

                System.exit(1);

            }

        }

    }

    public static File createScratchFile() throws IOException {

        return Utils.createTempFile("EvilTransformer", null).toFile();

    }

    class EvilTransformer implements ClassFileTransformer {

        File scratch;

        Socket s;

        volatile boolean inited = false;

        public EvilTransformer() throws Exception {

            scratch = createScratchFile();

            ss = new ServerSocket(0);

            new SocketEcho().start();

            s = new Socket(ss.getInetAddress(), ss.getLocalPort());

            socketEchoReady.await();

            inited = true;

        }

        public byte[] transform(ClassLoader loader, String className,

                                Class<?> classBeingRedefined,

                                ProtectionDomain protectionDomain,

                                byte[] classfileBuffer)

        {

            if (!inited) {

                return null;

            }

            // Do i/o operations during every transform call.

            try {

                FileOutputStream fos = new FileOutputStream(scratch);

                fos.write(31);

                fos.close();

                FileInputStream fis = new FileInputStream(scratch);

                fis.read();

                fis.close();

                RandomAccessFile raf = new RandomAccessFile(scratch, "rw");

                raf.read();

                raf.write(31);

                raf.close();

                s.getOutputStream().write(31);

                s.getInputStream().read();

            } catch(Exception ex) {

                ex.printStackTrace();

                System.exit(1);

            }

            return null;

        }

    }

    public static void premain(String agentArgs, Instrumentation inst) {

        new EvilInstrument().addTransformer(inst);

    }

    private void addTransformer(Instrumentation inst) {

        try {

            inst.addTransformer(new EvilTransformer());

        } catch(Exception ex) {

            ex.printStackTrace();

            System.exit(1);

        }

    }

    public static void main(String... args) throws Exception {

        System.out.println("Hello");

    }

}