/* ProcessAssassin.java
Copyright (C) 2011,2012 Red Hat, Inc.

This file is part of IcedTea.

IcedTea is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, version 2.

IcedTea 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 for more details.

You should have received a copy of the GNU General Public License along with
IcedTea; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is making a
combined work based on this library. Thus, the terms and conditions of the GNU
General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules, and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms and
conditions of the license of that module. An independent module is a module
which is not derived from or based on this library. If you modify this library,
you may extend this exception to your version of the library, but you are not
obligated to do so. If you do not wish to do so, delete this exception
statement from your version.
*/
package net.adoptopenjdk.icedteaweb.testing;

import net.adoptopenjdk.icedteaweb.testing.browsertesting.ReactingProcess;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

/**
 * class which timeout any ThreadedProcess. This killing of 'thread with
 * process' replaced not working process.destroy().
 */
public class ProcessAssassin extends Thread {

    private long timeout;
    private final ThreadedProcess p;
    //false == is disabled:(
    private boolean canRun = true;
    private boolean wasTerminated = false;
    //signifies that assassin have been summoned
    private volatile boolean killing = false;
    //signifies that assassin have done its job
    private volatile boolean killed = false;

    private ReactingProcess reactingProcess;

    public ProcessAssassin(ThreadedProcess p, long timeout) {
        this.p = (p);
        this.timeout = timeout;
    }


    public void setCanRun(final boolean canRun) {
        this.canRun = canRun;
        if (p != null) {
            if (p.getP() != null) {
                ServerAccess.logNoReprint("Stopping assassin for" + p.toString() + " " + p.getP().toString() + " " + p.getCommandLine() + ": ");
            } else {
                ServerAccess.logNoReprint("Stopping assassin for" + p.toString() + " " + p.getCommandLine() + ": ");
            }
        } else {
            ServerAccess.logNoReprint("Stopping assassin for null job: ");
        }
    }

    public boolean wasTerminated() {
        return wasTerminated;
    }

    void setTimeout() {
        this.timeout = Long.MIN_VALUE;
    }

    @Override
    public void run() {
        final long startTime = System.nanoTime() / ServerAccess.NANO_TIME_DELIMITER;
        while (canRun) {
            try {
                final long time = System.nanoTime() / ServerAccess.NANO_TIME_DELIMITER;
                //ServerAccess.logOutputReprint(time - startTime);
                //ServerAccess.logOutputReprint((time - startTime) > timeout);
                if ((time - startTime) > timeout) {
                    try {
                        if (p != null) {
                            if (p.getP() != null) {
                                ServerAccess.logErrorReprint("Timed out " + p.toString() + " " + p.getP().toString() + " .. killing " + p.getCommandLine() + ": ");
                            } else {
                                ServerAccess.logErrorReprint("Timed out " + p.toString() + " " + "null  .. killing " + p.getCommandLine() + ": ");
                            }
                            wasTerminated = true;
                            if (p.getP() != null) {
                                try {
                                    /*
      if this is true, then process is not destroyed after timeout, but just
      left to its own destiny. Its stdout/err is no longer recorded, and it is
      leaking system resources until it dies by itself The control is returned
      to main thread with all information recorded until now. You will be
      able to listen to std out from listeners still
     */
                                    destroyProcess();
                                } catch (final Throwable ex) {
                                    if (p.deadlyException == null) {
                                        p.deadlyException = ex;
                                    }
                                    ex.printStackTrace();
                                }
                            }
                            p.interrupt();
//                            while (!ServerAccess.terminated.contains(p)) {
//                                Thread.sleep(100);
//                            }
                            if (p.getP() != null) {
                                ServerAccess.logErrorReprint("Timed out " + p.toString() + " " + p.getP().toString() + " .. killed " + p.getCommandLine());
                            } else {
                                ServerAccess.logErrorReprint("Timed out " + p.toString() + " null  .. killed " + p.getCommandLine());
                            }
                        } else {
                            ServerAccess.logErrorReprint("Timed out null job");
                        }
                        break;
                    } finally {
                        p.setDestroyed(true);
                    }
                }
                Thread.sleep(100);
            } catch (final Exception ex) {
                ex.printStackTrace();
            }
        }
        if (p != null) {
            if (p.getP() != null) {
                ServerAccess.logNoReprint("assassin for" + p.toString() + " " + p.getP().toString() + " .. done " + p.getCommandLine() + "  termination " + wasTerminated);
            } else {
                ServerAccess.logNoReprint("assassin for" + p.toString() + " null .. done " + p.getCommandLine() + "  termination " + wasTerminated);
            }
        } else {
            ServerAccess.logNoReprint("assassin for non existing job  termination " + wasTerminated);
        }
    }

    private void destroyProcess() {
        try {
            killing = true;
            destroyProcess(p, reactingProcess);
        } finally {
            killed = true;
        }
    }

    public boolean haveKilled() {
        return killed;
    }

    public boolean isKilling() {
        return killing;
    }


    private static void destroyProcess(final ThreadedProcess pp, final ReactingProcess reactingProcess) {
        final Process p = pp.getP();
        try {
            final Field f = p.getClass().getDeclaredField("pid");
            f.setAccessible(true);
            final String pid = (f.get(p)).toString();
//            sigInt(pid);
            sigTerm(pid);
        } catch (final Exception ex) {
            ServerAccess.logException(ex);
        } finally {
            if (reactingProcess != null) {
                reactingProcess.afterKill("");
            }
        }
    }

    private static void sigTerm(final String pid) throws Exception {
        final List<String> ll = new ArrayList<>(4);
        ll.add("kill");
        ll.add("-s");
        ll.add("SIGTERM");
        ll.add(pid);
        ServerAccess.executeProcess(ll); //sync, but  actually release
        //before affected application close
        Thread.sleep(1000);
    }

    void setReactingProcess(final ReactingProcess reactingProcess) {
        this.reactingProcess = reactingProcess;
    }
}
