/*

 * Copyright (c) 1999, 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.

 */

import com.sun.jdi.*;

import com.sun.jdi.connect.*;

import com.sun.jdi.request.EventRequestManager;

import java.util.*;

import java.io.*;

/**

 * Manages a VM conection for the JDI test framework.

 */

class VMConnection {

    private VirtualMachine vm;

    private Process process = null;

    private int outputCompleteCount = 0;

    private final Connector connector;

    private final Map connectorArgs;

    private final int traceFlags;

    /**

     * Return a String containing VM Options to pass to the debugee

     * or an empty string if there are none.

     * These are read from the first non-comment line

     * in file @debuggeeVMOptions in the test.classes dir

     */

    static public String getDebuggeeVMOptions() {

        String retVal = "";

        // When we run under jtreg, test.classes contains the pathname of

        // the dir in which the .class files will be placed.

        BufferedReader reader;

        String testClasses = System.getProperty("test.classes");

        if (testClasses == null) {

            return retVal;

        }

        retVal += "-classpath " + testClasses + " ";

        File myFile = new File(testClasses, "@debuggeeVMOptions");

        if (!myFile.canRead()) {

            // Not there - look in parent (in case we are in a subdir)

            myFile = new File(testClasses);

            String parentDir = myFile.getParent();

            if (parentDir != null) {

                myFile = new File(parentDir, "@debuggeeVMOptions");

                if (!myFile.canRead()) {

                    return retVal;

                }

            }

        }

        String wholePath = myFile.getPath();

        try {

            reader = new BufferedReader(new FileReader(myFile));

        } catch (FileNotFoundException ee) {

            System.out.println("-- Error 2 trying to access file " +

                               wholePath + ": " + ee);

            return retVal;

        }

        String line;

        while (true) {

            try {

                line = reader.readLine();

            } catch (IOException ee) {

                System.out.println("-- Error reading options from file " +

                                   wholePath + ": " + ee);

                break;

            }

            if (line == null) {

                System.out.println("-- No debuggee VM options found in file " +

                                   wholePath);

                break;

            }

            line = line.trim();

            if (line.length() != 0 && !line.startsWith("#")) {

                System.out.println("-- Added debuggeeVM options from file " +

                                   wholePath + ": " + line);

                retVal += line;

                break;

            }

            // Else, read he next line.

        }

        try {

            reader.close();

        } catch (IOException ee) {

        }

        return retVal;

    }

    static public String[] insertDebuggeeVMOptions(String[] cmdLine) {

        String opts = getDebuggeeVMOptions();

        if (opts.equals("")) {

            return cmdLine;

        }

        // Insert the options at position 1.  Blanks in args are not allowed!

        String[] v1 = opts.split(" +");

        String[] retVal = new String[cmdLine.length + v1.length];

        retVal[0] = cmdLine[0];

        System.arraycopy(v1, 0, retVal, 1, v1.length);

        System.arraycopy(cmdLine, 1, retVal, v1.length + 1, cmdLine.length - 1);

        return retVal;

    }

    private Connector findConnector(String name) {

        List connectors = Bootstrap.virtualMachineManager().allConnectors();

        Iterator iter = connectors.iterator();

        while (iter.hasNext()) {

            Connector connector = (Connector)iter.next();

            if (connector.name().equals(name)) {

                return connector;

            }

        }

        return null;

    }

    private Map parseConnectorArgs(Connector connector, String argString) {

        StringTokenizer tokenizer = new StringTokenizer(argString, ",");

        Map arguments = connector.defaultArguments();

        while (tokenizer.hasMoreTokens()) {

            String token = tokenizer.nextToken();

            int index = token.indexOf('=');

            if (index == -1) {

                throw new IllegalArgumentException("Illegal connector argument: " +

                                                   token);

            }

            String name = token.substring(0, index);

            String value = token.substring(index + 1);

            Connector.Argument argument = (Connector.Argument)arguments.get(name);

            if (argument == null) {

                throw new IllegalArgumentException("Argument " + name +

                                               "is not defined for connector: " +

                                               connector.name());

            }

            argument.setValue(value);

        }

        return arguments;

    }

    VMConnection(String connectSpec, int traceFlags) {

        String nameString;

        String argString;

        int index = connectSpec.indexOf(':');

        if (index == -1) {

            nameString = connectSpec;

            argString = "";

        } else {

            nameString = connectSpec.substring(0, index);

            argString = connectSpec.substring(index + 1);

        }

        connector = findConnector(nameString);

        if (connector == null) {

            throw new IllegalArgumentException("No connector named: " +

                                               nameString);

        }

        connectorArgs = parseConnectorArgs(connector, argString);

        this.traceFlags = traceFlags;

    }

    synchronized VirtualMachine open() {

        if (connector instanceof LaunchingConnector) {

            vm = launchTarget();

        } else if (connector instanceof AttachingConnector) {

            vm = attachTarget();

        } else if (connector instanceof ListeningConnector) {

            vm = listenTarget();

        } else {

            throw new InternalError("Invalid connect type");

        }

        vm.setDebugTraceMode(traceFlags);

        System.out.println("JVM version:" + vm.version());

        System.out.println("JDI version: " + Bootstrap.virtualMachineManager().majorInterfaceVersion() +

                           "." + Bootstrap.virtualMachineManager().minorInterfaceVersion());

        System.out.println("JVM description: " + vm.description());

        return vm;

    }

    boolean setConnectorArg(String name, String value) {

        /*

         * Too late if the connection already made

         */

        if (vm != null) {

            return false;

        }

        Connector.Argument argument = (Connector.Argument)connectorArgs.get(name);

        if (argument == null) {

            return false;

        }

        argument.setValue(value);

        return true;

    }

    String connectorArg(String name) {

        Connector.Argument argument = (Connector.Argument)connectorArgs.get(name);

        if (argument == null) {

            return "";

        }

        return argument.value();

    }

    public synchronized VirtualMachine vm() {

        if (vm == null) {

            throw new InternalError("VM not connected");

        } else {

            return vm;

        }

    }

    boolean isOpen() {

        return (vm != null);

    }

    boolean isLaunch() {

        return (connector instanceof LaunchingConnector);

    }

    Connector connector() {

        return connector;

    }

    boolean isListen() {

        return (connector instanceof ListeningConnector);

    }

    boolean isAttach() {

        return (connector instanceof AttachingConnector);

    }

    private synchronized void notifyOutputComplete() {

        outputCompleteCount++;

        notifyAll();

    }

    private synchronized void waitOutputComplete() {

        // Wait for stderr and stdout

        if (process != null) {

            while (outputCompleteCount < 2) {

                try {wait();} catch (InterruptedException e) {}

            }

        }

    }

    public void disposeVM() {

        try {

            if (vm != null) {

                vm.dispose();

                vm = null;

            }

        } finally {

            if (process != null) {

                process.destroy();

                process = null;

            }

            waitOutputComplete();

        }

    }

    private void dumpStream(InputStream stream) throws IOException {

                PrintStream outStream = System.out;

                BufferedReader in =

                        new BufferedReader(new InputStreamReader(stream));

                String line;

                while(true){

                      try{

                          line = in.readLine();

                          if( line == null ){

                              break;

                          }

                          outStream.println(line);

                      }

                      catch(IOException ieo){

                           /**

                            * IOException with "Bad file number..." can happen

                            * when the debuggee process is destroyed. Ignore such exception.

                            *

                           */

                           String s = ieo.getMessage();

                           if( s.startsWith("Bad file number") ){

                               break;

                           }

                           throw ieo;

                      }

                      catch(NullPointerException npe){

                          throw new IOException("Bug 4728096 in Java io may cause in.readLine() to throw a NULL pointer exception");

                      }

                }

    }

    /**

     *  Create a Thread that will retrieve and display any output.

     *  Needs to be high priority, else debugger may exit before

     *  it can be displayed.

     */

    private void displayRemoteOutput(final InputStream stream) {

        Thread thr = new Thread("output reader") {

            public void run() {

                try {

                    dumpStream(stream);

                } catch (IOException ex) {

                    System.err.println("IOException reading output of child java interpreter:"

                                       + ex.getMessage());

                } finally {

                    notifyOutputComplete();

                }

            }

        };

        thr.setPriority(Thread.MAX_PRIORITY-1);

        thr.start();

    }

    private void dumpFailedLaunchInfo(Process process) {

        try {

            dumpStream(process.getErrorStream());

            dumpStream(process.getInputStream());

        } catch (IOException e) {

            System.err.println("Unable to display process output: " +

                               e.getMessage());

        }

    }

    /* launch child target vm */

    private VirtualMachine launchTarget() {

        LaunchingConnector launcher = (LaunchingConnector)connector;

        try {

            VirtualMachine vm = launcher.launch(connectorArgs);

            process = vm.process();

            displayRemoteOutput(process.getErrorStream());

            displayRemoteOutput(process.getInputStream());

            return vm;

        } catch (IOException ioe) {

            ioe.printStackTrace();

            System.err.println("\n Unable to launch target VM.");

        } catch (IllegalConnectorArgumentsException icae) {

            icae.printStackTrace();

            System.err.println("\n Internal debugger error.");

        } catch (VMStartException vmse) {

            System.err.println(vmse.getMessage() + "\n");

            dumpFailedLaunchInfo(vmse.process());

            System.err.println("\n Target VM failed to initialize.");

        }

        return null; // Shuts up the compiler

    }

    /* attach to running target vm */

    private VirtualMachine attachTarget() {

        AttachingConnector attacher = (AttachingConnector)connector;

        try {

            return attacher.attach(connectorArgs);

        } catch (IOException ioe) {

            ioe.printStackTrace();

            System.err.println("\n Unable to attach to target VM.");

        } catch (IllegalConnectorArgumentsException icae) {

            icae.printStackTrace();

            System.err.println("\n Internal debugger error.");

        }

        return null; // Shuts up the compiler

    }

    /* listen for connection from target vm */

    private VirtualMachine listenTarget() {

        ListeningConnector listener = (ListeningConnector)connector;

        try {

            String retAddress = listener.startListening(connectorArgs);

            System.out.println("Listening at address: " + retAddress);

            vm = listener.accept(connectorArgs);

            listener.stopListening(connectorArgs);

            return vm;

        } catch (IOException ioe) {

            ioe.printStackTrace();

            System.err.println("\n Unable to attach to target VM.");

        } catch (IllegalConnectorArgumentsException icae) {

            icae.printStackTrace();

            System.err.println("\n Internal debugger error.");

        }

        return null; // Shuts up the compiler

    }

}