author | jlahoda |
Fri, 11 Nov 2016 12:54:47 +0100 | |
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parent 41941 | a935ac3f5274 |
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/* |
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package jdk.jshell.execution; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.ObjectInput; |
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import java.io.ObjectOutput; |
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import java.io.OutputStream; |
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import java.net.InetAddress; |
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import java.net.ServerSocket; |
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import java.net.Socket; |
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import java.security.SecureRandom; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.function.Consumer; |
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import com.sun.jdi.BooleanValue; |
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import com.sun.jdi.ClassNotLoadedException; |
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import com.sun.jdi.Field; |
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import com.sun.jdi.IncompatibleThreadStateException; |
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import com.sun.jdi.InvalidTypeException; |
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import com.sun.jdi.ObjectReference; |
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import com.sun.jdi.StackFrame; |
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import com.sun.jdi.ThreadReference; |
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import com.sun.jdi.VMDisconnectedException; |
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import com.sun.jdi.VirtualMachine; |
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import jdk.jshell.spi.ExecutionControl; |
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import jdk.jshell.spi.ExecutionEnv; |
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import static jdk.jshell.execution.Util.remoteInputOutput; |
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|
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/** |
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* The implementation of {@link jdk.jshell.spi.ExecutionControl} that the |
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* JShell-core uses by default. |
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* Launches a remote process -- the "remote agent". |
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* Interfaces to the remote agent over a socket and via JDI. |
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* Designed to work with {@link RemoteExecutionControl}. |
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* |
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* @author Robert Field |
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* @author Jan Lahoda |
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*/ |
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public class JdiDefaultExecutionControl extends JdiExecutionControl { |
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private static final String REMOTE_AGENT = RemoteExecutionControl.class.getName(); |
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private VirtualMachine vm; |
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private Process process; |
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private final Object STOP_LOCK = new Object(); |
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private boolean userCodeRunning = false; |
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|
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/** |
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* Creates an ExecutionControl instance based on a JDI |
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* {@code LaunchingConnector}. |
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* |
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* @return the generator |
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*/ |
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public static ExecutionControl.Generator launch() { |
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return env -> create(env, true, null); |
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} |
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|
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/** |
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* Creates an ExecutionControl instance based on a JDI |
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* {@code ListeningConnector}. |
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* |
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* @param host explicit hostname to use, if null use discovered |
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* hostname, applies to listening only (!isLaunch) |
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* @return the generator |
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*/ |
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public static ExecutionControl.Generator listen(String host) { |
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return env -> create(env, false, host); |
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} |
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|
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/** |
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* Creates an ExecutionControl instance based on a JDI |
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* {@code ListeningConnector} or {@code LaunchingConnector}. |
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* |
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* Initialize JDI and use it to launch the remote JVM. Set-up a socket for |
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* commands and results. This socket also transports the user |
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* input/output/error. |
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* |
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* @param env the context passed by |
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* {@link jdk.jshell.spi.ExecutionControl#start(jdk.jshell.spi.ExecutionEnv) } |
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* @param isLaunch does JDI do the launch? That is, LaunchingConnector, |
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* otherwise we start explicitly and use ListeningConnector |
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* @param host explicit hostname to use, if null use discovered |
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* hostname, applies to listening only (!isLaunch) |
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* @return the channel |
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* @throws IOException if there are errors in set-up |
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*/ |
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private static ExecutionControl create(ExecutionEnv env, |
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boolean isLaunch, String host) throws IOException { |
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try (final ServerSocket listener = new ServerSocket(0, 1, InetAddress.getLoopbackAddress())) { |
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// timeout after 60 seconds |
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listener.setSoTimeout(60000); |
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int port = listener.getLocalPort(); |
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// Set-up the JDI connection |
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JdiInitiator jdii = new JdiInitiator(port, |
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env.extraRemoteVMOptions(), REMOTE_AGENT, isLaunch, host); |
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VirtualMachine vm = jdii.vm(); |
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Process process = jdii.process(); |
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129 |
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OutputStream processOut = process.getOutputStream(); |
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131 |
SecureRandom rng = new SecureRandom(); |
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byte[] randomBytes = new byte[VERIFY_HASH_LEN]; |
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133 |
|
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rng.nextBytes(randomBytes); |
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processOut.write(randomBytes); |
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136 |
processOut.flush(); |
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137 |
|
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List<Consumer<String>> deathListeners = new ArrayList<>(); |
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deathListeners.add(s -> env.closeDown()); |
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Util.detectJdiExitEvent(vm, s -> { |
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for (Consumer<String> h : deathListeners) { |
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h.accept(s); |
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143 |
} |
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144 |
}); |
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145 |
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146 |
ByteArrayOutputStream receivedRandomBytes = new ByteArrayOutputStream(); |
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147 |
|
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// Set-up the commands/reslts on the socket. Piggy-back snippet |
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// output. |
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Socket socket = listener.accept(); |
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// out before in -- match remote creation so we don't hang |
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OutputStream out = socket.getOutputStream(); |
153 |
Map<String, OutputStream> outputs = new HashMap<>(); |
|
154 |
outputs.put("out", env.userOut()); |
|
155 |
outputs.put("err", env.userErr()); |
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outputs.put("echo", new OutputStream() { |
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157 |
@Override public void write(int b) throws IOException { |
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158 |
synchronized (receivedRandomBytes) { |
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159 |
receivedRandomBytes.write(b); |
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160 |
receivedRandomBytes.notify(); |
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161 |
} |
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162 |
} |
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163 |
}); |
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Map<String, InputStream> input = new HashMap<>(); |
165 |
input.put("in", env.userIn()); |
|
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return remoteInputOutput(socket.getInputStream(), out, outputs, input, (objIn, objOut) -> { |
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synchronized (receivedRandomBytes) { |
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168 |
while (receivedRandomBytes.size() < randomBytes.length) { |
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try { |
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receivedRandomBytes.wait(); |
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171 |
} catch (InterruptedException ex) { |
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172 |
//ignore |
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173 |
} |
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174 |
} |
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175 |
if (!Arrays.equals(receivedRandomBytes.toByteArray(), randomBytes)) { |
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176 |
throw new IllegalStateException("Invalid connection!"); |
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177 |
} |
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178 |
} |
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179 |
return new JdiDefaultExecutionControl(objOut, objIn, vm, process, deathListeners); |
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180 |
}); |
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} |
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182 |
} |
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183 |
//where: |
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184 |
private static final int VERIFY_HASH_LEN = 20; |
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185 |
|
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186 |
/** |
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* Create an instance. |
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188 |
* |
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189 |
* @param cmdout the output for commands |
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190 |
* @param cmdin the input for responses |
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191 |
*/ |
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192 |
private JdiDefaultExecutionControl(ObjectOutput cmdout, ObjectInput cmdin, |
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193 |
VirtualMachine vm, Process process, List<Consumer<String>> deathListeners) { |
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194 |
super(cmdout, cmdin); |
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195 |
this.vm = vm; |
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196 |
this.process = process; |
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197 |
deathListeners.add(s -> disposeVM()); |
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198 |
} |
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199 |
|
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200 |
@Override |
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201 |
public String invoke(String classname, String methodname) |
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202 |
throws RunException, |
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203 |
EngineTerminationException, InternalException { |
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204 |
String res; |
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205 |
synchronized (STOP_LOCK) { |
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206 |
userCodeRunning = true; |
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|
207 |
} |
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208 |
try { |
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209 |
res = super.invoke(classname, methodname); |
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210 |
} finally { |
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211 |
synchronized (STOP_LOCK) { |
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|
212 |
userCodeRunning = false; |
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|
213 |
} |
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214 |
} |
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215 |
return res; |
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|
216 |
} |
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|
217 |
|
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218 |
/** |
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219 |
* Interrupts a running remote invoke by manipulating remote variables |
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220 |
* and sending a stop via JDI. |
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|
221 |
* |
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222 |
* @throws EngineTerminationException the execution engine has terminated |
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223 |
* @throws InternalException an internal problem occurred |
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|
224 |
*/ |
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225 |
@Override |
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226 |
public void stop() throws EngineTerminationException, InternalException { |
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227 |
synchronized (STOP_LOCK) { |
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|
228 |
if (!userCodeRunning) { |
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|
229 |
return; |
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|
230 |
} |
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|
231 |
|
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|
232 |
vm().suspend(); |
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|
233 |
try { |
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|
234 |
OUTER: |
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235 |
for (ThreadReference thread : vm().allThreads()) { |
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236 |
// could also tag the thread (e.g. using name), to find it easier |
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237 |
for (StackFrame frame : thread.frames()) { |
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238 |
if (REMOTE_AGENT.equals(frame.location().declaringType().name()) && |
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239 |
( "invoke".equals(frame.location().method().name()) |
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|
240 |
|| "varValue".equals(frame.location().method().name()))) { |
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|
241 |
ObjectReference thiz = frame.thisObject(); |
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242 |
Field inClientCode = thiz.referenceType().fieldByName("inClientCode"); |
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243 |
Field expectingStop = thiz.referenceType().fieldByName("expectingStop"); |
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244 |
Field stopException = thiz.referenceType().fieldByName("stopException"); |
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245 |
if (((BooleanValue) thiz.getValue(inClientCode)).value()) { |
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246 |
thiz.setValue(expectingStop, vm().mirrorOf(true)); |
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247 |
ObjectReference stopInstance = (ObjectReference) thiz.getValue(stopException); |
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248 |
|
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249 |
vm().resume(); |
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|
250 |
debug("Attempting to stop the client code...\n"); |
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251 |
thread.stop(stopInstance); |
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252 |
thiz.setValue(expectingStop, vm().mirrorOf(false)); |
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|
253 |
} |
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|
254 |
|
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|
255 |
break OUTER; |
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|
256 |
} |
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|
257 |
} |
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|
258 |
} |
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259 |
} catch (ClassNotLoadedException | IncompatibleThreadStateException | InvalidTypeException ex) { |
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260 |
throw new InternalException("Exception on remote stop: " + ex); |
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261 |
} finally { |
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vm().resume(); |
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} |
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} |
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} |
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|
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@Override |
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public void close() { |
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super.close(); |
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disposeVM(); |
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} |
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|
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private synchronized void disposeVM() { |
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try { |
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if (vm != null) { |
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vm.dispose(); // This could NPE, so it is caught below |
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vm = null; |
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} |
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} catch (VMDisconnectedException ex) { |
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// Ignore if already closed |
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} catch (Throwable ex) { |
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debug(ex, "disposeVM"); |
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} finally { |
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if (process != null) { |
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process.destroy(); |
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process = null; |
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} |
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} |
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} |
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290 |
|
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@Override |
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protected synchronized VirtualMachine vm() throws EngineTerminationException { |
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if (vm == null) { |
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throw new EngineTerminationException("VM closed"); |
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} else { |
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return vm; |
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} |
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} |
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299 |
|
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/** |
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* Log debugging information. Arguments as for {@code printf}. |
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* |
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* @param format a format string as described in Format string syntax |
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* @param args arguments referenced by the format specifiers in the format |
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* string. |
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*/ |
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private static void debug(String format, Object... args) { |
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// Reserved for future logging |
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} |
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|
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/** |
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* Log a serious unexpected internal exception. |
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* |
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* @param ex the exception |
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* @param where a description of the context of the exception |
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*/ |
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private static void debug(Throwable ex, String where) { |
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// Reserved for future logging |
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} |
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|
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} |