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package org.gnunet.util;
import org.gnunet.construct.Construct;
import org.gnunet.construct.Message;
import org.gnunet.construct.MessageLoader;
import org.gnunet.construct.ProtocolViolationException;
import org.gnunet.mq.Envelope;
import org.gnunet.mq.MessageQueue;
import java.io.IOError;
import java.io.IOException;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.EnumSet;
import java.util.LinkedList;
import java.util.List;
/**
* Process that we can communicate with standard GNUnet messages over stdin/stdout.
*/
public class Helper extends MessageQueue {
private final ProcessBuilder processBuilder;
private final RunaboutMessageReceiver receiver;
private Process process;
private volatile GnunetMessage.Body writeMessage;
private final class WriteThread implements Runnable {
@Override
public void run() {
GnunetMessage.Body msg;
while (true) {
synchronized (Helper.this) {
while (writeMessage == null) {
try {
wait();
} catch (InterruptedException e) {
// do nothing
}
}
// we now have a message we can send
msg = writeMessage;
writeMessage = null;
// somebody can set the next send message
}
byte[] data = Construct.toBinary(GnunetMessage.fromBody(msg));
try {
process.getOutputStream().write(data);
} catch (IOException e) {
// fixme: what now?
}
Scheduler.addContinuation(new Scheduler.Task() {
@Override
public void run(Scheduler.RunContext ctx) {
reportMessageSent();
}
}, EnumSet.noneOf(Scheduler.Reason.class));
}
}
}
private final class ReadThread implements Runnable {
private ByteBuffer buffer;
ReadableByteChannel channel;
private void fillBuffer() {
while (buffer.hasRemaining()) {
try {
channel.read(buffer);
} catch (IOException e) {
// FIXME
return;
}
}
}
private void scheduleInvokeReceiver(final GnunetMessage.Body body) {
Scheduler.addContinuation(new Scheduler.Task() {
@Override
public void run(Scheduler.RunContext ctx) {
receiver.process(body);
}
}, EnumSet.noneOf(Scheduler.Reason.class));
}
@Override
public void run() {
// allocate just enough for the message header
buffer = ByteBuffer.allocate(4);
channel = Channels.newChannel(process.getInputStream());
while (true) {
buffer.clear();
buffer.limit(4);
fillBuffer();
buffer.rewind();
GnunetMessage.Header msgh = Construct.parseAs(buffer, GnunetMessage.Header.class);
if (msgh.messageSize > GnunetMessage.Header.SIZE) {
if (buffer.capacity() < msgh.messageSize) {
ByteBuffer newBuf = ByteBuffer.allocate(msgh.messageSize);
buffer.flip();
newBuf.put(buffer);
buffer = newBuf;
}
buffer.limit(msgh.messageSize);
fillBuffer();
}
// we now have a complete message
// prepare for reading again
buffer.flip();
boolean found = true;
Class unionClass = null;
try {
unionClass = MessageLoader.getUnionClass(GnunetMessage.Body.class, msgh.messageType);
} catch (ProtocolViolationException e) {
found = false;
}
if (found) {
GnunetMessage msg;
msg = Construct.parseAs(buffer, GnunetMessage.class);
scheduleInvokeReceiver(msg.body);
} else {
UnknownMessageBody b = new UnknownMessageBody();
b.id = msgh.messageType;
scheduleInvokeReceiver(b);
}
}
}
}
public Helper(boolean withControlPipe, String binaryName, List<String> argv,
RunaboutMessageReceiver receiver) {
this.receiver = receiver;
List<String> command = new LinkedList<String>();
if (binaryName == null) {
throw new AssertionError();
}
command.add(binaryName);
if (argv != null)
command.addAll(argv);
processBuilder = new ProcessBuilder(command);
try {
process = processBuilder.start();
} catch (IOException e) {
throw new IOError(e);
}
}
/**
* Sends termination signal to the helper process. The helper process is not
* reaped; call GNUNET_HELPER_wait() for reaping the dead helper process.
*
* @param softkill if GNUNET_YES, signals termination by closing the helper's
* stdin; GNUNET_NO to signal termination by sending SIGTERM to helper
* @return true on success, false on failure
*/
public boolean kill(boolean softkill) {
if (softkill) {
try {
process.getInputStream().close();
} catch (IOException e) {
return false;
}
return true;
}
process.destroy();
return true;
}
/**
* Reap the helper process. This call is blocking(!). The helper process
* should either be sent a termination signal before or should be dead before
* calling this function
*
* @return true on success, false on failure
*/
public boolean waitFor() {
try {
process.waitFor();
} catch (InterruptedException e) {
return false;
}
return true;
}
@Override
protected void submit(Envelope ev) {
synchronized (this) {
if (writeMessage != null)
throw new AssertionError("message queue not implemented correctly");
writeMessage = ev.message;
notifyAll();
}
}
@Override
protected void retract() {
synchronized (this) {
writeMessage = null;
}
}
}
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