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OrchidSocketImpl: don't hold the stream lock whilst calling into stream.

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This commit is contained in:
Mike Hearn 2014-09-10 13:54:36 +02:00
parent 57bec6165b
commit 325cc3e8fa
1 changed files with 69 additions and 62 deletions
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131
orchid/src/com/subgraph/orchid/sockets/OrchidSocketImpl.java
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@ -1,28 +1,22 @@
package com.subgraph.orchid.sockets;
import com.subgraph.orchid.OpenFailedException;
import com.subgraph.orchid.Stream;
import com.subgraph.orchid.Threading;
import com.subgraph.orchid.TorClient;
import java.io.FileDescriptor;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.SocketImpl;
import java.net.SocketOptions;
import java.net.SocketTimeoutException;
import java.net.*;
import java.util.concurrent.TimeoutException;
import com.subgraph.orchid.OpenFailedException;
import com.subgraph.orchid.Stream;
import com.subgraph.orchid.TorClient;
import java.util.concurrent.locks.Lock;
public class OrchidSocketImpl extends SocketImpl {
private final TorClient torClient;
private final Object streamLock = new Object();
private Lock streamLock = Threading.lock("stream");
private Stream stream;
OrchidSocketImpl(TorClient torClient) {
@ -53,16 +47,16 @@ public class OrchidSocketImpl extends SocketImpl {
@Override
protected void connect(String host, int port) throws IOException {
SocketAddress endpoint =
InetSocketAddress.createUnresolved(host, port);
connect(endpoint, 0);
SocketAddress endpoint =
InetSocketAddress.createUnresolved(host, port);
connect(endpoint, 0);
}
@Override
protected void connect(InetAddress address, int port) throws IOException {
SocketAddress endpoint =
InetSocketAddress.createUnresolved(address.getHostAddress(), port);
connect(endpoint, 0);
SocketAddress endpoint =
InetSocketAddress.createUnresolved(address.getHostAddress(), port);
connect(endpoint, 0);
}
@Override
@ -85,20 +79,36 @@ public class OrchidSocketImpl extends SocketImpl {
}
private void doConnect(String host, int port) throws IOException {
synchronized(streamLock) {
if(stream != null) {
throw new SocketException("Already connected");
}
try {
stream = torClient.openExitStreamTo(host, port);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new SocketException("connect() interrupted");
} catch (TimeoutException e) {
throw new SocketTimeoutException();
} catch (OpenFailedException e) {
throw new ConnectException(e.getMessage());
}
Stream stream;
// Try to avoid holding the stream lock here whilst calling into torclient to avoid accidental inversions.
streamLock.lock();
stream = this.stream;
streamLock.unlock();
if (stream != null)
throw new SocketException("Already connected");
try {
stream = torClient.openExitStreamTo(host, port);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new SocketException("connect() interrupted");
} catch (TimeoutException e) {
throw new SocketTimeoutException();
} catch (OpenFailedException e) {
throw new ConnectException(e.getMessage());
}
streamLock.lock();
if (this.stream != null) {
// Raced with another concurrent call.
streamLock.unlock();
stream.close();
} else {
this.stream = stream;
streamLock.unlock();
}
}
@ -117,44 +127,41 @@ public class OrchidSocketImpl extends SocketImpl {
throw new UnsupportedOperationException();
}
private Stream getStream() throws IOException {
streamLock.lock();
try {
if (stream == null)
throw new IOException("Not connected");
return stream;
} finally {
streamLock.unlock();
}
}
@Override
protected InputStream getInputStream() throws IOException {
synchronized (streamLock) {
if(stream == null) {
throw new IOException("Not connected");
}
return stream.getInputStream();
}
return getStream().getInputStream();
}
@Override
protected OutputStream getOutputStream() throws IOException {
synchronized (streamLock) {
if(stream == null) {
throw new IOException("Not connected");
}
return stream.getOutputStream();
}
return getStream().getOutputStream();
}
@Override
protected int available() throws IOException {
synchronized(streamLock) {
if(stream == null) {
throw new IOException("Not connected");
}
return stream.getInputStream().available();
}
return getStream().getInputStream().available();
}
@Override
protected void close() throws IOException {
synchronized (streamLock) {
if(stream != null) {
stream.close();
stream = null;
}
}
Stream toClose;
streamLock.lock();
toClose = this.stream;
this.stream = null;
streamLock.unlock();
if (toClose != null)
toClose.close();
}
@Override
@ -163,10 +170,10 @@ public class OrchidSocketImpl extends SocketImpl {
}
protected void shutdownInput() throws IOException {
//throw new IOException("Method not implemented!");
}
//throw new IOException("Method not implemented!");
}
protected void shutdownOutput() throws IOException {
//throw new IOException("Method not implemented!");
}
//throw new IOException("Method not implemented!");
}
}