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Java library to create Telegram Clients
/*
* Created on Sep 24, 2008
*/
package jawnae.pyronet;
import org.telegram.mtproto.transport.ByteBufferDesc;
import java.io.EOFException;
import java.io.IOException;
import java.net.ConnectException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.NotYetConnectedException;
import java.nio.channels.SelectionKey;
import java.nio.channels.SocketChannel;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
public class PyroClient
{
private final PyroSelector selector;
private final SelectionKey key;
private final ByteStream outbound;
// called by PyroSelector.connect()
PyroClient(PyroSelector selector, InetSocketAddress bind, InetSocketAddress host) throws IOException
{
this(selector, PyroClient.bindAndConfigure(selector, SocketChannel.open(), bind));
((SocketChannel) this.key.channel()).connect(host);
}
// called by PyroClient and PyroServer
PyroClient(PyroSelector selector, SelectionKey key)
{
this.selector = selector;
this.selector.checkThread();
this.key = key;
this.key.attach(this);
this.outbound = new ByteStream();
this.listeners = new CopyOnWriteArrayList();
this.lastEventTime = System.currentTimeMillis();
}
//
private final List listeners;
public void addListener(PyroClientListener listener)
{
this.selector.checkThread();
this.listeners.add(listener);
}
public void removeListener(PyroClientListener listener)
{
this.selector.checkThread();
this.listeners.remove(listener);
}
public void removeListeners()
{
this.selector.checkThread();
this.listeners.clear();
}
/**
* Returns the PyroSelector that created this client
*/
public PyroSelector selector()
{
return this.selector;
}
//
private Object attachment;
/**
* Attach any object to a client, for example to store session information
*/
public void attach(Object attachment)
{
this.attachment = attachment;
}
/**
* Returns the previously attached object, or null if none is set
*/
public T attachment()
{
return (T) this.attachment;
}
//
/**
* Returns the local socket address (host+port)
*/
public InetSocketAddress getLocalAddress()
{
Socket s = ((SocketChannel) key.channel()).socket();
return (InetSocketAddress) s.getLocalSocketAddress();
}
/**
* Returns the remove socket address (host+port)
*/
public InetSocketAddress getRemoteAddress()
{
Socket s = ((SocketChannel) key.channel()).socket();
return (InetSocketAddress) s.getRemoteSocketAddress();
}
//
public void setTimeout(int ms) throws IOException
{
this.selector.checkThread();
((SocketChannel) key.channel()).socket().setSoTimeout(ms);
// prevent a call to setTimeout from immediately causing a timeout
this.lastEventTime = System.currentTimeMillis();
this.timeout = ms;
}
public void setLinger(boolean enabled, int seconds) throws IOException
{
this.selector.checkThread();
((SocketChannel) key.channel()).socket().setSoLinger(enabled, seconds);
}
public void setKeepAlive(boolean enabled) throws IOException
{
this.selector.checkThread();
((SocketChannel) key.channel()).socket().setKeepAlive(enabled);
}
//
//
//
private boolean doEagerWrite = false;
/**
* If enabled, causes calls to write() to make an attempt to write the bytes,
* without waiting for the selector to signal writable state.
*/
public void setEagerWrite(boolean enabled)
{
this.doEagerWrite = enabled;
}
//
/**
* Will enqueue the bytes to send them
* 1. when the selector is ready to write, if eagerWrite is disabled (default)
* 2. immediately, if eagerWrite is enabled
* The ByteBuffer instance is kept, not copied, and thus should not be modified
* @throws PyroException when shutdown() has been called.
*/
public void write(ByteBufferDesc data) throws PyroException {
this.selector.checkThread();
if (!this.key.isValid()) {
// graceful, as this is meant to be async
return;
}
if (this.doShutdown)
{
throw new PyroException("shutting down");
}
this.outbound.append(data);
if (this.doEagerWrite)
{
try
{
this.onReadyToWrite(System.currentTimeMillis());
}
catch (NotYetConnectedException exc)
{
this.adjustWriteOp();
}
catch (IOException exc)
{
this.onConnectionError(exc);
key.cancel();
}
}
else
{
this.adjustWriteOp();
}
}
/**
* Writes as many as possible bytes to the socket buffer
*/
public int flush()
{
int total = 0;
while (this.outbound.hasData())
{
int written;
try
{
written = this.onReadyToWrite(System.currentTimeMillis());
}
catch (IOException exc)
{
written = 0;
}
if (written == 0)
{
break;
}
total += written;
}
return total;
}
/**
* Makes an attempt to write all outbound
* bytes, fails on failure.
*
* @throws PyroException on failure
*/
public int flushOrDie() throws PyroException
{
int total = 0;
while (this.outbound.hasData())
{
int written;
try
{
written = this.onReadyToWrite(System.currentTimeMillis());
}
catch (IOException exc)
{
written = 0;
}
if (written == 0)
{
throw new PyroException("failed to flush, wrote " + total + " bytes");
}
total += written;
}
return total;
}
/**
* Returns whether there are bytes left in the
* outbound queue.
*/
public boolean hasDataEnqueued()
{
this.selector.checkThread();
return this.outbound.hasData();
}
private boolean doShutdown = false;
/**
* Gracefully shuts down the connection. The connection
* is closed after the last outbound bytes are sent.
* Enqueuing new bytes after shutdown, is not allowed
* and will throw an exception
*/
public void shutdown()
{
this.selector.checkThread();
this.doShutdown = true;
if (!this.hasDataEnqueued())
{
this.dropConnection();
}
}
/**
* Immediately drop the connection, regardless of any
* pending outbound bytes. Actual behaviour depends on
* the socket linger settings.
*/
public void dropConnection()
{
this.selector.checkThread();
if (this.isDisconnected())
{
return;
}
Runnable drop = new Runnable()
{
@Override
@SuppressWarnings("synthetic-access")
public void run()
{
try
{
if (key.channel().isOpen())
{
key.channel().close();
}
}
catch (IOException exc)
{
selector().scheduleTask(this);
}
}
};
drop.run();
this.onConnectionError("local");
}
/**
* Returns whether the connection is connected to a remote client.
*/
public boolean isDisconnected()
{
this.selector.checkThread();
return !this.key.channel().isOpen();
}
//
void onInterestOp(long now)
{
if (!key.isValid())
{
this.onConnectionError("remote");
}
else
{
try
{
if (key.isConnectable())
this.onReadyToConnect(now);
if (key.isReadable())
this.onReadyToRead(now);
if (key.isWritable())
this.onReadyToWrite(now);
}
catch (IOException exc)
{
this.onConnectionError(exc);
key.cancel();
}
}
}
private long timeout = 0L;
private long lastEventTime;
boolean didTimeout(long now) {
return this.timeout != 0 && (now - this.lastEventTime) > this.timeout;
}
private void onReadyToConnect(long now) throws IOException
{
this.selector.checkThread();
this.lastEventTime = now;
this.selector.adjustInterestOp(key, SelectionKey.OP_CONNECT, false);
((SocketChannel) key.channel()).finishConnect();
for (PyroClientListener listener : this.listeners)
listener.connectedClient(this);
}
private void onReadyToRead(long now) throws IOException
{
this.selector.checkThread();
this.lastEventTime = now;
SocketChannel channel = (SocketChannel) key.channel();
ByteBuffer buffer = this.selector.networkBuffer;
// read from channel
buffer.clear();
int bytes = channel.read(buffer);
if (bytes == -1)
throw new EOFException();
buffer.flip();
for (PyroClientListener listener : this.listeners)
listener.receivedData(this, buffer);
}
private int onReadyToWrite(long now) throws IOException
{
this.selector.checkThread();
//this.lastEventTime = now;
int sent = 0;
// copy outbound bytes into network buffer
ByteBuffer buffer = this.selector.networkBuffer;
buffer.clear();
this.outbound.get(buffer);
buffer.flip();
// write to channel
if (buffer.hasRemaining())
{
SocketChannel channel = (SocketChannel) key.channel();
sent = channel.write(buffer);
}
if (sent > 0)
{
this.outbound.discard(sent);
}
for (PyroClientListener listener : this.listeners)
listener.sentData(this, sent);
this.adjustWriteOp();
if (this.doShutdown && !this.outbound.hasData())
{
this.dropConnection();
}
return sent;
}
void onConnectionError(final Object cause)
{
this.selector.checkThread();
try
{
// if the key is invalid, the channel may remain open!!
this.key.channel().close();
}
catch (IOException exc)
{
// type: java.io.IOException
// message: "A non-blocking socket operation could not be completed immediately"
// try again later
this.selector.scheduleTask(new Runnable()
{
@Override
public void run()
{
PyroClient.this.onConnectionError(cause);
}
});
return;
}
if (cause instanceof ConnectException)
{
for (PyroClientListener listener : this.listeners)
listener.unconnectableClient(this, (Exception)cause);
}
else if (cause instanceof EOFException) // after read=-1
{
for (PyroClientListener listener : this.listeners)
listener.disconnectedClient(this);
}
else if (cause instanceof IOException)
{
for (PyroClientListener listener : this.listeners)
listener.droppedClient(this, (IOException) cause);
}
else if (!(cause instanceof String))
{
for (PyroClientListener listener: this.listeners)
listener.unconnectableClient(this, null);
}
else if (cause.equals("local"))
{
for (PyroClientListener listener : this.listeners)
listener.disconnectedClient(this);
}
else if (cause.equals("remote"))
{
for (PyroClientListener listener : this.listeners)
listener.droppedClient(this, null);
}
else
{
throw new IllegalStateException("illegal cause: " + cause);
}
}
public String toString()
{
return this.getClass().getSimpleName() + "[" + this.getAddressText() + "]";
}
private final String getAddressText()
{
if (!this.key.channel().isOpen())
return "closed";
InetSocketAddress sockaddr = this.getRemoteAddress();
if (sockaddr == null)
return "connecting";
InetAddress inetaddr = sockaddr.getAddress();
return inetaddr.getHostAddress() + "@" + sockaddr.getPort();
}
//
void adjustWriteOp()
{
this.selector.checkThread();
boolean interested = this.outbound.hasData();
this.selector.adjustInterestOp(this.key, SelectionKey.OP_WRITE, interested);
}
static final SelectionKey bindAndConfigure(PyroSelector selector, SocketChannel channel, InetSocketAddress bind) throws IOException
{
selector.checkThread();
channel.socket().bind(bind);
return configure(selector, channel, true);
}
static final SelectionKey configure(PyroSelector selector, SocketChannel channel, boolean connect) throws IOException
{
selector.checkThread();
channel.configureBlocking(false);
//channel.socket().setSoLinger(false, 0); // this will b0rk your connections
channel.socket().setSoLinger(true, 4);
channel.socket().setReuseAddress(false);
channel.socket().setKeepAlive(false);
channel.socket().setTcpNoDelay(true);
channel.socket().setReceiveBufferSize(PyroSelector.BUFFER_SIZE);
channel.socket().setSendBufferSize(PyroSelector.BUFFER_SIZE);
int ops = SelectionKey.OP_READ;
if (connect)
ops |= SelectionKey.OP_CONNECT;
return selector.register(channel, ops);
}
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