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package com.juick.server.xmpp.router;
import com.juick.server.XMPPServer;
import com.juick.server.xmpp.s2s.BasicXmppSession;
import com.juick.server.xmpp.s2s.CacheEntry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.xmlpull.v1.XmlPullParserException;
import rocks.xmpp.addr.Jid;
import rocks.xmpp.core.stanza.model.IQ;
import rocks.xmpp.core.stanza.model.Message;
import rocks.xmpp.core.stanza.model.Presence;
import rocks.xmpp.core.stanza.model.Stanza;
import rocks.xmpp.core.stanza.model.server.ServerIQ;
import rocks.xmpp.core.stanza.model.server.ServerMessage;
import rocks.xmpp.core.stanza.model.server.ServerPresence;
import rocks.xmpp.util.XmppUtils;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutorService;
@Component
public class XMPPRouter implements StreamHandler {
private static final Logger logger = LoggerFactory.getLogger(XMPPRouter.class);
@Inject
private ExecutorService service;
private final List<StreamComponentServer> connections = Collections.synchronizedList(new ArrayList<>());
private final List<CacheEntry> outCache = new CopyOnWriteArrayList<>();
private ServerSocket listener;
@Inject
private BasicXmppSession session;
@Value("${router_port:5347}")
private int routerPort;
@Inject
private XMPPServer xmppServer;
@PostConstruct
public void init() {
logger.info("component router initialized");
service.submit(() -> {
try {
listener = new ServerSocket(routerPort);
logger.info("component router listening on {}", routerPort);
while (!listener.isClosed()) {
if (Thread.currentThread().isInterrupted()) break;
Socket socket = listener.accept();
service.submit(() -> {
try {
StreamComponentServer client = new StreamComponentServer(socket.getInputStream(), socket.getOutputStream(), "secret");
addConnectionIn(client);
client.setHandler(this);
client.connect();
} catch (IOException e) {
logger.error("component error", e);
} catch (XmlPullParserException e) {
e.printStackTrace();
}
});
}
} catch (SocketException e) {
// shutdown
} catch (IOException e) {
logger.warn("io exception", e);
}
});
}
@PreDestroy
public void close() throws Exception {
if (!listener.isClosed()) {
listener.close();
}
synchronized (getConnections()) {
for (Iterator<StreamComponentServer> i = getConnections().iterator(); i.hasNext(); ) {
StreamComponentServer c = i.next();
c.logoff();
i.remove();
}
}
service.shutdown();
logger.info("XMPP router destroyed");
}
private void addConnectionIn(StreamComponentServer c) {
synchronized (getConnections()) {
getConnections().add(c);
}
}
private void sendOut(Stanza s) {
try {
StringWriter stanzaWriter = new StringWriter();
XMLStreamWriter xmppStreamWriter = XmppUtils.createXmppStreamWriter(
session.getConfiguration().getXmlOutputFactory().createXMLStreamWriter(stanzaWriter));
session.createMarshaller().marshal(s, xmppStreamWriter);
xmppStreamWriter.flush();
xmppStreamWriter.close();
String xml = stanzaWriter.toString();
logger.info("XMPPRouter (out): {}", xml);
sendOut(s.getTo().getDomain(), xml);
} catch (XMLStreamException | JAXBException e1) {
logger.info("jaxb exception", e1);
}
}
private void sendOut(String hostname, String xml) {
boolean haveAnyConn = false;
StreamComponentServer connOut = null;
synchronized (getConnections()) {
for (StreamComponentServer c : getConnections()) {
if (c.to != null && c.to.getDomain().equals(hostname)) {
if (c.isLoggedIn()) {
connOut = c;
break;
} else {
logger.info("bouncing stanza to {} component until it will be ready", hostname);
boolean haveCache = false;
for (CacheEntry entry : outCache) {
if (entry.hostname != null && entry.hostname.equals(hostname)) {
entry.xml += xml;
entry.updated = Instant.now();
haveCache = true;
break;
}
}
if (!haveCache) {
outCache.add(new CacheEntry(Jid.of(hostname), xml));
}
}
}
}
}
if (connOut != null) {
connOut.send(xml);
return;
}
xmppServer.sendOut(Jid.of(hostname), xml);
}
public List<StreamComponentServer> getConnections() {
return connections;
}
private Stanza parse(String xml) {
try {
Unmarshaller unmarshaller = session.createUnmarshaller();
return (Stanza)unmarshaller.unmarshal(new StringReader(xml));
} catch (JAXBException e) {
logger.error("JAXB exception", e);
}
return null;
}
@Override
public void stanzaReceived(String stanza) {
Stanza input = parse(stanza);
if (input instanceof Message) {
sendOut(ServerMessage.from((Message)input));
} else if (input instanceof IQ) {
sendOut(ServerIQ.from((IQ)input));
} else {
sendOut(ServerPresence.from((Presence) input));
}
}
public String getFromCache(Jid to) {
final String[] cache = new String[1];
outCache.stream().filter(c -> c.hostname != null && c.hostname.equals(to)).findFirst().ifPresent(c -> {
cache[0] = c.xml;
outCache.remove(c);
});
return cache[0];
}
@Override
public void ready(StreamComponentServer componentServer) {
logger.info("component {} ready", componentServer.to);
String cache = getFromCache(componentServer.to);
if (cache != null) {
logger.debug("sending cache to {}", componentServer.to);
componentServer.send(cache);
}
}
@Override
public void fail(Exception e) {
}
@Override
public boolean filter(Jid jid, Jid jid1) {
return false;
}
}
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