openfire连接登陆优化方案

client登陆openfire，大概总共须要9个来回才完毕登录。

在2G情况下。就表现为client登录特别慢，所以，为解决问题，对openfire进行了例如以下优化

openfire的连接、登陆过程分为几个步骤，完整报文例如以下。总共分为9个round trip：

===================================================================================================================

1  STREAM

RECV：<stream:stream to="jacklin-pc" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0">

SENT：<?xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" from="jacklin-pc" id="96508a6d" xml:lang="en" version="1.0">

SENT：<stream:features><starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"></starttls><mechanisms xmlns="urn:ietf:p 

arams:xml:ns:xmpp-sasl"><mechanism>DIGEST-MD5</mechanism><mechanism>JIVE-SHAREDSECRET</mechanism><mechanism>PLAIN</mechanism><mechanism>ANONYMOUS</mechanism><mechanism>CRAM-MD5</mechanism></mechanisms><compression xmlns="http://jabber.org/features/compress"><method>zlib</method></compression><auth
xmlns="http://jabber.org/features/iq-auth"/><register xmlns="http://jabber.org/features/iq-register"/></stream:features>

2  TLS

RECV：<starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>

SENT：<proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>

3  STREAM

RECV：<stream:stream to="jacklin-pc" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0">

SENT：<?

xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" from="jacklin-pc" id="96508a6d" xml:lang="en" version="1.0"><stream:features><mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl"><mechanism>DIGEST-MD5</mechanism><mechanism>JIVE-SHAREDSECRET</mechanism><mechanism>PLAIN</mechanism><mechanism>ANONYMOUS</mechanism><mechanism>CRAM-MD5</mechanism></mechanisms><compression xmlns="http://jabber.org/features/compress"><method>zlib</method></compression><auth
xmlns="http://jabber.org/features/iq-auth"/><register xmlns="http://jabber.org/features/iq-register"/></stream:features>

4  SASL

RECV：<auth mechanism="PLAIN" xmlns="urn:ietf:params:xml:ns:xmpp-sasl">cmVhbG09ImphY2tsaW4tcGMiLG5vbmNlPSJMamw2RGt4Y3hGSDZxb2dTRE55Nmw2VkYreVQ2YjROMFlTa1BBSlZqIixxb3A9ImF1dGgiLGNoYXJzZXQ9dXRmLTgsYWxnb3JpdGhtPW1kNS1zZXNz</auth>

SENT：<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl"></success>

5  STREAM

RECV：<stream:stream to="jacklin-pc" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0">

SENT：<?

xml version='1.0' encoding='UTF-8'?><stream:stream xmlns:stream="http://etherx.jabber.org/streams" xmlns="jabber:client" from="jacklin-pc" id="96508a6d" xml:lang="en" version="1.0"><stream:features><compression xmlns="http://jabber.org/features/compress"><method>zlib</method></compression><bind
xmlns="urn:ietf:params:xml:ns:xmpp-bind"/><session xmlns="urn:ietf:params:xml:ns:xmpp-session"/></stream:features>

6  BIND

RECV：<iq id="SfW08-0" type="set"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><resource>Spark 2.6.3</resource></bind></iq>

SENT：<iq type="result" id="SfW08-0" to="jacklin-pc/96508a6d"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>test001@jacklin-pc/Spark 2.6.3</jid></bind></iq>

7  SESSION

RECV：<iq id="SfW08-1" type="set"><session xmlns="urn:ietf:params:xml:ns:xmpp-session"/></iq>

SENT：<iq type="result" id="SfW08-1" to="test001@jacklin-pc/Spark 2.6.3"/>

8  PRESENCE

RECV：<presence id="SfW08-6"><status>在线</status><priority>1</priority></presence>

9  ZLIB

RECV：<compress xmlns='http://jabber.org/protocol/compress'><method>zlib</method></compress>

SENT：<compressed xmlns='http://jabber.org/protocol/compress'/>

===================================================================================================================

1  STREAM优化

当中STREAM类似查询server功能，server会把server的特性返回给client，比如SASL策略，iq-auth，zlib压缩，xmpp-bind等等。事实上，假设是内部定制的系统，这些特性server与client都是共知的，所以不须要查询，全然能够省略这些步骤。

可是，我发现，在client第一次发送stream时，是须要初始化一些内容的。所以，须要再例如以下地方。增加例如以下代码：

org.jivesoftware.openfire.nio.ConnectionHandler

	@Override
	public void sessionOpened(IoSession session) throws Exception {
		// Create a new XML parser for the new connection. The parser will be
		// used by the XMPPDecoder filter.
		final XMLLightweightParser parser = new XMLLightweightParser(CHARSET);
		session.setAttribute(XML_PARSER, parser);
		// Create a new NIOConnection for the new session
		final NIOConnection connection = createNIOConnection(session);
		session.setAttribute(CONNECTION, connection);
		session.setAttribute(HANDLER, createStanzaHandler(connection));
		// Set the max time a connection can be idle before closing it. This
		// amount of seconds
		// is divided in two, as Openfire will ping idle clients first (at 50%
		// of the max idle time)
		// before disconnecting them (at 100% of the max idle time). This
		// prevents Openfire from
		// removing connections without warning.
		final int idleTime = getMaxIdleTime() / 2;
		if (idleTime > 0) {
			session.setIdleTime(IdleStatus.READER_IDLE, idleTime);
		}

		// ADD LOCALSESSION START===========================================================
		Log.info("[DO LOCALSESSION]");
		int hashCode = Thread.currentThread().hashCode();
		XMPPPacketReader parser1 = parsers.get(hashCode);
		if (parser1 == null) {
			parser1 = new XMPPPacketReader();
			parser1.setXPPFactory(factory);
			parsers.put(hashCode, parser1);
		}

		String msg = "<stream:stream to='jacklin-pc' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>";

		StanzaHandler handler = (StanzaHandler) session.getAttribute(HANDLER);
		try {
			handler.process(msg, parser1);
		} catch (Exception e) {
			Log.error(
					"Closing connection due to error while processing message: "
							+ msg, e);
			connection.close();
		}
		// ADD LOCALSESSION END==============================================================

	}

此目的是让server在client建立连接阶段就初始化client的资源。

2  SESSION

session事实上从server端看，仅仅是回复了一下client，并没有起什么作用，所以client能够不发这段报文，server端不须要修改。server端处理步骤例如以下。

org.jivesoftware.openfire.handler.IQSessionEstablishmentHandler

public class IQSessionEstablishmentHandler extends IQHandler {

    private IQHandlerInfo info;

    public IQSessionEstablishmentHandler() {
        super("Session Establishment handler");
        info = new IQHandlerInfo("session", "urn:ietf:params:xml:ns:xmpp-session");
    }

    @Override
	public IQ handleIQ(IQ packet) throws UnauthorizedException {
        // Just answer that the session has been activated
        IQ reply = IQ.createResultIQ(packet);
        return reply;
    }

    @Override
	public IQHandlerInfo getInfo() {
        return info;
    }
}

3  BIND,PRESENCE,ZLIB

事实上PRESENCE和ZLIB能够在clientBIND操作之后。server端直接进行，不须要client再次协商。所以。我在下面代码。进行了下面修改：

org.jivesoftware.openfire.handler.IQBindHandler

@Override
	public IQ handleIQ(IQ packet) throws UnauthorizedException {
		LocalClientSession session = (LocalClientSession) sessionManager
				.getSession(packet.getFrom());
		// If no session was found then answer an error (if possible)
		if (session == null) {
			Log.error("Error during resource binding. Session not found in "
					+ sessionManager.getPreAuthenticatedKeys() + " for key "
					+ packet.getFrom());
			// This error packet will probably won't make it through
			IQ reply = IQ.createResultIQ(packet);
			reply.setChildElement(packet.getChildElement().createCopy());
			reply.setError(PacketError.Condition.internal_server_error);
			return reply;
		}

		IQ reply = IQ.createResultIQ(packet);
		Element child = reply.setChildElement("bind",
				"urn:ietf:params:xml:ns:xmpp-bind");
		// Check if the client specified a desired resource
		String resource = packet.getChildElement().elementTextTrim("resource");
		if (resource == null || resource.length() == 0) {
			// None was defined so use the random generated resource
			resource = session.getAddress().getResource();
		} else {
			// Check that the desired resource is valid
			try {
				resource = JID.resourceprep(resource);
			} catch (StringprepException e) {
				reply.setChildElement(packet.getChildElement().createCopy());
				reply.setError(PacketError.Condition.jid_malformed);
				// Send the error directly since a route does not exist at this
				// point.
				session.process(reply);
				return null;
			}
		}
		// Get the token that was generated during the SASL authentication
		AuthToken authToken = session.getAuthToken();
		if (authToken == null) {
			// User must be authenticated before binding a resource
			reply.setChildElement(packet.getChildElement().createCopy());
			reply.setError(PacketError.Condition.not_authorized);
			// Send the error directly since a route does not exist at this
			// point.
			session.process(reply);
			return reply;
		}
		if (authToken.isAnonymous()) {
			// User used ANONYMOUS SASL so initialize the session as an
			// anonymous login
			session.setAnonymousAuth();
		} else {
			String username = authToken.getUsername().toLowerCase();
			// If a session already exists with the requested JID, then check to
			// see
			// if we should kick it off or refuse the new connection
			ClientSession oldSession = routingTable.getClientRoute(new JID(
					username, serverName, resource, true));
			if (oldSession != null) {
				try {
					int conflictLimit = sessionManager.getConflictKickLimit();
					if (conflictLimit == SessionManager.NEVER_KICK) {
						reply.setChildElement(packet.getChildElement()
								.createCopy());
						reply.setError(PacketError.Condition.conflict);
						// Send the error directly since a route does not exist
						// at this point.
						session.process(reply);
						return null;
					}

					int conflictCount = oldSession.incrementConflictCount();
					if (conflictCount > conflictLimit) {
						// Kick out the old connection that is conflicting with
						// the new one
						StreamError error = new StreamError(
								StreamError.Condition.conflict);
						oldSession.deliverRawText(error.toXML());
						oldSession.close();
					} else {
						reply.setChildElement(packet.getChildElement()
								.createCopy());
						reply.setError(PacketError.Condition.conflict);
						// Send the error directly since a route does not exist
						// at this point.
						session.process(reply);
						return null;
					}
				} catch (Exception e) {
					Log.error("Error during login", e);
				}
			}
			// If the connection was not refused due to conflict, log the user
			// in
			session.setAuthToken(authToken, resource);
		}

		child.addElement("jid").setText(session.getAddress().toString());
		// Send the response directly since a route does not exist at this
		// point.
		session.process(reply);
		// After the client has been informed, inform all listeners as well.
		SessionEventDispatcher.dispatchEvent(session,
				SessionEventDispatcher.EventType.resource_bound);

		// ADD COMPRESSION START==================================================
		 session.getConnection().addCompression();

		 session.getConnection().startCompression();
		 Log.info("[DO COMPRESSION]");
		// ADD COMPRESSION END====================================================

		// ADD PRESENCE START====================================================
		String domain = XMPPServer.getInstance().getServerInfo()
				.getXMPPDomain();
		Presence pp = new Presence();
		pp.setFrom(session.getAddress().toString());
		// pp.setTo(domain);
		XMPPServer.getInstance().getPacketRouter().route(pp);
		Log.info("[DO PRESENCE]:"+ pp.toXML());
		// ADD PRESENCE END====================================================

		return null;
	}

经过以上优化之后，server与client的协商仅仅剩下3个round trip。步骤例如以下：

2  TLS

RECV：<starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>

SENT：<proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls"/>

4  SASL

RECV：<auth mechanism="PLAIN" xmlns="urn:ietf:params:xml:ns:xmpp-sasl">cmVhbG09ImphY2tsaW4tcGMiLG5vbmNlPSJMamw2RGt4Y3hGSDZxb2dTRE55Nmw2VkYreVQ2YjROMFlTa1BBSlZqIixxb3A9ImF1dGgiLGNoYXJzZXQ9dXRmLTgsYWxnb3JpdGhtPW1kNS1zZXNz</auth>

SENT：<success xmlns="urn:ietf:params:xml:ns:xmpp-sasl"></success>

6  BIND

RECV：<iq id="SfW08-0" type="set"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><resource>Spark 2.6.3</resource></bind></iq>

SENT：<iq type="result" id="SfW08-0" to="jacklin-pc/96508a6d"><bind xmlns="urn:ietf:params:xml:ns:xmpp-bind"><jid>test001@jacklin-pc/Spark 2.6.3</jid></bind></iq>

client依照例如以下节奏发送报文。并进行操作就能够了。client改动代码。在这里不做描写叙述，请改动者自行尝试