SIP servlet，chatserver

时间：2010-05-28 08:35:20

标签： java servlets sip

我正在努力让SIP servlet聊天服务器工作，together with the textclient found here。

当我使用2个客户端向对方发送消息（点对点）时，一切顺利。但是当我将一个或多个客户端与我的服务器一起使用时，我必须等待32秒，然后服务器才能在doMessage()方法中获取任何新消息。 我正在使用Netbeans和Sailfin作为我的SIP服务器。我正在调查Sailfin中的请求或响应之间是否存在某种限制或可配置的延迟或超时？

如果需要，我可以发布服务器代码。

由于

3 个答案:

答案 0 :(得分：2)

这是服务器的代码，我稍后会尝试进行wireshark跟踪。

public class ChatroomSipServlet extends SipServlet {

    public final static String USER_LIST = "userList";

    public final static String CHATROOM_SERVER_NAME = "chatroomservername";

    public String serverAddress;
    public SipFactory factory;

    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        super.init(servletConfig);
        System.out.println("Chatroom sip servlet is gestart!");
        try {
            factory = (SipFactory) getServletContext().getAttribute("javax.servlet.sip.SipFactory");
            System.out.println("Sip Factory: " + factory);
        } catch (Exception e) {
            throw new ServletException("Factory probleem!", e);
        }
        getServletContext().setAttribute(USER_LIST, new ArrayList<String>());
        serverAddress = getServletConfig().getInitParameter(CHATROOM_SERVER_NAME);
        System.out.println("serverAddress is: " + serverAddress);
    }

    @Override
    public void destroy() {
        try {
            sendToAll(serverAddress, "Server sluit af!");
        } catch (Throwable e) {

            e.printStackTrace();
        }
        super.destroy();
    }

    protected void doMessage(SipServletRequest request) throws ServletException, IOException {

        System.out.println(getDateTime() + " Bericht ontvangen");

        request.createResponse(SipServletResponse.SC_OK).send();

        String message = request.getContent().toString();
        String from = ((SipURI) request.getFrom().getURI()).toString();

        if (message.equalsIgnoreCase("/quit")) {
            sendToUser(from, "Bye");
            removeUser(from);
            return;
        }

        if (!containsUser(from)) {
            sendToUser(from, "Welkom in de chatroom. Typ '/quit' om af te sluiten.");
            addUser(from);
        }

        if (message.equalsIgnoreCase("/who")) {
            String users = "Lijst van de gebruikers:\n";
            List<String> list = (List<String>) getServletContext().getAttribute(USER_LIST);
            for (String user : list) {
                users += user + "\n";
            }
            sendToUser(from, users);
            return;
        }

        if (message.equalsIgnoreCase("/join")) {
            return;
        }

        sendToAll(from, message);
    }

    protected void doErrorResponse(SipServletResponse response) throws ServletException, IOException {

//      String receiver = response.getTo().toString();
        String receiver = ((SipURI) response.getTo().getURI()).toString();
        System.out.println(getDateTime() + " Errorresponse voor " + receiver);
        removeUser(receiver);
    }

    protected void doSuccessResponse(SipServletResponse response) throws ServletException, IOException {

        response.getApplicationSession().invalidate();
    }

    private void sendToAll(String from, String message) throws ServletParseException, IOException {

        List<String> list = (List<String>) getServletContext().getAttribute(USER_LIST);
        for (String user : list) {
            SipApplicationSession session = factory.createApplicationSession();
            System.out.println(getDateTime() + " Session created voor " + user);
            SipServletRequest request = factory.createRequest(session, "MESSAGE", serverAddress, user);
            String msg = from + " stuurt: \n" + message;
            request.setContent(msg.getBytes(), "text/plain");
            request.send();
        }
    }

    private void sendToUser(String to, String message) throws ServletParseException, IOException {

        SipApplicationSession session = factory.createApplicationSession();
        SipServletRequest request = factory.createRequest(session, "MESSAGE", serverAddress, to);
        request.setContent(message.getBytes(), "text/plain");
        request.send();
    }

    private boolean containsUser(String from) {
        List<String> list = (List<String>) getServletContext().getAttribute(USER_LIST);
        return list.contains(from);
    }

    private void addUser(String from) {
        List<String> list = (List<String>) getServletContext().getAttribute(USER_LIST);
        list.add(from);
    }

    private void removeUser(String from) {
        System.out.println(getDateTime() + " " + from + " wordt verwijderd uit de lijst.");
        List<String> list = (List<String>) getServletContext().getAttribute(USER_LIST);
        list.remove(from);

    }

    @Override
    protected void doRegister(SipServletRequest req) throws ServletException, IOException {
        System.out.println("Register request ontvangen: " + req.getTo());
        int response = SipServletResponse.SC_OK;
        SipServletResponse resp = req.createResponse(response);
        resp.send();
    }

    private String getDateTime() {
        DateFormat dateFormat = new SimpleDateFormat("[" + "HH:mm:ss" + "]");
        Date date = new Date();
        return dateFormat.format(date);
    }
}

和sip.xml 

<sip-app>
    <app-name>sip.chatvoorbeeld.ChatServer</app-name>
    <display-name>Chatroom Sip Servlet</display-name>
    <description>Chatroom Sip Servlet</description>

    <servlet-selection>
        <main-servlet>
            ChatroomSipServlet
        </main-servlet>
    </servlet-selection>
    <session-config>
        <session-timeout>5</session-timeout>
    </session-config>

    <servlet>
        <servlet-name>ChatroomSipServlet</servlet-name>
        <display-name>ChatroomSipServlet</display-name>
        <description>Chatroom SIP servlet</description>
        <servlet-class>
            sip.chatvoorbeeld.ChatroomSipServlet
        </servlet-class>
        <init-param>
            <param-name>chatroomservername</param-name>
            <param-value>sip:chatserver@192.168.56.1:5060</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
</sip-app>

我还尝试了一个空的servlet，只用一个doMessage()方法打印出“收到的消息”。同样的32秒延迟...

Wireshark给了我：

我将消息“test”发送到服务器：

MESSAGE sip:chatserver@192.168.56.1:5060;transport=udp SIP/2.0
Call-ID: aba00c2646a9b4e6df3b15df19dbf58d@192.168.56.101
CSeq: 1 MESSAGE
From: "bobby" <sip:bobby@192.168.56.101:5095>;tag=textclientv1.0
To: "chatserver" <sip:chatserver@192.168.56.1:5060>
Via: SIP/2.0/UDP 192.168.56.101:5095;branch=branch1
Max-Forwards: 70
Contact: "bobby" <sip:bobby@192.168.56.101:5095>
Content-Type: text/plain
Content-Length: 4

test

服务器发回：

SIP/2.0 200 OK
Content-Length: 0
To: "chatserver"<sip:chatserver@192.168.56.1:5060>;tag=g9vdns7u-e
Cseq: 1 MESSAGE
Via: SIP/2.0/UDP 192.168.56.101:5095;branch=branch1
From: "bobby"<sip:bobby@192.168.56.101:5095>;tag=textclientv1.0
Call-Id: aba00c2646a9b4e6df3b15df19dbf58d@192.168.56.101
Server: Glassfish_SIP_2.0.0

MESSAGE sip:bobby@192.168.56.101:5095 SIP/2.0
Max-Forwards: 69
Content-Length: 43
To: <sip:bobby@192.168.56.101:5095>
Cseq: 1 MESSAGE
Via: SIP/2.0/UDP 192.168.56.1:5060;branch=z9hG4bKdaacb7673c871796474ca951221a6643db6c
Content-Type: text/plain
Call-Id: 192.168.56.1_11_6595680936174578736
From: <sip:chatserver@192.168.56.1:5060>;tag=g9vdns7u-g

sip:bobby@192.168.56.101:5095 stuurt: 
test

然后我的客户再次回答：

SIP/2.0 200 OK
To: <sip:bobby@192.168.56.101:5095>;tag=888
CSeq: 1 MESSAGE
Via: SIP/2.0/UDP 192.168.56.1:5060;branch=z9hG4bKdaacb7673c871796474ca951221a6643db6c;received=192.168.56.1
Call-ID: 192.168.56.1_11_6595680936174578736
From: <sip:chatserver@192.168.56.1:5060>;tag=g9vdns7u-g
Content-Length: 0

到目前为止一切顺利，一切顺利。 但现在我向服务器“test2”发送第二条消息，我得到了这个：

客户端到服务器：

MESSAGE sip:chatserver@192.168.56.1:5060;transport=udp SIP/2.0
Call-ID: 95ad65365378b9b6b5bd7ad3629f7b02@192.168.56.101
CSeq: 1 MESSAGE
From: "bobby" <sip:bobby@192.168.56.101:5095>;tag=textclientv1.0
To: "chatserver" <sip:chatserver@192.168.56.1:5060>
Via: SIP/2.0/UDP 192.168.56.101:5095;branch=branch1
Max-Forwards: 70
Contact: "bobby" <sip:bobby@192.168.56.101:5095>
Content-Type: text/plain
Content-Length: 5

test2

然后服务器确实响应：

SIP/2.0 200 OK
Content-Length: 0
To: "chatserver"<sip:chatserver@192.168.56.1:5060>;tag=g9vdns7u-e
Cseq: 1 MESSAGE
Via: SIP/2.0/UDP 192.168.56.101:5095;branch=branch1
From: "bobby"<sip:bobby@192.168.56.101:5095>;tag=textclientv1.0
Call-Id: aba00c2646a9b4e6df3b15df19dbf58d@192.168.56.101
Server: Glassfish_SIP_2.0.0

然后通讯停止了......我得到了200 OK，但我的println()方法中的doMessage()未通过。

答案 1 :(得分：1)

32秒是事务的正常超时（在RFC3261中表示为64 * T1，其中T1的默认值为500ms。）

我没有直接想法解决您的问题，除了超时很可能不是SailFin中的错误配置。所以请提供wireshark跟踪和服务器代码！

答案 2 :(得分：0)

要回答我自己的问题，如果有人遇到同样的问题，我发现这是textclient中的一个错误，违反了RFC 3261的8.1.1.7节。

  

分支参数值必须是   所有人都有独特的空间和时间   UA发送的请求。该   这条规则的例外是CANCEL和   确认非2xx响应。如   下面讨论一个CANCEL请求   具有相同的分支值   参数作为取消的请求。   如第17.1.1.3节所述，   对于非2xx响应的ACK也将   具有与INVITE相同的分支ID   它承认的回应。

     

分支的唯一性属性   ID参数，方便其使用   事务ID，不是RFC的一部分   2543。

     

元素插入的分支ID   符合此规范必须   总是以角色开头   “z9hG4bK”。

SipLayer.java中的以下行

ViaHeader viaHeader = headerFactory.createViaHeader(getHost(),
getPort(), "udp", "branch1");

将使用“branch1”参数创建每条消息。使此参数唯一可以解决问题。

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