处理可能会出现的空指针异常

pei

2024-03-29 728e60ce8431fe5a70e44a1da2d4835425ce83a5

 src/main/java/com/genersoft/iot/vmp/gb28181/SipLayer.java

@@ -1,262 +1,141 @@
package com.genersoft.iot.vmp.gb28181;

import java.text.ParseException;
import java.util.Properties;

import javax.annotation.PostConstruct;
import javax.sip.DialogTerminatedEvent;
import javax.sip.IOExceptionEvent;
import javax.sip.ListeningPoint;
import javax.sip.RequestEvent;
import javax.sip.ResponseEvent;
import javax.sip.ServerTransaction;
import javax.sip.SipFactory;
import javax.sip.SipListener;
import javax.sip.SipProvider;
import javax.sip.SipStack;
import javax.sip.TimeoutEvent;
import javax.sip.TransactionAlreadyExistsException;
import javax.sip.TransactionTerminatedEvent;
import javax.sip.TransactionUnavailableException;
import javax.sip.address.AddressFactory;
import javax.sip.header.HeaderFactory;
import javax.sip.header.ViaHeader;
import javax.sip.message.MessageFactory;
import javax.sip.message.Request;
import javax.sip.message.Response;

import com.genersoft.iot.vmp.conf.SipConfig;
import com.genersoft.iot.vmp.conf.UserSetting;
import com.genersoft.iot.vmp.gb28181.bean.GbStringMsgParserFactory;
import com.genersoft.iot.vmp.gb28181.conf.DefaultProperties;
import com.genersoft.iot.vmp.gb28181.transmit.ISIPProcessorObserver;
import gov.nist.javax.sip.SipProviderImpl;
import gov.nist.javax.sip.SipStackImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.util.ObjectUtils;

import com.genersoft.iot.vmp.conf.SipConfig;
import com.genersoft.iot.vmp.gb28181.transmit.SIPProcessorFactory;
import com.genersoft.iot.vmp.gb28181.transmit.request.ISIPRequestProcessor;
import com.genersoft.iot.vmp.gb28181.transmit.response.ISIPResponseProcessor;

import gov.nist.javax.sip.SipStackImpl;
import javax.sip.*;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

@Component
public class SipLayer implements SipListener, Runnable {
@Order(value=10)
public class SipLayer implements CommandLineRunner {

   private final static Logger logger = LoggerFactory.getLogger(SipLayer.class);

   @Autowired
   private SipConfig sipConfig;

   private SipProvider tcpSipProvider;

   private SipProvider udpSipProvider;
   @Autowired
   private ISIPProcessorObserver sipProcessorObserver;

   @Autowired
   private SIPProcessorFactory processorFactory;
   private UserSetting userSetting;

   private SipStack sipStack;

   private AddressFactory addressFactory;
   private HeaderFactory headerFactory;
   private MessageFactory messageFactory;

   @PostConstruct
   private void initSipServer() {
      Thread thread = new Thread(this);
      thread.setDaemon(true);
      thread.setName("sip server thread start");
      thread.start();
   }
   private final Map<String, SipProviderImpl> tcpSipProviderMap = new ConcurrentHashMap<>();
   private final Map<String, SipProviderImpl> udpSipProviderMap = new ConcurrentHashMap<>();

   @Override
   public void run() {
      SipFactory sipFactory = SipFactory.getInstance();
      sipFactory.setPathName("gov.nist");
   public void run(String... args) {
      List<String> monitorIps = new ArrayList<>();
      // 使用逗号分割多个ip
      String separator = ",";
      if (sipConfig.getIp().indexOf(separator) > 0) {
         String[] split = sipConfig.getIp().split(separator);
         monitorIps.addAll(Arrays.asList(split));
      }else {
         monitorIps.add(sipConfig.getIp());
      }

      SipFactory.getInstance().setPathName("gov.nist");
      if (monitorIps.size() > 0) {
         for (String monitorIp : monitorIps) {
            addListeningPoint(monitorIp, sipConfig.getPort());
         }
         if (udpSipProviderMap.size() + tcpSipProviderMap.size() == 0) {
            System.exit(1);
         }
      }
   }

   private void addListeningPoint(String monitorIp, int port){
      SipStackImpl sipStack;
      try {
         headerFactory = sipFactory.createHeaderFactory();

         addressFactory = sipFactory.createAddressFactory();
         messageFactory = sipFactory.createMessageFactory();

         Properties properties = new Properties();
         properties.setProperty("javax.sip.STACK_NAME", "GB28181_SIP");
         properties.setProperty("javax.sip.IP_ADDRESS", sipConfig.getSipIp());
         properties.setProperty("gov.nist.javax.sip.LOG_MESSAGE_CONTENT", "false");
         /**
          * sip_server_log.log 和 sip_debug_log.log public static final int TRACE_NONE =
          * 0; public static final int TRACE_MESSAGES = 16; public static final int
          * TRACE_EXCEPTION = 17; public static final int TRACE_DEBUG = 32;
          */
         properties.setProperty("gov.nist.javax.sip.TRACE_LEVEL", "32");
         properties.setProperty("gov.nist.javax.sip.SERVER_LOG", "sip_server_log");
         properties.setProperty("gov.nist.javax.sip.DEBUG_LOG", "sip_debug_log");
         sipStack = (SipStackImpl) sipFactory.createSipStack(properties);

         startTcpListener();
         startUdpListener();
      } catch (Exception e) {
         logger.error("Sip Server 启动失败！ port {" + sipConfig.getSipPort() + "}");
         e.printStackTrace();
      }
      logger.info("Sip Server 启动成功 port {" + sipConfig.getSipPort() + "}");
   }

   private void startTcpListener() throws Exception {
      ListeningPoint tcpListeningPoint = sipStack.createListeningPoint(sipConfig.getSipIp(), sipConfig.getSipPort(),
            "TCP");
      tcpSipProvider = sipStack.createSipProvider(tcpListeningPoint);
      tcpSipProvider.addSipListener(this);
   }

   private void startUdpListener() throws Exception {
      ListeningPoint udpListeningPoint = sipStack.createListeningPoint(sipConfig.getSipIp(), sipConfig.getSipPort(),
            "UDP");
      udpSipProvider = sipStack.createSipProvider(udpListeningPoint);
      udpSipProvider.addSipListener(this);
   }

   /**
    * SIP服务端接收消息的方法 Content 里面是GBK编码 This method is called by the SIP stack when a
    * new request arrives.
    */
   @Override
   public void processRequest(RequestEvent evt) {
      ISIPRequestProcessor processor = processorFactory.createRequestProcessor(evt);
      processor.process(evt, this);
   }

   @Override
   public void processResponse(ResponseEvent evt) {
      Response response = evt.getResponse();
      int status = response.getStatusCode();
      if ((status >= 200) && (status < 300)) { // Success!
         ISIPResponseProcessor processor = processorFactory.createResponseProcessor(evt);
         try {
            processor.process(evt, this, sipConfig);
         } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }
      // } else if (status == Response.TRYING) {
         // trying不会回复
      } else if ((status >= 100) && (status < 200)) {
         // 增加其它无需回复的响应，如101、180等
      } else {
         logger.warn("接收到失败的response响应！status：" + status + ",message:" + response.getReasonPhrase()/* .getContent().toString()*/);
      }
      // trying不会回复
      // if (status == Response.TRYING) {

      // }
   }

   /**
    * <p>
    * Title: processTimeout
    * </p>
    * <p>
    * Description:
    * </p>
    * 
    * @param timeoutEvent
    */
   @Override
   public void processTimeout(TimeoutEvent timeoutEvent) {
      // TODO Auto-generated method stub

   }

   /**
    * <p>
    * Title: processIOException
    * </p>
    * <p>
    * Description:
    * </p>
    * 
    * @param exceptionEvent
    */
   @Override
   public void processIOException(IOExceptionEvent exceptionEvent) {
      // TODO Auto-generated method stub

   }

   /**
    * <p>
    * Title: processTransactionTerminated
    * </p>
    * <p>
    * Description:
    * </p>
    * 
    * @param transactionTerminatedEvent
    */
   @Override
   public void processTransactionTerminated(TransactionTerminatedEvent transactionTerminatedEvent) {
      // TODO Auto-generated method stub

   }

   /**
    * <p>
    * Title: processDialogTerminated
    * </p>
    * <p>
    * Description:
    * </p>
    * 
    * @param dialogTerminatedEvent
    */
   @Override
   public void processDialogTerminated(DialogTerminatedEvent dialogTerminatedEvent) {
      // TODO Auto-generated method stub

   }

   public ServerTransaction getServerTransaction(RequestEvent evt) {
      Request request = evt.getRequest();
      ServerTransaction serverTransaction = evt.getServerTransaction();
      // 判断TCP还是UDP
      boolean isTcp = false;
      ViaHeader reqViaHeader = (ViaHeader) request.getHeader(ViaHeader.NAME);
      String transport = reqViaHeader.getTransport();
      if (transport.equals("TCP")) {
         isTcp = true;
         sipStack = (SipStackImpl)SipFactory.getInstance().createSipStack(DefaultProperties.getProperties("GB28181_SIP", userSetting.getSipLog()));
         sipStack.setMessageParserFactory(new GbStringMsgParserFactory());
      } catch (PeerUnavailableException e) {
         logger.error("[SIP SERVER] SIP服务启动失败， 监听地址{}失败,请检查ip是否正确", monitorIp);
         return;
      }

      if (serverTransaction == null) {
         try {
            if (isTcp) {
               serverTransaction = tcpSipProvider.getNewServerTransaction(request);
            } else {
               serverTransaction = udpSipProvider.getNewServerTransaction(request);
            }
         } catch (TransactionAlreadyExistsException e) {
            e.printStackTrace();
         } catch (TransactionUnavailableException e) {
            e.printStackTrace();
         }
      try {
         ListeningPoint tcpListeningPoint = sipStack.createListeningPoint(monitorIp, port, "TCP");
         SipProviderImpl tcpSipProvider = (SipProviderImpl)sipStack.createSipProvider(tcpListeningPoint);

         tcpSipProvider.setDialogErrorsAutomaticallyHandled();
         tcpSipProvider.addSipListener(sipProcessorObserver);
         tcpSipProviderMap.put(monitorIp, tcpSipProvider);
         logger.info("[SIP SERVER] tcp://{}:{} 启动成功", monitorIp, port);
      } catch (TransportNotSupportedException
             | TooManyListenersException
             | ObjectInUseException
             | InvalidArgumentException e) {
         logger.error("[SIP SERVER] tcp://{}:{} SIP服务启动失败,请检查端口是否被占用或者ip是否正确"
               , monitorIp, port);
      }
      return serverTransaction;

      try {
         ListeningPoint udpListeningPoint = sipStack.createListeningPoint(monitorIp, port, "UDP");

         SipProviderImpl udpSipProvider = (SipProviderImpl)sipStack.createSipProvider(udpListeningPoint);
         udpSipProvider.addSipListener(sipProcessorObserver);

         udpSipProviderMap.put(monitorIp, udpSipProvider);

         logger.info("[SIP SERVER] udp://{}:{} 启动成功", monitorIp, port);
      } catch (TransportNotSupportedException
             | TooManyListenersException
             | ObjectInUseException
             | InvalidArgumentException e) {
         logger.error("[SIP SERVER] udp://{}:{} SIP服务启动失败,请检查端口是否被占用或者ip是否正确"
               , monitorIp, port);
      }
   }

   public AddressFactory getAddressFactory() {
      return addressFactory;
   public SipProviderImpl getUdpSipProvider(String ip) {
      if (ObjectUtils.isEmpty(ip)) {
         return null;
      }
      return udpSipProviderMap.get(ip);
   }

   public HeaderFactory getHeaderFactory() {
      return headerFactory;
   public SipProviderImpl getUdpSipProvider() {
      if (udpSipProviderMap.size() != 1) {
         return null;
      }
      return udpSipProviderMap.values().stream().findFirst().get();
   }

   public MessageFactory getMessageFactory() {
      return messageFactory;
   public SipProviderImpl getTcpSipProvider() {
      if (tcpSipProviderMap.size() != 1) {
         return null;
      }
      return tcpSipProviderMap.values().stream().findFirst().get();
   }

   public SipProvider getTcpSipProvider() {
      return tcpSipProvider;
   public SipProviderImpl getTcpSipProvider(String ip) {
      if (ObjectUtils.isEmpty(ip)) {
         return null;
      }
      return tcpSipProviderMap.get(ip);
   }

   public SipProvider getUdpSipProvider() {
      return udpSipProvider;
   public String getLocalIp(String deviceLocalIp) {
      if (!ObjectUtils.isEmpty(deviceLocalIp)) {
         return deviceLocalIp;
      }
      return getUdpSipProvider().getListeningPoint().getIPAddress();
   }

}