Question

dbOperations.saveRequest(db, requestId, requestTime, location, eventData.citizenId, 'waiting', function(results) {

        //2. AFTER saving, fetch nearby cops from citizen’s location
        dbOperations.fetchNearestCops(db, location.coordinates, function(results) {
            eventData.requestId = requestId;
            //3. After fetching nearest cops, fire a 'request-for-help' event to each of them
            for (var i = 0; i < results.length; i++) {
                io.sockets.in(results[i].userId).emit('request-for-help', eventData);
            }
        });
    });
});

我想将活动发送给特定的警察但不是全部......... 我并没有完全了解io.socket.in如何工作可以任何人建议我aproper参考继续plzzzzzzz ............

Answer 1

基本上我们在项目中所做的是创建了一个层，用于管理userId和socketId之间的一对一映射。因此，每当连接用户套接字时，我们首先注册该用户，因此该层添加userId到socketId的映射，当用户断开连接时，我们删除了基于socketId的映射。

因此，如果要发送给用户，请将此userId传递给此图层，如果映射到socketId将发送此图层。

<强>伪代码

var userMap ={};
var socketMap ={};

io.sockets.on('connection', function(socket) {

   socket.on('register', function(userId, cb) {
      /*Our custom event, which on basis of userId add mapping between user and socketid*/ 
      userMap[userId] = socket.id;          //save user
      socketMap[socket.id] = userId;        //save socket
   });

   socket.on('disconnect', function(userId, cb) {
     /*When socket disconnect, remove mapping*/ 
      delete userMap[socketMap[socket.id]];         //remove user
      delete socketMap[socket.id];                  //remove socket
   });

});

/*Function used to send message*/
function sendMessage(userId){
    if(userMap[userId]){
          io.to(userMap[userId]).emit('message');
    }       
}

如何在命名空间socket.io中连接客户端与其他客户端？

1 个答案: