javascript - 将数据从 socket.io 中间件传递到事件的正确方法

Question

我想从 socket.io middleware 传递一些数据到发出的event .我正在从请求中提供的 header token 中提取一些详细信息，并将提取的数据附加到 socket像这样的对象:

/* extracting details from token, before connecting */
io.use((socket, next) => {
    const details = fetchDetails(socket.request.headers.token);
    // appending details to socket object
    socket.details = details;
    next();
});

/* on connection event */
io.on("connection", (socket) => {
    console.log('Client conected');
    // accessing details fetched in the middleware
    console.log(socket.details);
});

一切正常，我唯一关心的是这种方法是否万无一失？是否保证 middleware 中附加的数据将始终在 event 中访问，或者是否存在我的附加数据将在事件中被覆盖/丢失的情况？
从 middleware 传递数据是否正确？到发出的 event ?

Answer 1

像这样的东西应该可以编辑:即使使用 typescript 也可以正常工作

    /* extracting details from token, before connecting */
    io.use((socket, next) => {
        const details = fetchDetails(socket.request.headers.token);
        // use socket.data to pass additional attachments
        socket.data = details;
        next();
    });

    /* on connection event */
    io.on("connection", (socket) => {
        console.log('Client conected');
        // accessing details fetched in the middleware from socket.data object
        console.log(socket.data);
        
        //If you want to pass another object in emit() from frontend
        socket.on("some_action", (anotherData) => {
          //Here's your data from event
          console.log(anotherData);
          
          //And here's your data from middleware
          console.log(socket.data);
        })
    });