mongodb连接超时后套接字io停止工作

Question

我有一个用reactjs，nodejs和expressjs，mongodb和socket io创建的聊天应用程序。一切运行良好，但是当我遇到短暂的互联网连接问题时，后端引发了此错误：

{ MongoError: connection 4 to (database_url:port) timed out
    at Function.MongoError.create (/repo_directory/node_modules/mongodb-core/lib/error.js:29:11)
    at TLSSocket.<anonymous> (/repo_directory/node_modules/mongodb-core/lib/connection/connection.js:186:20)
    at Object.onceWrapper (events.js:313:30)
    at emitNone (events.js:106:13)
    at TLSSocket.emit (events.js:208:7)
    at TLSSocket.Socket._onTimeout (net.js:422:8)
    at ontimeout (timers.js:498:11)
    at tryOnTimeout (timers.js:323:5)
    at Timer.listOnTimeout (timers.js:290:5)
  name: 'MongoError',
  message: 'connection 4 to (database_url:port) timed out' }
Error: Mubsub: broken cursor.
    at Timeout._onTimeout (/repo_directory/node_modules/mubsub/lib/channel.js:159:40)
    at ontimeout (timers.js:498:11)
    at tryOnTimeout (timers.js:323:5)
    at Timer.listOnTimeout (timers.js:290:5)

然后，即使互联网连接恢复，套接字io也将停止工作。需要重新启动nodejs才能使一切再次正常运行。 现在，是否有一种方法可以仅重新启动套接字io以使其再次正常工作？因此，我不必重新启动整个服务器即可解决此问题。

下面是我的代码：

var server = http.createServer(app);
var io = app.io;
io.attach(server, {
  handlePreflightRequest: function (req, res) {
    let origin = req.headers['origin']
    console.log('handling socket cors..', origin)
    var headers = {
      'Access-Control-Allow-Headers': 'Content-Type, Authorization, channel, conversationid, conversationsecret, customerid, merchantid',
      'Access-Control-Allow-Origin': origin,
      'Access-Control-Allow-Credentials': true
    };
    res.writeHead(200, headers);
    res.end();
  }
});

。

var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function () {
    // we're connected!
    console.log("Connected correctly to server", moment().format('LLL'));
  });

// circular reference for io to be easily passed
var app = express();

var io = socket_io();
app.io = io;
io.on('connection', function(socket) {
  // the primary socket at '/' 
  console.log('user ' + socket.id + ' has connected on /');
});
var setupIO = require('./chat/sockets/socketioManager')(io);

app.set('socketio', setupIO);

socketioManager文件（编辑了一些信息）：

module.exports = function(io) {

    var ioManager = io;
    let mubsubClient = mubsub(config.mongoUrl)
    var adapter = mongoAdapter(config.mongoUrl, {
        key: 'key',
        client: mubsubClient
    });

    adapter.channel = mubsubClient.channels['key']

    ioManager.adapter(adapter);
    mubsubClient.on('error', console.error);
    adapter.channel.on('error', console.error);


    ioManager.on('error', function (err) { 
       console.log(err.stack);
    });

    ioManager.on('connection', function(socket) {

        console.log( 'connection attempt', socket.customerId, socket.conversationId )

        var subscription;
        var request = socket.request
        var adminSubscription = null;
        if ( socket.type === 'spectator' ) {
            subscription = SpectatorSubscriber( socket.merchantId, socket, adapter )
        } else {
            console.log( 'subscribing to', socket.customerId, socket.merchantId )
            subscription = CustomerSubscriber( socket.customerId, socket.merchantId, socket, adapter )
        }

        // pre load conversations
        if ( socket.customerId ) {
            getMessageList( socket.customerId, 0, 20, ( err, messages ) => {
                if(err) console.log(err);
                else socket.emit('msglist', messages);
            } )
        }  

        console.log('[socket] connection from', socket.channel)

        socket.on( 'sendInvite', inviteHandler( ioManager ) )

        socket.on( 'sendMsg', sendMessageHandler( ioManager, socket ) )

        socket.on( 'sendBlock', sendBlock(ioManager))

        socket.on( 'getMsgsWithSkip', function( req, callback ) {
            var skipnum = req.skipnum;
            getMessageList( socket.customerId, skipnum, 20, ( err , messages ) => {
                console.log( 'GETTING PREV MESSAGES', messages.length )
                if ( err ) console.log( err )
                else callback( messages )
            } )
        })

        socket.on('disconnect', function() {
            if ( subscription != null ) subscription.unsubscribe()
            if ( adminSubscription != null ) adminSubscription.unsubscribe()
        });
    });

    return ioManager;
}