redis服务器脱机使节点崩溃

redis-server offline crashes node

本文关键字：节点 崩溃 脱机 服务器 redis      更新时间：2023-09-26

我在这里玩得很开心。我读了太多关于同一主题的文件和其他人的问题，却找不到如何阻止这种情况发生的答案。我有意关闭redis服务器，以确保应用程序在生产过程中不会完全成为核应用程序，但我所做的一切似乎都无法阻止这种情况的发生。下面是一个非常简单的例子，说明我的代码现在是什么。。。

var cluster = require('cluster');
var express = require('express');
var http = require('http');
var redis = require('redis');
var redisAdapter = require('socket.io-redis');
var sticky = require('sticky-session');
var port = process.env.PORT || 3333;
var workers = 3;
var app = express();
var server = http.createServer(app);
var io = require('socket.io')(server);
if(!sticky.listen(server, 3333, {workers: workers})) {
    server.once('listening', () => {
        console.log('server started on port ' + port);
        process.on('exit', () => {
            io.emit('error', {errorType: 'SERVER_SHUTDOWN'});
        });
        process.on('uncaughtException', (err) => {
            console.log('uncaught exception occurred');
            console.log(err);
        });
    });
} else {
    addRedisAdapter(io);
    addIOEventHandler(io);
}
function addRedisAdapter(io) {
    var redisUrl = process.env.REDISTOGO_URL || 'redis://127.0.0.1:6379';
    var redisOptions = require('parse-redis-url')(redis).parse(redisUrl);
    var pub = redis.createClient(redisOptions.port, redisOptions.host, { returnBuffers: true});
    var sub = redis.createClient(redisOptions.port, redisOptions.host, {returnBuffers: true});
    io.on('error', (err) => {
        console.log(err);
    });
    io.on('uncaughtException', (err) => {
        console.log(err);
    });
    io.adapter(redisAdapter({pubClient: pub, subClient: sub}));
    console.log('redis adapter started');
}
function addIOEventHandler(io) {
    //all the events for io
}

现在，我启动redis服务器，然后用这个服务器启动node.js。然后，我打开一个终端窗口，输入"redis-cli shutdown"以强制redis服务器脱机。一旦我这样做了，node.js终端窗口就会一次又一次地通过相同的错误循环。

events.js:154
  throw er; // Unhandled 'error' event
  ^
Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
    at Object.exports._errnoException (util.js:893:11)
    at exports._exceptionWithHostPort (util.js:916:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1075:14)
redis adapter started with url: redis://127.0.0.1:6379

我有process.on（'ncaughtException'…和io.on（'ncaughtException'…以及io.on）（'error'，…处理程序，但每次服务器都在那里循环说有一个"未处理的'错误'事件"有人能帮帮我吗。我不明白这怎么可能是一个未经处理的错误，出于某种原因，它在我心中没有意义。提前感谢您提供的任何可能的帮助。我已经在网络间工作了几个小时，试图找到任何其他可能的选项，但他们都说了同样的话，使用io.on（'error'，或io.oon（'ncaughtException'，或process.on（'ncaughtException'，我都有了，它仍然会出错并崩溃节点。

感谢@SadiRubaiyet为我指明了正确的方向。我不得不向pub和sub添加一个错误事件。一旦我这样做了，当redis关闭时，就不会再有节点崩溃。这是经过编辑的代码。。。

var cluster = require('cluster');
var express = require('express');
var http = require('http');
var redis = require('redis');
var redisAdapter = require('socket.io-redis');
var sticky = require('sticky-session');
var port = process.env.PORT || 3333;
var workers = 3;
var app = express();
var server = http.createServer(app);
var io = require('socket.io')(server);
if(!sticky.listen(server, 3333, {workers: workers})) {
    server.once('listening', () => {
        console.log('server started on port ' + port);
        process.on('exit', () => {
            io.emit('error', {errorType: 'SERVER_SHUTDOWN'});
        });
        process.on('uncaughtException', (err) => {
            console.log('uncaught exception occurred');
            console.log(err);
        });
    });
} else {
    addRedisAdapter(io);
    addIOEventHandler(io);
}
function addRedisAdapter(io) {
    var redisUrl = process.env.REDISTOGO_URL || 'redis://127.0.0.1:6379';
    var redisOptions = require('parse-redis-url')(redis).parse(redisUrl);
    var pub = redis.createClient(redisOptions.port, redisOptions.host, { returnBuffers: true});
    var sub = redis.createClient(redisOptions.port, redisOptions.host, {returnBuffers: true});
    io.on('error', (err) => {
        console.log(err);
    });
    io.on('uncaughtException', (err) => {
        console.log(err);
    });
    /*HERE IS THE NEW CODE THAT MADE IT WORK*/
    pub.on('error', (err) => {
        console.log('error from pub');
        console.log(err);
    });
    sub.on('error', (err) => {
        console.log('error from sub);
        console.log(err);
    });
    /*END*/
    io.adapter(redisAdapter({pubClient: pub, subClient: sub}));
    console.log('redis adapter started');
}
function addIOEventHandler(io) {
    //all the events for io
}

我使用以下行解决了此问题：

 io.of('/').adapter.on('error', function(error){
          console.log('error: ', error);            
       });
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