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Version: 4.x

Cluster 适配器

这个怎么运作

集群适配器允许在Node.js cluster中使用 Socket.IO 。

每个发送给多个客户的数据包 (例如 io.to("room1").emit()socket.broadcast.emit()) 也通过IPC渠道发送给其他客户端。

这个适配器的源代码可以在这里找到。

安装

npm install @socket.io/cluster-adapter

用法

使用 Node.js cluster

const cluster = require("cluster");
const http = require("http");
const { Server } = require("socket.io");
const numCPUs = require("os").cpus().length;
const { setupMaster, setupWorker } = require("@socket.io/sticky");
const { createAdapter, setupPrimary } = require("@socket.io/cluster-adapter");

if (cluster.isMaster) {
console.log(`Master ${process.pid} is running`);

const httpServer = http.createServer();

// setup sticky sessions
setupMaster(httpServer, {
loadBalancingMethod: "least-connection",
});

// setup connections between the workers
setupPrimary();

// needed for packets containing buffers (you can ignore it if you only send plaintext objects)
// Node.js < 16.0.0
cluster.setupMaster({
serialization: "advanced",
});
// Node.js > 16.0.0
// cluster.setupPrimary({
// serialization: "advanced",
// });

httpServer.listen(3000);

for (let i = 0; i < numCPUs; i++) {
cluster.fork();
}

cluster.on("exit", (worker) => {
console.log(`Worker ${worker.process.pid} died`);
cluster.fork();
});
} else {
console.log(`Worker ${process.pid} started`);

const httpServer = http.createServer();
const io = new Server(httpServer);

// use the cluster adapter
io.adapter(createAdapter());

// setup connection with the primary process
setupWorker(io);

io.on("connection", (socket) => {
/* ... */
});
}

使用 PM2

请参阅相关文档.

使用 recluster

cluster.js

const cluster = require("cluster");
const http = require("http");
const { setupMaster } = require("@socket.io/sticky");
const { setupPrimary } = require("@socket.io/cluster-adapter");
const recluster = require("recluster");
const path = require("path");

const httpServer = http.createServer();

// setup sticky sessions
setupMaster(httpServer, {
loadBalancingMethod: "least-connection",
});

// setup connections between the workers
setupPrimary();

// needed for packets containing buffers (you can ignore it if you only send plaintext objects)
// Node.js < 16.0.0
cluster.setupMaster({
serialization: "advanced",
});
// Node.js > 16.0.0
// cluster.setupPrimary({
// serialization: "advanced",
// });

httpServer.listen(3000);

const balancer = recluster(path.join(__dirname, "worker.js"));

balancer.run();

worker.js

const http = require("http");
const { Server } = require("socket.io");
const { setupWorker } = require("@socket.io/sticky");
const { createAdapter } = require("@socket.io/cluster-adapter");

const httpServer = http.createServer();
const io = new Server(httpServer);

// use the cluster adapter
io.adapter(createAdapter());

// setup connection with the primary process
setupWorker(io);

io.on("connection", (socket) => {
/* ... */
});

配置

配置项描述默认值
requestsTimeout服务器间请求的超时时间,例如fetchSockets()serverSideEmit()5000