An implementation of the Socket.IO protocol for Deno.
Table of content:
import { serve } from "https://deno.land/[email protected]/http/server.ts";
import { Server } from "https://deno.land/x/[email protected]/mod.ts";
const io = new Server();
io.on("connection", (socket) => {
console.log(`socket ${socket.id} connected`);
socket.emit("hello", "world");
socket.on("disconnect", (reason) => {
console.log(`socket ${socket.id} disconnected due to ${reason}`);
});
});
await serve(io.handler(), {
port: 3000,
});And then run with:
$ deno run --allow-net index.ts
Like the Node.js server, you can also provide types for the events sent between the server and the clients:
interface ServerToClientEvents {
noArg: () => void;
basicEmit: (a: number, b: string, c: Buffer) => void;
withAck: (d: string, callback: (e: number) => void) => void;
}
interface ClientToServerEvents {
hello: () => void;
}
interface InterServerEvents {
ping: () => void;
}
interface SocketData {
user_id: string;
}
const io = new Server<
ClientToServerEvents,
ServerToClientEvents,
InterServerEvents,
SocketData
>();You need to use the .handle() method:
import { serve } from "https://deno.land/[email protected]/http/server.ts";
import { Server } from "https://deno.land/x/[email protected]/mod.ts";
import { Application } from "https://deno.land/x/[email protected]/mod.ts";
const app = new Application();
app.use((ctx) => {
ctx.response.body = "Hello World!";
});
const io = new Server();
io.on("connection", (socket) => {
console.log(`socket ${socket.id} connected`);
socket.emit("hello", "world");
socket.on("disconnect", (reason) => {
console.log(`socket ${socket.id} disconnected due to ${reason}`);
});
});
const handler = io.handler(async (req) => {
return await app.handle(req) || new Response(null, { status: 404 });
});
await serve(handler, {
port: 3000,
});Default value: /socket.io/
It is the name of the path that is captured on the server side.
Caution! The server and the client values must match (unless you are using a path-rewriting proxy in between).
Example:
const io = new Server(httpServer, {
path: "/my-custom-path/",
});Default value: 45000
The number of ms before disconnecting a client that has not successfully joined a namespace.
Default value: 20000
This value is used in the heartbeat mechanism, which periodically checks if the connection is still alive between the server and the client.
The server sends a ping, and if the client does not answer with a pong within
pingTimeout ms, the server considers that the connection is closed.
Similarly, if the client does not receive a ping from the server within
pingInterval + pingTimeout ms, the client also considers that the connection
is closed.
Default value: 25000
See pingTimeout for more explanation.
Default value: 10000
This is the delay in milliseconds before an uncompleted transport upgrade is cancelled.
Default value: 1e6 (1 MB)
This defines how many bytes a single message can be, before closing the socket. You may increase or decrease this value depending on your needs.
Default value: -
A function that receives a given handshake or upgrade request as its first parameter, and can decide whether to continue or not.
Example:
const io = new Server({
allowRequest: (req, connInfo) => {
return Promise.reject("thou shall not pass");
},
});Default value: -
A set of options related to Cross-Origin Resource Sharing (CORS).
Example:
const io = new Server({
cors: {
origin: ["https://example.com"],
allowedHeaders: ["my-header"],
credentials: true,
},
});Default value: -
A function that allows to edit the response headers of the handshake request.
Example:
const io = new Server({
editHandshakeHeaders: (responseHeaders, req, connInfo) => {
responseHeaders.set("set-cookie", "sid=1234");
},
});Default value: -
A function that allows to edit the response headers of all requests.
Example:
const io = new Server({
editResponseHeaders: (responseHeaders, req, connInfo) => {
responseHeaders.set("my-header", "abcd");
},
});The library relies on the standard log module, so you can display the internal
logs of the Socket.IO server with:
import * as log from "https://deno.land/[email protected]/log/mod.ts";
await log.setup({
handlers: {
console: new log.handlers.ConsoleHandler("DEBUG"),
},
loggers: {
"socket.io": {
level: "DEBUG",
handlers: ["console"],
},
"engine.io": {
level: "DEBUG",
handlers: ["console"],
},
},
});Custom adapters can be used to broadcast packets between several Socket.IO servers.
Documentation: https://socket.io/docs/v4/redis-adapter/
import { serve } from "https://deno.land/[email protected]/http/server.ts";
import {
createRedisAdapter,
createRedisClient,
Server,
} from "https://deno.land/x/[email protected]/mod.ts";
const [pubClient, subClient] = await Promise.all([
createRedisClient({
hostname: "localhost",
}),
createRedisClient({
hostname: "localhost",
}),
]);
const io = new Server({
adapter: createRedisAdapter(pubClient, subClient),
});
await serve(io.handler(), {
port: 3000,
});
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