Skip to content

duan-nguyen/socket.io-deno

 
 

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

24 Commits
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Repository files navigation

Socket.IO server for Deno

An implementation of the Socket.IO protocol for Deno.

Table of content:

Usage

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
>();

With oak

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,
});

Options

path

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/",
});

connectTimeout

Default value: 45000

The number of ms before disconnecting a client that has not successfully joined a namespace.

pingTimeout

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.

pingInterval

Default value: 25000

See pingTimeout for more explanation.

upgradeTimeout

Default value: 10000

This is the delay in milliseconds before an uncompleted transport upgrade is cancelled.

maxHttpBufferSize

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.

allowRequest

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");
  },
});

cors

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,
  },
});

editHandshakeHeaders

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");
  },
});

editResponseHeaders

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");
  },
});

Logs

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"],
    },
  },
});

Adapters

Custom adapters can be used to broadcast packets between several Socket.IO servers.

Redis adapter

Documentation: https://socket.io/docs/v4/redis-adapter/

import { serve } from "https://deno.land/std/http/server.ts";
import {
  createRedisAdapter,
  createRedisClient,
  Server,
} from "https://deno.land/x/socket_io/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,
});

License

ISC

Releases

No releases published

Packages

No packages published

Languages

  • TypeScript 100.0%