npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

fastify-sse-v2

v4.1.0

Published

Fastify plugin for sending server side events.

Downloads

46,323

Readme

Fastify SSE Plugin

CI check npm version

Fastify plugin for sending Server-sent events.

For [email protected] use [email protected]!

How to use?

yarn add fastify-sse-v2

Register fastify-sse-v2 plugin into your fastify instance:

import { FastifySSEPlugin } from "fastify-sse-v2";

const server = fastify();
server.register(FastifySSEPlugin);

Sending events from AsyncIterable source

import { FastifySSEPlugin } from "fastify-sse-v2";

const server = fastify();
server.register(FastifySSEPlugin);

server.get("/", function (req, res) {
  res.sse(
    (async function* source() {
      for (let i = 0; i < 10; i++) {
        sleep(2000);
        yield { id: String(i), data: "Some message" };
      }
    })()
  );
});

Sending individual events

import { FastifySSEPlugin } from "fastify-sse-v2";

const server = fastify();
server.register(FastifySSEPlugin);

server.get("/", async function (req, res) {
  for (let i = 0; i < 10; i++) {
    await sleep(2000);
    res.sse({ id: String(i), data: "Some message" });
  }
});

fastify.get("/listenForChanges", {}, (request, reply) => {
  const listenStream = fastify.db
    .watch("doc-uuid")
    .on("data", (data) => reply.sse({ data: JSON.stringify(data) }))
    .on("delete", () => reply.sse({ event: "close" }));
  request.socket.on("close", () => listenStream.end());
});
Note
  • When sending individual events, the connection is kept open until you call reply.sseContext.source.end() to terminate the stream.
Sending events from EventEmmiters
import { FastifySSEPlugin } from "fastify-sse-v2";
import { on } from "events";

const server = fastify();
server.register(FastifySSEPlugin);

server.get("/", function (req, res) {
  res.sse(
    (async function* () {
      for await (const [event] of on(eventEmmitter, "update")) {
        yield {
          event: event.name,
          data: JSON.stringify(event),
        };
      }
    })()
  );
});
Note
  • to remove event listeners (or some other cleanup) when client closes connection, you can listen on connection closing event: request.socket.on('close', () => abortController.abort());
Change server send retry behavior
import { FastifySSEPlugin } from "fastify-sse-v2";

const server = fastify();

server.register(FastifySSEPlugin) // retryDelay default 3000

server.register(FastifySSEPlugin, {
  retryDelay: false // disable retryDelay
  retryDelay: 5000 // override 5000
})
Note
  • You can set parameter retryDelay to false to disable the default behavior of sending retry, or set parameter retryDelay to milliseconds override the default 3000 retry interval .