SvelteKit ?? ??? ??, ??? ?? ??, ??? ?? ?? ??? ???? ?? ???? BullMQ? ???? ??? ??? ??? ?????? ?????? ?? ?? ?? ??? ??? ? ????. ? ?????? ????? ???? ?? ??? ???? ??? ?? ??????. ???? ???!

tl;dr Hooks.server.js?? BullMQ ???? ?????. ??? ??????

BullMQ? ??????

BullMQ? Redis? ?? ???? ???? ???? ?? Node.js ????????. ??? ?? ???? ??? ??????? ????? ???? ? ??? ???. BullMQ? ???, ?? ??, ??? ?? ?? ??? ???? ?? ?? ??? ????? ???? ????? ??? ? ????.

1??: ??? ??

?? ioredis(node.js? Redis ?????)? Bullmq? ?????.

pnpm i -D ioredis bullmq

Vercel? ?? ???? ???? Bullmq ???? ??? ??? ? ???? ???? ??? ?? ???? node.js ???? ????? ???. ??? ??? ??? ??? ??? ?????:

pnpm rm @sveltejs/adapter-auto && pnpm i -D @sveltejs/adapter-node

?? ??? ?? ???? Svelte ??(svelte.config.js)? ?????? ?? ?? ???.

2??: ?? ??? ? ???? ??

???? BullMQ ?? ???? ?? ????? ??? ?????. src/lib/server/ ????? .js ??? ????.

// src/lib/server/background-jobs.js

import { REDIS_URL } from "$env/static/private";
import { Queue, Worker } from "bullmq";
import IORedis from "ioredis";

const Q_NAME = "q";

export const jobsQueue = new Queue(Q_NAME, {
  connection: new IORedis(REDIS_URL),
});

const sleep = (t) => new Promise((resolve) => setTimeout(resolve, t * 100));

export const setupBullMQProcessor = () => {
  new Worker(
    Q_NAME,
    async (job) => {
      for (let i = 0; i <= 100; i++) {
        await sleep(Math.random());
        await job.updateProgress(i);
        await job.log(`Processing job at interval ${i}`);

        if (Math.random() * 200 < 1) throw new Error(`Random error at ${i}`);
      }

      return `This is the return value of job (${job.id})`;
    },
    // https://docs.bullmq.io/bull/patterns/persistent-connections#maxretriesperrequest
    { connection: new IORedis(REDIS_URL, { maxRetriesPerRequest: null }) }
  );
};

??? ? Q_NAME? ??? ???? ???? ?? BullMQ ???? ??????? ???? ??? ??????.

hoos.server.js ???? ??? ???? init ?? ??? ? ??? ???? ???.

// src/hooks.server.js

// ...
import { building } from "$app/environment";
import { setupBullMQProcessor } from "$lib/server/background-jobs";
// ...
if (!building) {
  setupBullMQProcessor();
}
// ...

!building ??? ?? ?? ??? ??(??? Redis ??)? ???? ???? ??? ????.

? BullMQ? ?? SvelteKit ??? ??? ??? ????? ?

?? ??

??? ????? ?? ??? ???? ???? POST ?????? ??? ?????.

// src/routes/+server.ts

import { jobsQueue } from "$lib/server/background-jobs";

export const POST = async () => {
  const { id: jobId } = await jobsQueue.add("job", {});

  /*
  The following code passes the job's progress to the client as a stream.
  If you don't need to update the client with the progress, you can skip
  the following. You can also use web-sockets or polling for that.
  */
  const stream = new ReadableStream({
    async pull(controller) {
      const job = await jobsQueue.getJob(jobId);
      controller.enqueue(
        JSON.stringify(
          job.failedReason
            ? { error: job.failedReason }
            : job.returnvalue
            ? { data: job.returnvalue }
            : { progress: job.progress }
        )
      );
      controller.enqueue("\n");

      if (job.finishedOn) {
        controller.close();
      }

      // wait for 1-second before sending the next status update
      await new Promise((r) => setTimeout(r, 1e3));
    },
  });

  return new Response(stream, {
    headers: { "content-type": "text/plain" },
  });
};

??? ??????? ? ?????? ????? ??? ?? ??? ???? ??? ??? ?????.

<!-- src/routes/+page.svelte -->

<script>
  let result = $state();

  $inspect(result);

  const handleClick = async () => {
    const response = await fetch("/", { method: "post" });
    const reader = await response.body.getReader();
    while (true) {
      const { done, value } = await reader.read();
      if (done) break;
      result = JSON.parse(new TextDecoder().decode(value));
    }

    setTimeout(() => (result = undefined), 3e3);
  };
</script>

{#if result?.error}
  <div>



<p>Here is the output:</p>

<p><img src="/static/imghw/default1.png"  data-src="https://img.php.cn/upload/article/000/000/000/173785153552047.jpg"  class="lazy" alt="background jobs demo using sveltekit and bullmq" loading="lazy"    style="max-width:90%"  style="max-width:90%" data-animated="true"></p>


<hr>

<h3>
  
  
  Bonus ?
</h3>

<p>You can also mount a bull-board dashboard in your SvelteKit app for easy monitoring of background jobs.</p>

<p>Install bull-board dependencies<br>
</p>

<pre class="brush:php;toolbar:false">pnpm i -D @bull-board/api @bull-board/hono @hono/node-server hono

hoos.server.js? ?????.

// src/hooks.server.js

import { building } from "$app/environment";
import { jobsQueue, setupBullMQProcessor } from "$lib/server/background-jobs";
import { createBullBoard } from "@bull-board/api";
import { BullMQAdapter } from "@bull-board/api/bullMQAdapter";
import { HonoAdapter } from "@bull-board/hono";
import { serveStatic } from "@hono/node-server/serve-static";
import { Hono } from "hono";

if (!building) {
  setupBullMQProcessor();
}

const bullboard = (() => {
  const serverAdapter = new HonoAdapter(serveStatic);

  createBullBoard({
    queues: [new BullMQAdapter(jobsQueue)],
    serverAdapter,
  });
  const app = new Hono({ strict: false });
  const basePath = "/jobs";
  serverAdapter.setBasePath(basePath);
  app.route(basePath, serverAdapter.registerPlugin());

  return app;
})();

export const handle = async ({ event, resolve }) => {
  if (event.url.pathname.match(/^\/jobs($|\/)/)) {
    return bullboard.fetch(event.request);
  }

  return resolve(event);
};

?? ?? /jobs? ???? ??? ????? ?????

? ??? BullMQ? ??? SvelteKit? ????? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!