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MrJohz

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•Created by MrJohz on 4/8/2025 in #❓-help

How can I access the session in fastify when using `useWSS: true`?

Hi @Mr. Joker, I ended up writing my solution up on my blog, you can read that here: https://jonathan-frere.com/posts/trpc-fastify-websockets/ Specifically, the solution I found was this:

// create a new scope so that the hook we add later will only
// affect tRPC-specific requests
app.register((app) => {
  // use a WeakMap to avoid leaking memory by holding on to
  // requests longer than necessary
  const REQS = new WeakMap<
    FastifyRequest | IncomingMessage,
    FastifyRequest
  >();

  app.addHook("onRequest", async (req) => {
    // associate each raw `IncomingMessage` (`req.raw`) with
    // the original `IncomingMessage`
    REQS.set(req.raw, req);
  });

  app.register(fastifyTRPCPlugin, {
    prefix: "/trpc",
    useWSS: true,
    trpcOptions: {
      router,
      onError,
      createContext: ({ req }) => {
        // given either a `FastifyRequest` or an
        // `IncomingMessage`, fetch the related
        // `FastifyRequest` that we saved earlier
        const realReq = REQS.get(req.raw ?? req);
        if (!realReq)
          throw new Error("This should never happen");

        console.log(realReq.session); // logs the session object
        return {};
      },
    },
  });
});

// create a new scope so that the hook we add later will only
// affect tRPC-specific requests
app.register((app) => {
  // use a WeakMap to avoid leaking memory by holding on to
  // requests longer than necessary
  const REQS = new WeakMap<
    FastifyRequest | IncomingMessage,
    FastifyRequest
  >();

  app.addHook("onRequest", async (req) => {
    // associate each raw `IncomingMessage` (`req.raw`) with
    // the original `IncomingMessage`
    REQS.set(req.raw, req);
  });

  app.register(fastifyTRPCPlugin, {
    prefix: "/trpc",
    useWSS: true,
    trpcOptions: {
      router,
      onError,
      createContext: ({ req }) => {
        // given either a `FastifyRequest` or an
        // `IncomingMessage`, fetch the related
        // `FastifyRequest` that we saved earlier
        const realReq = REQS.get(req.raw ?? req);
        if (!realReq)
          throw new Error("This should never happen");

        console.log(realReq.session); // logs the session object
        return {};
      },
    },
  });
});

7 replies

TtRPC

•Created by MrJohz on 4/8/2025 in #❓-help

How can I access the session in fastify when using `useWSS: true`?

I did. Basically, the type of req is wrong: for websockets, it's FastifyRequest | IncomingMessage where IncomingMessage is the raw node request object. To get hold of the FastifyRequest object, you can use a Fastify to listen to all incoming requests, and then save those requests in a WeakMap. Then in the context you can use the WeakMap to fetch the original requests out again. I'll write it up properly tomorrow.

7 replies

SSolidJS

•Created by MrJohz on 1/23/2025 in #support

How can I test that all computations were created in a root?

Thanks, that's helpful!

5 replies

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