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•Created by haardik | LearnWeb3 on 1/2/2024 in #❓-help

Including multi-tenant config into tRPC context

Hey all, I've been working on upgrading my app to support multi-tenancy, inspired by Vercel's Platforms starter kit. The core of the relevant logic comes down to this Next.js middleware:

export const config = {
  matcher: [
    /*
     * Match all paths except for:
     * 1. /api routes
     * 2. /_next (Next.js internals)
     * 3. /_static (inside /public)
     * 4. all root files inside /public (e.g. /favicon.ico)
     * 5. All files inside subdirectories of /public/static
     */
    '/((?!api/|_next/|_static/|static/|_vercel|[\\w-]+\\.\\w+).*)',
  ],
};

export default function middleware(req: NextRequest) {
  const url = req.nextUrl;

  // Get hostname of request (e.g. demo.vercel.pub, demo.localhost:3000)
  const hostname = req.headers
    .get('host')!
    .replace('.localhost:3000', `.${ROOT_DOMAIN}`);

  const searchParams = req.nextUrl.searchParams.toString();
  const path = `${url.pathname}${
    searchParams.length > 0 ? `?${searchParams}` : ''
  }`;

  // Rewrite root to `/app`
  if (hostname === 'localhost:3000' || hostname === ROOT_DOMAIN) {
    return NextResponse.rewrite(
      new URL(`/app${path === '/' ? '' : path}`, req.url),
    );
  }

  const tenantSlug = hostname.replace(`.${ROOT_DOMAIN}`, '');

  // Rewrite everything else to `/[tenantSlug]`
  return NextResponse.rewrite(new URL(`/${tenantSlug}${path}`, req.url));
}

export const config = {
  matcher: [
    /*
     * Match all paths except for:
     * 1. /api routes
     * 2. /_next (Next.js internals)
     * 3. /_static (inside /public)
     * 4. all root files inside /public (e.g. /favicon.ico)
     * 5. All files inside subdirectories of /public/static
     */
    '/((?!api/|_next/|_static/|static/|_vercel|[\\w-]+\\.\\w+).*)',
  ],
};

export default function middleware(req: NextRequest) {
  const url = req.nextUrl;

  // Get hostname of request (e.g. demo.vercel.pub, demo.localhost:3000)
  const hostname = req.headers
    .get('host')!
    .replace('.localhost:3000', `.${ROOT_DOMAIN}`);

  const searchParams = req.nextUrl.searchParams.toString();
  const path = `${url.pathname}${
    searchParams.length > 0 ? `?${searchParams}` : ''
  }`;

  // Rewrite root to `/app`
  if (hostname === 'localhost:3000' || hostname === ROOT_DOMAIN) {
    return NextResponse.rewrite(
      new URL(`/app${path === '/' ? '' : path}`, req.url),
    );
  }

  const tenantSlug = hostname.replace(`.${ROOT_DOMAIN}`, '');

  // Rewrite everything else to `/[tenantSlug]`
  return NextResponse.rewrite(new URL(`/${tenantSlug}${path}`, req.url));
}

This middleware is set up to explicitly exclude requests to /api Now, within my tRPC router, it is helpful in certain places to be able to access the tenantSlug value. I could go and change all my tRPC queries/mutations to take that as input and change client-side code everywhere but that would be hundreds of functions and even more calls in the client code. I have been thinking about how to get this be part of tRPC's context, but I'm a bit stuck Currently my context looks like this (i have a mix of HTTP and WebSockets)

export async function createContext(
  ctx: CreateWSSContextFnOptions | CreateNextContextOptions,
): Promise<{
  session: Session | null;
  req: IncomingMessage | NextApiRequest;
  res: ws | NextApiResponse;
  prisma: ExtendedPrismaClient;
}> {
  const { req, res } = ctx;

  let session: Session | null;
  try {
    // @ts-expect-error -- This will fail if called client side
    session = await getServerSession(req, res, getAuthOptions(req));
  } catch (error) {
    session = await getSession(ctx);
  }

  const contextInner = await createContextInner();

  return {
    ...contextInner,
    session,
    req,
    res,
  };
}

export async function createContext(
  ctx: CreateWSSContextFnOptions | CreateNextContextOptions,
): Promise<{
  session: Session | null;
  req: IncomingMessage | NextApiRequest;
  res: ws | NextApiResponse;
  prisma: ExtendedPrismaClient;
}> {
  const { req, res } = ctx;

  let session: Session | null;
  try {
    // @ts-expect-error -- This will fail if called client side
    session = await getServerSession(req, res, getAuthOptions(req));
  } catch (error) {
    session = await getSession(ctx);
  }

  const contextInner = await createContextInner();

  return {
    ...contextInner,
    session,
    req,
    res,
  };
}

Since the middleware ignores requests to /api - the req object in context (in case of HTTP calls) doesn't include the subdomain/slug in the rquest headers. I figured someone here had to have run into this in the past and may have figured out a solutin already - so any help is appreciated!

6 replies

TtRPC

•Created by haardik | LearnWeb3 on 10/3/2023 in #❓-help

tRPC Client within Next.js but with external standalone server?

Hi, I have an old Next.js project that used tRPC and we're currently in the process of separating out the frontend and backend parts of it for various reasons. To reuse code, I was hoping to set up a standalone tRPC Server In that case, what's the recommended method of setting up a tRPC Client on the Next side? using @trpc/next or @trpc/react ? I tried (briefly) using @trpc/next and it was giving me issues around not having a QueryClient set - but im not sure if the react method is the way to go either.

3 replies

TtRPC

•Created by haardik | LearnWeb3 on 9/30/2023 in #❓-help

tRPC Websockets with a standalone Bun Server?

Hey folks! Experiementing with setting up a standalone tRPC Server using Bun. The HTTP part is great - i'm wondering if anyone has succeeded getting it to work with Bun's websocket server? if not, i'll continue figuring it out and hopefully add an adapter to tRPC.

4 replies

TtRPC

•Created by haardik | LearnWeb3 on 9/28/2023 in #❓-help

Unable to get mutation to trigger subscription because EventEmitter not being shared

Hey folks, Been struggling with this for a few hours now hopelessly and trying random things - read all related posts in this forum, on github issues, and stackoverflow - and still don't understand what is going on. I have a next app with a custom HTTP server and using tRPC. WSLink etc is all fine - i'm doing everything the proper way. I have a router with these two functions:

 sendMessage: protectedProcedure
    .input(z.string())
    .mutation(async ({ ctx, input }) => {
      try {
        const chatRepo = new CommunityChatRepository(ctx.prisma);
        const result = await chatRepo.sendMessage(ctx.session!.user.id, input);

        if (!result.ok) throw result.error;
        console.log({ namesSendMsg: wsee.eventNames() });

        wsee.emit('onNewMessage', result.value);

        return result.value;
      } catch (error) {
        if (error instanceof TRPCError) {
          throw error;
        } else {
          console.error(error);
          throw new TRPCError({
            code: 'INTERNAL_SERVER_ERROR',
            message: 'Internal server error',
          });
        }
      }
    }),

  onNewMessage: publicProcedure.subscription(() => {
    return observable<ChatMessageWithSenderInformation>((emit) => {
      const onNewMessage = (data: ChatMessageWithSenderInformation) => {
        emit.next(data);
      };

      console.log({ names: wsee.eventNames() });
      wsee.on('onNewMessage', onNewMessage);
      console.log({ names: wsee.eventNames() });

      console.log(`added listener ${wsee.listenerCount('onNewMessage')}`);

      return () => {
        console.log(`removed listener ${wsee.listenerCount('onNewMessage')}`);
        wsee.off('onNewMessage', onNewMessage);
      };
    });
  }),

 sendMessage: protectedProcedure
    .input(z.string())
    .mutation(async ({ ctx, input }) => {
      try {
        const chatRepo = new CommunityChatRepository(ctx.prisma);
        const result = await chatRepo.sendMessage(ctx.session!.user.id, input);

        if (!result.ok) throw result.error;
        console.log({ namesSendMsg: wsee.eventNames() });

        wsee.emit('onNewMessage', result.value);

        return result.value;
      } catch (error) {
        if (error instanceof TRPCError) {
          throw error;
        } else {
          console.error(error);
          throw new TRPCError({
            code: 'INTERNAL_SERVER_ERROR',
            message: 'Internal server error',
          });
        }
      }
    }),

  onNewMessage: publicProcedure.subscription(() => {
    return observable<ChatMessageWithSenderInformation>((emit) => {
      const onNewMessage = (data: ChatMessageWithSenderInformation) => {
        emit.next(data);
      };

      console.log({ names: wsee.eventNames() });
      wsee.on('onNewMessage', onNewMessage);
      console.log({ names: wsee.eventNames() });

      console.log(`added listener ${wsee.listenerCount('onNewMessage')}`);

      return () => {
        console.log(`removed listener ${wsee.listenerCount('onNewMessage')}`);
        wsee.off('onNewMessage', onNewMessage);
      };
    });
  }),

I've added a bunch of console logs to help explain. So, in my logs I see that when the app loads up I get a WS Connection to the server. On the client side, I have trpc.chat.onNewMessage.useSubscription which console logs {names: []} first and then {names: ['onNewMessage']} as it should based on the code for the router. But, when I send a message, the mutation fails to trigger the subscription because it logs {namesSendMsg: []} i.e. for some reason it does;n't recognize the attached listener I thought it was because maybe somehow multiple EventEmitter instances are being created due to HMR - so I did a workaround similar to what we do with Prisma for next dev mode: src/eventEmitter.ts:

import { EventEmitter } from 'events';

import type { ChatMessageWithSenderInformation } from './server/repositories/CommunityChatRepository';

interface WSEvents {
  // Community Chat
  onNewMessage: (message: ChatMessageWithSenderInformation) => void;

  // Trivia
  join: () => void;
  getQuestions: () => void;
  onRankingUpdate: () => void;
  onChoiceUpdate: () => void;
}

export declare interface WSEventEmitter {
  on<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  off<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  once<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  emit<WEv extends keyof WSEvents>(
    event: WEv,
    ...args: Parameters<WSEvents[WEv]>
  ): boolean;
}

export class WSEventEmitter extends EventEmitter {}

const globalForWSEE = globalThis as unknown as { wsee: WSEventEmitter };
const isDevMode = process.env.NODE_ENV !== 'production';

export const wsee = globalForWSEE.wsee || new WSEventEmitter();

if (isDevMode) globalForWSEE.wsee = wsee;

import { EventEmitter } from 'events';

import type { ChatMessageWithSenderInformation } from './server/repositories/CommunityChatRepository';

interface WSEvents {
  // Community Chat
  onNewMessage: (message: ChatMessageWithSenderInformation) => void;

  // Trivia
  join: () => void;
  getQuestions: () => void;
  onRankingUpdate: () => void;
  onChoiceUpdate: () => void;
}

export declare interface WSEventEmitter {
  on<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  off<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  once<WEv extends keyof WSEvents>(event: WEv, listener: WSEvents[WEv]): this;
  emit<WEv extends keyof WSEvents>(
    event: WEv,
    ...args: Parameters<WSEvents[WEv]>
  ): boolean;
}

export class WSEventEmitter extends EventEmitter {}

const globalForWSEE = globalThis as unknown as { wsee: WSEventEmitter };
const isDevMode = process.env.NODE_ENV !== 'production';

export const wsee = globalForWSEE.wsee || new WSEventEmitter();

if (isDevMode) globalForWSEE.wsee = wsee;

this did not help either. using this wsee everywhere doesn't change anything. im lost and have no idea WHY there are supposedly two different event emitter instances being used here?

6 replies

TtRPC

•Created by haardik | LearnWeb3 on 5/9/2023 in #❓-help

How to infer type of a nested object from app router output?

I have a tRPC router than returns a nested object through a db query. It looks like this:

ILessonCommentProps.comments: ({
    _count: {
        likes: number;
        comments: number;
        bookmarks: number;
    };
    comments: ({
        user: GetResult<{
            id: string;
            displayName: string | null;
            email: string | null;
            emailVerified: Date | null;
            ... 17 more ...;
            updatedAt: Date;
        }, unknown>;
        subComments: GetResult<...>[];
    } & GetResult<...>)[];
    bookmarks: {
        ...;
    }[];
    likes: {
        ...;
    }[];
} & GetResult<...>) | null

ILessonCommentProps.comments: ({
    _count: {
        likes: number;
        comments: number;
        bookmarks: number;
    };
    comments: ({
        user: GetResult<{
            id: string;
            displayName: string | null;
            email: string | null;
            emailVerified: Date | null;
            ... 17 more ...;
            updatedAt: Date;
        }, unknown>;
        subComments: GetResult<...>[];
    } & GetResult<...>)[];
    bookmarks: {
        ...;
    }[];
    likes: {
        ...;
    }[];
} & GetResult<...>) | null

I'd like to infer the type of the comments property to use as an interface for props on a component. I tried doing this but this doesn't work:

interface ILessonCommentProps {
  comments: AppRouterOutputs['lessonBuilder']['getLessonLikesCommentsBookmarks']['comments'];
}

interface ILessonCommentProps {
  comments: AppRouterOutputs['lessonBuilder']['getLessonLikesCommentsBookmarks']['comments'];
}

I was wondering if this is even possible?

8 replies

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