Theo's Typesafe Cult•2y ago

Integrating a Python endpoint in the t3 stack

Is it possible to integrate a Python endpoint in the t3 stack? I need a Python endpoint because the package that I wanna use is an AI one and currently unavailable in JS/TS.

18 Replies

Tom•2y ago

couldnt you just run it as a separate server and then call it from within a trpc endpoint? not the most efficent but itll get the job done if you want to leverage trpc

cje•2y ago

Write a GraphQL or OpenAPI Schema for it and make a request to it from your tRPC backend

jdsl•2y ago

This might be what you are looking for if using Vercel for hosting: https://vercel.com/docs/concepts/functions/serverless-functions/runtimes/python

Vercel Documentation

Using the Python Runtime with Serverless Functions

Learn how to use the Python runtime to compile Python Serverless Functions on Vercel.

shikishikichangchang•2y ago

Yes, I can host a separate api for that endpoint but ideally I would like to keep everything in the same monorepo. Is it possible? Has anyone done it? I read online that some people got it working by putting the *.py files in /api (not /pages/api) I tried and couldnt get it working

import type { ChildProcessWithoutNullStreams } from "child_process";
import { spawn } from "child_process";
import { trycatch } from "../../../utils/trycatch";
import { createTRPCRouter, protectedProcedure } from "../trpc";

export const pythonRouter = createTRPCRouter({
  test: protectedProcedure.query(async () => {
    return await trycatch({
      fn: () => {
        const python: ChildProcessWithoutNullStreams = spawn("python3", [
          "src/server/api/python/testing.py",
        ]);
        return new Promise<string>((resolve, reject) => {
          let output = "";

          python.stdout.on("data", (data: Buffer) => {
            output += data.toString();
          });

          python.stderr.on("data", (data: Buffer) => {
            reject(data.toString());
          });

          python.on("close", (code) => {
            if (code && code !== 0) {
              reject(`Process exited with code ${code}`);
            } else {
              resolve(output);
            }
          });
        });
      },
      errorMessages: ["Failed to run python code"],
    })();
  }),
});

import type { ChildProcessWithoutNullStreams } from "child_process";
import { spawn } from "child_process";
import { trycatch } from "../../../utils/trycatch";
import { createTRPCRouter, protectedProcedure } from "../trpc";

export const pythonRouter = createTRPCRouter({
  test: protectedProcedure.query(async () => {
    return await trycatch({
      fn: () => {
        const python: ChildProcessWithoutNullStreams = spawn("python3", [
          "src/server/api/python/testing.py",
        ]);
        return new Promise<string>((resolve, reject) => {
          let output = "";

          python.stdout.on("data", (data: Buffer) => {
            output += data.toString();
          });

          python.stderr.on("data", (data: Buffer) => {
            reject(data.toString());
          });

          python.on("close", (code) => {
            if (code && code !== 0) {
              reject(`Process exited with code ${code}`);
            } else {
              resolve(output);
            }
          });
        });
      },
      errorMessages: ["Failed to run python code"],
    })();
  }),
});

I was able to get this code to run locally It basically calls a python file located next to itself but it fails to run on vercel I suspect the reason is that vercel doesnt have python installed I was wondering if it's possble to install all nextjs dependencies and pythons?

Patrick•2y ago

Take a look again at the link above: https://vercel.com/docs/concepts/functions/serverless-functions/runtimes/python

Vercel Documentation

Using the Python Runtime with Serverless Functions

Learn how to use the Python runtime to compile Python Serverless Functions on Vercel.

shikishikichangchang•2y ago

I did

Patrick•2y ago

The page is answering your question: Yes its possible, yes you can install packages (see bottom of the page requirements.txt)

shikishikichangchang•2y ago

Im asking if it's possible to install both nextJS and python together under pages/api

Patrick•2y ago

~~Yes, thats possible~~

Patrick•2y ago

Ah, maybe not. In their example repo it looks like this: https://github.com/vercel/examples/tree/main/python/hello-world

GitHub

examples/python/hello-world at main · vercel/examples

Enjoy our curated collection of examples and solutions. Use these patterns to build your own robust and scalable applications. - examples/python/hello-world at main · vercel/examples

Patrick•2y ago

So you might need another deployment.

Patrick•2y ago

Though based on this, its possible: https://stackoverflow.com/questions/63652016/python-serverless-function-vercel-next-js

Stack Overflow

Python Serverless Function Vercel - Next.js

I found out that I could use Python to create a serverless function inside a Next.js project. Once deployed to Vercel, it will get converted into a serverless function. I went through the docs and ...

Patrick•2y ago

In short, if you're using another language to write a serverless function inside a Next.js project. Be sure to place it inside an api folder that sits in the root directory of the project (if there's none, create one).

In short, if you're using another language to write a serverless function inside a Next.js project. Be sure to place it inside an api folder that sits in the root directory of the project (if there's none, create one).

shikishikichangchang•2y ago

That's what I did and failed haha .

jdsl•2y ago

Deployment failed or getting error hitting the endpoint? I'll test on one of my projects to see if I can get it to work Found some more info here: https://github.com/vercel/vercel/discussions/6197 https://github.com/vercel/vercel/discussions/4023 Looks like while it is possible to mix & match, it's not as straight forward. You have to move the api files to the root of your project /api and it might cause a few issues with 3rd party packages that are expecting pages/api to exist.

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Integrating a Python endpoint in the t3 stack