ycfuncs 25.8.7

Handler for FastAPI apps in Yandex Cloud Functions

Yalambda

Yandex Cloud Functions handler for FastAPI applications

For what?

I was unable to launch applications written using the FastAPI framework in the form of Yandex cloud functions. So I had to develop an adapter to solve this problem.

Example

from fastapi import FastAPI
from ycfuncs import FastAPIHandler

# For local launch
app = FastAPI()


@app.get("/")
async def root():
    return 'Hello World!'

# Entry point for launch in Yandex cloud function 
handler = FastAPIHandler(app)

local launch

Install uv sync or pip install -r requirements.txt Run in terminal uv run fastapi dev --port=5004 or uvicorn main:app --port=5004

Yandex cloud functions launch

Set entry point to main.handler Request handler for a function in Python

Yandex Cloud ApiGateway

Now you can use Yandex Cloud ApiGateway like this:

openapi: 3.0.0
info:
  title: Sample API
  version: 1.0.0
servers:
- url: https://yourdomain.apigw.yandexcloud.net
paths:
  /some-prefix/{url+}:
    x-yc-apigateway-any-method:
      x-yc-apigateway-integration:
        payload_format_version: '0.1'
        function_id: your-function-id
        tag: $latest
        type: cloud_functions
        service_account_id: your-service-account
      parameters:
        - name: url
          in: path
          description: path
          required: true
          schema:
            type: string

And check curl -XGET https://yourdomain.apigw.yandexcloud.net/some-prefix/ - you should get "Hello World!". In this case {url+} is your APIRouter endpoints.