repro-upstash-aws-lambda-timeout-issue

Reproducing a timeout issue with upstash in AWS Lambda.

What is it all about?

This Repo contains a AWS CDK that defines a HttpGateway and a Lambda src/rateLimiter/index.ts using Node v16 (in this repo we use Node v14 as this is the only version running locally). The lambda uses a rate limiter (utils/rateLimiter.util.ts) using @upstash/ratelimit. When making a request to the Lambda, the rate limiter should decide if the request should go through or not.

What is the issue?

When calling the Lambda, it will time out when running the Upstash rate limiter fn:

START RequestId: fa6547db-4a37-4f25-bac4-5bec8e1ff9cf Version: $LATEST
2022-10-20T11:08:53.732Z        fa6547db-4a37-4f25-bac4-5bec8e1ff9cf    DEBUG   Waiting for upstash
Function 'ratelimit' timed out after 3 seconds
No response from invoke container for ratelimitC4266C65
Invalid lambda response received: Lambda response must be valid json

However, this only happens, if called inside the Lambda. If called in Node (see npm run rateLimiterDirect / utils/runRatelimiterDirectly.ts as example), it works without issues.

Reproduce locally

1. Have both docker and AWS sam installed.
2. Rename .env.example to .env and enter your Upstash credentials
3. Run cdk synth
4. Run npm run runLocal to start the HttpGateway locally
5. Send a GET to http://localhost:3000/ratelimit
6. Server answers with 502 due to the Lambda timing out (check console where you started the gateway)