How to create API in AWS which accesses S3 and lambda in parallel?

Question

context

I want to build an API which accepts a file and text parameters together using multipart/form-data. AWS Lambda then performs operations on the file and returns some text. For example

curl -X POST \
  http://my-endpoint.com \
  -F lang=eng \ 
  -F config=text \ 
  -F image=@/home/myfile.jpg
#lang and config are text, image is file. Text is returned

problem

I can build API gateway+lambda or API gateway+S3 APIs. But I'm not getting how to combine them in parallel for the desired effect.

Edit: By parallel I mean one API call starts this sequence-.
POST->save file in S3->read file in lambda->process using passed variables->response

have you looked it github.com/aws-samples/lambda-refarch-fileprocessing? — user8060120
– user8060120, Commented Nov 15, 2019 at 13:24

Chris Pollard · Accepted Answer · 2019-11-15 16:34:10Z

1

There are a few options here that I can think of.

You can make the lambda function handle the S3 actions for you instead of integrating directly between API Gateway and S3.

Alternatively, you may be able to use web sockets to keep a connection open. The flow would be connect to API (Web socket established) -> POST to API GWAY + API -> s3 put triggers LAMBDA -> Lambda processes and responds via websock.

The first approach may be more achievable.

answered Nov 15, 2019 at 16:34

Chris Pollard

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