[AWS, Python] Can't use AWS Lambda Layers to share code between lambdas

Serverless Framework
, ,
1

Hello guys, I’m trying to use Serverless to create a really small mock API to play a little bit with the tool and with AWS Lambdas.
I’m trying to create a layer so I can share a piece of code with the endpoints. I plan to have a lambda function for every major endpoint and share some code using layers, so I’ve created a small project where I have two functions and one layer in the serverless.yml file.
The problem is that when I invoke one of the two functions I get this error from AWS:
{
“errorMessage”: “Unable to import module ‘esg.esg’: No module named ‘shared’”,
“errorType”: “Runtime.ImportModuleError”,
“stackTrace”: []
}
I’m using Python and I’ve tried multiple ways to make the layer, by creating just a Python module (a .py file) or a Python package or even a full Python package that can be installed via pip.

This is my yaml file:
service: sapi-layers

frameworkVersion: ">=1.67.3"

provider:
  name: aws
  runtime: python3.8
  lambdaHashingVersion: 20201221
  region: eu-central-1

package:
  exclude:
    - node_modules/**
    - venv/**
    - .direnv/**

functions:
  esg:
    handler: esg.esg.handler
    events:
      - http:
          path: /esg/{proxy+}
          method: ANY
    layers:
      - { Ref: SharedLambdaLayer }

  risk:
    handler: risk.risk.handler
    events:
      - http:
          path: /risk/{proxy+}
          method: ANY
    layers:
      - { Ref: SharedLambdaLayer }

layers:
  shared:
    path: shared
    compatibleRuntimes:
      - python3.8
    allowedAccounts:
      - "*" # ALL accounts!

plugins:
  - serverless-python-requirements

custom:
  pythonRequirements:
    usePoetry: true
    # dockerizePip: non-linux

and here’s the tree output so you can see my dir structure (I’ve omitted node_modules):
.
├── esg
│ ├── esg.py
│ ├── init.py
│ └── pycache
│ ├── esg.cpython-38.pyc
│ └── init.cpython-38.pyc
├── layers
│ └── shared
│ ├── setup.cfg
│ ├── setup.py
│ └── shared
│ ├── init.py
│ └── utils.py
├── package.json
├── package-lock.json
├── poetry.lock
├── pyproject.toml
├── risk
│ ├── init.py
│ └── risk.py
├── serverless.yml
└── shared
├── init.py
└── utils.py

In my Python files I just import the packages normally using from shared.utils import foo
Could you please tell me what’s wrong?
Thanks in advance!