azure-functions-core-tools: Local Debug for Azure Functions failing due to missing libraries

Good morning - we have a Azure Function App in development running a series of Python based functions.

Python - 3.7.7 azure-functions-core-tools@3.0.2534

Until yesterday, this was running fine both in local debug (Attach to Python Functions) and when deployed to the function app in Azure.

As of yesterday (20200609) it started hitting a series of missing imports within the azure-functions-core-tools module - azure-functions-core-tools\bin\workers\python\3.7\windows\x64\grpc_init.py_

• import grpc_tools
• import grpc_health
• import grpc_reflection

I added the following to requirements.txt

** grpcio==1.29.0 grpcio-tools==1.29.0 grpcio-health-checking==1.29.0**

Which allowed the execution to progress, but now it’s hitting an issue with “google.protobuf” in azure-functions-core-tools\bin\workers\python\3.7\windows\x64\google\protobuf\internal\api_implementation.py

from google.protobuf import enable_deterministic_proto_serialization

Exception has occurred: ImportError cannot import name ‘enable_deterministic_proto_serialization’ from ‘google.protobuf’ (xxx\venv\lib\site-packages\google\protobuf_init_.py)

I’m really confused as this has been running locally just fine for weeks.

I’ve tried re-installing the azure-functions-core-tools, but that hasn’t helped. I don’t think adding more library imports to my venv is the right solution, it seems there is some bug in the azure-functions-core-tools package…