Reproduction of an error using the Azure IoT Python SDK in an Azure Functions app on an Apple M1 Mac

Steps to reproduce the error

• Install the Azure Functions CLI using HomeBrew under Rosetta 2

  Core Tools Version:       3.0.3233 Commit hash: d1772f733802122a326fa696dd4c086292ec0171 
  Function Runtime Version: 3.0.15193.0
  

• Create a new Python Virtual Environment using Python 3.8:

  /usr/bin/python3 -m venv .venv

• Activate the Virtual Environment:

  source .venv/bin/activate

• From a new folder, create a new functions app:

  func init --source-control true --worker-runtime python

• Create a new HTTP trigger:

  func new --name HttpExample --template "HTTP trigger" --authlevel "anonymous"

• Edit the requirements.txt file and add the azure-iot-hub package

• Install the packages:

  pip install -r requirements.txt

  You may need to install CMAKE via HomeBrew if it's not installed on your Mac

• Edit the __init__.py file in the HttpExample folder , and add the following import below the existing imports:

  from azure.iot.hub import IoTHubRegistryManager

• Start the functions app:

  func start

You can find the source for this in the function-app folder.

Expected

• The functions host should start pretty quickly and host the HTTP trigger

Actual

• The functions runtime starts really slowly (minutes instead of seconds)

• The following error appears:

  [2021-01-22T00:04:13.014Z] Result: Failure
  [2021-01-22T00:04:13.014Z] Exception: ImportError: dlopen(/Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/uamqp/c_uamqp.cpython-38-darwin.so, 2): Symbol not found: _SASToken_CreateString
  [2021-01-22T00:04:13.014Z]   Referenced from: /Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/uamqp/c_uamqp.cpython-38-darwin.so
  [2021-01-22T00:04:13.014Z]   Expected in: flat namespace
  [2021-01-22T00:04:13.014Z]  in /Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/uamqp/c_uamqp.cpython-38-darwin.so. Troubleshooting Guide: https://aka.ms/functions-modulenotfound
  [2021-01-22T00:04:13.014Z] Stack:   File "/usr/local/Cellar/azure-functions-core-tools@3/3.0.3233/workers/python/3.8/OSX/X64/azure_functions_worker/dispatcher.py", line 271, in _handle__function_load_request
  [2021-01-22T00:04:13.014Z]     func = loader.load_function(
  [2021-01-22T00:04:13.014Z]   File "/usr/local/Cellar/azure-functions-core-tools@3/3.0.3233/workers/python/3.8/OSX/X64/azure_functions_worker/utils/wrappers.py", line 34, in call
  [2021-01-22T00:04:13.015Z]     raise extend_exception_message(e, message)
  [2021-01-22T00:04:13.015Z]   File "/usr/local/Cellar/azure-functions-core-tools@3/3.0.3233/workers/python/3.8/OSX/X64/azure_functions_worker/utils/wrappers.py", line 32, in call
  [2021-01-22T00:04:13.015Z]     return func(*args, **kwargs)
  [2021-01-22T00:04:13.015Z]   File "/usr/local/Cellar/azure-functions-core-tools@3/3.0.3233/workers/python/3.8/OSX/X64/azure_functions_worker/loader.py", line 76, in load_function
  [2021-01-22T00:04:13.015Z]     mod = importlib.import_module(fullmodname)
  [2021-01-22T00:04:13.015Z]   File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
  [2021-01-22T00:04:13.015Z]     return _bootstrap._gcd_import(name[level:], package, level)
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  [2021-01-22T00:04:13.015Z]   File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  [2021-01-22T00:04:13.015Z]   File "/Users/jimbennett/GitHub/iot-func-error/HttpExample/__init__.py", line 5, in <module>
  [2021-01-22T00:04:13.015Z]     from azure.iot.hub import IoTHubRegistryManager
  [2021-01-22T00:04:13.015Z]   File "/Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/azure/iot/hub/__init__.py", line 6, in <module>
  [2021-01-22T00:04:13.015Z]     from .iothub_registry_manager import IoTHubRegistryManager
  [2021-01-22T00:04:13.015Z]   File "/Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/azure/iot/hub/iothub_registry_manager.py", line 6, in <module>
  [2021-01-22T00:04:13.015Z]     from .iothub_amqp_client import IoTHubAmqpClient as iothub_amqp_client
  [2021-01-22T00:04:13.015Z]   File "/Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/azure/iot/hub/iothub_amqp_client.py", line 22, in <module>
  [2021-01-22T00:04:13.015Z]     import uamqp
  [2021-01-22T00:04:13.015Z]   File "/Users/jimbennett/GitHub/iot-func-error/.venv/lib/python3.8/site-packages/uamqp/__init__.py", line 12, in <module>
  [2021-01-22T00:04:13.015Z]     from uamqp import c_uamqp  # pylint: disable=import-self
  [2021-01-22T00:04:13.015Z] .
  

  if you use any of the methods in the import, you get the same errors and the method call fails.

• This works fine on Widows

• I can't test on Intel Mac as mine is having it's keyboard fixed - will update with results soon

• Outside of an Azure Functions app, the library works with no errors. See the app.py file in the console-app directory. It uses the same library and same import, but no errors.