Installing SQLAlchemy in Consumption plan

Runtime:

Resource: Azure Function Type: functionapp,Linux

Libraries:

• Azure Functions version: 1.0.7
• Func version: 2.7.1948

Description

Having sqlalchemy in my requirements.txt produces the following when I build the function app:

• running --build local errors with the following:

ERROR: cannot install SQLAlchemy-1.3.12 dependency: binary dependencies without wheels 
are not supported when building locally. Use the "--build remote" option to build 
dependencies on the Azure Functions build server, or "--build-native-deps" option 
to automatically build and configure the dependencies using a Docker container. More 
information at https://aka.ms/func-python-publish

• running --build remote appears to succeed, but running an endpoint results in a ModuleNotFound: sqlalchemy error in the logs
• running --build-native-deps appears to succeed, but running an endpoint results in a ModuleNotFound: sqlalchemy error in the logs

SQLAlchemy doesn’t yet issue wheels, and the build code seems to rely on there being a wheel available.

I think SQLAlchemy does some C compilation when it’s built, although I can’t actually remember, but according to the error message I get with --build local, either of these options should work. And neither of them errors. But in that case - why isn’t SQLAlchemy available to the function app?

[borancar]

So, it boils down to Linux Consumption plans not supporting installation from requirements.txt. The package needs to come with all dependencies included. So, you basically have to use func to resolve the dependencies locally and prepare everything. Run:

func azure functionapp publish <....> --build local --build-native-deps

but stop it at:

Running 'docker exec -t 9602cd chmod +x /ziptofs.sh'..done

Then you can zip up the files, making sure to include the generated .python_packages folder as part of your zip package, as that contains all the dependencies.

[borancar]

I would like to reopen this as I’m having the following issue now when running the Function (with the correct flags applied by my patch to the terraform provider and confirmed within the App Settings). Note that my requirements.txt includes the required eventhub (azure-eventhub==1.3.*):

Exception while executing function: Functions.SessionWriter <--- Result: Failure Exception: ModuleNotFoundError: No module named 'azure.eventhub'
Stack:
    File "/azure-functions-host/workers/python/3.6/LINUX/X64/azure_functions_worker/dispatcher.py", line 242, in _handle__function_load_request func_request.metadata.entry_point)
    File "/azure-functions-host/workers/python/3.6/LINUX/X64/azure_functions_worker/loader.py", line 66, in load_function mod = importlib.import_module(fullmodname)
    File "/usr/local/lib/python3.6/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level)
    File "/home/site/wwwroot/SessionWriter/__init__.py", line 1, in <module> from . import sessionsparser File "/home/site/wwwroot/SessionWriter/sessionsparser.py", line 1, in <module> from . import SessionsWriter
    File "/home/site/wwwroot/SessionWriter/SessionsWriter.py", line 4, in <module> from . import aslogger as logger
    File "/home/site/wwwroot/SessionWriter/aslogger.py", line 2, in <module> from . import EventhubsWriter
    File "/home/site/wwwroot/SessionWriter/EventhubsWriter.py", line 2, in <module> from azure.eventhub import EventHubClient, Receiver, Offset, EventData