Azure Functions：在Linux下的Python函数中，如何导入opencv/imutils等非标准模块？

Question

I am trying to export my computer vision API, which is functioning correctly under macOS, to an Azure Function.

I tried to use the docker approach:

func azure functionapp publish --build-native-deps

but I keep getting the error:

can't import cv2 and imutils

log file

and

Exception: ImportError: libgthread-2.0.so.0: cannot open shared object file: No such file or directory

Here is the requirements.txt:

requirements.txt

How do I solve this problem? Or must I switch to AWS Lambda?

I have access to Kudu if that's helpful.

Thanks in advance!

Answer 1

The Azure team has updated the default function image to include libglib2.0-dev

You will need to install the headless version of OpenCV through pip instead of the default.

https://pypi.org/project/opencv-python-headless/

Answer 2

I think the issue is lack of the necessary library libgthread . To fix it, you need to add it into your Docker file to build your own image for your function deployment.

On Azure, please follow the section Build the image from the Docker file of the offical document Create a function on Linux using a custom image to add the code below in azure-functions/python:2.0 Docker file.

RUN apt-get update && \
    apt-get install -y libglib2.0-dev

But it will add a new docker image layer, so you can add libglib2.0-dev into azure-functions/base:2.0 like below.

# Line 19
RUN apt-get update && \
    apt-get install -y gnupg wget unzip libglib2.0-dev && \
    wget https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/1.0.0/Microsoft.Azure.Functions.ExtensionBundle.1.0.0.zip && \
    mkdir -p /FuncExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/1.0.0 && \
    unzip /Microsoft.Azure.Functions.ExtensionBundle.1.0.0.zip -d /FuncExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/1.0.0 && \
    rm -f /Microsoft.Azure.Functions.ExtensionBundle.1.0.0.zip