How to include OpenCV when building Flask app from Github using App Platform?

👋 @Occutracker

Great question, I think this would be a good candidate for using Dockerfile based builds.

I hacked together a sample flask app that uses opencv. Disclaimer I don’t have any Python/Flask experience so this might not be best practice.

flask-opencv-streaming sample

A Dockerfile based build will automatically be detected if the Dockerfile exists in the root of the project. My dockerfile looks like:

FROM ubuntu
RUN apt-get update -y --fix-missing --allow-releaseinfo-change
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y python3.6 python3-pip python3-pip python-dev build-essential libgl1-mesa-glx libsm6 libxext6 libglib2.0-0
RUN mkdir /app
WORKDIR /app
COPY . /app/

RUN pip3 install --upgrade pip
RUN pip3 install flask
RUN pip3 install -r requirements.txt
CMD ["python3", "app.py"]

and my DO app spec looks like:

name: flask-opencv-streaming
region: nyc
services:
- dockerfile_path: Dockerfile
  github:
    branch: master
    deploy_on_push: true
    repo: jonfriesen/flask-opencv-streaming
  http_port: 8080
  instance_count: 1
  instance_size_slug: basic-xs
  name: flask-opencv-streaming
  routes:
  - path: /
  source_dir: /