Good monday everyone! Small question maybe not related directly to pants but this is a first for me to use Pex and I am having an hard time to make it works with Docker, Poetry and Gunicorn for a Flask application. My Services are Flask App but I need

gunicorn gevent psycogreen

as requirements from poetry only when building my Docker Image. Currently I have added them in another poetry group which appear to include the dependencies when building the Docker image but I can't make it work with the

pex_binary

target, tested to specify the

entry_point

or the

script

in

pex_binary

but I keep getting error message. Currently my build look like this

python_sources()

poetry_requirements(
    name="poetry"
)

pex_binary(
    name = "binary",
    entry_point = "run.py",
    layout = "packed",
    execution_mode = "venv",
)

docker_image(
    name = "img",
    registries = ["<http://docker.io|docker.io>"],
    repository = "repo/service",
    image_tags = ["{build_args.RELEASE_VERSION}"]
)

My Dockerfile looks like this

FROM python:3.10-slim
ARG RELEASE_VERSION=latest

RUN apt-get update \
  && apt-get install -y --no-install-recommends \
    python3-dev \
    libpq-dev \
  && apt-get clean autoclean \
  && apt-get autoremove -y \
  && rm -rf /var/lib/apt/lists/* \
  && rm -f /var/cache/apt/archives/*.deb \

COPY src.services.service/binary.pex /bin/app

ENV CONSUL [h=consul-svc,t=None]
EXPOSE 5001

CMD ["python", "/bin/app"]

This is working for development purpose, but we need

gunicorn

in production I was reading this https://pex.readthedocs.io/en/v2.1.43/recipes.html#gunicorn-and-pex but I don't see how I can reproduce this through Pants! Thanks 🙂

I doubt this will be the entire solution but, at first glance, I wonder if you need to include dependencies in your

pex_binary

target?

pex_binary(
    name = "binary",
    dependencies=[":poetry"],
    entry_point = "run.py",
    layout = "packed",
    execution_mode = "venv",
)

I am not familiar with Gunicorn and Flask but this seems logical to me if the poetry config references the required dependencies. You may have to adjust the entry point according to the pex reference you included.

I have successfully made it runs with

pex_binary(
    name="binary-deps",
    entry_point = "gunicorn",
    dependencies = ["src/services/service","src/services/service:poetry#gevent", "src/services/service:poetry#psycogreen"],
    layout="packed",
    include_sources=False,
    include_tools=True,
)