Bazel Rules: Python 3 Google App Engine & Google Cloud Functions

This repository contains the Bazel (Starlark) rules to build Python 3 and deploy to Google App Engine and Google Cloud Functions.

Usage

There is a GAE app example and a GCF example in the examples directory.

Google App Engine (Python 3)

Put this in the BUILD file:

py_binary(
    name = "app",
    srcs = [
        "app.py",
    ],
)

py_app_engine(
    name = "app_deploy",
    src = ":app",
    descriptor = "app.yaml",
    entry = "app",
    requirements = [
        "flask",
    ],
)

and run:

examples$ bazel run //app_engine:app_deploy

Google Cloud Functions (Python 3)

Put this in the BUILD file:

py_binary(
    name = "hello",
    srcs = [
        "hello.py",
    ],
)

py_cloud_function(
    name = "hello_deploy",
    src = ":hello",
    entry = "hello",
)

and run:

examples$ bazel run //function:hello_deploy

Features

In the BUILD rule you can also specify:

PyPI (pip) requirements

either as a package list or pointing to a requirements.txt file

The GCP project name

if you don't want to use the default one used by gcloud

Version (App Engine only)

the version string of the GAE deployment

Python Runtime (Cloud Functions only)

the Python runtime to use (default: python37)

Deploy name (Cloud Functions only)

the name of the deployed function (in GCP) and also in the HTTP path

Pub/Sub topic trigger (Cloud Functions only)

if you want your function to be triggered by a Cloud Pub/Sub message

GCS bucket trigger (Cloud Functions only)

if you want your function to be triggered by events from a GCS bucket

General event trigger (Cloud Functions only)

if you want your function to be triggered by other event types

Memory in MiB (Cloud Functions only)

the default is 256 MiB but you can request more, up to 2,048 MiB

Timeout in seconds (Cloud Functions only)

the default is 60 s but you can request up to 540 s.

Requirements

This solution depends on these commands being available:

• The Python 3 interpreter at /usr/bin/python3
• The fish shell at fish
• The Google Cloud SDK at gcloud

Your Bazel workspace should be set to generate a ZIP package for py_binary targets, by setting some parameters in the .bazelrc file, like this.

LICENSE

bazel_for_gcloud_python is released under the Apache 2.0 License.