From anywhere to AWS Lambda in one line with Zappa

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The problem

We always want to do continus integration and deployment with our repo. Bitbucket comes with handy build function.

Version releasing with Zappa is easy: zappa update xxx will make a release, and zappa rollback xxx -n 3 would revert the changes.

But Zappa is currently broken on Python 3.7 as Zappa is using async as package name, while Python 3.7 shall use async and await as reserved names.

Locally I use Python 3.7 with macOS, but I have to support Windows + macOS + Ubuntu + CentOS: how can I quickly make release everywhere?

Solution

Local

Refer to https://blog.zappa.io/posts/docker-zappa-and-python3.

LambCI has made a couple of Docker images that would simulate AWS Lambda, located at https://github.com/lambci/docker-lambda , which provides handy shell access.

With CI

With some hacking we can make a Docker image for release, as in https://blog.zappa.io/posts/simplified-aws-lambda-deployments-with-docker-and-zappa . But this image only supports Python 2.7.

A Python 3.6 version is located at https://cloud.docker.com/repository/docker/cnbeining/zappa3 . And we can have a one-liner:

docker run -e AWS_SECRET_ACCESS_KEY=xxxxxxxxx -e AWS_ACCESS_KEY_ID=AKXXXXXXXXXXX -e AWS_DEFAULT_REGION=us-west-2 -v $(pwd):/var/task --rm cnbeining/zappa3 bash -c "virtualenv -p python3 docker_env && source docker_env/bin/activate && pip install -r requirements.txt && zappa update && rm -rf docker_env"

This command will create a environment, attach your current folder, install all the requirements, update the version, and remove all the garbage.

One note: DO NOT SET profile in zappa_settings.json. This image will automatically login with your key.

Reference:

https://blog.zappa.io/posts/continuous-zappa-deployments-with-travis

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