The first thing that comes to my mind when I hear "micro-service" is an AWS Lambda.
I worked for a few good years with this wonderful framework called Chalice - https://aws.github.io/chalice/index.html. This is a python framework. I did a lot of research regarding these cloud frameworks and I think this one is the best. Sam (TS framework) is way too heavy, Zappa took me a while to understand and as for Stateless (a JS/TS framework), well, from my personal experience kinda sux (sorry for my language).
At first I thought to do it all using Redis as my database, just for fun, but eventually I went with Postgres. It's an amazingly powerful relational database and I saw it fit here.
So I approached it like so:
- First I bootstrapped a new project and populated all the methods. (app.py)
- Then I wrapped for the database connection (chalicelib/conn.py)
- After that I created the SQL scheme, all needed stored procedures and some population data.
- Lastly, I created some tests to optimistically check all the cases.
- I also added a small
.travis.ymlfile for some initial CI.
To run the project locally, install the dev and regular requirements and simply run the following:
docker run -p 5432:5432 -d -e POSTGRES_USER="user" -e POSTGRES_PASSWORD="pass" -e POSTGRES_DB="db" -v /tmp/pg-data:/var/lib/postgresql/data --name pg postgresdocker exec -i pg psql postgresql://user:pass@0.0.0.0:5432/db < scheme.sql
This will run a local Postgres DB and populate it with data
chalice local
Or simply docker compose up -d
There should be a one-time configuration of the .chalice/config.json file, to set the ENV variables for production.
To deploy from the main branch (having sufficient AWS credentials) just run:
chalice deploy
After any change you can run py.test tests/test_app.py from the root of the project to run all the tests.
If adding more functionality, please add more tests.
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I believe in a clean code which leads to no doubts of what it does, so I spared myself some comments. Usually after reviews of my PR's I add comments if I see anyone struggling to understand something.
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I implemented the password check using a simple query. I understand there should have been some bcrypt or scrypt, but it's a bit of a mess deploying binaries from MacOS to Linux. I usually do a deployment docker for this, but I thought it'd be an overkill here.