service-qrcode

Branch	Status
develop
master

Table of content

• Table of content
• Description
• Dependencies
• Service API
  • Staging Environments
  • checker GET
  • generate GET
• Versioning
• Local Development
  • Make Dependencies
  • Setting up to work
  • Linting and formatting your work
  • Test your work
  • Docker helpers
• Deployment
  • Deployment configuration

Description

A simple REST Microservice that returns a QR code from a given URL, using Flask and Gunicorn, with docker containers as a mean of deployment.

Dependencies

This service doesn't have any external dependencies.

Service API

This service has two endpoints that are summarized below

• checker GET
• generate GET

A detailed descriptions of the endpoints can be found in the OpenAPI Spec.

Staging Environments

Environments	URL
DEV	https://sys-map.dev.bgdi.ch/api/qrcode/
INT	https://sys-map.int.bgdi.ch/api/qrcode/
PROD	https://map.geo.admin.ch/api/qrcode/

checker GET

This is a simple route meant to test if the server is up.

Path	Method	Argument	Response Type
/checker	GET	-	application/json

generate GET

This route takes an url in the json payload, check if the hostname and domain are part of allowed names and domains, then create a QR Code from that URL and return it in a json answer.

Path	Method	Argument	Response Type
/generate	GET	url: unencoded URL to be QR coded	image/png

Versioning

This service uses SemVer as versioning scheme. The versioning is automatically handled by .github/workflows/main.yml file.

See also Git Flow - Versioning for more information on the versioning guidelines.

Local Development

Make Dependencies

The Make targets assume you have python3.7, pipenv, bash, curl, tar, docker and docker-compose installed.

Setting up to work

First, you'll need to clone the repo

git clone git@github.com:geoadmin/service-qrcode.git

Then, you can run the dev target to ensure you have everything needed to develop, test and serve locally

make dev

That's it, you're ready to work.

Linting and formatting your work

In order to have a consistent code style the code should be formatted using yapf. Also to avoid syntax errors and non pythonic idioms code, the project uses the pylint linter. Both formatting and linter can be manually run using the following command:

make format-lint

Formatting and linting should be at best integrated inside the IDE, for this look at Integrate yapf and pylint into IDE

Test your work

Testing if what you developed work is made simple. You have four targets at your disposal. test, serve, gunicornserve, dockerrun

make test

This command run the integration and unit tests.

make serve

This will serve the application through Flask without any wsgi in front.

make gunicornserve

This will serve the application with the Gunicorn layer in front of the application. It also add the route prefix /api/qrcode.

make dockerrun

This will serve the application with the wsgi server, inside a container.

Docker helpers

From each github PR that is merged into master or into develop, one Docker image is built and pushed on AWS ECR with the following tag:

• vX.X.X for tags on master
• vX.X.X-beta.X for tags on develop

Each image contains the following metadata:

• author
• git.branch
• git.hash
• git.dirty
• version

These metadata can be read with the following command

make dockerlogin
docker pull 974517877189.dkr.ecr.eu-central-1.amazonaws.com/service-qrcode:develop.latest

# NOTE: jq is only used for pretty printing the json output,
# you can install it with `apt install jq` or simply enter the command without it
docker image inspect --format='{{json .Config.Labels}}' 974517877189.dkr.ecr.eu-central-1.amazonaws.com/service-qrcode:develop.latest | jq

You can also check these metadata on a running container as follows

docker ps --format="table {{.ID}}\t{{.Image}}\t{{.Labels}}"

To build a local docker image tagged as service-qrcode:local-${USER}-${GIT_HASH_SHORT} you can use

make dockerbuild

To push the image on the ECR repository use the following two commands

make dockerlogin
make dockerpush

Deployment

This service is to be deployed to the Kubernetes cluster. See geoadmin/infra-kubernetes/services/service-qrcode

Deployment configuration

The service is configured by Environment Variable:

Env	Default	Description
LOGGING_CFG	logging-cfg-local.yml	Logging configuration file
ALLOWED_DOMAINS	.*	Comma separated list of regex that are allowed as domain in Origin header
CACHE_CONTROL	public, max-age=31536000	Cache Control header value of the GET /generate endpoint
CACHE_CONTROL_4XX	public, max-age=3600	Cache Control header for 4XX responses
GUNICORN_KEEPALIVE	2	The keepalive setting passed to gunicorn.