Branch	Status
develop
master

• Description
• Dependencies
• Service API
• Local Development
• Docker helpers
• Versioning
• Deployment

A REST Microservice which creates and returns short urls, using Flask and Gunicorn, with docker containers as a mean of deployment.

This service needs an external dynamodb database.

This service has three endpoints :

• Checker GET
• Shortlink Creation POST
• URL recuperation GET

You can find a more detailed description of the endpoints in the OpenAPI Spec

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

This route takes a json containing an url as a payload. It checks if the hostname and domain are part of the allowed names and domains, then create a shortened url that is stored in a dynamodb database. If the given url already exists, within dynamodb, it returns the already existing shortened url instead.

This routes search the database for the given ID and returns a json containing the corresponding url if found. The redirect parameter redirect the user to the corresponding url instead if set to true.

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

First, you'll need to clone the repo

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

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

make setup

The other service that is used (DynamoDB local) is wrapped in a docker compose. Starting DynamoDB local is done with a simple

docker-compose up

That's it, you're ready to 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 lint

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

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.

For testing the locally served application with the commands below, be sure to set ENV_FILE to .env.default and start a local DynamoDB image beforehand with:

docker-compose up &
export ENV_FILE=.env.default

The following three make targets will serve the application locally:

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

make dockerrun

This will serve the application with the wsgi server, inside a container. To stop serving through containers,

make shutdown

Is the command you're looking for.

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-shortcut: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-shortcut: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-shortcut: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

When creating a PR, terraform should run a codebuild job to test, build and push automatically your PR as a tagged container.

This service is to be delployed to the Kubernetes cluster once it is merged.

The service is configured by Environment Variable: