Introduction

This repo is the Marble backend implementation:

• 1 single go app
• Postgres DB

Getting Started

Setup your environment

Install Go on your laptop (see the version in go.mod).

NB: To handle different versions, you can look at Managing Go installations or use a version manager tool like asdf

Create you own .env file based on .env.example. You can fill it with your own values but it should work locally with the default values (except for third-party services functionalities).

Setup the DB

Launch the postgres DB used by the backend:

docker compose up -d

NB: it creates a marble-backend_postgres-db volume to store PG data.

Firebase emulator suite for local development

Install the Firebase tools:

# Install the Firebase CLI using npm, since the curl script is broken (on 06/09/2024)
npm install -g firebase-tools

# Check the version is at least 13.16.0
firebase --version

Then copy the ./firebase-local-data.example folder to ./firebase-local-data. This folder will be used to store the local data of the Firebase emulator. It is ignored by git.

Then start it using (replace GOOGLE_CLOUD_PROJECT with the value from your .env file):

firebase --project GOOGLE_CLOUD_PROJECT emulators:start --import=./firebase-local-data --export-on-exit

NB: The --import flag is used to import the local data into the emulator. The --export-on-exit flag is used to export the data when the emulator is stopped so you don't lose your changes.

Launch the project

Export your .env file and run the root of the project:

go run . --migrations --server

Using VSCode, you can also run the Migrate and Launch (.env) task in the "Run and debug" tab. This will load your env file, migrate the DB and start the server.

Application flags

The application can be run with the following flags:

• --migrations: run the migrations
• --server: run the server
• --scheduled-executer: execute scheduled scenario job
• --data-ingestion: run data ingestion job
• --cron-scheduler: background job that automatically runs the cron jobs
• --send-pending-webhook-events: retry sending failed webhooks

NB: .vscode/launch.json contains the configuration to run the app with these flags.

API

The rooting of the application is defined inside api/routes.go.

For further information on the API, you can also refer to the following resources:

• our API docs for public facing reference
• the Open API Specification defined in the frontend repository here.

DB Seed and migrations

The application uses goose to manage migrations.

Migrations are located in the repositories/migrations folder.

Execute the program with flags -migrations to run migrations

To create a new migration, you can use the following command:

make generate_migration

FAQ

How to update firebase local data ?

• Run firebase emulator with paramater: --export-on-exit
• Add user, change options...
• Exit the emulator

NB: The data will be saved in the ./firebase-local-data folder. If you want to share the data, you can copy it to ./firebase-local-data.example and commit it.

How to reset the DB ?

docker volume rm marble-backend_postgres-db deletes the PG volume, useful to reset the app to a known state

In practice, this single-line will delete the stack and create a new one: docker compose down && docker volume rm marble-backend_postgres-db && docker compose up -d