MatterhornApiService

Web API service for Matterhorn implemented with Go.

Requirements

To build and run MatterhornApiService locally you will need:

• Go 1.14 or higher
• golang-migrate CLI tool (used to execute database migrations - see installation instructions below)
• Docker Desktop (used to host a local instance of mysql-server)

Setup

This section documents how to set up your environment to run MatterhornApiService.

Go Runtime

MatterhornApiService is built to run on Go v1.14.

Configuring Environment Variables

MATTERHORN_ENV - Defines the environment configuration to be used. Expected values include dev and prod. This determines the database endpoint and schema name is used.

MATTERHORN_DB_PASSWORD - Specifies the password used to connect to the database instance. User name is expected to be "admin" for now.

For a given environment stage, configuration files are loaded in the following order from lowest to highest priority:

1. .env
2. .env.local
3. .env.
4. .env..local

Local configuration can be modified for development by creating local configuration files (e.g. .env.local, .env.dev.local). These files are ignored by git and should not be checked into source control.

Build

Use the Go CLI to build the application go build

Run

Use the Go CLI to run the application. go run .

Test

Use the Go CLI to execute unit tests. go test

Adding new APIs

MatterhornApiService follows a spec-first approach to defining API endpoints using GraphQL.

To add, remove, or modify an API, first add any new types to the schema document graph/schema.graphqls. Next, run go generate ./... to generate new and updated Go types and resolver implementation stubs. Then implement any new resolvers in graph/schema.resolvers.go. If you need to define a modified Go type to use in place of the one that was auto-generated, you can define it in graph/model, as has been done for graph/model/user.go. One useful reason to do this is to replace a reference to a "child" entity with an ID; this will trigger generation of a dependent resolver that will only execute to retrieve the corresponding field if it is requested.

CI/CD

MatterhornApiService is configured to deploy to AWS Elastic Beanstalk.

GitHub Actions for this repository are configured to automatically deploy to Matterhorn's production Elastic Beanstalk environment in response to commits being pushed to master.

Database Migrations

MatterhornApiService uses golang-migrate to execute database migrations on startup.

VSCode tasks are defined for migrating the development database or rolling back the most recently applied migration. These tasks require both that the MATTERHORN_DB_PASSWORD environment variable is set and that the golang-migrate CLI tool is installed.

You can install this tool on Windows by first installing the Scoop package manager and then running scoop install migrate. On macOS, use homebrew and run brew install golang-migrate.