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Rust Backend Stack

Setup

Installing Rust and Cargo

Install Rust as described here.

Installing sqlx-cli

SQLx is an async, pure Rust SQL crate featuring compile-time checked queries without a DSL.

SQLx-CLI is SQLx's associated command-line utility for managing databases, migrations, and enabling "offline" mode with sqlx::query!() and friends. It is published on the Cargo crates registry as sqlx-cli and can be installed like so:

cargo install sqlx-cli --features postgres

Running Postgres

The following script will start the latest version of Postgres using Docker, create the database and run the migrations.

./scripts/init_db.sh

Preparing SQLx data

There are 3 steps to building with "offline mode":

  • Enable the SQLx's Cargo feature offline
    • E.g. in your Cargo.toml, sqlx = { features = [ "offline", ... ] }
  • Save query metadata for offline usage
    • cargo sqlx prepare
  • Build

Configuring the Application

Configuring the backend application is done, preferentially, via environment variables. To make working with environment variables easier during development, we can use .env files to avoid having to define the variables every time.

As a starting point, you can simply cp sample.env .env in this repo and modify the .env file as described by the comments there.

Starting the Application

With everything else set up, all you need to do at this point is:

cargo run

If successful, the API server is now listening at port 8080.

Hot Reload

Use cargo-watch for hot reloading the server.

cargo watch -x run

Quality Assurance

Testing

Run unit tests with:

cargo test

Run behavioral tests with:

cargo test --test cucumber

Output World on fail with:

cargo test --test cucumber -- -vv

Formatting

Format with:

cargo fmt --check

Linting

Lint with:

cargo clippy -- -D warnings

Code Coverage

Check code coverage:

cargo tarpaulin --verbose --workspace

License

Licensed under MIT license. Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, shall be licensed as above, without any additional terms or conditions.

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