Getting started

For this tutorial we will build an application to manage the logic of a bank account. As a simple set of business rules, we want to:

• accept deposits
• provide withdrawals
• allow our customers to write checks
• disallow customers from overdrawing their account

Project setup

Okay let's get some code going. First, up we need a workspace. You know the drill, find your favorite playspace on your hard drive and start a new Rust bin project.

cargo new --bin mybank

There is a lot that happens behind the scenes in a CQRS/event sourcing application, so we'll be using the cqrs-es framework to get us off the ground.
Add these dependencies in your cargo.toml:

[dependencies]
cqrs-es = "0.4.2"
async-trait = "0.1.52"
serde = { version = "1.0", features = ["derive"]}
tokio = { version = "1", features = ["full"] }

All of the examples included here are simplified from the cqrs-demo project. More detailed examples can be found by exploring that package.