Hands-On Dependency Injection in Go

A quick recap

Before we dive into the changes, let's take a more in-depth look at the registration function provided by our sample service, and its interactions with external resources. The following diagram outlines the steps that are performed during a single call to the register endpoint:

These interactions are as follows:

1. User calls the register endpoint.
2. Our service calls the Exchange Rate Service.
3. Our service saves the registration into the database.

Now let's consider how these interactions could go wrong. Ask yourself the following:

• What can fail or become slow?
• How do I want to react or recover from that failure?
• How are my users ...