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As means of demonstrating this last property, let's create a simple CLI tool for adding numbers - we'll add logging debug messages and timing reports as optional features that can be enabled using flags. I'm going to use typer to turn our service into a CLI application:
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I first learned of this pattern in Go's go-kit where I've seen it called "service middlewares". The Design Patterns book describes something similar as the "decorator" pattern - not to be confused with Python decorators, which have the unfortunate property of melding themselves with what they decorate, which limits their practical usefulness, at least as far as reducing coupling is concerned.
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A working example of the protocol-based implementation can be found on GitHub.
