OpenApi Parser as a Source Generator

disclaimer

Look... This... Code isn't good...

I wouldn't recommend it for use in production code at this point, but it was meant for me playing with Source Generators.

With that said!

What is this?

This is a Source Generator used to take an OpenAPI definition and can generate a strongly typed HTTP client using it at compile time.

Example usage

namespace OpenAPI.SourceGenerator.Examples;

[OpenApiClient("sample.yaml")]
public partial class Client {
    // At the moment this _exact_ field is required.
    // No other names work.
    private readonly HttpClient _client;
    public Client(HttpClient client) {
        _client = client;
    }
}

Hypothetically this should code gen:

• A strongly typed client based on a the input.
• All models will be placed in the OpenAPI.SourceGenerator.Examples namespace.

An example of the files generated can be found in the example project generated files directory.

Currently untested features:

• GET endpoints
• Delete endpoints
• some level of automated summary tags

TODO:

• POST/PATCH/PUT endpoints
• Handle nullable vs non-nullable projects
• Somehow write tests...
• Find some way to handle naming of functions/properties to be more in line with C# standards.
• Maybe allow some way for users to override
• CI
• Allow models to be either classes or records
• Fix complier warnings.
• Ensure if this breaks, so does things that depend on it.
• Find some way of dealing with incomplete OpenApi docs.
• I would kind of love the idea of allowing for remote pulling of OpenAPI docs as well as on disk...