Implement Fluent Method Chaining for Status and Type Methods Using Generics

[coderabbitai]

We propose implementing the fluent concept for the methods Status and Type in the Fiber framework using generics, as discussed in the following articles:

• Generic Interface Functions in Go
• Go Generics Playground Example
• Self-Referencing Interfaces in Golang 1.18

Background:

Using generics allows for method chaining by having methods return a generic interface type, similar to the self keyword in other languages. Since Go does not have a self keyword, generics provide a feasible alternative without significant language changes.

Proposal:

• Modify the Context Interface:

• Change methods like Status and Type to return a generic interface instead of a concrete type.

• This enables fluent method chaining while maintaining type safety and flexibility.

• Implement a Generic Ctx Interface on App:

  • To prevent class switching when registering a custom context that uses fluent methods, implement a generic interface for Ctx on the App.

• Provide Multiple New Methods:

  • Offer additional constructor methods so developers who do not need a custom context can continue using fiber.New without any changes.
  • Provide alternative constructors for those who wish to customize the context.

Benefits:

• Maintains ease of use for existing users.
• Enhances flexibility for developers requiring custom contexts.
• Utilizes Go's generics feature introduced in 1.18 for improved design patterns.

References:

• Original PR: gofiber/contrib#1202
• Related Discussion: Comment in PR

Requested by: @ReneWerner87