Crate rocket_codegen

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§Rocket - Code Generation

This crate implements the code generation portions of Rocket. This includes custom derives, custom attributes, and procedural macros. The documentation here is purely technical. The code generation facilities are documented thoroughly in the Rocket programming guide.

§Usage

You should not directly depend on this library. To use the macros, attributes, and derives in this crate, it suffices to depend on rocket in Cargo.toml:

[dependencies]
rocket = "0.5.1"

And to import all macros, attributes, and derives via #[macro_use] in the crate root:

#[macro_use] extern crate rocket;

Or, alternatively, selectively import from the top-level scope:


use rocket::{get, routes};

§Debugging Codegen

When the ROCKET_CODEGEN_DEBUG environment variable is set, this crate logs, at compile-time and to the console, the items it generates. For example, you might run the following to build a Rocket application with codegen debug logging enabled:

ROCKET_CODEGEN_DEBUG=1 cargo build

Macros§

  • catchers
    Generates a Vec of Catchers from a set of catcher paths.
  • routes
    Generates a Vec of Routes from a set of route paths.
  • uri
    Type-safe, encoding-safe route and non-route URI generation.

Attribute Macros§

  • async_test
    Retrofits supports for async fn in unit tests.
  • catch
    Attribute to generate a Catcher and associated metadata.
  • delete
    Attribute to generate a Route and associated metadata.
  • get
    Attribute to generate a Route and associated metadata.
  • head
    Attribute to generate a Route and associated metadata.
  • launch
    Generates a main function that launches a returned Rocket<Build>.
  • main
    Retrofits async fn support in main functions.
  • options
    Attribute to generate a Route and associated metadata.
  • patch
    Attribute to generate a Route and associated metadata.
  • post
    Attribute to generate a Route and associated metadata.
  • put
    Attribute to generate a Route and associated metadata.
  • route
    Attribute to generate a Route and associated metadata.

Derive Macros§