routes macro allowing multiple paths per handler (#2718)

* WIP: basic implementation for `routes` macro

* chore: changelog, docs, tests

* error on missing methods

* Apply suggestions from code review

Co-authored-by: Igor Aleksanov <popzxc@yandex.ru>

* update test stderr expectation

* add additional tests

* fix stderr output

* remove useless ResourceType

this is dead code from back when .to and .to_async were different ways to add a service

Co-authored-by: Igor Aleksanov <popzxc@yandex.ru>
Co-authored-by: Rob Ede <robjtede@icloud.com>

actix-web-codegen/CHANGES.md

@@ -1,8 +1,11 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- Add `#[routes]` macro to support multiple paths for one handler. [#2718]
 - Minimum supported Rust version (MSRV) is now 1.57 due to transitive `time` dependency.
 
+[#2718]: https://github.com/actix/actix-web/pull/2718
+
 
 ## 4.0.1 - 2022-06-11
 - Fix support for guard paths in route handler macros. [#2771]

actix-web-codegen/Cargo.toml

@@ -18,7 +18,7 @@ proc-macro = true
 actix-router = "0.5.0"
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "1", features = ["full", "parsing"] }
+syn = { version = "1", features = ["full", "extra-traits"] }
 
 [dev-dependencies]
 actix-macros = "0.2.3"

actix-web-codegen/src/lib.rs

@@ -46,9 +46,20 @@
 //! ```
 //!
 //! # Multiple Path Handlers
-//! There are no macros to generate multi-path handlers. Let us know in [this issue].
+//! Acts as a wrapper for multiple single method handler macros. It takes no arguments and
+//! delegates those to the macros for the individual methods. See [macro@routes] macro docs.
 //!
-//! [this issue]: https://github.com/actix/actix-web/issues/1709
+//! ```
+//! # use actix_web::HttpResponse;
+//! # use actix_web_codegen::routes;
+//! #[routes]
+//! #[get("/test")]
+//! #[get("/test2")]
+//! #[delete("/test")]
+//! async fn example() -> HttpResponse {
+//!     HttpResponse::Ok().finish()
+//! }
+//! ```
 //!
 //! [actix-web attributes docs]: https://docs.rs/actix-web/latest/actix_web/#attributes
 //! [GET]: macro@get
@@ -104,6 +115,39 @@ pub fn route(args: TokenStream, input: TokenStream) -> TokenStream {
     route::with_method(None, args, input)
 }
 
+/// Creates resource handler, allowing multiple HTTP methods and paths.
+///
+/// # Syntax
+/// ```plain
+/// #[routes]
+/// #[<method>("path", ...)]
+/// #[<method>("path", ...)]
+/// ...
+/// ```
+///
+/// # Attributes
+/// The `routes` macro itself has no parameters, but allows specifying the attribute macros for
+/// the multiple paths and/or methods, e.g. [`GET`](macro@get) and [`POST`](macro@post).
+///
+/// These helper attributes take the same parameters as the [single method handlers](crate#single-method-handler).
+///
+/// # Examples
+/// ```
+/// # use actix_web::HttpResponse;
+/// # use actix_web_codegen::routes;
+/// #[routes]
+/// #[get("/test")]
+/// #[get("/test2")]
+/// #[delete("/test")]
+/// async fn example() -> HttpResponse {
+///     HttpResponse::Ok().finish()
+/// }
+/// ```
+#[proc_macro_attribute]
+pub fn routes(_: TokenStream, input: TokenStream) -> TokenStream {
+    route::with_methods(input)
+}
+
 macro_rules! method_macro {
     ($variant:ident, $method:ident) => {
 #[doc = concat!("Creates route handler with `actix_web::guard::", stringify!($variant), "`.")]