actix-responder-macro

An attribute macro to transform a handler response struct to an actix responder. Keeps flexibility while adding more type safety.

The actix_responder adds 2 additional fields to your struct content_type and status_code. The meta_attr allows for arbitrary attributes to both fields.

status_attr applies only to status_code and content_attr applies only to content_type

The reason for this is like in the example below, if you use a crate like TypedBuilder, you might want to apply options like #[builder(default)] to the generated field.

The macro always applies #[serde(skip)] to both generated fields so they won't show up in the request response.

#[actix_responder(meta_attr = "builder(default)")]
#[derive(TypedBuilder, Serialize, Deserialize)]
pub struct SuccessResp {
    success: bool,
}

From this

#[get("/health_check")]
pub async fn health_check() -> impl Responder {
    HttpResponse::Ok()
    .set_header(header::CONTENT_TYPE, mime::APPLICATION_JSON)
    .json(SuccessResp { success: true })
}

to this

#[get("/health_check")]
pub async fn health_check() -> SuccessResp {
    SuccessResp::builder()
    .success(true)
    .content_type(mime::APPLICATION_JSON::to_string())
    .build()
}

A more complicated example with setting default values

extern crate actix_responder_macro;
extern crate mime;
extern crate typed_builder;

use actix_responder_macro::actix_responder;
use actix_web::http::StatusCode;
use serde::{Deserialize, Serialize};
use typed_builder::TypedBuilder;

#[actix_responder(
    status_attr = "builder(default = StatusCode::INTERNAL_SERVER_ERROR)",
    content_attr = "builder(default = mime::IMAGE_BMP.to_string())"
)]
#[derive(Serialize, Deserialize, Debug, TypedBuilder, Default)]
pub struct ImageResp {...}