[英]Implement actix_web::Responder trait on a custom structure
I'm using actix-web v4.我正在使用 actix-web v4。
I'm trying to implement a web service with a custom structure for handling errors:我正在尝试使用用于处理错误的自定义结构来实现 web 服务:
pub struct ApiError {
pub message: String,
pub code: ErrorEnum,
pub details: Vec<ErrorDetail>,
}
This is an example of function that returns this structure on a failure:这是 function 的示例,它在失败时返回此结构:
pub fn my_func_that_fails() -> Result<(), ApiError> {
Err(ApiError::default())
}
I have this function to map ApiError
s to HttpResponse
s:我有这个 function 到 map
ApiError
s 到HttpResponse
s:
pub fn err_to_http(error: &ApiError) -> actix_web::HttpResponse {
match error.code {
ErrorEnum::NotFound => actix_web::HttpResponse::NotFound()
.content_type("application/json; charset=utf-8")
.json(error),
//...
}
}
This is how I use it in a handler:这就是我在处理程序中使用它的方式:
pub async fn my_handler(req: actix_web::HttpRequest) -> impl actix_web::Responder {
if let Err(e) = my_func_that_fails() {
return err_to_http(&e);
}
}
I would like to be able to use it this way:我希望能够以这种方式使用它:
pub async fn my_handler(req: actix_web::HttpRequest) -> impl actix_web::Responder {
my_func_that_fails()?;
}
For this I need to implement the trait actix_web::Responder
, but I can't find documentation online to do that.为此,我需要实现特征
actix_web::Responder
,但我无法在网上找到文档来执行此操作。 This is my attempt at doing it, but I don't know what to put in the Body
type, nor if I'm doing it correctly:这是我尝试这样做的尝试,但我不知道在
Body
类型中放入什么,也不知道我是否正确地做了:
impl actix_web::Responder for ApiError {
type Body = ???;
fn respond_to(self, req: &actix_web::HttpRequest) -> actix_web::HttpResponse<Self::Body> {
err_to_http(&self.api_error).into_future()
}
}
The following should work:以下应该工作:
impl actix_web::Responder for ApiError {
type Body = actix_web::body::BoxBody;
fn respond_to(self, req: &actix_web::HttpRequest) -> actix_web::HttpResponse<Self::Body> {
err_to_http(&self.api_error)
}
}
Although, this technically isn't accurate because implementing Responder
for ApiError will not solve your problem.虽然,这在技术上并不准确,因为为 ApiError 实施
Responder
不会解决您的问题。 I recommend something like this instead:我推荐这样的东西:
pub async fn my_handler(req: actix_web::HttpRequest) -> Result<actix_web::HttpResponse, ApiError> {
my_func_that_fails()?;
}
and then have ApiError
implement the ResponseError
trait, like so:然后让
ApiError
实现ResponseError
特性,如下所示:
impl actix_web::error::ResponseError for ApiError {
fn error_response(&self) -> actix_web::HttpResponse {
match error.code {
ErrorEnum::NotFound => actix_web::HttpResponse::NotFound()
.content_type("application/json; charset=utf-8")
.json(error),
//...
}
}
fn status_code(&self) -> actix_web::http::StatusCode {
// get status code here
}
}
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