ruwebframe 0.1.10

use std::future::{ready, Ready};
use actix_web::{
    dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
    Error,
};
use futures_util::future::LocalBoxFuture;

// 1. 中间件结构体
pub struct RuMiddle;

// 2. 实现 Transform
impl<S, B> Transform<S, ServiceRequest> for RuMiddle
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
    S::Future: 'static,
    B: 'static,
{
    type Response = ServiceResponse<B>;
    type Error = Error;
    type InitError = ();
    type Transform = RuMiddleImpl<S>;
    type Future = Ready<Result<Self::Transform, Self::InitError>>;

    fn new_transform(&self, service: S) -> Self::Future {
        ready(Ok(RuMiddleImpl { service }))
    }
}

// 3. 中间件服务
pub struct RuMiddleImpl<S> {
    service: S,
}

// 4. 实现 Service
impl<S, B> Service<ServiceRequest> for RuMiddleImpl<S>
where
    S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
    S::Future: 'static,
    B: 'static,
{
    type Response = ServiceResponse<B>;
    type Error = Error;
    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;

    forward_ready!(service);

    fn call(&self, req: ServiceRequest) -> Self::Future {
        println!("→ 请求到达: {}", req.path());
        let fut = self.service.call(req);

        Box::pin(async move {
            let res = fut.await?;
            println!("← 响应返回: {}", res.status());
            Ok(res)
        })
    }
}