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use actix_service::{Service, Transform};
use actix_web::error::ErrorBadRequest;
use actix_web::http::header::{HeaderName, HeaderValue};
use actix_web::Result;
use actix_web::{dev, Error, FromRequest, HttpMessage, HttpRequest};
use actix_web::{dev::ServiceRequest, dev::ServiceResponse};
use futures::future::{err, ok, Ready};
use std::task::{Context, Poll};
pub const REQUEST_ID_HEADER: &str = "x-request-id";
pub struct RequestIDWrapper;
impl<S, B> Transform<S> for RequestIDWrapper
where
S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
S::Future: 'static,
B: 'static,
{
type Request = ServiceRequest;
type Response = ServiceResponse<B>;
type Error = Error;
type InitError = ();
type Transform = RequestIDMiddleware<S>;
type Future = Ready<Result<Self::Transform, Self::InitError>>;
fn new_transform(&self, service: S) -> Self::Future {
ok(RequestIDMiddleware { service })
}
}
pub struct RequestIDMiddleware<S> {
service: S,
}
impl<S, B> Service for RequestIDMiddleware<S>
where
S: Service<Request = ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
S::Future: 'static,
B: 'static,
{
type Request = ServiceRequest;
type Response = ServiceResponse<B>;
type Error = Error;
type Future = S::Future;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.service.poll_ready(cx)
}
fn call(&mut self, req: ServiceRequest) -> Self::Future {
use rand::{distributions::Alphanumeric, thread_rng, Rng};
let request_id: String = thread_rng().sample_iter(&Alphanumeric).take(10).collect();
let mut req = req;
req.headers_mut().append(
HeaderName::from_static(REQUEST_ID_HEADER),
HeaderValue::from_str(&request_id).unwrap(),
);
req.extensions_mut().insert(RequestID(request_id));
self.service.call(req)
}
}
pub struct RequestID(pub String);
impl FromRequest for RequestID {
type Error = Error;
type Future = Ready<Result<Self, Self::Error>>;
type Config = ();
fn from_request(req: &HttpRequest, _payload: &mut dev::Payload) -> Self::Future {
if let Some(RequestID(req_id)) = req.extensions().get::<RequestID>() {
ok(RequestID(req_id.clone()))
} else {
err(ErrorBadRequest("request id is missing"))
}
}
}