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use std::{
pin::Pin,
task::{Context, Poll},
};
use axum::{
extract::{FromRef, Request},
http::StatusCode,
response::{IntoResponse, Response},
};
use tower::{Layer, Service};
use crate::{error::Internal, setup::app::Setup};
#[derive(Clone)]
pub struct Required<App>(pub App);
impl<App> Required<App> {
pub fn with_fallback<F>(self, fallback: F) -> WithFallback<App, F> {
let Self(app) = self;
WithFallback { app, fallback }
}
}
impl<S, App> Layer<S> for Required<App>
where
Self: Clone,
{
type Service = Middleware<S, App, Unavailable>;
fn layer(&self, inner: S) -> Self::Service {
let Self(app) = self.clone();
Middleware {
inner,
app,
fallback: Unavailable,
}
}
}
#[derive(Clone)]
pub struct WithFallback<App, F> {
app: App,
fallback: F,
}
impl<S, App, F> Layer<S> for WithFallback<App, F>
where
Self: Clone,
{
type Service = Middleware<S, App, F>;
fn layer(&self, inner: S) -> Self::Service {
let Self { app, fallback } = self.clone();
Middleware {
inner,
app,
fallback,
}
}
}
#[derive(Clone)]
pub struct Middleware<S, App, F> {
inner: S,
app: App,
fallback: F,
}
impl<S, App, F> Service<Request> for Middleware<S, App, F>
where
Setup: FromRef<App>,
Self: Clone,
S: Service<Request, Response = Response> + Send + 'static,
S::Future: Send,
App: Send + 'static,
F: IntoResponse + Clone + Send + 'static,
{
type Response = S::Response;
type Error = S::Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.inner.poll_ready(ctx)
}
fn call(&mut self, req: Request) -> Self::Future {
let Self {
mut inner,
app,
fallback,
} = self.clone();
Box::pin(async move {
match Setup::from_ref(&app).completed().await {
Ok(true) => inner.call(req).await,
Ok(false) => Ok(fallback.into_response()),
Err(error) => Ok(Internal::from(error).into_response()),
}
})
}
}
#[derive(Clone)]
pub struct Unavailable;
impl IntoResponse for Unavailable {
fn into_response(self) -> Response {
(
StatusCode::SERVICE_UNAVAILABLE,
"initial setup not completed",
)
.into_response()
}
}
|
