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use core::task;
use hyper::client::connect::dns::Name;
use std::future::Future;
use std::net::SocketAddr;
use std::task::Poll;
use tower_service::Service;
// Trait from hyper to implement DNS resolution for HTTP/3 client.
pub trait Resolve {
type Addrs: Iterator<Item = SocketAddr>;
type Error: Into<Box<dyn std::error::Error + Send + Sync>>;
type Future: Future<Output = Result<Self::Addrs, Self::Error>>;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>>;
fn resolve(&mut self, name: Name) -> Self::Future;
}
impl<S> Resolve for S
where
S: Service<Name>,
S::Response: Iterator<Item = SocketAddr>,
S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
{
type Addrs = S::Response;
type Error = S::Error;
type Future = S::Future;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
Service::poll_ready(self, cx)
}
fn resolve(&mut self, name: Name) -> Self::Future {
Service::call(self, name)
}
}
pub(super) async fn resolve<R>(resolver: &mut R, name: Name) -> Result<R::Addrs, R::Error>
where
R: Resolve,
{
futures_util::future::poll_fn(|cx| resolver.poll_ready(cx)).await?;
resolver.resolve(name).await
}
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