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use std::fmt;
use std::io::Result as IoResult;
use std::net::{SocketAddr, ToSocketAddrs};
use std::sync::Arc;
pub trait Resolver: Send + Sync {
fn resolve(&self, netloc: &str) -> IoResult<Vec<SocketAddr>>;
}
#[derive(Debug)]
pub(crate) struct StdResolver;
impl Resolver for StdResolver {
fn resolve(&self, netloc: &str) -> IoResult<Vec<SocketAddr>> {
ToSocketAddrs::to_socket_addrs(netloc).map(|iter| iter.collect())
}
}
impl<F> Resolver for F
where
F: Fn(&str) -> IoResult<Vec<SocketAddr>>,
F: Send + Sync,
{
fn resolve(&self, netloc: &str) -> IoResult<Vec<SocketAddr>> {
self(netloc)
}
}
#[derive(Clone)]
pub(crate) struct ArcResolver(Arc<dyn Resolver>);
impl<R> From<R> for ArcResolver
where
R: Resolver + 'static,
{
fn from(r: R) -> Self {
Self(Arc::new(r))
}
}
impl fmt::Debug for ArcResolver {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "ArcResolver(...)")
}
}
impl std::ops::Deref for ArcResolver {
type Target = dyn Resolver;
fn deref(&self) -> &Self::Target {
self.0.as_ref()
}
}