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service.rs
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service.rs
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use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use actix_rt::net::TcpStream;
use actix_service::{Service, ServiceFactory};
use futures_core::{future::LocalBoxFuture, ready};
use super::connect::{Address, Connect, Connection};
use super::connector::{TcpConnector, TcpConnectorFactory};
use super::error::ConnectError;
use super::resolve::{Resolver, ResolverFactory};
pub struct ConnectServiceFactory {
tcp: TcpConnectorFactory,
resolver: ResolverFactory,
}
impl ConnectServiceFactory {
/// Construct new ConnectService factory
pub fn new(resolver: Resolver) -> Self {
ConnectServiceFactory {
tcp: TcpConnectorFactory,
resolver: ResolverFactory::new(resolver),
}
}
/// Construct new service
pub fn service(&self) -> ConnectService {
ConnectService {
tcp: self.tcp.service(),
resolver: self.resolver.service(),
}
}
}
impl Clone for ConnectServiceFactory {
fn clone(&self) -> Self {
ConnectServiceFactory {
tcp: self.tcp,
resolver: self.resolver.clone(),
}
}
}
impl<T: Address> ServiceFactory<Connect<T>> for ConnectServiceFactory {
type Response = Connection<T, TcpStream>;
type Error = ConnectError;
type Config = ();
type Service = ConnectService;
type InitError = ();
type Future = LocalBoxFuture<'static, Result<Self::Service, Self::InitError>>;
fn new_service(&self, _: ()) -> Self::Future {
let service = self.service();
Box::pin(async { Ok(service) })
}
}
#[derive(Clone)]
pub struct ConnectService {
tcp: TcpConnector,
resolver: Resolver,
}
impl<T: Address> Service<Connect<T>> for ConnectService {
type Response = Connection<T, TcpStream>;
type Error = ConnectError;
type Future = ConnectServiceResponse<T>;
actix_service::always_ready!();
fn call(&self, req: Connect<T>) -> Self::Future {
ConnectServiceResponse {
fut: ConnectFuture::Resolve(self.resolver.call(req)),
tcp: self.tcp,
}
}
}
// helper enum to generic over futures of resolve and connect phase.
pub(crate) enum ConnectFuture<T: Address> {
Resolve(<Resolver as Service<Connect<T>>>::Future),
Connect(<TcpConnector as Service<Connect<T>>>::Future),
}
// helper enum to contain the future output of ConnectFuture
pub(crate) enum ConnectOutput<T: Address> {
Resolved(Connect<T>),
Connected(Connection<T, TcpStream>),
}
impl<T: Address> ConnectFuture<T> {
fn poll_connect(
&mut self,
cx: &mut Context<'_>,
) -> Poll<Result<ConnectOutput<T>, ConnectError>> {
match self {
ConnectFuture::Resolve(ref mut fut) => {
Pin::new(fut).poll(cx).map_ok(ConnectOutput::Resolved)
}
ConnectFuture::Connect(ref mut fut) => {
Pin::new(fut).poll(cx).map_ok(ConnectOutput::Connected)
}
}
}
}
pub struct ConnectServiceResponse<T: Address> {
fut: ConnectFuture<T>,
tcp: TcpConnector,
}
impl<T: Address> Future for ConnectServiceResponse<T> {
type Output = Result<Connection<T, TcpStream>, ConnectError>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
loop {
match ready!(self.fut.poll_connect(cx))? {
ConnectOutput::Resolved(res) => {
self.fut = ConnectFuture::Connect(self.tcp.call(res));
}
ConnectOutput::Connected(res) => return Poll::Ready(Ok(res)),
}
}
}
}