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connector.rs
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connector.rs
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use std::{
collections::VecDeque,
future::Future,
io,
net::{IpAddr, SocketAddr, SocketAddrV4, SocketAddrV6},
pin::Pin,
task::{Context, Poll},
};
use actix_rt::net::{TcpSocket, TcpStream};
use actix_service::{Service, ServiceFactory};
use futures_core::{future::LocalBoxFuture, ready};
use log::{error, trace};
use tokio_util::sync::ReusableBoxFuture;
use super::connect::{Address, Connect, ConnectAddrs, Connection};
use super::error::ConnectError;
/// TCP connector service factory
#[derive(Debug, Copy, Clone)]
pub struct TcpConnectorFactory;
impl TcpConnectorFactory {
/// Create TCP connector service
pub fn service(&self) -> TcpConnector {
TcpConnector
}
}
impl<T: Address> ServiceFactory<Connect<T>> for TcpConnectorFactory {
type Response = Connection<T, TcpStream>;
type Error = ConnectError;
type Config = ();
type Service = TcpConnector;
type InitError = ();
type Future = LocalBoxFuture<'static, Result<Self::Service, Self::InitError>>;
fn new_service(&self, _: ()) -> Self::Future {
let service = self.service();
Box::pin(async move { Ok(service) })
}
}
/// TCP connector service
#[derive(Debug, Copy, Clone)]
pub struct TcpConnector;
impl<T: Address> Service<Connect<T>> for TcpConnector {
type Response = Connection<T, TcpStream>;
type Error = ConnectError;
type Future = TcpConnectorResponse<T>;
actix_service::always_ready!();
fn call(&self, req: Connect<T>) -> Self::Future {
let port = req.port();
let Connect {
req,
addr,
local_addr,
..
} = req;
TcpConnectorResponse::new(req, port, local_addr, addr)
}
}
/// TCP stream connector response future
pub enum TcpConnectorResponse<T> {
Response {
req: Option<T>,
port: u16,
local_addr: Option<IpAddr>,
addrs: Option<VecDeque<SocketAddr>>,
stream: ReusableBoxFuture<Result<TcpStream, io::Error>>,
},
Error(Option<ConnectError>),
}
impl<T: Address> TcpConnectorResponse<T> {
pub(crate) fn new(
req: T,
port: u16,
local_addr: Option<IpAddr>,
addr: ConnectAddrs,
) -> TcpConnectorResponse<T> {
if addr.is_none() {
error!("TCP connector: unresolved connection address");
return TcpConnectorResponse::Error(Some(ConnectError::Unresolved));
}
trace!(
"TCP connector: connecting to {} on port {}",
req.hostname(),
port
);
match addr {
ConnectAddrs::None => unreachable!("none variant already checked"),
ConnectAddrs::One(addr) => TcpConnectorResponse::Response {
req: Some(req),
port,
local_addr,
addrs: None,
stream: ReusableBoxFuture::new(connect(addr, local_addr)),
},
// when resolver returns multiple socket addr for request they would be popped from
// front end of queue and returns with the first successful tcp connection.
ConnectAddrs::Multi(mut addrs) => {
let addr = addrs.pop_front().unwrap();
TcpConnectorResponse::Response {
req: Some(req),
port,
local_addr,
addrs: Some(addrs),
stream: ReusableBoxFuture::new(connect(addr, local_addr)),
}
}
}
}
}
impl<T: Address> Future for TcpConnectorResponse<T> {
type Output = Result<Connection<T, TcpStream>, ConnectError>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
match self.get_mut() {
TcpConnectorResponse::Error(err) => Poll::Ready(Err(err.take().unwrap())),
TcpConnectorResponse::Response {
req,
port,
local_addr,
addrs,
stream,
} => loop {
match ready!(stream.poll(cx)) {
Ok(sock) => {
let req = req.take().unwrap();
trace!(
"TCP connector: successfully connected to {:?} - {:?}",
req.hostname(),
sock.peer_addr()
);
return Poll::Ready(Ok(Connection::new(sock, req)));
}
Err(err) => {
trace!(
"TCP connector: failed to connect to {:?} port: {}",
req.as_ref().unwrap().hostname(),
port,
);
if let Some(addr) = addrs.as_mut().and_then(|addrs| addrs.pop_front()) {
stream.set(connect(addr, *local_addr));
} else {
return Poll::Ready(Err(ConnectError::Io(err)));
}
}
}
},
}
}
}
async fn connect(addr: SocketAddr, local_addr: Option<IpAddr>) -> io::Result<TcpStream> {
// use local addr if connect asks for it.
match local_addr {
Some(ip_addr) => {
let socket = match ip_addr {
IpAddr::V4(ip_addr) => {
let socket = TcpSocket::new_v4()?;
let addr = SocketAddr::V4(SocketAddrV4::new(ip_addr, 0));
socket.bind(addr)?;
socket
}
IpAddr::V6(ip_addr) => {
let socket = TcpSocket::new_v6()?;
let addr = SocketAddr::V6(SocketAddrV6::new(ip_addr, 0, 0, 0));
socket.bind(addr)?;
socket
}
};
socket.connect(addr).await
}
None => TcpStream::connect(addr).await,
}
}