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Merge pull request #295 from stjepang/cleanup-tosocketaddrs
Cleanup ToSocketAddrs, add more net reexports
2 parents 41bf106 + c890de2 commit 9c32133

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2 files changed

+150
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‎src/net/addr.rs‎

Lines changed: 145 additions & 45 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
use std::marker::PhantomData;
1+
use std::mem;
22
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
33
use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
44
use std::pin::Pin;
@@ -12,24 +12,37 @@ use crate::task::{blocking, Context, JoinHandle, Poll};
1212
cfg_if! {
1313
if #[cfg(feature = "docs")] {
1414
#[doc(hidden)]
15-
pub struct ImplFuture<'a, T>(std::marker::PhantomData<&'a T>);
15+
pub struct ImplFuture<T>(std::marker::PhantomData<T>);
1616

1717
macro_rules! ret {
18-
($a:lifetime, $f:tt, $i:ty) => (ImplFuture<$a, io::Result<$i>>);
18+
(impl Future<Output = $out:ty>, $fut:ty) => (ImplFuture<$out>);
1919
}
2020
} else {
2121
macro_rules! ret {
22-
($a:lifetime, $f:tt, $i:ty) => ($f<$a, $i>);
22+
(impl Future<Output = $out:ty>, $fut:ty) => ($fut);
2323
}
2424
}
2525
}
2626

27-
/// A trait for objects which can be converted or resolved to one or more [`SocketAddr`] values.
27+
/// Converts or resolves addresses to [`SocketAddr`] values.
2828
///
2929
/// This trait is an async version of [`std::net::ToSocketAddrs`].
3030
///
3131
/// [`std::net::ToSocketAddrs`]: https://doc.rust-lang.org/std/net/trait.ToSocketAddrs.html
32-
/// [`SocketAddr`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html
32+
/// [`SocketAddr`]: enum.SocketAddr.html
33+
///
34+
/// # Examples
35+
///
36+
/// ```
37+
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
38+
/// #
39+
/// use async_std::net::ToSocketAddrs;
40+
///
41+
/// let addr = "localhost:8080".to_socket_addrs().await?.next().unwrap();
42+
/// println!("resolved: {:?}", addr);
43+
/// #
44+
/// # Ok(()) }) }
45+
/// ```
3346
pub trait ToSocketAddrs {
3447
/// Returned iterator over socket addresses which this type may correspond to.
3548
type Iter: Iterator<Item = SocketAddr>;
@@ -40,124 +53,211 @@ pub trait ToSocketAddrs {
4053
/// resolution performed.
4154
///
4255
/// Note that this function may block a backend thread while resolution is performed.
43-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter);
56+
fn to_socket_addrs(
57+
&self,
58+
) -> ret!(
59+
impl Future<Output = Self::Iter>,
60+
ToSocketAddrsFuture<Self::Iter>
61+
);
4462
}
4563

4664
#[doc(hidden)]
4765
#[allow(missing_debug_implementations)]
48-
pub enum ToSocketAddrsFuture<'a, I> {
49-
Phantom(PhantomData<&'a ()>),
50-
Join(JoinHandle<io::Result<I>>),
51-
Ready(Option<io::Result<I>>),
66+
pub enum ToSocketAddrsFuture<I> {
67+
Resolving(JoinHandle<io::Result<I>>),
68+
Ready(io::Result<I>),
69+
Done,
5270
}
5371

54-
impl<I: Iterator<Item = SocketAddr>> Future for ToSocketAddrsFuture<'_, I> {
72+
impl<I: Iterator<Item = SocketAddr>> Future for ToSocketAddrsFuture<I> {
5573
type Output = io::Result<I>;
5674

5775
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
58-
match unsafe { self.get_unchecked_mut() } {
59-
ToSocketAddrsFuture::Join(f) => Pin::new(&mut *f).poll(cx),
60-
ToSocketAddrsFuture::Ready(res) => {
61-
let res = res.take().expect("polled a completed future");
62-
Poll::Ready(res)
76+
let this = unsafe { self.get_unchecked_mut() };
77+
let state = mem::replace(this, ToSocketAddrsFuture::Done);
78+
79+
match state {
80+
ToSocketAddrsFuture::Resolving(mut task) => {
81+
let poll = Pin::new(&mut task).poll(cx);
82+
if poll.is_pending() {
83+
*this = ToSocketAddrsFuture::Resolving(task);
84+
}
85+
poll
6386
}
64-
_ => unreachable!(),
87+
ToSocketAddrsFuture::Ready(res) => Poll::Ready(res),
88+
ToSocketAddrsFuture::Done => panic!("polled a completed future"),
6589
}
6690
}
6791
}
6892

6993
impl ToSocketAddrs for SocketAddr {
7094
type Iter = std::option::IntoIter<SocketAddr>;
7195

72-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
73-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
96+
fn to_socket_addrs(
97+
&self,
98+
) -> ret!(
99+
impl Future<Output = Self::Iter>,
100+
ToSocketAddrsFuture<Self::Iter>
101+
) {
102+
ToSocketAddrsFuture::Ready(Ok(Some(*self).into_iter()))
74103
}
75104
}
76105

77106
impl ToSocketAddrs for SocketAddrV4 {
78107
type Iter = std::option::IntoIter<SocketAddr>;
79108

80-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
81-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
109+
fn to_socket_addrs(
110+
&self,
111+
) -> ret!(
112+
impl Future<Output = Self::Iter>,
113+
ToSocketAddrsFuture<Self::Iter>
114+
) {
115+
SocketAddr::V4(*self).to_socket_addrs()
82116
}
83117
}
84118

85119
impl ToSocketAddrs for SocketAddrV6 {
86120
type Iter = std::option::IntoIter<SocketAddr>;
87121

88-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
89-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
122+
fn to_socket_addrs(
123+
&self,
124+
) -> ret!(
125+
impl Future<Output = Self::Iter>,
126+
ToSocketAddrsFuture<Self::Iter>
127+
) {
128+
SocketAddr::V6(*self).to_socket_addrs()
90129
}
91130
}
92131

93132
impl ToSocketAddrs for (IpAddr, u16) {
94133
type Iter = std::option::IntoIter<SocketAddr>;
95134

96-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
97-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
135+
fn to_socket_addrs(
136+
&self,
137+
) -> ret!(
138+
impl Future<Output = Self::Iter>,
139+
ToSocketAddrsFuture<Self::Iter>
140+
) {
141+
let (ip, port) = *self;
142+
match ip {
143+
IpAddr::V4(a) => (a, port).to_socket_addrs(),
144+
IpAddr::V6(a) => (a, port).to_socket_addrs(),
145+
}
98146
}
99147
}
100148

101149
impl ToSocketAddrs for (Ipv4Addr, u16) {
102150
type Iter = std::option::IntoIter<SocketAddr>;
103151

104-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
105-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
152+
fn to_socket_addrs(
153+
&self,
154+
) -> ret!(
155+
impl Future<Output = Self::Iter>,
156+
ToSocketAddrsFuture<Self::Iter>
157+
) {
158+
let (ip, port) = *self;
159+
SocketAddrV4::new(ip, port).to_socket_addrs()
106160
}
107161
}
108162

109163
impl ToSocketAddrs for (Ipv6Addr, u16) {
110164
type Iter = std::option::IntoIter<SocketAddr>;
111165

112-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
113-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
166+
fn to_socket_addrs(
167+
&self,
168+
) -> ret!(
169+
impl Future<Output = Self::Iter>,
170+
ToSocketAddrsFuture<Self::Iter>
171+
) {
172+
let (ip, port) = *self;
173+
SocketAddrV6::new(ip, port, 0, 0).to_socket_addrs()
114174
}
115175
}
116176

117177
impl ToSocketAddrs for (&str, u16) {
118178
type Iter = std::vec::IntoIter<SocketAddr>;
119179

120-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
121-
let host = self.0.to_string();
122-
let port = self.1;
123-
let join = blocking::spawn(async move {
180+
fn to_socket_addrs(
181+
&self,
182+
) -> ret!(
183+
impl Future<Output = Self::Iter>,
184+
ToSocketAddrsFuture<Self::Iter>
185+
) {
186+
let (host, port) = *self;
187+
188+
if let Ok(addr) = host.parse::<Ipv4Addr>() {
189+
let addr = SocketAddrV4::new(addr, port);
190+
return ToSocketAddrsFuture::Ready(Ok(vec![SocketAddr::V4(addr)].into_iter()));
191+
}
192+
193+
if let Ok(addr) = host.parse::<Ipv6Addr>() {
194+
let addr = SocketAddrV6::new(addr, port, 0, 0);
195+
return ToSocketAddrsFuture::Ready(Ok(vec![SocketAddr::V6(addr)].into_iter()));
196+
}
197+
198+
let host = host.to_string();
199+
let task = blocking::spawn(async move {
124200
std::net::ToSocketAddrs::to_socket_addrs(&(host.as_str(), port))
125201
});
126-
ToSocketAddrsFuture::Join(join)
202+
ToSocketAddrsFuture::Resolving(task)
127203
}
128204
}
129205

130206
impl ToSocketAddrs for str {
131207
type Iter = std::vec::IntoIter<SocketAddr>;
132208

133-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
134-
let socket_addrs = self.to_string();
135-
let join =
136-
blocking::spawn(async move { std::net::ToSocketAddrs::to_socket_addrs(&socket_addrs) });
137-
ToSocketAddrsFuture::Join(join)
209+
fn to_socket_addrs(
210+
&self,
211+
) -> ret!(
212+
impl Future<Output = Self::Iter>,
213+
ToSocketAddrsFuture<Self::Iter>
214+
) {
215+
if let Some(addr) = self.parse().ok() {
216+
return ToSocketAddrsFuture::Ready(Ok(vec![addr].into_iter()));
217+
}
218+
219+
let addr = self.to_string();
220+
let task =
221+
blocking::spawn(async move { std::net::ToSocketAddrs::to_socket_addrs(addr.as_str()) });
222+
ToSocketAddrsFuture::Resolving(task)
138223
}
139224
}
140225

141226
impl<'a> ToSocketAddrs for &'a [SocketAddr] {
142227
type Iter = std::iter::Cloned<std::slice::Iter<'a, SocketAddr>>;
143228

144-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
145-
ToSocketAddrsFuture::Ready(Some(std::net::ToSocketAddrs::to_socket_addrs(self)))
229+
fn to_socket_addrs(
230+
&self,
231+
) -> ret!(
232+
impl Future<Output = Self::Iter>,
233+
ToSocketAddrsFuture<Self::Iter>
234+
) {
235+
ToSocketAddrsFuture::Ready(Ok(self.iter().cloned()))
146236
}
147237
}
148238

149239
impl<T: ToSocketAddrs + ?Sized> ToSocketAddrs for &T {
150240
type Iter = T::Iter;
151241

152-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
242+
fn to_socket_addrs(
243+
&self,
244+
) -> ret!(
245+
impl Future<Output = Self::Iter>,
246+
ToSocketAddrsFuture<Self::Iter>
247+
) {
153248
(**self).to_socket_addrs()
154249
}
155250
}
156251

157252
impl ToSocketAddrs for String {
158253
type Iter = std::vec::IntoIter<SocketAddr>;
159254

160-
fn to_socket_addrs(&self) -> ret!('_, ToSocketAddrsFuture, Self::Iter) {
161-
ToSocketAddrs::to_socket_addrs(self.as_str())
255+
fn to_socket_addrs(
256+
&self,
257+
) -> ret!(
258+
impl Future<Output = Self::Iter>,
259+
ToSocketAddrsFuture<Self::Iter>
260+
) {
261+
(&**self).to_socket_addrs()
162262
}
163263
}

‎src/net/mod.rs‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -28,6 +28,11 @@
2828
//! # }) }
2929
//! ```
3030
31+
pub use std::net::AddrParseError;
32+
pub use std::net::Shutdown;
33+
pub use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
34+
pub use std::net::{SocketAddr, SocketAddrV4, SocketAddrV6};
35+
3136
pub use addr::ToSocketAddrs;
3237
pub use tcp::{Incoming, TcpListener, TcpStream};
3338
pub use udp::UdpSocket;

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