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denoland-deno/cli/resolve_addr.rs

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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
use deno::ErrBox;
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use std::future::Future;
use std::net::SocketAddr;
use std::net::ToSocketAddrs;
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use std::pin::Pin;
use std::task::Context;
use std::task::Poll;
/// Resolve network address. Returns a future.
pub fn resolve_addr(hostname: &str, port: u16) -> ResolveAddrFuture {
ResolveAddrFuture {
hostname: hostname.to_string(),
port,
}
}
pub struct ResolveAddrFuture {
hostname: String,
port: u16,
}
impl Future for ResolveAddrFuture {
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type Output = Result<SocketAddr, ErrBox>;
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fn poll(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Self::Output> {
let inner = self.get_mut();
// The implementation of this is not actually async at the moment,
// however we intend to use async DNS resolution in the future and
// so we expose this as a future instead of Result.
// Default to localhost if given just the port. Example: ":80"
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let addr: &str = if !inner.hostname.is_empty() {
&inner.hostname
} else {
"0.0.0.0"
};
// If this looks like an ipv6 IP address. Example: "[2001:db8::1]"
// Then we remove the brackets.
let addr = if addr.starts_with('[') && addr.ends_with(']') {
let l = addr.len() - 1;
addr.get(1..l).unwrap()
} else {
addr
};
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let addr_port_pair = (addr, inner.port);
let r = addr_port_pair.to_socket_addrs().map_err(ErrBox::from);
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Poll::Ready(r.and_then(|mut iter| match iter.next() {
Some(a) => Ok(a),
None => panic!("There should be at least one result"),
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}))
}
}
#[cfg(test)]
mod tests {
use super::*;
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use futures::executor::block_on;
use std::net::Ipv4Addr;
use std::net::Ipv6Addr;
use std::net::SocketAddrV4;
use std::net::SocketAddrV6;
#[test]
fn resolve_addr1() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 80));
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let actual = block_on(resolve_addr("127.0.0.1", 80)).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr2() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(0, 0, 0, 0), 80));
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let actual = block_on(resolve_addr("", 80)).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr3() {
let expected =
SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(192, 0, 2, 1), 25));
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let actual = block_on(resolve_addr("192.0.2.1", 25)).unwrap();
assert_eq!(actual, expected);
}
#[test]
fn resolve_addr_ipv6() {
let expected = SocketAddr::V6(SocketAddrV6::new(
Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1),
8080,
0,
0,
));
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let actual = block_on(resolve_addr("[2001:db8::1]", 8080)).unwrap();
assert_eq!(actual, expected);
}
}