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use std::{io, mem, result};
use std::net::{IpAddr, SocketAddr, ToSocketAddrs};
use std::slice;
use futures::{Async, Future, Poll};
use ::bits::{DName, DNameBuf, DNameSlice, MessageBuf, ParsedDName, ParseResult};
use ::iana::{Rtype, Class};
use ::rdata::{A, Aaaa};
use super::super::{Query, Resolver};
use super::super::error::{Error, Result};
use super::search::SearchIter;
pub fn lookup_host<N>(resolver: Resolver, name: N) -> LookupHost
where N: AsRef<DNameSlice> {
let name = name.as_ref();
let mut search = SearchIter::new(resolver.clone(), name);
let search_name = search.as_mut().map(|s| s.next().unwrap());
let query_name = match search_name {
Some(ref name) => name,
None => name
};
let a = resolver.clone().query((query_name, Rtype::A, Class::In));
let aaaa = resolver.clone().query((query_name, Rtype::Aaaa, Class::In));
LookupHost {
resolver: resolver,
a: MaybeDone::NotYet(a),
aaaa: MaybeDone::NotYet(aaaa),
search: search
}
}
pub struct LookupHost {
resolver: Resolver,
a: MaybeDone<Query>,
aaaa: MaybeDone<Query>,
search: Option<SearchIter>,
}
impl Future for LookupHost {
type Item = FoundHosts;
type Error = Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
if (self.a.poll(), self.aaaa.poll()) != (true, true) {
return Ok(Async::NotReady)
}
let err = match FoundHosts::from_messages(self.a.take(), self.aaaa.take()) {
Ok(some) => return Ok(Async::Ready(some)),
Err(err) => err,
};
let name = match self.search {
None => return Err(err),
Some(ref mut search) => {
match search.next() {
None => return Err(err),
Some(name) => name
}
}
};
self.a = MaybeDone::NotYet(
self.resolver.clone().query((&name, Rtype::A, Class::In)));
self.aaaa = MaybeDone::NotYet(
self.resolver.clone().query((&name, Rtype::Aaaa, Class::In)));
self.poll()
}
}
enum MaybeDone<A: Future> {
NotYet(A),
Item(A::Item),
Error(A::Error),
Gone
}
impl<A: Future> MaybeDone<A> {
fn poll(&mut self) -> bool {
let res = match *self {
MaybeDone::NotYet(ref mut a) => a.poll(),
MaybeDone::Item(_) | MaybeDone::Error(_) => return true,
MaybeDone::Gone => panic!("polling a completed LookupHost"),
};
match res {
Ok(Async::Ready(item)) => {
*self = MaybeDone::Item(item);
true
}
Err(err) => {
*self = MaybeDone::Error(err);
true
}
Ok(Async::NotReady) => {
false
}
}
}
fn take(&mut self) -> result::Result<A::Item, A::Error> {
match mem::replace(self, MaybeDone::Gone) {
MaybeDone::Item(item) => Ok(item),
MaybeDone::Error(err) => Err(err),
_ => panic!(),
}
}
}
#[derive(Clone, Debug)]
pub struct FoundHosts {
canonical: DNameBuf,
addrs: Vec<IpAddr>
}
impl FoundHosts {
pub fn new(canonical: DNameBuf, addrs: Vec<IpAddr>) -> Self {
FoundHosts{canonical: canonical, addrs: addrs}
}
fn from_messages(a: Result<MessageBuf>, b: Result<MessageBuf>) -> Result<Self> {
let (a, b) = match (a, b) {
(Ok(a), b) => (a, b),
(a, Ok(b)) => (b, a),
(Err(a), Err(b)) => return Err(a.merge(b))
};
let name = a.canonical_name().unwrap();
let mut addrs = Vec::new();
Self::process_records(&mut addrs, &a, &name).ok();
if let Ok(b) = b {
Self::process_records(&mut addrs, &b, &name).ok();
}
Ok(FoundHosts{canonical: name.to_cow().into_owned(), addrs: addrs})
}
fn process_records(addrs: &mut Vec<IpAddr>, msg: &MessageBuf,
name: &ParsedDName) -> ParseResult<()> {
for record in try!(msg.answer()).limit_to::<A>() {
if let Ok(record) = record {
if record.name() == name {
addrs.push(IpAddr::V4(record.data().addr()))
}
}
}
for record in try!(msg.answer()).limit_to::<Aaaa>() {
if let Ok(record) = record {
if record.name() == name {
addrs.push(IpAddr::V6(record.data().addr()))
}
}
}
Ok(())
}
pub fn canonical_name(&self) -> &DNameSlice {
&self.canonical
}
pub fn iter(&self) -> FoundHostsIter {
FoundHostsIter(self.addrs.iter())
}
pub fn port_iter(&self, port: u16) -> FoundHostsSocketIter {
FoundHostsSocketIter(self.addrs.iter(), port)
}
}
#[derive(Clone, Debug)]
pub struct FoundHostsIter<'a>(slice::Iter<'a, IpAddr>);
impl<'a> Iterator for FoundHostsIter<'a> {
type Item = IpAddr;
fn next(&mut self) -> Option<IpAddr> {
self.0.next().cloned()
}
}
#[derive(Clone, Debug)]
pub struct FoundHostsSocketIter<'a>(slice::Iter<'a, IpAddr>, u16);
impl<'a> Iterator for FoundHostsSocketIter<'a> {
type Item = SocketAddr;
fn next(&mut self) -> Option<SocketAddr> {
self.0.next().map(|addr| SocketAddr::new(*addr, self.1))
}
}
impl<'a> ToSocketAddrs for FoundHostsSocketIter<'a> {
type Iter = Self;
fn to_socket_addrs(&self) -> io::Result<Self> {
Ok(self.clone())
}
}