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use std::net::{IpAddr, SocketAddr, AddrParseError};
use std::slice::Iter;
use std::sync::Arc;
use std::iter::FromIterator;
use rand::{thread_rng, Rng};
use addr::Address;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct IpList(Arc<Vec<IpAddr>>);
#[derive(Debug)]
pub struct IpIterator<'a>(Iter<'a, IpAddr>);
impl IpList {
pub fn pick_one(&self) -> Option<IpAddr> {
if self.0.len() == 0 {
return None
}
thread_rng().choose(&self.0[..]).map(|&x| x)
}
pub fn iter(&self) -> IpIterator {
IpIterator(self.0.iter())
}
pub fn with_port(&self, port: u16) -> Address {
self.iter().map(|x| SocketAddr::new(*x, port)).collect()
}
pub fn parse_list<I>(iter: I)
-> Result<IpList, AddrParseError>
where I: IntoIterator,
I::Item: AsRef<str>
{
Ok(IpList(Arc::new(iter.into_iter()
.map(|x| x.as_ref().parse())
.collect::<Result<Vec<_>, _>>()?
)))
}
}
impl<'a> Iterator for IpIterator<'a> {
type Item = &'a IpAddr;
fn next(&mut self) -> Option<&'a IpAddr> {
self.0.next()
}
}
impl<'a> IntoIterator for &'a IpList {
type Item = &'a IpAddr;
type IntoIter = IpIterator<'a>;
fn into_iter(self) -> IpIterator<'a> {
IpIterator(self.0.iter())
}
}
impl From<Vec<IpAddr>> for IpList {
fn from(vec: Vec<IpAddr>) -> IpList {
IpList(Arc::new(vec))
}
}
impl FromIterator<IpAddr> for IpList {
fn from_iter<T>(iter: T) -> IpList
where T: IntoIterator<Item=IpAddr>,
{
IpList(Arc::new(iter.into_iter().collect()))
}
}
#[cfg(test)]
mod test {
use std::sync::Arc;
use std::net::IpAddr;
use super::IpList;
#[test]
fn test_from_iterator() {
let ip_list: IpList = ["127.0.0.1", "127.0.0.2"]
.iter().map(|x| x.parse().unwrap())
.collect();
assert_eq!(ip_list,
IpList::parse_list(&[ "127.0.0.1", "127.0.0.2" ]).unwrap());
}
#[test]
fn test_from_vec() {
let vec = ["127.0.0.1", "127.0.0.2"]
.iter().map(|x| x.parse().unwrap())
.collect::<Vec<IpAddr>>();
assert_eq!(IpList::from(vec),
IpList(Arc::new(vec![
"127.0.0.1".parse().unwrap(),
"127.0.0.2".parse().unwrap(),
])));
}
}