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extern crate futures;
extern crate abstract_ns;
extern crate futures_cpupool;
use std::net::ToSocketAddrs;
use futures::{BoxFuture, failed, Future};
use abstract_ns::{Resolver, Name, Address, Error};
use futures_cpupool::CpuPool;
#[derive(Clone)]
pub struct ThreadedResolver {
pool: CpuPool,
}
impl ThreadedResolver {
pub fn new(pool: CpuPool) -> Self {
ThreadedResolver {
pool: pool,
}
}
}
fn parse_name(name: &str) -> Option<(&str, Option<u16>)> {
if let Some(idx) = name.find(':') {
match name[idx+1..].parse() {
Ok(port) => Some((&name[..idx], Some(port))),
Err(_) => None,
}
} else {
Some((name, None))
}
}
impl Resolver for ThreadedResolver {
fn resolve(&self, name: Name) -> BoxFuture<Address, Error> {
match parse_name(name) {
Some((_, None)) => {
failed(Error::InvalidName(name.to_string(),
"default port must be specified for stub resolver"))
.boxed()
}
Some((host, Some(port))) => {
let host = host.to_string();
self.pool.spawn_fn(move || {
match (&host[..], port).to_socket_addrs() {
Ok(it) => Ok(it.collect()),
Err(e) => Err(Error::TemporaryError(Box::new(e))),
}
}).boxed()
}
None => {
failed(Error::InvalidName(name.to_string(),
"default port can't be parsed"))
.boxed()
}
}
}
}