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extern crate aio_limited;
#[macro_use]
extern crate futures;
extern crate libp2p_core;
#[macro_use]
extern crate log;
extern crate tokio_executor;
extern crate tokio_io;
use aio_limited::{Limited, Limiter};
use futures::prelude::*;
use libp2p_core::{Multiaddr, Transport};
use std::io;
use tokio_executor::Executor;
use tokio_io::{AsyncRead, AsyncWrite, io::{ReadHalf, WriteHalf}};
#[derive(Clone)]
pub struct RateLimited<T> {
value: T,
rlimiter: Limiter,
wlimiter: Limiter,
}
impl<T> RateLimited<T> {
pub fn new<E: Executor>(
e: &mut E,
value: T,
max_read: usize,
max_write: usize,
) -> io::Result<RateLimited<T>> {
Ok(RateLimited {
value,
rlimiter: Limiter::new(e, max_read).map_err(|e| {
error!("failed to create read limiter: {}", e);
io::Error::new(io::ErrorKind::Other, e)
})?,
wlimiter: Limiter::new(e, max_write).map_err(|e| {
error!("failed to create write limiter: {}", e);
io::Error::new(io::ErrorKind::Other, e)
})?,
})
}
fn from_parts(value: T, r: Limiter, w: Limiter) -> RateLimited<T> {
RateLimited {
value,
rlimiter: r,
wlimiter: w,
}
}
}
pub struct Connection<C: AsyncRead + AsyncWrite> {
reader: Limited<ReadHalf<C>>,
writer: Limited<WriteHalf<C>>,
}
impl<C: AsyncRead + AsyncWrite> Connection<C> {
pub fn new(c: C, rlimiter: Limiter, wlimiter: Limiter) -> io::Result<Connection<C>> {
let (r, w) = c.split();
Ok(Connection {
reader: Limited::new(r, rlimiter).map_err(|e| {
error!("failed to create limited reader: {}", e);
io::Error::new(io::ErrorKind::Other, e)
})?,
writer: Limited::new(w, wlimiter).map_err(|e| {
error!("failed to create limited writer: {}", e);
io::Error::new(io::ErrorKind::Other, e)
})?,
})
}
}
impl<C: AsyncRead + AsyncWrite> io::Read for Connection<C> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.reader.read(buf)
}
}
impl<C: AsyncRead + AsyncWrite> io::Write for Connection<C> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.writer.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.writer.flush()
}
}
impl<C: AsyncRead + AsyncWrite> AsyncRead for Connection<C> {}
impl<C: AsyncRead + AsyncWrite> AsyncWrite for Connection<C> {
fn shutdown(&mut self) -> Poll<(), io::Error> {
self.writer.shutdown()
}
}
pub struct Listener<T: Transport>(RateLimited<T::Listener>);
impl<T: Transport> Stream for Listener<T> {
type Item = (ListenerUpgrade<T>, Multiaddr);
type Error = io::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
match try_ready!(self.0.value.poll()) {
Some((upgrade, addr)) => {
let r = self.0.rlimiter.clone();
let w = self.0.wlimiter.clone();
let u = ListenerUpgrade(RateLimited::from_parts(upgrade, r, w));
Ok(Async::Ready(Some((u, addr))))
}
None => Ok(Async::Ready(None)),
}
}
}
#[must_use = "futures do nothing unless polled"]
pub struct ListenerUpgrade<T: Transport>(RateLimited<T::ListenerUpgrade>);
impl<T> Future for ListenerUpgrade<T>
where
T: Transport,
T::Output: AsyncRead + AsyncWrite
{
type Item = Connection<T::Output>;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let conn = try_ready!(self.0.value.poll());
let r = self.0.rlimiter.clone();
let w = self.0.wlimiter.clone();
Ok(Async::Ready(Connection::new(conn, r, w)?))
}
}
impl<T> Transport for RateLimited<T>
where
T: Transport,
T::Output: AsyncRead + AsyncWrite
{
type Output = Connection<T::Output>;
type Listener = Listener<T>;
type ListenerUpgrade = ListenerUpgrade<T>;
type Dial = DialFuture<T::Dial>;
fn listen_on(self, addr: Multiaddr) -> Result<(Self::Listener, Multiaddr), (Self, Multiaddr)> {
let r = self.rlimiter;
let w = self.wlimiter;
self.value
.listen_on(addr)
.map(|(listener, a)| {
(
Listener(RateLimited::from_parts(listener, r.clone(), w.clone())),
a,
)
})
.map_err(|(transport, a)| (RateLimited::from_parts(transport, r, w), a))
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, (Self, Multiaddr)> {
let r = self.rlimiter;
let w = self.wlimiter;
match self.value.dial(addr) {
Ok(dial) => Ok(DialFuture { r, w, f: dial }),
Err((t, a)) => Err((RateLimited::from_parts(t, r, w), a))
}
}
fn nat_traversal(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
self.value.nat_traversal(server, observed)
}
}
pub struct DialFuture<T> {
r: Limiter,
w: Limiter,
f: T
}
impl<T> Future for DialFuture<T>
where
T: Future,
T::Item: AsyncRead + AsyncWrite,
T::Error: From<io::Error>
{
type Item = Connection<T::Item>;
type Error = T::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let item = try_ready!(self.f.poll());
Ok(Async::Ready(Connection::new(item, self.r.clone(), self.w.clone())?))
}
}