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use crate::{Multiaddr, core::{Transport, transport::{ListenerEvent, TransportError}}};
use futures::{prelude::*, io::{IoSlice, IoSliceMut}, ready};
use lazy_static::lazy_static;
use parking_lot::Mutex;
use smallvec::{smallvec, SmallVec};
use std::{cmp, io, pin::Pin, sync::Arc, task::{Context, Poll}, time::Duration};
use wasm_timer::Instant;
#[derive(Clone)]
pub struct BandwidthLogging<TInner> {
inner: TInner,
sinks: Arc<BandwidthSinks>,
}
impl<TInner> BandwidthLogging<TInner> {
pub fn new(inner: TInner, period: Duration) -> (Self, Arc<BandwidthSinks>) {
let mut period_seconds = cmp::min(period.as_secs(), 86400) as u32;
if period.subsec_nanos() > 0 {
period_seconds += 1;
}
let sink = Arc::new(BandwidthSinks {
download: Mutex::new(BandwidthSink::new(period_seconds)),
upload: Mutex::new(BandwidthSink::new(period_seconds)),
});
let trans = BandwidthLogging {
inner,
sinks: sink.clone(),
};
(trans, sink)
}
}
impl<TInner> Transport for BandwidthLogging<TInner>
where
TInner: Transport,
{
type Output = BandwidthConnecLogging<TInner::Output>;
type Error = TInner::Error;
type Listener = BandwidthListener<TInner::Listener>;
type ListenerUpgrade = BandwidthFuture<TInner::ListenerUpgrade>;
type Dial = BandwidthFuture<TInner::Dial>;
fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
let sinks = self.sinks;
self.inner
.listen_on(addr)
.map(move |inner| BandwidthListener { inner, sinks })
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
let sinks = self.sinks;
self.inner
.dial(addr)
.map(move |fut| BandwidthFuture { inner: fut, sinks })
}
}
#[pin_project::pin_project]
pub struct BandwidthListener<TInner> {
#[pin]
inner: TInner,
sinks: Arc<BandwidthSinks>,
}
impl<TInner, TConn, TErr> Stream for BandwidthListener<TInner>
where
TInner: TryStream<Ok = ListenerEvent<TConn, TErr>, Error = TErr>
{
type Item = Result<ListenerEvent<BandwidthFuture<TConn>, TErr>, TErr>;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
let this = self.project();
let event =
if let Some(event) = ready!(this.inner.try_poll_next(cx)?) {
event
} else {
return Poll::Ready(None)
};
let event = event.map({
let sinks = this.sinks.clone();
|inner| BandwidthFuture { inner, sinks }
});
Poll::Ready(Some(Ok(event)))
}
}
#[pin_project::pin_project]
pub struct BandwidthFuture<TInner> {
#[pin]
inner: TInner,
sinks: Arc<BandwidthSinks>,
}
impl<TInner: TryFuture> Future for BandwidthFuture<TInner> {
type Output = Result<BandwidthConnecLogging<TInner::Ok>, TInner::Error>;
fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
let this = self.project();
let inner = ready!(this.inner.try_poll(cx)?);
let logged = BandwidthConnecLogging { inner, sinks: this.sinks.clone() };
Poll::Ready(Ok(logged))
}
}
pub struct BandwidthSinks {
download: Mutex<BandwidthSink>,
upload: Mutex<BandwidthSink>,
}
impl BandwidthSinks {
pub fn average_download_per_sec(&self) -> u64 {
self.download.lock().get()
}
pub fn average_upload_per_sec(&self) -> u64 {
self.upload.lock().get()
}
}
#[pin_project::pin_project]
pub struct BandwidthConnecLogging<TInner> {
#[pin]
inner: TInner,
sinks: Arc<BandwidthSinks>,
}
impl<TInner: AsyncRead> AsyncRead for BandwidthConnecLogging<TInner> {
fn poll_read(self: Pin<&mut Self>, cx: &mut Context, buf: &mut [u8]) -> Poll<io::Result<usize>> {
let this = self.project();
let num_bytes = ready!(this.inner.poll_read(cx, buf))?;
this.sinks.download.lock().inject(num_bytes);
Poll::Ready(Ok(num_bytes))
}
fn poll_read_vectored(self: Pin<&mut Self>, cx: &mut Context, bufs: &mut [IoSliceMut]) -> Poll<io::Result<usize>> {
let this = self.project();
let num_bytes = ready!(this.inner.poll_read_vectored(cx, bufs))?;
this.sinks.download.lock().inject(num_bytes);
Poll::Ready(Ok(num_bytes))
}
}
impl<TInner: AsyncWrite> AsyncWrite for BandwidthConnecLogging<TInner> {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context, buf: &[u8]) -> Poll<io::Result<usize>> {
let this = self.project();
let num_bytes = ready!(this.inner.poll_write(cx, buf))?;
this.sinks.upload.lock().inject(num_bytes);
Poll::Ready(Ok(num_bytes))
}
fn poll_write_vectored(self: Pin<&mut Self>, cx: &mut Context, bufs: &[IoSlice]) -> Poll<io::Result<usize>> {
let this = self.project();
let num_bytes = ready!(this.inner.poll_write_vectored(cx, bufs))?;
this.sinks.upload.lock().inject(num_bytes);
Poll::Ready(Ok(num_bytes))
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
let this = self.project();
this.inner.poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
let this = self.project();
this.inner.poll_close(cx)
}
}
fn current_second() -> u32 {
lazy_static! {
static ref EPOCH: Instant = Instant::now();
}
EPOCH.elapsed().as_secs() as u32
}
struct BandwidthSink {
bytes: SmallVec<[u64; 8]>,
latest_update: u32,
}
impl BandwidthSink {
fn new(seconds: u32) -> Self {
BandwidthSink {
bytes: smallvec![0; seconds as usize + 1],
latest_update: current_second(),
}
}
fn get(&mut self) -> u64 {
self.update();
let seconds = self.bytes.len() - 1;
self.bytes.iter()
.take(seconds)
.fold(0u64, |a, &b| a.saturating_add(b)) / seconds as u64
}
fn inject(&mut self, bytes: usize) {
self.update();
if let Some(last) = self.bytes.last_mut() {
*last = last.saturating_add(bytes as u64);
}
}
fn update(&mut self) {
let current_second = current_second();
debug_assert!(current_second >= self.latest_update);
let num_iter = cmp::min(current_second - self.latest_update, self.bytes.len() as u32);
for _ in 0..num_iter {
self.bytes.remove(0);
self.bytes.push(0);
}
self.latest_update = current_second;
}
}
#[cfg(test)]
mod tests {
use std::{thread, time::Duration};
use super::*;
#[test]
fn sink_works() {
let mut sink = BandwidthSink::new(5);
sink.inject(100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 20);
sink.inject(100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 40);
sink.inject(100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 60);
sink.inject(100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 80);
sink.inject(100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 100);
thread::sleep(Duration::from_millis(1000));
assert_eq!(sink.get(), 80);
}
}