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elastic ping pong to adapt env with packet loss (#4)

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* elastic ping pong to adapt env with packet loss
This commit is contained in:
Sijie.Sun 2024-01-29 23:21:13 +08:00 committed by GitHub
parent 6271f9a7a7
commit 118954c745
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GPG Key ID: B5690EEEBB952194
5 changed files with 389 additions and 154 deletions
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1
easytier-core/proto/cli.proto
View File

@ -29,6 +29,7 @@ message PeerConnInfo {
repeated string features = 4;
TunnelInfo tunnel = 5;
PeerConnStats stats = 6;
float loss_rate = 7;
}
message PeerInfo {

12
easytier-core/src/peers/packet.rs
View File

@ -71,8 +71,8 @@ pub struct RoutePacket {
pub enum CtrlPacketBody {
HandShake(HandShake),
RoutePacket(RoutePacket),
Ping,
Pong,
Ping(u32),
Pong(u32),
TaRpc(u32, bool, Vec<u8>), // u32: service_id, bool: is_req, Vec<u8>: rpc body
}
@ -155,19 +155,19 @@ impl Packet {
}
}
pub fn new_ping_packet(from_peer: uuid::Uuid, to_peer: uuid::Uuid) -> Self {
pub fn new_ping_packet(from_peer: uuid::Uuid, to_peer: uuid::Uuid, seq: u32) -> Self {
Packet {
from_peer: from_peer.into(),
to_peer: Some(to_peer.into()),
body: PacketBody::Ctrl(CtrlPacketBody::Ping),
body: PacketBody::Ctrl(CtrlPacketBody::Ping(seq)),
}
}
pub fn new_pong_packet(from_peer: uuid::Uuid, to_peer: uuid::Uuid) -> Self {
pub fn new_pong_packet(from_peer: uuid::Uuid, to_peer: uuid::Uuid, seq: u32) -> Self {
Packet {
from_peer: from_peer.into(),
to_peer: Some(to_peer.into()),
body: PacketBody::Ctrl(CtrlPacketBody::Pong),
body: PacketBody::Ctrl(CtrlPacketBody::Pong(seq)),
}
}

415
easytier-core/src/peers/peer_conn.rs
View File

@ -1,11 +1,18 @@
use std::{pin::Pin, sync::Arc};
use std::{
fmt::Debug,
pin::Pin,
sync::{
atomic::{AtomicU32, Ordering},
Arc,
},
};
use easytier_rpc::{PeerConnInfo, PeerConnStats};
use futures::{SinkExt, StreamExt};
use pnet::datalink::NetworkInterface;
use tokio::{
sync::{broadcast, mpsc},
sync::{broadcast, mpsc, Mutex},
task::JoinSet,
time::{timeout, Duration},
};
@ -56,6 +63,19 @@ macro_rules! wait_response {
};
}
fn build_ctrl_msg(msg: Bytes, is_req: bool) -> Bytes {
let prefix: &'static [u8] = if is_req {
CTRL_REQ_PACKET_PREFIX
} else {
CTRL_RESP_PACKET_PREFIX
};
let mut new_msg = BytesMut::new();
new_msg.reserve(prefix.len() + msg.len());
new_msg.extend_from_slice(prefix);
new_msg.extend_from_slice(&msg);
new_msg.into()
}
pub struct PeerInfo {
magic: u32,
pub my_peer_id: uuid::Uuid,
@ -76,6 +96,202 @@ impl<'a> From<&ArchivedHandShake> for PeerInfo {
}
}
struct PeerConnPinger {
my_node_id: uuid::Uuid,
peer_id: uuid::Uuid,
sink: Arc<Mutex<Pin<Box<dyn DatagramSink>>>>,
ctrl_sender: broadcast::Sender<Bytes>,
latency_stats: Arc<WindowLatency>,
loss_rate_stats: Arc<AtomicU32>,
tasks: JoinSet<Result<(), TunnelError>>,
}
impl Debug for PeerConnPinger {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("PeerConnPinger")
.field("my_node_id", &self.my_node_id)
.field("peer_id", &self.peer_id)
.finish()
}
}
impl PeerConnPinger {
pub fn new(
my_node_id: uuid::Uuid,
peer_id: uuid::Uuid,
sink: Pin<Box<dyn DatagramSink>>,
ctrl_sender: broadcast::Sender<Bytes>,
latency_stats: Arc<WindowLatency>,
loss_rate_stats: Arc<AtomicU32>,
) -> Self {
Self {
my_node_id,
peer_id,
sink: Arc::new(Mutex::new(sink)),
tasks: JoinSet::new(),
latency_stats,
ctrl_sender,
loss_rate_stats,
}
}
pub async fn ping(&self) -> Result<(), TunnelError> {
let mut sink = self.sink.lock().await;
let ping_packet = Packet::new_ping_packet(uuid::Uuid::new_v4(), uuid::Uuid::new_v4(), 0);
sink.send(ping_packet.into()).await?;
Ok(())
}
async fn do_pingpong_once(
my_node_id: uuid::Uuid,
peer_id: uuid::Uuid,
sink: Arc<Mutex<Pin<Box<dyn DatagramSink>>>>,
receiver: &mut broadcast::Receiver<Bytes>,
seq: u32,
) -> Result<u128, TunnelError> {
// should add seq here. so latency can be calculated more accurately
let req = build_ctrl_msg(
packet::Packet::new_ping_packet(my_node_id, peer_id, seq).into(),
true,
);
tracing::trace!("send ping packet: {:?}", req);
sink.lock().await.send(req).await.map_err(|e| {
tracing::warn!("send ping packet error: {:?}", e);
TunnelError::CommonError("send ping packet error".to_owned())
})?;
let now = std::time::Instant::now();
// wait until we get a pong packet in ctrl_resp_receiver
let resp = timeout(Duration::from_secs(1), async {
loop {
match receiver.recv().await {
Ok(p) => {
if let packet::ArchivedPacketBody::Ctrl(
packet::ArchivedCtrlPacketBody::Pong(resp_seq),
) = &Packet::decode(&p).body
{
if *resp_seq == seq {
break;
}
}
}
Err(e) => {
log::warn!("recv pong resp error: {:?}", e);
return Err(TunnelError::WaitRespError(
"recv pong resp error".to_owned(),
));
}
}
}
Ok(())
})
.await;
tracing::trace!(?resp, "wait ping response done");
if resp.is_err() {
return Err(TunnelError::WaitRespError(
"wait ping response timeout".to_owned(),
));
}
if resp.as_ref().unwrap().is_err() {
return Err(resp.unwrap().err().unwrap());
}
Ok(now.elapsed().as_micros())
}
async fn pingpong(&mut self) {
let sink = self.sink.clone();
let my_node_id = self.my_node_id;
let peer_id = self.peer_id;
let latency_stats = self.latency_stats.clone();
let (ping_res_sender, mut ping_res_receiver) = tokio::sync::mpsc::channel(100);
// generate a pingpong task every 200ms
let mut pingpong_tasks = JoinSet::new();
let ctrl_resp_sender = self.ctrl_sender.clone();
self.tasks.spawn(async move {
let mut req_seq = 0;
loop {
let receiver = ctrl_resp_sender.subscribe();
let ping_res_sender = ping_res_sender.clone();
let sink = sink.clone();
while pingpong_tasks.len() > 5 {
pingpong_tasks.join_next().await;
}
pingpong_tasks.spawn(async move {
let mut receiver = receiver.resubscribe();
let pingpong_once_ret = Self::do_pingpong_once(
my_node_id,
peer_id,
sink.clone(),
&mut receiver,
req_seq,
)
.await;
let _ = ping_res_sender.send(pingpong_once_ret).await;
});
req_seq += 1;
tokio::time::sleep(Duration::from_millis(350)).await;
}
});
// one with 1% precision
let loss_rate_stats_1 = WindowLatency::new(100);
// one with 20% precision, so we can fast fail this conn.
let loss_rate_stats_20 = WindowLatency::new(5);
let mut counter: u64 = 0;
while let Some(ret) = ping_res_receiver.recv().await {
counter += 1;
if let Ok(lat) = ret {
latency_stats.record_latency(lat as u32);
loss_rate_stats_1.record_latency(0);
loss_rate_stats_20.record_latency(0);
} else {
loss_rate_stats_1.record_latency(1);
loss_rate_stats_20.record_latency(1);
}
let loss_rate_20: f64 = loss_rate_stats_20.get_latency_us();
let loss_rate_1: f64 = loss_rate_stats_1.get_latency_us();
tracing::warn!(
?ret,
?self,
?loss_rate_1,
?loss_rate_20,
"pingpong task recv pingpong_once result"
);
if (counter > 5 && loss_rate_20 > 0.74) || (counter > 150 && loss_rate_1 > 0.20) {
log::warn!(
"pingpong loss rate too high, my_node_id: {}, peer_id: {}, loss_rate_20: {}, loss_rate_1: {}",
my_node_id,
peer_id,
loss_rate_20,
loss_rate_1,
);
break;
}
self.loss_rate_stats
.store((loss_rate_20 * 100.0) as u32, Ordering::Relaxed);
}
}
}
define_tunnel_filter_chain!(PeerConnTunnel, stats = StatsRecorderTunnelFilter);
pub struct PeerConn {
@ -97,6 +313,7 @@ pub struct PeerConn {
latency_stats: Arc<WindowLatency>,
throughput: Arc<Throughput>,
loss_rate_stats: Arc<AtomicU32>,
}
enum PeerConnPacketType {
@ -132,6 +349,7 @@ impl PeerConn {
latency_stats: Arc::new(WindowLatency::new(15)),
throughput: peer_conn_tunnel.stats.get_throughput().clone(),
loss_rate_stats: Arc::new(AtomicU32::new(0)),
}
}
@ -177,104 +395,6 @@ impl PeerConn {
self.info.is_some()
}
async fn do_pingpong_once(
my_node_id: uuid::Uuid,
peer_id: uuid::Uuid,
sink: &mut Pin<Box<dyn DatagramSink>>,
receiver: &mut broadcast::Receiver<Bytes>,
) -> Result<u128, TunnelError> {
// should add seq here. so latency can be calculated more accurately
let req = Self::build_ctrl_msg(
packet::Packet::new_ping_packet(my_node_id, peer_id).into(),
true,
);
log::trace!("send ping packet: {:?}", req);
sink.send(req).await?;
let now = std::time::Instant::now();
// wait until we get a pong packet in ctrl_resp_receiver
let resp = timeout(Duration::from_secs(4), async {
loop {
match receiver.recv().await {
Ok(p) => {
if let packet::ArchivedPacketBody::Ctrl(
packet::ArchivedCtrlPacketBody::Pong,
) = &Packet::decode(&p).body
{
break;
}
}
Err(e) => {
log::warn!("recv pong resp error: {:?}", e);
return Err(TunnelError::WaitRespError(
"recv pong resp error".to_owned(),
));
}
}
}
Ok(())
})
.await;
if resp.is_err() {
return Err(TunnelError::WaitRespError(
"wait ping response timeout".to_owned(),
));
}
if resp.as_ref().unwrap().is_err() {
return Err(resp.unwrap().err().unwrap());
}
Ok(now.elapsed().as_micros())
}
fn start_pingpong(&mut self) {
let mut sink = self.tunnel.pin_sink();
let my_node_id = self.my_node_id;
let peer_id = self.get_peer_id();
let receiver = self.ctrl_resp_sender.subscribe();
let close_event_sender = self.close_event_sender.clone().unwrap();
let conn_id = self.conn_id;
let latency_stats = self.latency_stats.clone();
self.tasks.spawn(async move {
//sleep 1s
tokio::time::sleep(Duration::from_secs(1)).await;
loop {
let mut receiver = receiver.resubscribe();
if let Ok(lat) =
Self::do_pingpong_once(my_node_id, peer_id, &mut sink, &mut receiver).await
{
log::trace!(
"pingpong latency: {}us, my_node_id: {}, peer_id: {}",
lat,
my_node_id,
peer_id
);
latency_stats.record_latency(lat as u64);
tokio::time::sleep(Duration::from_secs(1)).await;
} else {
break;
}
}
log::warn!(
"pingpong task exit, my_node_id: {}, peer_id: {}",
my_node_id,
peer_id,
);
if let Err(e) = close_event_sender.send(conn_id).await {
log::warn!("close event sender error: {:?}", e);
}
Ok(())
});
}
fn get_packet_type(mut bytes_item: Bytes) -> PeerConnPacketType {
if bytes_item.starts_with(CTRL_REQ_PACKET_PREFIX) {
PeerConnPacketType::CtrlReq(bytes_item.split_off(CTRL_REQ_PACKET_PREFIX.len()))
@ -291,12 +411,13 @@ impl PeerConn {
) -> Result<Bytes, TunnelError> {
let packet = Packet::decode(&bytes_item);
match packet.body {
packet::ArchivedPacketBody::Ctrl(packet::ArchivedCtrlPacketBody::Ping) => {
packet::ArchivedPacketBody::Ctrl(packet::ArchivedCtrlPacketBody::Ping(seq)) => {
log::trace!("recv ping packet: {:?}", packet);
Ok(Self::build_ctrl_msg(
Ok(build_ctrl_msg(
packet::Packet::new_pong_packet(
conn_info.my_node_id.parse().unwrap(),
conn_info.peer_id.parse().unwrap(),
seq.into(),
)
.into(),
false,
@ -309,6 +430,32 @@ impl PeerConn {
}
}
fn start_pingpong(&mut self) {
let mut pingpong = PeerConnPinger::new(
self.my_node_id,
self.get_peer_id(),
self.tunnel.pin_sink(),
self.ctrl_resp_sender.clone(),
self.latency_stats.clone(),
self.loss_rate_stats.clone(),
);
let close_event_sender = self.close_event_sender.clone().unwrap();
let conn_id = self.conn_id;
self.tasks.spawn(async move {
pingpong.pingpong().await;
tracing::warn!(?pingpong, "pingpong task exit");
if let Err(e) = close_event_sender.send(conn_id).await {
log::warn!("close event sender error: {:?}", e);
}
Ok(())
});
}
pub fn start_recv_loop(&mut self, packet_recv_chan: PacketRecvChan) {
let mut stream = self.tunnel.pin_stream();
let mut sink = self.tunnel.pin_sink();
@ -356,27 +503,12 @@ impl PeerConn {
tracing::info_span!("peer conn recv loop", conn_info = ?conn_info_for_instrument),
),
);
self.start_pingpong();
}
pub async fn send_msg(&mut self, msg: Bytes) -> Result<(), TunnelError> {
self.sink.send(msg).await
}
fn build_ctrl_msg(msg: Bytes, is_req: bool) -> Bytes {
let prefix: &'static [u8] = if is_req {
CTRL_REQ_PACKET_PREFIX
} else {
CTRL_RESP_PACKET_PREFIX
};
let mut new_msg = BytesMut::new();
new_msg.reserve(prefix.len() + msg.len());
new_msg.extend_from_slice(prefix);
new_msg.extend_from_slice(&msg);
new_msg.into()
}
pub fn get_peer_id(&self) -> uuid::Uuid {
self.info.as_ref().unwrap().my_peer_id
}
@ -405,6 +537,7 @@ impl PeerConn {
features: self.info.as_ref().unwrap().features.clone(),
tunnel: self.tunnel.info(),
stats: Some(self.get_stats()),
loss_rate: (f64::from(self.loss_rate_stats.load(Ordering::Relaxed)) / 100.0) as f32,
}
}
}
@ -426,8 +559,10 @@ mod tests {
use super::*;
use crate::common::config_fs::ConfigFs;
use crate::common::global_ctx::tests::get_mock_global_ctx;
use crate::common::global_ctx::GlobalCtx;
use crate::common::netns::NetNS;
use crate::tunnels::tunnel_filter::tests::DropSendTunnelFilter;
use crate::tunnels::tunnel_filter::{PacketRecorderTunnelFilter, TunnelWithFilter};
#[tokio::test]
@ -481,4 +616,50 @@ mod tests {
assert_eq!(c_peer.get_peer_id(), s_uuid);
assert_eq!(s_peer.get_peer_id(), c_uuid);
}
async fn peer_conn_pingpong_test_common(drop_start: u32, drop_end: u32, conn_closed: bool) {
use crate::tunnels::ring_tunnel::create_ring_tunnel_pair;
let (c, s) = create_ring_tunnel_pair();
// drop 1-3 packets should not affect pingpong
let c_recorder = Arc::new(DropSendTunnelFilter::new(drop_start, drop_end));
let c = TunnelWithFilter::new(c, c_recorder.clone());
let c_uuid = uuid::Uuid::new_v4();
let s_uuid = uuid::Uuid::new_v4();
let mut c_peer = PeerConn::new(c_uuid, get_mock_global_ctx(), Box::new(c));
let mut s_peer = PeerConn::new(s_uuid, get_mock_global_ctx(), Box::new(s));
let (c_ret, s_ret) = tokio::join!(
c_peer.do_handshake_as_client(),
s_peer.do_handshake_as_server()
);
s_peer.set_close_event_sender(tokio::sync::mpsc::channel(1).0);
s_peer.start_recv_loop(tokio::sync::mpsc::channel(200).0);
assert!(c_ret.is_ok());
assert!(s_ret.is_ok());
let (close_send, mut close_recv) = tokio::sync::mpsc::channel(1);
c_peer.set_close_event_sender(close_send);
c_peer.start_pingpong();
c_peer.start_recv_loop(tokio::sync::mpsc::channel(200).0);
// wait 5s, conn should not be disconnected
tokio::time::sleep(Duration::from_secs(5)).await;
if conn_closed {
assert!(close_recv.try_recv().is_ok());
} else {
assert!(close_recv.try_recv().is_err());
}
}
#[tokio::test]
async fn peer_conn_pingpong_timeout() {
peer_conn_pingpong_test_common(3, 5, false).await;
peer_conn_pingpong_test_common(5, 12, true).await;
}
}

24
easytier-core/src/tunnels/stats.rs
View File

@ -1,7 +1,7 @@
use std::sync::atomic::{AtomicU32, AtomicU64};
pub struct WindowLatency {
latency_us_window: Vec<AtomicU64>,
latency_us_window: Vec<AtomicU32>,
latency_us_window_index: AtomicU32,
latency_us_window_size: AtomicU32,
}
@ -9,13 +9,13 @@ pub struct WindowLatency {
impl WindowLatency {
pub fn new(window_size: u32) -> Self {
Self {
latency_us_window: (0..window_size).map(|_| AtomicU64::new(0)).collect(),
latency_us_window: (0..window_size).map(|_| AtomicU32::new(0)).collect(),
latency_us_window_index: AtomicU32::new(0),
latency_us_window_size: AtomicU32::new(window_size),
}
}
pub fn record_latency(&self, latency_us: u64) {
pub fn record_latency(&self, latency_us: u32) {
let index = self
.latency_us_window_index
.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
@ -27,25 +27,27 @@ impl WindowLatency {
.store(latency_us, std::sync::atomic::Ordering::Relaxed);
}
pub fn get_latency_us(&self) -> u64 {
pub fn get_latency_us<T: From<u32> + std::ops::Div<Output = T>>(&self) -> T {
let window_size = self
.latency_us_window_size
.load(std::sync::atomic::Ordering::Relaxed);
let mut sum = 0;
let mut count = 0;
for i in 0..window_size {
let latency_us =
self.latency_us_window[i as usize].load(std::sync::atomic::Ordering::Relaxed);
if latency_us > 0 {
sum += latency_us;
count += 1;
if i >= self
.latency_us_window_index
.load(std::sync::atomic::Ordering::Relaxed)
{
break;
}
sum += self.latency_us_window[i as usize].load(std::sync::atomic::Ordering::Relaxed);
count += 1;
}
if count == 0 {
0
0.into()
} else {
sum / count
(T::from(sum)) / T::from(count)
}
}
}

87
easytier-core/src/tunnels/tunnel_filter.rs
View File

@ -12,8 +12,15 @@ use super::*;
use crate::tunnels::{DatagramSink, DatagramStream, SinkError, SinkItem, StreamItem, Tunnel};
pub trait TunnelFilter {
fn before_send(&self, data: SinkItem) -> Result<SinkItem, SinkError>;
fn after_received(&self, data: StreamItem) -> Result<BytesMut, TunnelError>;
fn before_send(&self, data: SinkItem) -> Option<Result<SinkItem, SinkError>> {
Some(Ok(data))
}
fn after_received(&self, data: StreamItem) -> Option<Result<BytesMut, TunnelError>> {
match data {
Ok(v) => Some(Ok(v)),
Err(e) => Some(Err(e)),
}
}
}
pub struct TunnelWithFilter<T, F> {
@ -45,8 +52,10 @@ where
}
fn start_send(self: Pin<&mut Self>, item: SinkItem) -> Result<(), Self::Error> {
let item = self.filter.before_send(item)?;
self.get_mut().sink.start_send_unpin(item)
let Some(item) = self.filter.before_send(item) else {
return Ok(());
};
self.get_mut().sink.start_send_unpin(item?)
}
fn poll_flush(
@ -83,12 +92,21 @@ where
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let self_mut = self.get_mut();
loop {
match self_mut.stream.poll_next_unpin(cx) {
Poll::Ready(Some(ret)) => {
Poll::Ready(Some(self_mut.filter.after_received(ret)))
let Some(ret) = self_mut.filter.after_received(ret) else {
continue;
};
return Poll::Ready(Some(ret));
}
Poll::Ready(None) => {
return Poll::Ready(None);
}
Poll::Pending => {
return Poll::Pending;
}
}
Poll::Ready(None) => Poll::Ready(None),
Poll::Pending => Poll::Pending,
}
}
}
@ -120,18 +138,18 @@ pub struct PacketRecorderTunnelFilter {
}
impl TunnelFilter for PacketRecorderTunnelFilter {
fn before_send(&self, data: SinkItem) -> Result<SinkItem, SinkError> {
fn before_send(&self, data: SinkItem) -> Option<Result<SinkItem, SinkError>> {
self.received.lock().unwrap().push(data.clone());
Ok(data)
Some(Ok(data))
}
fn after_received(&self, data: StreamItem) -> Result<BytesMut, TunnelError> {
fn after_received(&self, data: StreamItem) -> Option<Result<BytesMut, TunnelError>> {
match data {
Ok(v) => {
self.sent.lock().unwrap().push(v.clone().into());
Ok(v)
Some(Ok(v))
}
Err(e) => Err(e),
Err(e) => Some(Err(e)),
}
}
}
@ -150,18 +168,18 @@ pub struct StatsRecorderTunnelFilter {
}
impl TunnelFilter for StatsRecorderTunnelFilter {
fn before_send(&self, data: SinkItem) -> Result<SinkItem, SinkError> {
fn before_send(&self, data: SinkItem) -> Option<Result<SinkItem, SinkError>> {
self.throughput.record_tx_bytes(data.len() as u64);
Ok(data)
Some(Ok(data))
}
fn after_received(&self, data: StreamItem) -> Result<BytesMut, TunnelError> {
fn after_received(&self, data: StreamItem) -> Option<Result<BytesMut, TunnelError>> {
match data {
Ok(v) => {
self.throughput.record_rx_bytes(v.len() as u64);
Ok(v)
Some(Ok(v))
}
Err(e) => Err(e),
Err(e) => Some(Err(e)),
}
}
}
@ -203,9 +221,42 @@ macro_rules! define_tunnel_filter_chain {
}
#[cfg(test)]
mod tests {
pub mod tests {
use std::sync::atomic::{AtomicU32, Ordering};
use super::*;
use crate::tunnels::ring_tunnel::RingTunnel;
pub struct DropSendTunnelFilter {
start: AtomicU32,
end: AtomicU32,
cur: AtomicU32,
}
impl TunnelFilter for DropSendTunnelFilter {
fn before_send(&self, data: SinkItem) -> Option<Result<SinkItem, SinkError>> {
self.cur.fetch_add(1, Ordering::SeqCst);
if self.cur.load(Ordering::SeqCst) >= self.start.load(Ordering::SeqCst)
&& self.cur.load(std::sync::atomic::Ordering::SeqCst)
< self.end.load(Ordering::SeqCst)
{
tracing::trace!("drop packet: {:?}", data);
return None;
}
Some(Ok(data))
}
}
impl DropSendTunnelFilter {
pub fn new(start: u32, end: u32) -> Self {
Self {
start: AtomicU32::new(start),
end: AtomicU32::new(end),
cur: AtomicU32::new(0),
}
}
}
#[tokio::test]
async fn test_nested_filter() {
define_tunnel_filter_chain!(