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use std::time::Instant;
use std::collections::hash_map::Entry;
use std::collections::HashMap;
use util::interval::{Interval, RealInterval};
use message::{Command, Payload};
use message::types::{Ping, Pong};
const ENORMOUS_PING_DELAY: f64 = 10f64;
#[derive(Default, Clone, Debug)]
pub struct RunningAverage {
count: u64,
bytes: u64,
}
impl RunningAverage {
fn new(initial: usize) -> Self {
RunningAverage { count: 1, bytes: initial as u64 }
}
fn add(&mut self, bytes: usize) {
self.count += 1;
self.bytes = (self.bytes as i64 + ((bytes as i64 - self.bytes as i64) / self.count as i64)) as u64;
}
pub fn val(&self) -> u64 {
self.bytes
}
}
pub enum Flow { Receive, Send }
#[derive(Default, Clone)]
pub struct PeerStats<T: Interval = RealInterval> {
pub last_send: u32,
pub last_recv: u32,
pub total_send: u64,
pub total_recv: u64,
pub avg_ping: f64,
pub min_ping: Option<f64>,
send_avg: HashMap<Command, RunningAverage>,
recv_avg: HashMap<Command, RunningAverage>,
last_ping: Option<Instant>,
ping_count: u64,
interval: T,
}
impl<I: Interval> PeerStats<I> {
pub fn with_interval(interval: I) -> PeerStats<I> {
PeerStats {
interval: interval,
.. PeerStats::default()
}
}
pub fn report_send(&mut self, command: Command, bytes: usize) {
self.total_send += bytes as u64;
self.last_send = ::time::get_time().sec as u32;
if command == Ping::command() {
self.report_ping_send();
}
match self.send_avg.entry(command) {
Entry::Occupied(mut avg) => {
avg.get_mut().add(bytes);
},
Entry::Vacant(entry) => {
entry.insert(RunningAverage::new(bytes));
},
}
}
fn report_ping_send(&mut self) {
self.last_ping = Some(self.interval.now());
self.ping_count += 1;
}
fn report_pong_recv(&mut self) {
if let Some(last_ping) = self.last_ping {
let dur = self.interval.elapsed(last_ping);
let update = if dur.as_secs() > 10 {
ENORMOUS_PING_DELAY
}
else {
f64::from(dur.as_secs() as u32) + f64::from(dur.subsec_nanos()) / 1e9
};
self.min_ping = Some(self.min_ping.unwrap_or(ENORMOUS_PING_DELAY).min(update));
self.avg_ping += (update - self.avg_ping) / (self.ping_count as f64);
}
}
pub fn report_recv(&mut self, command: Command, bytes: usize) {
self.total_recv += bytes as u64;
self.last_recv = ::time::get_time().sec as u32;
if command == Pong::command() {
self.report_pong_recv();
}
match self.recv_avg.entry(command) {
Entry::Occupied(mut avg) => {
avg.get_mut().add(bytes);
},
Entry::Vacant(entry) => {
entry.insert(RunningAverage::new(bytes));
},
}
}
pub fn avg<T>(&self, dir: Flow, cmd: T) -> u64
where T: Into<Command>
{
match dir {
Flow::Receive => self.recv_avg.get(&cmd.into()).and_then(|x| Some(x.val())).unwrap_or_default(),
Flow::Send => self.send_avg.get(&cmd.into()).and_then(|x| Some(x.val())).unwrap_or_default(),
}
}
}
#[cfg(test)]
mod tests {
use super::{RunningAverage, PeerStats, Flow};
use util::interval::{FixedIntervalSpawner, RealInterval};
#[test]
fn avg() {
let mut avg = RunningAverage::new(10);
avg.add(12);
assert_eq!(avg.bytes, 11);
}
#[test]
fn avg_l() {
let mut avg = RunningAverage::new(10);
avg.add(12);
avg.add(20);
avg.add(28);
avg.add(12);
assert_eq!(avg.bytes, 16);
}
#[test]
fn smoky() {
let mut stats = PeerStats::<FixedIntervalSpawner>::with_interval(FixedIntervalSpawner::new(50));
stats.report_send("ping".into(), 200);
assert_eq!(stats.send_avg[&"ping".into()].val(), 200);
stats.report_recv("pong".into(), 50);
assert!(stats.avg_ping > 0.03);
assert!(stats.avg_ping < 0.1);
}
#[test]
fn avg_t() {
let mut stats = PeerStats::<RealInterval>::default();
stats.report_send("inv".into(), 200);
stats.report_send("inv".into(), 300);
assert_eq!(stats.avg(Flow::Send, "inv"), 250);
let mut stats = PeerStats::<RealInterval>::default();
stats.report_recv("inv".into(), 2000);
stats.report_recv("inv".into(), 3000);
assert_eq!(stats.avg(Flow::Receive, "inv"), 2500);
}
}