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use crossbeam_channel::{Receiver, Sender}; use fxhash::FxHashMap; pub use hdrhistogram as histogram; use hdrhistogram::Histogram; use parking_lot::Mutex; use quanta::Clock; use std::{ sync::{ atomic::{AtomicBool, Ordering}, Arc, }, thread::JoinHandle, }; #[macro_export] pub use game_metrics_macro::instrument; #[macro_export] macro_rules! scope( ($span_name:literal) => ( let __INSTR_METRICS_SCOPE = $crate::Span::new($span_name); ) ); pub struct Channel { channel: (Sender<Event>, Receiver<Event>), clock: Clock, } impl Channel { fn new() -> Self { Self { channel: crossbeam_channel::unbounded(), clock: Clock::default(), } } pub fn send(&self, event: Event) { self.channel.0.send(event); } pub fn recv(&self) -> Option<Event> { if let Ok(event) = self.channel.1.try_recv() { Some(event) } else { None } } } pub enum Event { Enter(&'static str), Exit { span_name: &'static str, elapsed: u64, }, } impl Event { fn name(&self) -> &'static str { match self { Event::Enter(name) => name, Event::Exit { span_name, .. } => span_name, } } } lazy_static::lazy_static! { static ref CHANNEL: Channel = Channel::new(); } pub struct Span { name: &'static str, start: u64, } impl Span { pub fn new(name: &'static str) -> Self { CHANNEL.send(Event::Enter(name)); Self { name, start: CHANNEL.clock.now(), } } } impl Drop for Span { fn drop(&mut self) { let elapsed = CHANNEL.clock.now() - self.start; CHANNEL.send(Event::Exit { span_name: self.name, elapsed, }); } } pub struct Metrics { histograms: Arc<Mutex<FxHashMap<&'static str, Histogram<u64>>>>, worker_handle: Option<JoinHandle<()>>, worker_flag: Arc<AtomicBool>, } impl Metrics { pub fn for_each_histogram<F>(&self, f: F) where F: Fn(&'static str, &Histogram<u64>), { self.histograms .lock() .iter() .for_each(|(name, histogram)| (f)(name, histogram)) } pub fn new(sigfig: u8) -> Metrics { let worker_flag = Arc::new(AtomicBool::new(true)); let histograms = Arc::new(Mutex::new(FxHashMap::default())); let inner_histograms = histograms.clone(); let inner_flag = worker_flag.clone(); let worker_handle = std::thread::spawn(move || { while inner_flag.load(Ordering::Relaxed) { while let Some(event) = CHANNEL.recv() { match event { Event::Exit { span_name, elapsed } => { inner_histograms .lock() .entry(span_name) .or_insert( Histogram::new_with_bounds(1, 1_000_000_000, sigfig).unwrap(), ) .record(elapsed); } _ => {} } } } }); Self { histograms, worker_flag, worker_handle: Some(worker_handle), } } } impl Drop for Metrics { fn drop(&mut self) { self.worker_flag.store(false, Ordering::Relaxed); self.worker_handle.take().unwrap().join().unwrap(); } }