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use chrono::prelude::*;
use crossbeam_channel::*;
use holochain_locksmith::RwLock;
use std::sync::Arc;
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct Metric {
pub name: String,
pub stream_id: Option<String>,
pub timestamp: Option<DateTime<Utc>>,
pub value: f64,
}
impl Metric {
pub fn new<S: Into<String>, S2: Into<Option<String>>>(
name: S,
stream_id: S2,
timestamp: Option<DateTime<Utc>>,
value: f64,
) -> Self {
Self {
name: name.into(),
stream_id: stream_id.into(),
timestamp,
value,
}
}
pub fn new_timestamped_now<S: Into<String>, S2: Into<Option<String>>>(
name: S,
stream_id: S2,
value: f64,
) -> Self {
Self {
name: name.into(),
stream_id: stream_id.into(),
timestamp: Some(Utc::now()),
value,
}
}
}
#[macro_export]
macro_rules! metrics_from_reader {
($read: expr) => {{
$read.deserialize().map(|record| {
let metric: Metric = record.unwrap();
metric
})
}};
}
pub trait MetricPublisher: Sync + Send {
fn publish(&mut self, metric: &Metric);
}
pub struct ChannelPublisher {
sender: Sender<Metric>,
}
impl ChannelPublisher {
pub fn new(mut metric_publisher: Box<dyn MetricPublisher>) -> Self {
let (sender, receiver) = unbounded();
let _join_handle: std::thread::JoinHandle<()> = std::thread::spawn(move || loop {
match receiver.try_recv() {
Ok(metric) => metric_publisher.publish(&metric),
Err(TryRecvError::Disconnected) => break,
Err(_) => (),
}
});
Self { sender }
}
}
impl MetricPublisher for ChannelPublisher {
fn publish(&mut self, metric: &Metric) {
self.sender.send(metric.clone()).unwrap();
}
}
pub type DefaultMetricPublisher = crate::logger::LoggerMetricPublisher;
#[macro_export]
macro_rules! with_latency_publishing {
($metric_prefix:expr, $publisher:expr, $f:expr) => {{
let clock = std::time::SystemTime::now();
let ret = $f();
let latency = clock.elapsed().unwrap().as_millis();
if latency == 0 {
ret
} else {
let metric_name = format!("{}.latency", $metric_prefix);
let metric = $crate::Metric::new(metric_name.as_str(), None,
Some(clock.into()), latency as f64);
$publisher.write().unwrap().publish(&metric);
ret
}
}};
($metric_prefix:expr, $publisher:expr, $f:expr, $($args:expr),+ ) => {{
let clock = std::time::SystemTime::now();
let ret = ($f)($($args),+);
let latency = clock.elapsed().unwrap().as_millis();
if latency == 0 {
ret
} else {
let metric_name = format!("{}.latency", $metric_prefix);
let metric = $crate::Metric::new(metric_name.as_str(), None,
Some(clock.into()), latency as f64);
$publisher.write().unwrap().publish(&metric);
ret
}
}}
}
pub struct MetricPublishers(Vec<Arc<RwLock<dyn MetricPublisher>>>);
impl MetricPublisher for MetricPublishers {
fn publish(&mut self, metric: &Metric) {
for publisher in &self.0 {
publisher.write().unwrap().publish(&metric);
}
}
}
impl MetricPublishers {
pub fn new(publishers: Vec<Arc<RwLock<dyn MetricPublisher>>>) -> Self {
MetricPublishers(publishers)
}
pub fn empty() -> Self {
Self::new(vec![])
}
}
impl Default for MetricPublishers {
fn default() -> Self {
let publishers = vec![
crate::config::MetricPublisherConfig::default_logger().create_metric_publisher(),
crate::config::MetricPublisherConfig::default_cloudwatch_logs()
.create_metric_publisher(),
];
Self(publishers)
}
}
#[cfg(test)]
mod test {
use super::*;
use std::sync::{Arc, RwLock};
#[test]
fn can_publish_to_logger() {
let mut publisher = crate::logger::LoggerMetricPublisher;
let timestamp = Utc.timestamp(1_500_000_000, 0);
let metric = Metric::new("latency", None, Some(timestamp), 100.0);
publisher.publish(&metric);
}
fn test_latency_fn(x: bool) -> bool {
x
}
#[test]
fn can_publish_latencies() {
let publisher = Arc::new(RwLock::new(crate::logger::LoggerMetricPublisher));
let ret = with_latency_publishing!("test", publisher, test_latency_fn, true);
assert!(ret)
}
}