mirror of https://github.com/fralalonde/dipstick
172 lines
5.1 KiB
Rust
172 lines
5.1 KiB
Rust
//! Send metrics to a graphite server.
|
|
|
|
use core::*;
|
|
use scope_metrics::*;
|
|
use error;
|
|
use self_metrics::*;
|
|
|
|
use std::net::ToSocketAddrs;
|
|
|
|
use std::sync::{Arc, RwLock};
|
|
use std::time::{SystemTime, UNIX_EPOCH};
|
|
use std::io::Write;
|
|
use std::fmt::Debug;
|
|
|
|
use socket::RetrySocket;
|
|
|
|
mod_metrics!(Aggregate, GRAPHITE_METRICS = DIPSTICK_METRICS.with_prefix("graphite"));
|
|
mod_marker!(Aggregate, GRAPHITE_METRICS, {
|
|
SEND_ERR: "send_failed",
|
|
TRESHOLD_EXCEEDED: "bufsize_exceeded",
|
|
});
|
|
mod_counter!(Aggregate, GRAPHITE_METRICS, { SENT_BYTES: "sent_bytes" });
|
|
|
|
|
|
/// Send metrics to a graphite server at the address and port provided.
|
|
pub fn to_graphite<ADDR>(address: ADDR) -> error::Result<ScopeMetrics<Graphite>>
|
|
where
|
|
ADDR: ToSocketAddrs + Debug + Clone,
|
|
{
|
|
debug!("Connecting to graphite {:?}", address);
|
|
let socket = Arc::new(RwLock::new(RetrySocket::new(address.clone())?));
|
|
Ok(ScopeMetrics::new(
|
|
move |kind, name, rate| {
|
|
let mut prefix = String::with_capacity(32);
|
|
prefix.push_str(name);
|
|
prefix.push(' ');
|
|
|
|
let mut scale = match kind {
|
|
// timers are in µs, lets give graphite milliseconds for consistency with statsd
|
|
Kind::Timer => 1000,
|
|
_ => 1,
|
|
};
|
|
|
|
if rate < FULL_SAMPLING_RATE {
|
|
// graphite does not do sampling, so we'll upsample before sending
|
|
let upsample = (1.0 / rate).round() as u64;
|
|
warn!(
|
|
"Metric {:?} '{}' being sampled at rate {} will be upsampled \
|
|
by a factor of {} when sent to graphite.",
|
|
kind, name, rate, upsample
|
|
);
|
|
scale = scale * upsample;
|
|
}
|
|
|
|
Graphite { prefix, scale }
|
|
},
|
|
move |buffered| {
|
|
let buf = ScopeBuffer {
|
|
buffer: Arc::new(RwLock::new(String::new())),
|
|
socket: socket.clone(),
|
|
buffered,
|
|
};
|
|
control_scope(move |cmd| match cmd {
|
|
ScopeCmd::Write(metric, value) => buf.write(metric, value),
|
|
ScopeCmd::Flush => buf.flush(),
|
|
})
|
|
},
|
|
))
|
|
}
|
|
|
|
/// Its hard to see how a single scope could get more metrics than this.
|
|
// TODO make configurable?
|
|
const BUFFER_FLUSH_THRESHOLD: usize = 65_536;
|
|
|
|
/// Key of a graphite metric.
|
|
#[derive(Debug, Clone)]
|
|
pub struct Graphite {
|
|
prefix: String,
|
|
scale: u64,
|
|
}
|
|
|
|
/// Wrap string buffer & socket as one.
|
|
#[derive(Debug)]
|
|
struct ScopeBuffer {
|
|
buffer: Arc<RwLock<String>>,
|
|
socket: Arc<RwLock<RetrySocket>>,
|
|
buffered: bool,
|
|
}
|
|
|
|
/// Any remaining buffered data is flushed on Drop.
|
|
impl Drop for ScopeBuffer {
|
|
fn drop(&mut self) {
|
|
self.flush()
|
|
}
|
|
}
|
|
|
|
impl ScopeBuffer {
|
|
fn write(&self, metric: &Graphite, value: Value) {
|
|
let scaled_value = value / metric.scale;
|
|
let value_str = scaled_value.to_string();
|
|
|
|
let start = SystemTime::now();
|
|
match start.duration_since(UNIX_EPOCH) {
|
|
Ok(timestamp) => {
|
|
let mut buf = self.buffer.write().expect("Locking graphite buffer");
|
|
|
|
buf.push_str(&metric.prefix);
|
|
buf.push_str(&value_str);
|
|
buf.push(' ');
|
|
buf.push_str(timestamp.as_secs().to_string().as_ref());
|
|
buf.push('\n');
|
|
|
|
if buf.len() > BUFFER_FLUSH_THRESHOLD {
|
|
TRESHOLD_EXCEEDED.mark();
|
|
warn!(
|
|
"Flushing metrics scope buffer to graphite because its size exceeds \
|
|
the threshold of {} bytes. ",
|
|
BUFFER_FLUSH_THRESHOLD
|
|
);
|
|
self.flush_inner(&mut buf);
|
|
} else if !self.buffered {
|
|
self.flush_inner(&mut buf);
|
|
}
|
|
}
|
|
Err(e) => {
|
|
warn!("Could not compute epoch timestamp. {}", e);
|
|
}
|
|
};
|
|
}
|
|
|
|
fn flush_inner(&self, buf: &mut String) {
|
|
if !buf.is_empty() {
|
|
let mut sock = self.socket.write().expect("Locking graphite socket");
|
|
match sock.write(buf.as_bytes()) {
|
|
Ok(size) => {
|
|
buf.clear();
|
|
SENT_BYTES.count(size);
|
|
trace!("Sent {} bytes to graphite", buf.len());
|
|
}
|
|
Err(e) => {
|
|
SEND_ERR.mark();
|
|
// still just a best effort, do not warn! for every failure
|
|
debug!("Failed to send buffer to graphite: {}", e);
|
|
}
|
|
};
|
|
buf.clear();
|
|
}
|
|
}
|
|
|
|
fn flush(&self) {
|
|
let mut buf = self.buffer.write().expect("Locking graphite buffer");
|
|
self.flush_inner(&mut buf);
|
|
}
|
|
}
|
|
|
|
#[cfg(feature = "bench")]
|
|
mod bench {
|
|
|
|
use super::*;
|
|
use test;
|
|
|
|
#[bench]
|
|
pub fn timer_graphite(b: &mut test::Bencher) {
|
|
let sd = to_graphite("localhost:8125").unwrap();
|
|
let timer = sd.define_metric(Kind::Timer, "timer", 1000000.0);
|
|
let scope = sd.open_scope(false);
|
|
|
|
b.iter(|| test::black_box(scope.write(&timer, 2000)));
|
|
}
|
|
|
|
}
|