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use crate::io::MultiLineWriter;
use crate::sinks::core::MetricSink;
use std::io::{self, Write};
use std::sync::{Arc, Mutex};
use std::fmt::{self, Debug, Formatter};
use std::panic::RefUnwindSafe;
const DEFAULT_BUFFER_SIZE: usize = 512;
#[derive(Clone)]
struct SpyWriter {
inner: Arc<Mutex<dyn Write + Send + RefUnwindSafe + 'static>>,
}
impl SpyWriter {
fn from(inner: Arc<Mutex<dyn Write + Send + RefUnwindSafe + 'static>>) -> Self {
SpyWriter { inner }
}
}
impl Write for SpyWriter {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
let mut writer = self.inner.lock().unwrap();
writer.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
let mut writer = self.inner.lock().unwrap();
writer.flush()
}
}
pub struct SpyMetricSink {
writer: Mutex<SpyWriter>,
}
impl SpyMetricSink {
pub fn from(writer: Arc<Mutex<dyn Write + Send + RefUnwindSafe + 'static>>) -> Self {
SpyMetricSink {
writer: Mutex::new(SpyWriter::from(writer))
}
}
}
impl MetricSink for SpyMetricSink {
fn emit(&self, metric: &str) -> io::Result<usize> {
let mut writer = self.writer.lock().unwrap();
writer.write(metric.as_bytes())
}
}
impl Debug for SpyMetricSink {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(f, "SpyMetricSink {{ Mutex {{ SpyWriter {{ ... }} }} }}")
}
}
pub struct BufferedSpyMetricSink {
writer: Mutex<MultiLineWriter<SpyWriter>>,
}
impl BufferedSpyMetricSink {
pub fn from(writer: Arc<Mutex<dyn Write + Send + RefUnwindSafe + 'static>>) -> Self {
Self::with_capacity(writer, DEFAULT_BUFFER_SIZE)
}
pub fn with_capacity(writer: Arc<Mutex<dyn Write + Send + RefUnwindSafe + 'static>>, cap: usize) -> Self {
BufferedSpyMetricSink {
writer: Mutex::new(MultiLineWriter::new(
SpyWriter::from(writer),
cap,
))
}
}
}
impl MetricSink for BufferedSpyMetricSink {
fn emit(&self, metric: &str) -> io::Result<usize> {
let mut writer = self.writer.lock().unwrap();
writer.write(metric.as_bytes())
}
fn flush(&self) -> io::Result<()> {
let mut writer = self.writer.lock().unwrap();
writer.flush()
}
}
impl Debug for BufferedSpyMetricSink {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "BufferedSpyMetricSink {{ Mutex {{ MultiLineWriter {{ SpyWriter {{ ... }} }} }} }}")
}
}
#[cfg(test)]
mod test {
use std::sync::{Arc, Mutex};
use super::{BufferedSpyMetricSink, MetricSink, SpyMetricSink};
#[inline]
fn copy_buffer(writer: Arc<Mutex<Vec<u8>>>) -> Vec<u8> {
writer.lock().unwrap().clone()
}
#[test]
fn test_spy_metric_sink() {
let writer = Arc::new(Mutex::new(Vec::new()));
let sink = SpyMetricSink::from(writer.clone());
sink.emit("buz:1|c").unwrap();
let contents = copy_buffer(writer);
assert_eq!("buz:1|c".as_bytes(), contents.as_slice());
}
#[test]
fn test_buffered_spy_metric_sink() {
let writer = Arc::new(Mutex::new(Vec::new()));
{
let sink = BufferedSpyMetricSink::with_capacity(writer.clone(), 16);
sink.emit("foo:54|c").unwrap();
sink.emit("foo:67|c").unwrap();
}
let contents = copy_buffer(writer);
assert_eq!("foo:54|c\nfoo:67|c\n".as_bytes(), contents.as_slice());
}
#[test]
fn test_buffered_spy_metric_sink_flush() {
let writer = Arc::new(Mutex::new(Vec::new()));
let sink = BufferedSpyMetricSink::with_capacity(writer.clone(), 64);
sink.emit("foo:54|c").unwrap();
sink.emit("foo:67|c").unwrap();
let flush = sink.flush();
let contents = copy_buffer(writer);
assert_eq!("foo:54|c\nfoo:67|c\n".as_bytes(), contents.as_slice());
assert!(flush.is_ok());
}
}