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use core::attributes::{Attributes, WithAttributes, Prefixed};
use core::name::MetricName;
use core::input::{InputKind, Input, InputScope, InputDyn, InputMetric};
use core::{MetricValue, Flush};
use core::metrics;
use cache::cache_in::CachedInput;
use core::error;
use core::label::Labels;
use std::sync::Arc;
use std::sync::mpsc;
use std::thread;
pub trait QueuedInput: Input + Send + Sync + 'static + Sized {
fn queued(self, max_size: usize) -> InputQueue {
InputQueue::new(self, max_size)
}
}
fn new_async_channel(length: usize) -> Arc<mpsc::SyncSender<InputQueueCmd>> {
let (sender, receiver) = mpsc::sync_channel::<InputQueueCmd>(length);
thread::Builder::new()
.name("dipstick-queue-in".to_string())
.spawn(move || {
let mut done = false;
while !done {
match receiver.recv() {
Ok(InputQueueCmd::Write(metric, value, labels)) => metric.write(value, labels),
Ok(InputQueueCmd::Flush(scope)) => if let Err(e) = scope.flush() {
debug!("Could not asynchronously flush metrics: {}", e);
},
Err(e) => {
debug!("Async metrics receive loop terminated: {}", e);
done = true
}
}
}
})
.unwrap();
Arc::new(sender)
}
#[derive(Clone)]
pub struct InputQueue {
attributes: Attributes,
target: Arc<InputDyn + Send + Sync + 'static>,
sender: Arc<mpsc::SyncSender<InputQueueCmd>>,
}
impl InputQueue {
pub fn new<OUT: Input + Send + Sync + 'static>(target: OUT, queue_length: usize) -> Self {
InputQueue {
attributes: Attributes::default(),
target: Arc::new(target),
sender: new_async_channel(queue_length),
}
}
}
impl CachedInput for InputQueue {}
impl WithAttributes for InputQueue {
fn get_attributes(&self) -> &Attributes { &self.attributes }
fn mut_attributes(&mut self) -> &mut Attributes { &mut self.attributes }
}
impl Input for InputQueue {
type SCOPE = InputQueueScope;
fn input(&self) -> Self::SCOPE {
let target_scope = self.target.input_dyn();
InputQueueScope {
attributes: self.attributes.clone(),
sender: self.sender.clone(),
target: target_scope,
}
}
}
pub enum InputQueueCmd {
Write(InputMetric, MetricValue, Labels),
Flush(Arc<InputScope + Send + Sync + 'static>),
}
#[derive(Clone)]
pub struct InputQueueScope {
attributes: Attributes,
sender: Arc<mpsc::SyncSender<InputQueueCmd>>,
target: Arc<InputScope + Send + Sync + 'static>,
}
impl InputQueueScope {
pub fn wrap<SC: InputScope + Send + Sync + 'static>(target_scope: SC, queue_length: usize) -> Self {
InputQueueScope {
attributes: Attributes::default(),
sender: new_async_channel(queue_length),
target: Arc::new(target_scope),
}
}
}
impl WithAttributes for InputQueueScope {
fn get_attributes(&self) -> &Attributes { &self.attributes }
fn mut_attributes(&mut self) -> &mut Attributes { &mut self.attributes }
}
impl InputScope for InputQueueScope {
fn new_metric(&self, name: MetricName, kind: InputKind) -> InputMetric {
let name = self.prefix_append(name);
let target_metric = self.target.new_metric(name, kind);
let sender = self.sender.clone();
InputMetric::new(move |value, mut labels| {
labels.save_context();
if let Err(e) = sender.send(InputQueueCmd::Write(target_metric.clone(), value, labels)) {
metrics::SEND_FAILED.mark();
debug!("Failed to send async metrics: {}", e);
}
})
}
}
impl Flush for InputQueueScope {
fn flush(&self) -> error::Result<()> {
if let Err(e) = self.sender.send(InputQueueCmd::Flush(self.target.clone())) {
metrics::SEND_FAILED.mark();
debug!("Failed to flush async metrics: {}", e);
Err(e.into())
} else {
Ok(())
}
}
}