mirror of https://github.com/fralalonde/dipstick
128 lines
4.1 KiB
Rust
Executable File
128 lines
4.1 KiB
Rust
Executable File
//! Queue metrics for write on a separate thread,
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//! RawMetrics definitions are still synchronous.
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//! If queue size is exceeded, calling code reverts to blocking.
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use core::{Value, RawMetric, Name, Kind, Marker, WithName, RawOutputDyn,
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WithAttributes, Attributes, Input, Output, Metric, UnsafeInput};
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use bucket::Bucket;
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use error;
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use self_metrics::DIPSTICK_METRICS;
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use std::sync::Arc;
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use std::sync::mpsc;
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use std::thread;
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metrics!{
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<Bucket> DIPSTICK_METRICS.add_prefix("raw_async_queue") => {
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/// Maybe queue was full?
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Marker SEND_FAILED: "send_failed";
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}
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}
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fn new_async_channel(length: usize) -> Arc<mpsc::SyncSender<RawQueueCmd>> {
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let (sender, receiver) = mpsc::sync_channel::<RawQueueCmd>(length);
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thread::spawn(move || {
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let mut done = false;
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while !done {
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match receiver.recv() {
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Ok(RawQueueCmd::Write(wfn, value)) => wfn.write(value),
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Ok(RawQueueCmd::Flush(input)) => if let Err(e) = input.flush_raw() {
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debug!("Could not asynchronously flush metrics: {}", e);
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},
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Err(e) => {
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debug!("Async metrics receive loop terminated: {}", e);
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// cannot break from within match, use safety pin instead
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done = true
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}
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}
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}
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});
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Arc::new(sender)
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}
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/// Wrap new inputs with an asynchronous metric write & flush dispatcher.
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#[derive(Clone)]
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pub struct QueueRawOutput {
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attributes: Attributes,
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target: Arc<RawOutputDyn + Send + Sync + 'static>,
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sender: Arc<mpsc::SyncSender<RawQueueCmd>>,
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}
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impl QueueRawOutput {
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/// Wrap new inputs with an asynchronous metric write & flush dispatcher.
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pub fn new<OUT: RawOutputDyn + Send + Sync + 'static>(target: OUT, queue_length: usize) -> Self {
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QueueRawOutput {
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attributes: Attributes::default(),
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target: Arc::new(target),
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sender: new_async_channel(queue_length),
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}
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}
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}
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impl WithAttributes for QueueRawOutput {
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fn get_attributes(&self) -> &Attributes { &self.attributes }
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fn mut_attributes(&mut self) -> &mut Attributes { &mut self.attributes }
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}
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impl Output for QueueRawOutput {
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type INPUT = QueueRawInput;
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/// Wrap new inputs with an asynchronous metric write & flush dispatcher.
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fn new_input(&self) -> Self::INPUT {
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let target_input = UnsafeInput::new(self.target.new_raw_input_dyn());
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QueueRawInput {
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attributes: self.attributes.clone(),
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sender: self.sender.clone(),
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target: Arc::new(target_input),
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}
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}
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}
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/// This is only `pub` because `error` module needs to know about it.
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/// Async commands should be of no concerns to applications.
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pub enum RawQueueCmd {
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Write(Arc<RawMetric>, Value),
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Flush(Arc<UnsafeInput>),
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}
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/// A metric input wrapper that sends writes & flushes over a Rust sync channel.
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/// Commands are executed by a background thread.
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#[derive(Clone)]
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pub struct QueueRawInput {
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attributes: Attributes,
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sender: Arc<mpsc::SyncSender<RawQueueCmd>>,
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target: Arc<UnsafeInput>,
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}
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impl WithAttributes for QueueRawInput {
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fn get_attributes(&self) -> &Attributes { &self.attributes }
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fn mut_attributes(&mut self) -> &mut Attributes { &mut self.attributes }
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}
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impl Input for QueueRawInput {
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fn new_metric(&self, name: Name, kind:Kind) -> Metric {
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let name = self.qualified_name(name);
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let target_metric = Arc::new(self.target.new_metric_raw(name, kind));
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let sender = self.sender.clone();
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Metric::new(move |value| {
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if let Err(e) = sender.send(RawQueueCmd::Write(target_metric.clone(), value)) {
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SEND_FAILED.mark();
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debug!("Failed to send async metrics: {}", e);
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}
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})
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}
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fn flush(&self) -> error::Result<()> {
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if let Err(e) = self.sender.send(RawQueueCmd::Flush(self.target.clone())) {
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SEND_FAILED.mark();
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debug!("Failed to flush async metrics: {}", e);
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Err(e.into())
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} else {
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Ok(())
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}
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}
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}
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