mirror of https://github.com/fralalonde/dipstick
246 lines
8.3 KiB
Rust
Executable File
246 lines
8.3 KiB
Rust
Executable File
//! Decouple metric definition from configuration with trait objects.
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use core::{Name, WithName, Kind, Input, Metric, NO_METRIC_OUTPUT, WithAttributes, Attributes};
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use error;
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use std::collections::{HashMap, BTreeMap};
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use std::sync::{Arc, RwLock, Weak};
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use std::fmt;
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use atomic_refcell::*;
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lazy_static! {
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/// Root of the default metrics proxy, usable by all libraries and apps.
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/// Libraries should create their metrics into sub subspaces of this.
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/// Applications should configure on startup where the proxyed metrics should go.
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/// Exceptionally, one can create its own InputProxy root, separate from this one.
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pub static ref ROOT_PROXY: InputProxy = InputProxy::new();
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}
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/// Return the root metric proxy.
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pub fn input_proxy() -> InputProxy {
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ROOT_PROXY.clone()
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}
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/// A dynamically proxyed metric.
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#[derive(Debug)]
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struct ProxiedMetric {
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// basic info for this metric, needed to recreate new corresponding trait object if target changes
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name: Name,
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kind: Kind,
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// the metric trait object to proxy metric values to
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// the second part can be up to namespace.len() + 1 if this metric was individually targeted
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// 0 if no target assigned
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target: (AtomicRefCell<(Metric, usize)>),
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// a reference to the the parent proxyer to remove the metric from when it is dropped
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proxy: Arc<RwLock<InnerProxy>>,
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}
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/// Dispatcher weak ref does not prevent dropping but still needs to be cleaned out.
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impl Drop for ProxiedMetric {
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fn drop(&mut self) {
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self.proxy.write().expect("Dispatch Lock").drop_metric(&self.name)
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}
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}
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/// A dynamic proxy point for app and lib metrics.
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/// Decouples metrics definition from backend configuration.
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/// Allows defining metrics before a concrete type has been selected.
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/// Allows replacing metrics backend on the fly at runtime.
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#[derive(Clone, Debug)]
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pub struct InputProxy {
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attributes: Attributes,
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inner: Arc<RwLock<InnerProxy>>,
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}
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struct InnerProxy {
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// namespaces can target one, many or no metrics
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targets: HashMap<Name, Arc<Input + Send + Sync>>,
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// last part of the namespace is the metric's name
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metrics: BTreeMap<Name, Weak<ProxiedMetric>>,
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}
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impl fmt::Debug for InnerProxy {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "metrics: {:?}", self.metrics.keys())?;
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write!(f, "targets: {:?}", self.targets.keys())
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}
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}
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impl InnerProxy {
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fn new() -> Self {
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Self {
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targets: HashMap::new(),
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metrics: BTreeMap::new(),
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}
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}
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fn set_target(&mut self, target_name: Name, target_scope: Arc<Input + Send + Sync>) {
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self.targets.insert(target_name.clone(), target_scope.clone());
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for (metric_name, metric) in self.metrics.range_mut(target_name.clone()..) {
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if let Some(metric) = metric.upgrade() {
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// check for range end
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if !metric_name.starts_with(&target_name) { break }
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// check if metric targeted by _lower_ namespace
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if metric.target.borrow().1 > target_name.len() { continue }
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let target_metric = target_scope.new_metric(metric.name.clone(), metric.kind);
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*metric.target.borrow_mut() = (target_metric, target_name.len());
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}
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}
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}
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fn get_effective_target(&self, name: &Name) -> Option<(Arc<Input + Send + Sync>, usize)> {
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if let Some(target) = self.targets.get(name) {
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return Some((target.clone(), name.len()));
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}
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// no 1:1 match, scan upper namespaces
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let mut name = name.clone();
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while let Some(_popped) = name.pop() {
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if let Some(target) = self.targets.get(&name) {
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return Some((target.clone(), name.len()))
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}
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}
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None
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}
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fn unset_target(&mut self, namespace: &Name) {
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if self.targets.remove(namespace).is_none() {
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// nothing to do
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return
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}
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let (up_target, up_nslen) = self.get_effective_target(namespace)
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.unwrap_or_else(|| (NO_METRIC_OUTPUT.new_input_dyn(), 0));
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// update all affected metrics to next upper targeted namespace
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for (name, metric) in self.metrics.range_mut(namespace..) {
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// check for range end
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if !name.starts_with(namespace) { break }
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if let Some(mut metric) = metric.upgrade() {
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// check if metric targeted by _lower_ namespace
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if metric.target.borrow().1 > namespace.len() { continue }
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let new_metric = up_target.new_metric(name.clone(), metric.kind);
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*metric.target.borrow_mut() = (new_metric, up_nslen);
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}
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}
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}
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fn drop_metric(&mut self, name: &Name) {
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if self.metrics.remove(name).is_none() {
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panic!("Could not remove DelegatingMetric weak ref from delegation point")
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}
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}
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fn flush(&self, namespace: &Name) -> error::Result<()> {
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if let Some((target, _nslen)) = self.get_effective_target(namespace) {
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target.flush()
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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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impl InputProxy {
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/// Create a new "private" metric proxy root. This is usually not what you want.
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/// Since this proxy will not be part of the standard proxy tree,
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/// it will need to be configured independently and since downstream code may not know about
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/// its existence this may never happen and metrics will not be proxyed anywhere.
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/// If you want to use the standard proxy tree, use #metric_proxy() instead.
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pub fn new() -> Self {
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InputProxy {
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attributes: Attributes::default(),
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inner: Arc::new(RwLock::new(InnerProxy::new())),
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}
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}
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/// Replace target for this proxy and it's children.
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pub fn set_target<IS: Input + Send + Sync + 'static>(&self, target: IS) {
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let mut inner = self.inner.write().expect("Dispatch Lock");
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inner.set_target(self.get_namespace().clone(), Arc::new(target));
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}
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/// Replace target for this proxy and it's children.
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pub fn unset_target(&self) {
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let mut inner = self.inner.write().expect("Dispatch Lock");
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inner.unset_target(self.get_namespace());
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}
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}
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impl<S: AsRef<str>> From<S> for InputProxy {
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fn from(name: S) -> InputProxy {
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InputProxy::new().add_prefix(name.as_ref())
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}
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}
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impl Input for InputProxy {
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/// Lookup or create a proxy stub for the requested metric.
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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 mut inner = self.inner.write().expect("Dispatch Lock");
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let proxy = inner
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.metrics
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.get(&name)
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// TODO validate that Kind matches existing
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.and_then(|proxy_ref| Weak::upgrade(proxy_ref))
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.unwrap_or_else(|| {
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let name2 = name.clone();
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// not found, define new
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let (target, target_namespace_length) = inner.get_effective_target(&name)
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.unwrap_or_else(|| (NO_METRIC_OUTPUT.new_input_dyn(), 0));
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let metric_object = target.new_metric(name.clone(), kind);
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let proxy = Arc::new(ProxiedMetric {
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name,
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kind,
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target: AtomicRefCell::new((metric_object, target_namespace_length)),
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proxy: self.inner.clone(),
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});
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inner.metrics.insert(name2, Arc::downgrade(&proxy));
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proxy
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});
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Metric::new(move |value| proxy.target.borrow().0.write(value))
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}
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fn flush(&self) -> error::Result<()> {
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self.inner.write().expect("Dispatch Lock").flush(self.get_namespace())
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}
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}
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impl WithAttributes for InputProxy {
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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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#[cfg(feature = "bench")]
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mod bench {
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use core::*;
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use proxy::*;
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use test;
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use bucket::Bucket;
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#[bench]
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fn proxy_marker_to_aggregate(b: &mut test::Bencher) {
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ROOT_PROXY.set_target(Bucket::new());
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let metric = ROOT_PROXY.marker("event_a");
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b.iter(|| test::black_box(metric.mark()));
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}
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#[bench]
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fn proxy_marker_to_void(b: &mut test::Bencher) {
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let metric = ROOT_PROXY.marker("event_a");
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b.iter(|| test::black_box(metric.mark()));
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}
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}
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