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use crate::{
common::{
Delta, MetricIdentifier, MetricKind, MetricName, MetricScope, MetricScopeHandle,
MetricValue,
},
data::{Counter, Gauge, Histogram},
registry::{MetricRegistry, ScopeRegistry},
};
use fxhash::FxBuildHasher;
use quanta::Clock;
use std::error::Error;
use std::fmt;
use std::sync::Arc;
type FastHashMap<K, V> = hashbrown::HashMap<K, V, FxBuildHasher>;
#[derive(Debug, Clone)]
pub enum SinkError {
InvalidScope,
}
impl Error for SinkError {}
impl fmt::Display for SinkError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
SinkError::InvalidScope => write!(f, "given scope is invalid"),
}
}
}
pub trait AsScoped<'a> {
fn as_scoped(&'a self, base: MetricScope) -> MetricScope;
}
pub struct Sink {
metric_registry: Arc<MetricRegistry>,
metric_cache: FastHashMap<MetricIdentifier, MetricValue>,
scope_registry: Arc<ScopeRegistry>,
scope: MetricScope,
scope_handle: MetricScopeHandle,
clock: Clock,
}
impl Sink {
pub(crate) fn new(
metric_registry: Arc<MetricRegistry>,
scope_registry: Arc<ScopeRegistry>,
scope: MetricScope,
clock: Clock,
) -> Sink {
let scope_handle = scope_registry.register(scope.clone());
Sink {
metric_registry,
metric_cache: FastHashMap::default(),
scope_registry,
scope,
scope_handle,
clock,
}
}
pub fn scoped<'a, S: AsScoped<'a> + ?Sized>(&self, scope: &'a S) -> Sink {
let new_scope = scope.as_scoped(self.scope.clone());
Sink::new(
self.metric_registry.clone(),
self.scope_registry.clone(),
new_scope,
self.clock.clone(),
)
}
pub fn now(&self) -> u64 {
self.clock.now()
}
pub fn record_count<N: Into<MetricName>>(&mut self, name: N, value: u64) {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Counter);
let value_handle = self.get_cached_value_handle(identifier);
value_handle.update_counter(value);
}
pub fn record_gauge<N: Into<MetricName>>(&mut self, name: N, value: i64) {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Gauge);
let value_handle = self.get_cached_value_handle(identifier);
value_handle.update_gauge(value);
}
pub fn record_timing<N: Into<MetricName>, V: Delta>(&mut self, name: N, start: V, end: V) {
let value = end.delta(start);
self.record_value(name, value);
}
pub fn record_value<N: Into<MetricName>>(&mut self, name: N, value: u64) {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Histogram);
let value_handle = self.get_cached_value_handle(identifier);
value_handle.update_histogram(value);
}
pub fn counter<N: Into<MetricName>>(&mut self, name: N) -> Counter {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Counter);
self.get_cached_value_handle(identifier).clone().into()
}
pub fn gauge<N: Into<MetricName>>(&mut self, name: N) -> Gauge {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Gauge);
self.get_cached_value_handle(identifier).clone().into()
}
pub fn histogram<N: Into<MetricName>>(&mut self, name: N) -> Histogram {
let identifier =
MetricIdentifier::Unlabeled(name.into(), self.scope_handle, MetricKind::Histogram);
self.get_cached_value_handle(identifier).clone().into()
}
fn get_cached_value_handle(&mut self, identifier: MetricIdentifier) -> &MetricValue {
if let Some(handle) = self.metric_cache.get(&identifier) {
return unsafe { &*(handle as *const MetricValue) };
}
let handle = self.metric_registry.get_value_handle(identifier.clone());
self.metric_cache.insert(identifier.clone(), handle);
self.metric_cache.get(&identifier).unwrap()
}
}
impl Clone for Sink {
fn clone(&self) -> Sink {
Sink {
metric_registry: self.metric_registry.clone(),
metric_cache: self.metric_cache.clone(),
scope_registry: self.scope_registry.clone(),
scope: self.scope.clone(),
scope_handle: self.scope_handle,
clock: self.clock.clone(),
}
}
}
impl<'a> AsScoped<'a> for str {
fn as_scoped(&'a self, base: MetricScope) -> MetricScope {
match base {
MetricScope::Root => {
let parts = vec![self.to_owned()];
MetricScope::Nested(parts)
}
MetricScope::Nested(mut parts) => {
parts.push(self.to_owned());
MetricScope::Nested(parts)
}
}
}
}
impl<'a, 'b, T> AsScoped<'a> for T
where
&'a T: AsRef<[&'b str]>,
T: 'a,
{
fn as_scoped(&'a self, base: MetricScope) -> MetricScope {
match base {
MetricScope::Root => {
let parts = self.as_ref().iter().map(|s| s.to_string()).collect();
MetricScope::Nested(parts)
}
MetricScope::Nested(mut parts) => {
let mut new_parts = self.as_ref().iter().map(|s| s.to_string()).collect();
parts.append(&mut new_parts);
MetricScope::Nested(parts)
}
}
}
}