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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
use inherent::inherent;
use std::sync::Arc;
use super::{CommonMetricData, MetricId};
use glean::{DistributionData, ErrorType, HistogramType};
use crate::ipc::{need_ipc, with_ipc_payload};
use glean::traits::CustomDistribution;
#[cfg(feature = "with_gecko")]
use super::profiler_utils::{
truncate_vector_for_marker, DistributionMetricMarker, DistributionValues,
};
#[cfg(feature = "with_gecko")]
use gecko_profiler::{gecko_profiler_category, MarkerOptions};
/// A custom distribution metric.
///
/// Custom distributions are used to record the distribution of arbitrary values.
#[derive(Clone)]
pub enum CustomDistributionMetric {
Parent {
/// The metric's ID.
///
/// **TEST-ONLY** - Do not use unless gated with `#[cfg(test)]`.
id: MetricId,
inner: Arc<glean::private::CustomDistributionMetric>,
},
Child(CustomDistributionMetricIpc),
}
#[derive(Debug, Clone)]
pub struct CustomDistributionMetricIpc(pub MetricId);
impl CustomDistributionMetric {
/// Create a new custom distribution metric.
pub fn new(
id: MetricId,
meta: CommonMetricData,
range_min: i64,
range_max: i64,
bucket_count: i64,
histogram_type: HistogramType,
) -> Self {
if need_ipc() {
CustomDistributionMetric::Child(CustomDistributionMetricIpc(id))
} else {
let inner = glean::private::CustomDistributionMetric::new(
meta,
range_min,
range_max,
bucket_count,
histogram_type,
);
CustomDistributionMetric::Parent {
id,
inner: Arc::new(inner),
}
}
}
#[cfg(test)]
pub(crate) fn metric_id(&self) -> MetricId {
match self {
CustomDistributionMetric::Parent { id, .. } => *id,
CustomDistributionMetric::Child(c) => c.0,
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
CustomDistributionMetric::Parent { id, .. } => {
CustomDistributionMetric::Child(CustomDistributionMetricIpc(*id))
}
CustomDistributionMetric::Child(_) => {
panic!("Can't get a child metric from a child metric")
}
}
}
pub fn start_buffer(&self) -> LocalCustomDistribution<'_> {
match self {
CustomDistributionMetric::Parent { inner, .. } => {
LocalCustomDistribution::Parent(inner.start_buffer())
}
CustomDistributionMetric::Child(_) => {
// want to panic though.
log::warn!("Can't get a local custom distribution from a child metric. No data will be recorded.");
LocalCustomDistribution::Child
}
}
}
}
pub enum LocalCustomDistribution<'a> {
Parent(glean::private::LocalCustomDistribution<'a>),
Child,
}
impl LocalCustomDistribution<'_> {
pub fn accumulate(&mut self, sample: u64) {
match self {
LocalCustomDistribution::Parent(p) => p.accumulate(sample),
LocalCustomDistribution::Child => {
log::debug!("Can't accumulate local custom distribution in a child process.")
}
}
}
}
#[inherent]
impl CustomDistribution for CustomDistributionMetric {
pub fn accumulate_samples_signed(&self, samples: Vec<i64>) {
#[cfg(feature = "with_gecko")]
let marker_samples = truncate_vector_for_marker(&samples);
#[allow(unused)]
let id = match self {
CustomDistributionMetric::Parent { id, inner } => {
inner.accumulate_samples(samples);
*id
}
CustomDistributionMetric::Child(c) => {
with_ipc_payload(move |payload| {
if let Some(v) = payload.custom_samples.get_mut(&c.0) {
v.extend(samples);
} else {
payload.custom_samples.insert(c.0, samples);
}
});
c.0
}
};
#[cfg(feature = "with_gecko")]
if gecko_profiler::can_accept_markers() {
gecko_profiler::add_marker(
"CustomDistribution::accumulate",
gecko_profiler_category!(Telemetry),
MarkerOptions::default(),
DistributionMetricMarker::new(
id,
None,
DistributionValues::Samples(marker_samples),
),
);
}
}
pub fn accumulate_single_sample_signed(&self, sample: i64) {
#[allow(unused)]
let id = match self {
CustomDistributionMetric::Parent { id, inner } => {
inner.accumulate_single_sample(sample);
*id
}
CustomDistributionMetric::Child(c) => {
with_ipc_payload(move |payload| {
if let Some(v) = payload.custom_samples.get_mut(&c.0) {
v.push(sample);
} else {
payload.custom_samples.insert(c.0, vec![sample]);
}
});
c.0
}
};
#[cfg(feature = "with_gecko")]
if gecko_profiler::can_accept_markers() {
gecko_profiler::add_marker(
"CustomDistribution::accumulate",
gecko_profiler_category!(Telemetry),
MarkerOptions::default(),
DistributionMetricMarker::new(id, None, DistributionValues::Sample(sample)),
);
}
}
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(
&self,
ping_name: S,
) -> Option<DistributionData> {
let ping_name = ping_name.into().map(|s| s.to_string());
match self {
CustomDistributionMetric::Parent { inner, .. } => inner.test_get_value(ping_name),
CustomDistributionMetric::Child(c) => {
panic!("Cannot get test value for {:?} in non-parent process!", c)
}
}
}
pub fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32 {
match self {
CustomDistributionMetric::Parent { inner, .. } => {
inner.test_get_num_recorded_errors(error)
}
CustomDistributionMetric::Child(c) => panic!(
"Cannot get number of recorded errors for {:?} in non-parent process!",
c
),
}
}
}
#[cfg(test)]
mod test {
use crate::{common_test::*, ipc, metrics};
#[test]
fn smoke_test_custom_distribution() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::a_custom_dist;
metric.accumulate_samples_signed(vec![1, 2, 3]);
assert!(metric.test_get_value("store1").is_some());
}
#[test]
fn custom_distribution_child() {
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::a_custom_dist;
parent_metric.accumulate_samples_signed(vec![1, 268435458]);
{
let child_metric = parent_metric.child_metric();
// scope for need_ipc RAII
let _raii = ipc::test_set_need_ipc(true);
child_metric.accumulate_samples_signed(vec![4, 268435460]);
}
let buf = ipc::take_buf().unwrap();
assert!(buf.len() > 0);
assert!(ipc::replay_from_buf(&buf).is_ok());
let data = parent_metric
.test_get_value("store1")
.expect("should have some data");
assert_eq!(2, data.values[&1], "Low bucket has 2 values");
assert_eq!(
2, data.values[&268435456],
"Next higher bucket has 2 values"
);
assert_eq!(
1 + 4 + 268435458 + 268435460,
data.sum,
"Sum of all recorded values"
);
}
}