Source code
Revision control
Copy as Markdown
Other Tools
// 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 super::CommonMetricData;
use glean::traits::Rate;
use crate::ipc::{need_ipc, with_ipc_payload};
use crate::private::MetricId;
/// Developer-facing API for recording rate metrics.
///
/// Instances of this class type are automatically generated by the parsers
/// at build time, allowing developers to record values that were previously
/// registered in the metrics.yaml file.
#[derive(Clone)]
pub enum RateMetric {
Parent {
/// The metric's ID.
///
/// **TEST-ONLY** - Do not use unless gated with `#[cfg(test)]`.
id: MetricId,
inner: glean::private::RateMetric,
},
Child(RateMetricIpc),
}
#[derive(Clone, Debug)]
pub struct RateMetricIpc(MetricId);
impl RateMetric {
/// The public constructor used by automatically generated metrics.
pub fn new(id: MetricId, meta: CommonMetricData) -> Self {
if need_ipc() {
RateMetric::Child(RateMetricIpc(id))
} else {
let inner = glean::private::RateMetric::new(meta);
RateMetric::Parent { id, inner }
}
}
#[cfg(test)]
pub(crate) fn metric_id(&self) -> MetricId {
match self {
RateMetric::Parent { id, .. } => *id,
RateMetric::Child(c) => c.0,
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
RateMetric::Parent { id, .. } => RateMetric::Child(RateMetricIpc(*id)),
RateMetric::Child(_) => panic!("Can't get a child metric from a child metric"),
}
}
}
#[inherent]
impl Rate for RateMetric {
pub fn add_to_numerator(&self, amount: i32) {
match self {
RateMetric::Parent { inner, .. } => {
inner.add_to_numerator(amount);
}
RateMetric::Child(c) => {
with_ipc_payload(move |payload| {
if let Some(r) = payload.rates.get_mut(&c.0) {
r.0 += amount;
} else {
payload.rates.insert(c.0, (amount, 0));
}
});
}
}
}
pub fn add_to_denominator(&self, amount: i32) {
match self {
RateMetric::Parent { inner, .. } => {
inner.add_to_denominator(amount);
}
RateMetric::Child(c) => {
with_ipc_payload(move |payload| {
if let Some(r) = payload.rates.get_mut(&c.0) {
r.1 += amount;
} else {
payload.rates.insert(c.0, (0, amount));
}
});
}
}
}
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(
&self,
ping_name: S,
) -> Option<glean::Rate> {
let ping_name = ping_name.into().map(|s| s.to_string());
match self {
RateMetric::Parent { inner, .. } => inner.test_get_value(ping_name),
RateMetric::Child(c) => {
panic!("Cannot get test value for {:?} in non-parent process!", c.0);
}
}
}
pub fn test_get_num_recorded_errors(&self, error: glean::ErrorType) -> i32 {
match self {
RateMetric::Parent { inner, .. } => inner.test_get_num_recorded_errors(error),
RateMetric::Child(c) => {
panic!(
"Cannot get the number of recorded errors for {:?} in non-parent process!",
c.0
);
}
}
}
}
#[cfg(test)]
mod test {
use crate::{common_test::*, ipc, metrics};
use glean::Rate;
#[test]
fn sets_rate_value_parent() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::irate;
metric.add_to_numerator(1);
metric.add_to_denominator(100);
assert_eq!(
Rate {
numerator: 1,
denominator: 100
},
metric.test_get_value("store1").unwrap()
);
}
#[test]
fn sets_rate_value_child() {
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::irate;
parent_metric.add_to_numerator(3);
parent_metric.add_to_denominator(9);
{
// scope for need_ipc RAII
let child_metric = parent_metric.child_metric();
let _raii = ipc::test_set_need_ipc(true);
let metric_id = child_metric.metric_id();
child_metric.add_to_numerator(42);
child_metric.add_to_denominator(24);
ipc::with_ipc_payload(move |payload| {
assert_eq!(
(42, 24),
*payload.rates.get(&metric_id).unwrap(),
"Stored the correct value in the ipc payload"
);
});
}
assert!(
false == ipc::need_ipc(),
"RAII dropped, should not need ipc any more"
);
assert!(ipc::replay_from_buf(&ipc::take_buf().unwrap()).is_ok());
assert_eq!(
Rate {
numerator: 45,
denominator: 33
},
parent_metric.test_get_value("store1").unwrap(),
"Values from the 'processes' should be summed"
);
}
}