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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 glean::traits::Counter;
use super::CommonMetricData;
use crate::ipc::{need_ipc, with_ipc_payload};
use crate::private::{CounterMetric, MetricId};
use std::collections::HashMap;
/// A counter metric that knows it's a labeled counter's submetric.
///
/// It has special work to do when in a non-parent process.
/// When on the parent process, it dispatches calls to the normal CounterMetric.
#[derive(Clone)]
pub enum LabeledCounterMetric {
Parent(CounterMetric),
Child { id: MetricId, label: String },
}
impl LabeledCounterMetric {
/// Create a new labeled counter submetric.
pub fn new(id: MetricId, meta: CommonMetricData, label: String) -> Self {
if need_ipc() {
LabeledCounterMetric::Child { id, label }
} else {
LabeledCounterMetric::Parent(CounterMetric::new(id, meta))
}
}
#[cfg(test)]
pub(crate) fn metric_id(&self) -> MetricId {
match self {
LabeledCounterMetric::Parent(p) => p.metric_id(),
LabeledCounterMetric::Child { id, .. } => *id,
}
}
}
#[inherent]
impl Counter for LabeledCounterMetric {
/// Increase the counter by `amount`.
///
/// ## Arguments
///
/// * `amount` - The amount to increase by. Should be positive.
///
/// ## Notes
///
/// Logs an error if the `amount` is 0 or negative.
pub fn add(&self, amount: i32) {
match self {
LabeledCounterMetric::Parent(p) => p.add(amount),
LabeledCounterMetric::Child { id, label } => {
with_ipc_payload(move |payload| {
if let Some(map) = payload.labeled_counters.get_mut(id) {
if let Some(v) = map.get_mut(label) {
*v += amount;
} else {
map.insert(label.to_string(), amount);
}
} else {
let mut map = HashMap::new();
map.insert(label.to_string(), amount);
payload.labeled_counters.insert(*id, map);
}
});
}
}
}
/// **Test-only API.**
///
/// Get the currently stored value as an integer.
/// This doesn't clear the stored value.
///
/// ## Arguments
///
/// * `ping_name` - the storage name to look into.
///
/// ## Return value
///
/// Returns the stored value or `None` if nothing stored.
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(&self, ping_name: S) -> Option<i32> {
match self {
LabeledCounterMetric::Parent(p) => p.test_get_value(ping_name),
LabeledCounterMetric::Child { id, .. } => {
panic!("Cannot get test value for {:?} in non-parent process!", id)
}
}
}
/// **Test-only API.**
///
/// Gets the number of recorded errors for the given metric and error type.
///
/// # Arguments
///
/// * `error` - The type of error
/// * `ping_name` - represents the optional name of the ping to retrieve the
/// metric for. Defaults to the first value in `send_in_pings`.
///
/// # Returns
///
/// The number of errors reported.
pub fn test_get_num_recorded_errors(&self, error: glean::ErrorType) -> i32 {
match self {
LabeledCounterMetric::Parent(p) => p.test_get_num_recorded_errors(error),
LabeledCounterMetric::Child { id, .. } => panic!(
"Cannot get the number of recorded errors for {:?} in non-parent process!",
id
),
}
}
}
#[cfg(test)]
mod test {
use crate::{common_test::*, ipc, metrics};
#[test]
fn sets_labeled_counter_value_parent() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::a_labeled_counter;
metric.get("a_label").add(1);
assert_eq!(1, metric.get("a_label").test_get_value("store1").unwrap());
}
#[test]
fn sets_labeled_counter_value_child() {
let _lock = lock_test();
let label = "some_label";
let parent_metric = &metrics::test_only_ipc::a_labeled_counter;
parent_metric.get(label).add(3);
{
// scope for need_ipc RAII
let _raii = ipc::test_set_need_ipc(true);
let child_metric = parent_metric.get(label);
let metric_id = child_metric.metric_id();
child_metric.add(42);
ipc::with_ipc_payload(move |payload| {
assert_eq!(
42,
*payload
.labeled_counters
.get(&metric_id)
.unwrap()
.get(label)
.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!(
45,
parent_metric.get(label).test_get_value("store1").unwrap(),
"Values from the 'processes' should be summed"
);
}
}