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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
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
use inherent::inherent;
use glean_core::traits::Boolean;
use super::CommonMetricData;
use crate::ipc::need_ipc;
use crate::private::MetricId;
/// A boolean metric.
///
/// Records a simple true or false value.
#[derive(Clone)]
pub enum BooleanMetric {
Parent(glean::private::BooleanMetric),
Child(BooleanMetricIpc),
}
#[derive(Clone, Debug)]
pub struct BooleanMetricIpc;
impl BooleanMetric {
/// Create a new boolean metric.
pub fn new(_id: MetricId, meta: CommonMetricData) -> Self {
if need_ipc() {
BooleanMetric::Child(BooleanMetricIpc)
} else {
BooleanMetric::Parent(glean::private::BooleanMetric::new(meta))
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
BooleanMetric::Parent(_) => BooleanMetric::Child(BooleanMetricIpc),
BooleanMetric::Child(_) => panic!("Can't get a child metric from a child metric"),
}
}
}
#[inherent(pub)]
impl Boolean for BooleanMetric {
/// Set to the specified boolean value.
///
/// ## Arguments
///
/// * `value` - the value to set.
fn set(&self, value: bool) {
match self {
BooleanMetric::Parent(p) => {
Boolean::set(&*p, value);
}
BooleanMetric::Child(_) => {
log::error!("Unable to set boolean metric in non-parent process. Ignoring.");
// TODO: Record an error.
}
}
}
/// **Test-only API.**
///
/// Get the currently stored value as a boolean.
/// 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.
fn test_get_value<'a, S: Into<Option<&'a str>>>(&self, ping_name: S) -> Option<bool> {
match self {
BooleanMetric::Parent(p) => p.test_get_value(ping_name),
BooleanMetric::Child(_) => {
panic!("Cannot get test value for boolean metric in non-parent process!",)
}
}
}
}
#[cfg(test)]
mod test {
use crate::{common_test::*, ipc, metrics};
#[test]
fn sets_boolean_value() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::a_bool;
metric.set(true);
assert!(metric.test_get_value("store1").unwrap());
}
#[test]
fn boolean_ipc() {
// BooleanMetric doesn't support IPC.
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::a_bool;
parent_metric.set(false);
{
let child_metric = parent_metric.child_metric();
// scope for need_ipc RAII
let _raii = ipc::test_set_need_ipc(true);
// Instrumentation calls do not panic.
child_metric.set(true);
// (They also shouldn't do anything,
// but that's not something we can inspect in this test)
}
assert!(ipc::replay_from_buf(&ipc::take_buf().unwrap()).is_ok());
assert!(
false == parent_metric.test_get_value("store1").unwrap(),
"Boolean metrics should only work in the parent process"
);
}
}
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