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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 uuid::Uuid;
use super::{CommonMetricData, MetricId};
use crate::ipc::need_ipc;
/// A UUID metric.
///
/// Stores UUID values.
pub enum UuidMetric {
Parent(glean::private::UuidMetric),
Child(UuidMetricIpc),
}
#[derive(Debug)]
pub struct UuidMetricIpc;
impl UuidMetric {
/// Create a new UUID metric.
pub fn new(_id: MetricId, meta: CommonMetricData) -> Self {
if need_ipc() {
UuidMetric::Child(UuidMetricIpc)
} else {
UuidMetric::Parent(glean::private::UuidMetric::new(meta))
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
UuidMetric::Parent(_) => UuidMetric::Child(UuidMetricIpc),
UuidMetric::Child(_) => panic!("Can't get a child metric from a child metric"),
}
}
}
#[inherent]
impl glean::traits::Uuid for UuidMetric {
/// Set to the specified value.
///
/// ## Arguments
///
/// * `value` - The UUID to set the metric to.
pub fn set(&self, value: Uuid) {
match self {
UuidMetric::Parent(p) => p.set(value.to_string()),
UuidMetric::Child(_c) => {
log::error!("Unable to set the uuid metric in non-main process. This operation will be ignored.");
// If we're in automation we can panic so the instrumentor knows they've gone wrong.
// This is a deliberate violation of Glean's "metric APIs must not throw" design.
assert!(!crate::ipc::is_in_automation(), "Attempted to set uuid metric in non-main process, which is forbidden. This panics in automation.");
// TODO: Record an error.
}
};
}
/// Generate a new random UUID and set the metric to it.
///
/// ## Return value
///
/// Returns the stored UUID value or `Uuid::nil` if called from
/// a non-main process.
pub fn generate_and_set(&self) -> Uuid {
match self {
UuidMetric::Parent(p) => Uuid::parse_str(&p.generate_and_set()).unwrap(),
UuidMetric::Child(_c) => {
log::error!("Unable to set the uuid metric in non-main process. This operation will be ignored.");
// If we're in automation we can panic so the instrumentor knows they've gone wrong.
// This is a deliberate violation of Glean's "metric APIs must not throw" design.
assert!(!crate::ipc::is_in_automation(), "Attempted to set uuid metric in non-main process, which is forbidden. This panics in automation.");
// TODO: Record an error.
Uuid::nil()
}
}
}
/// **Test-only API.**
///
/// Get the stored UUID value.
/// This doesn't clear the stored value.
///
/// ## Arguments
///
/// * `storage_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, storage_name: S) -> Option<Uuid> {
let storage_name = storage_name.into().map(|s| s.to_string());
match self {
UuidMetric::Parent(p) => p
.test_get_value(storage_name)
.and_then(|s| Uuid::parse_str(&s).ok()),
UuidMetric::Child(_c) => panic!("Cannot get test value for in non-main process!"),
}
}
/// **Exported for test purposes.**
///
/// 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 {
UuidMetric::Parent(p) => p.test_get_num_recorded_errors(error),
UuidMetric::Child(_c) => {
panic!("Cannot get test value for UuidMetric in non-main process!")
}
}
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::{common_test::*, ipc, metrics};
#[test]
fn sets_uuid_value() {
let _lock = lock_test();
let metric = &metrics::test_only_ipc::a_uuid;
let expected = Uuid::new_v4();
metric.set(expected.clone());
assert_eq!(expected, metric.test_get_value("store1").unwrap());
}
#[test]
fn uuid_ipc() {
// UuidMetric doesn't support IPC.
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::a_uuid;
let expected = Uuid::new_v4();
parent_metric.set(expected.clone());
{
let child_metric = parent_metric.child_metric();
// Instrumentation calls do not panic.
child_metric.set(Uuid::new_v4());
// (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_eq!(
expected,
parent_metric.test_get_value("store1").unwrap(),
"UUID metrics should only work in the parent process"
);
}
}