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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 std::collections::HashMap;
use inherent::inherent;
use super::{CommonMetricData, MetricId, RecordedEvent};
use crate::ipc::{need_ipc, with_ipc_payload};
use glean::traits::Event;
pub use glean::traits::{EventRecordingError, ExtraKeys, NoExtraKeys};
/// An event metric.
///
/// Events allow recording of e.g. individual occurences of user actions, say
/// every time a view was open and from where. Each time you record an event, it
/// records a timestamp, the event's name and a set of custom values.
pub enum EventMetric<K> {
Parent {
/// The metric's ID.
///
/// **TEST-ONLY** - Do not use unless gated with `#[cfg(test)]`.
id: MetricId,
inner: glean::private::EventMetric<K>,
},
Child(EventMetricIpc),
}
#[derive(Debug)]
pub struct EventMetricIpc(MetricId);
impl<K: 'static + ExtraKeys + Send + Sync> EventMetric<K> {
/// Create a new event metric.
pub fn new(id: MetricId, meta: CommonMetricData) -> Self {
if need_ipc() {
EventMetric::Child(EventMetricIpc(id))
} else {
let inner = glean::private::EventMetric::new(meta);
EventMetric::Parent { id, inner }
}
}
pub fn with_runtime_extra_keys(
id: MetricId,
meta: CommonMetricData,
allowed_extra_keys: Vec<String>,
) -> Self {
if need_ipc() {
EventMetric::Child(EventMetricIpc(id))
} else {
let inner =
glean::private::EventMetric::with_runtime_extra_keys(meta, allowed_extra_keys);
EventMetric::Parent { id, inner }
}
}
#[cfg(test)]
pub(crate) fn child_metric(&self) -> Self {
match self {
EventMetric::Parent { id, .. } => EventMetric::Child(EventMetricIpc(*id)),
EventMetric::Child(_) => panic!("Can't get a child metric from a child metric"),
}
}
/// Record a new event with the raw `extra key ID -> String` map.
///
/// Should only be used when taking in data over FFI, where extra keys only exists as IDs.
pub(crate) fn record_raw(&self, extra: HashMap<String, String>) {
let now = glean::get_timestamp_ms();
self.record_with_time(now, extra);
}
/// Record a new event with the given timestamp and the raw `extra key ID -> String` map.
///
/// Should only be used when applying previously recorded events, e.g. from IPC.
pub(crate) fn record_with_time(&self, timestamp: u64, extra: HashMap<String, String>) {
match self {
EventMetric::Parent { inner, .. } => {
inner.record_with_time(timestamp, extra);
}
EventMetric::Child(c) => {
with_ipc_payload(move |payload| {
if let Some(v) = payload.events.get_mut(&c.0) {
v.push((timestamp, extra));
} else {
let v = vec![(timestamp, extra)];
payload.events.insert(c.0, v);
}
});
}
}
}
}
#[inherent]
impl<K: 'static + ExtraKeys + Send + Sync> Event for EventMetric<K> {
type Extra = K;
pub fn record<M: Into<Option<K>>>(&self, extra: M) {
match self {
EventMetric::Parent { inner, .. } => {
inner.record(extra);
}
EventMetric::Child(_) => {
let now = glean::get_timestamp_ms();
let extra = extra.into().map(|extra| extra.into_ffi_extra());
let extra = extra.unwrap_or_else(HashMap::new);
self.record_with_time(now, extra);
}
}
}
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(
&self,
ping_name: S,
) -> Option<Vec<RecordedEvent>> {
match self {
EventMetric::Parent { inner, .. } => inner.test_get_value(ping_name),
EventMetric::Child(_) => {
panic!("Cannot get test value for event metric in non-main process!",)
}
}
}
pub fn test_get_num_recorded_errors(&self, error: glean::ErrorType) -> i32 {
match self {
EventMetric::Parent { inner, .. } => inner.test_get_num_recorded_errors(error),
EventMetric::Child(c) => panic!(
"Cannot get the number of recorded errors for {:?} in non-main process!",
c.0
),
}
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::{common_test::*, ipc, metrics};
#[test]
fn smoke_test_event() {
let _lock = lock_test();
let metric = EventMetric::<NoExtraKeys>::new(
0.into(),
CommonMetricData {
name: "event_metric".into(),
category: "telemetry".into(),
send_in_pings: vec!["store1".into()],
disabled: false,
..Default::default()
},
);
// No extra keys
metric.record(None);
let recorded = metric.test_get_value("store1").unwrap();
assert!(recorded.iter().any(|e| e.name == "event_metric"));
}
#[test]
fn event_ipc() {
use metrics::test_only_ipc::AnEventExtra;
let _lock = lock_test();
let parent_metric = &metrics::test_only_ipc::an_event;
// No extra keys
parent_metric.record(None);
{
let child_metric = parent_metric.child_metric();
// scope for need_ipc RAII.
let _raii = ipc::test_set_need_ipc(true);
child_metric.record(None);
let extra = AnEventExtra {
extra1: Some("a-child-value".into()),
..Default::default()
};
child_metric.record(extra);
}
// Record in the parent after the child.
let extra = AnEventExtra {
extra1: Some("a-valid-value".into()),
..Default::default()
};
parent_metric.record(extra);
assert!(ipc::replay_from_buf(&ipc::take_buf().unwrap()).is_ok());
let events = parent_metric.test_get_value("store1").unwrap();
assert_eq!(events.len(), 4);
// Events from the child process are last, they might get sorted later by Glean.
assert_eq!(events[0].extra, None);
assert!(events[1].extra.as_ref().unwrap().get("extra1").unwrap() == "a-valid-value");
assert_eq!(events[2].extra, None);
assert!(events[3].extra.as_ref().unwrap().get("extra1").unwrap() == "a-child-value");
}
#[test]
fn events_with_typed_extras() {
use metrics::test_only_ipc::EventWithExtraExtra;
let _lock = lock_test();
let event = &metrics::test_only_ipc::event_with_extra;
// Record in the parent after the child.
let extra = EventWithExtraExtra {
extra1: Some("a-valid-value".into()),
extra2: Some(37),
extra3_longer_name: Some(false),
};
event.record(extra);
let recorded = event.test_get_value("store1").unwrap();
assert_eq!(recorded.len(), 1);
assert!(recorded[0].extra.as_ref().unwrap().get("extra1").unwrap() == "a-valid-value");
assert!(recorded[0].extra.as_ref().unwrap().get("extra2").unwrap() == "37");
assert!(
recorded[0]
.extra
.as_ref()
.unwrap()
.get("extra3_longer_name")
.unwrap()
== "false"
);
}
}