1 files changed, 223 insertions, 0 deletions
diff --git a/third_party/rust/glean/src/private/event.rs b/third_party/rust/glean/src/private/event.rs
new file mode 100644
index 0000000000..d646ec3eb6
--- /dev/null
+++ b/third_party/rust/glean/src/private/event.rs
@@ -0,0 +1,223 @@
+// 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 std::{collections::HashMap, marker::PhantomData};
+
+use glean_core::traits;
+
+use crate::{ErrorType, RecordedEvent};
+
+pub use glean_core::traits::NoExtraKeys;
+
+// We need to wrap the glean-core type: otherwise if we try to implement
+// the trait for the metric in `glean_core::metrics` we hit error[E0117]:
+// only traits defined in the current crate can be implemented for arbitrary
+// types.
+
+/// Developer-facing API for recording event 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 struct EventMetric<K> {
+    pub(crate) inner: glean_core::metrics::EventMetric,
+    extra_keys: PhantomData<K>,
+}
+
+impl<K: traits::ExtraKeys> EventMetric<K> {
+    /// The public constructor used by automatically generated metrics.
+    pub fn new(meta: glean_core::CommonMetricData) -> Self {
+        let allowed_extra_keys = K::ALLOWED_KEYS.iter().map(|s| s.to_string()).collect();
+        let inner = glean_core::metrics::EventMetric::new(meta, allowed_extra_keys);
+        Self {
+            inner,
+            extra_keys: PhantomData,
+        }
+    }
+
+    /// The public constructor used by runtime-defined metrics.
+    pub fn with_runtime_extra_keys(
+        meta: glean_core::CommonMetricData,
+        allowed_extra_keys: Vec<String>,
+    ) -> Self {
+        let inner = glean_core::metrics::EventMetric::new(meta, allowed_extra_keys);
+        Self {
+            inner,
+            extra_keys: PhantomData,
+        }
+    }
+
+    /// Record a new event with a provided timestamp.
+    ///
+    /// It's the caller's responsibility to ensure the timestamp comes from the same clock source.
+    /// Use [`glean::get_timestamp_ms`](crate::get_timestamp_ms) to get a valid timestamp.
+    pub fn record_with_time(&self, timestamp: u64, extra: HashMap<String, String>) {
+        self.inner.record_with_time(timestamp, extra);
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::common_test::{lock_test, new_glean};
+    use crate::CommonMetricData;
+
+    #[test]
+    fn no_extra_keys() {
+        let _lock = lock_test();
+        let _t = new_glean(None, true);
+
+        let metric: EventMetric<NoExtraKeys> = EventMetric::new(CommonMetricData {
+            name: "event".into(),
+            category: "test".into(),
+            send_in_pings: vec!["test1".into()],
+            ..Default::default()
+        });
+
+        metric.record(None);
+        metric.record(None);
+
+        let data = metric.test_get_value(None).expect("no event recorded");
+        assert_eq!(2, data.len());
+        assert!(data[0].timestamp <= data[1].timestamp);
+    }
+
+    #[test]
+    fn with_extra_keys() {
+        let _lock = lock_test();
+        let _t = new_glean(None, true);
+
+        #[derive(Default, Debug, Clone, Hash, Eq, PartialEq)]
+        struct SomeExtra {
+            key1: Option<String>,
+            key2: Option<String>,
+        }
+
+        impl glean_core::traits::ExtraKeys for SomeExtra {
+            const ALLOWED_KEYS: &'static [&'static str] = &["key1", "key2"];
+
+            fn into_ffi_extra(self) -> HashMap<String, String> {
+                let mut map = HashMap::new();
+                self.key1.and_then(|key1| map.insert("key1".into(), key1));
+                self.key2.and_then(|key2| map.insert("key2".into(), key2));
+                map
+            }
+        }
+
+        let metric: EventMetric<SomeExtra> = EventMetric::new(CommonMetricData {
+            name: "event".into(),
+            category: "test".into(),
+            send_in_pings: vec!["test1".into()],
+            ..Default::default()
+        });
+
+        let map1 = SomeExtra {
+            key1: Some("1".into()),
+            ..Default::default()
+        };
+        metric.record(map1);
+
+        let map2 = SomeExtra {
+            key1: Some("1".into()),
+            key2: Some("2".into()),
+        };
+        metric.record(map2);
+
+        metric.record(None);
+
+        let data = metric.test_get_value(None).expect("no event recorded");
+        assert_eq!(3, data.len());
+        assert!(data[0].timestamp <= data[1].timestamp);
+        assert!(data[1].timestamp <= data[2].timestamp);
+
+        let mut map = HashMap::new();
+        map.insert("key1".into(), "1".into());
+        assert_eq!(Some(map), data[0].extra);
+
+        let mut map = HashMap::new();
+        map.insert("key1".into(), "1".into());
+        map.insert("key2".into(), "2".into());
+        assert_eq!(Some(map), data[1].extra);
+
+        assert_eq!(None, data[2].extra);
+    }
+
+    #[test]
+    fn with_runtime_extra_keys() {
+        let _lock = lock_test();
+        let _t = new_glean(None, true);
+
+        #[derive(Default, Debug, Clone, Hash, Eq, PartialEq)]
+        struct RuntimeExtra {}
+
+        impl glean_core::traits::ExtraKeys for RuntimeExtra {
+            const ALLOWED_KEYS: &'static [&'static str] = &[];
+
+            fn into_ffi_extra(self) -> HashMap<String, String> {
+                HashMap::new()
+            }
+        }
+
+        let metric: EventMetric<RuntimeExtra> = EventMetric::with_runtime_extra_keys(
+            CommonMetricData {
+                name: "event".into(),
+                category: "test".into(),
+                send_in_pings: vec!["test1".into()],
+                ..Default::default()
+            },
+            vec!["key1".into(), "key2".into()],
+        );
+
+        let map1 = HashMap::from([("key1".into(), "1".into())]);
+        metric.record_with_time(0, map1);
+
+        let map2 = HashMap::from([("key1".into(), "1".into()), ("key2".into(), "2".into())]);
+        metric.record_with_time(1, map2);
+
+        metric.record_with_time(2, HashMap::new());
+
+        let data = metric.test_get_value(None).expect("no event recorded");
+        assert_eq!(3, data.len());
+        assert!(data[0].timestamp <= data[1].timestamp);
+        assert!(data[1].timestamp <= data[2].timestamp);
+
+        let mut map = HashMap::new();
+        map.insert("key1".into(), "1".into());
+        assert_eq!(Some(map), data[0].extra);
+
+        let mut map = HashMap::new();
+        map.insert("key1".into(), "1".into());
+        map.insert("key2".into(), "2".into());
+        assert_eq!(Some(map), data[1].extra);
+
+        assert_eq!(None, data[2].extra);
+    }
+}
+
+#[inherent]
+impl<K: traits::ExtraKeys> traits::Event for EventMetric<K> {
+    type Extra = K;
+
+    pub fn record<M: Into<Option<<Self as traits::Event>::Extra>>>(&self, extra: M) {
+        let extra = extra
+            .into()
+            .map(|e| e.into_ffi_extra())
+            .unwrap_or_else(HashMap::new);
+        self.inner.record(extra);
+    }
+
+    pub fn test_get_value<'a, S: Into<Option<&'a str>>>(
+        &self,
+        ping_name: S,
+    ) -> Option<Vec<RecordedEvent>> {
+        let ping_name = ping_name.into().map(|s| s.to_string());
+        self.inner.test_get_value(ping_name)
+    }
+
+    pub fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32 {
+        self.inner.test_get_num_recorded_errors(error)
+    }
+}