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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::marker::PhantomData;
use glean_core::metrics::JsonValue;
use glean_core::traits;
use crate::ErrorType;
// 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 object 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 ObjectMetric<K> {
pub(crate) inner: glean_core::metrics::ObjectMetric,
object_type: PhantomData<K>,
}
impl<K: traits::ObjectSerialize> ObjectMetric<K> {
/// The public constructor used by automatically generated metrics.
pub fn new(meta: glean_core::CommonMetricData) -> Self {
let inner = glean_core::metrics::ObjectMetric::new(meta);
Self {
inner,
object_type: PhantomData,
}
}
/// Sets to the specified structure.
///
/// # Arguments
///
/// * `object` - the object to set.
pub fn set(&self, object: K) {
let obj = object
.into_serialized_object()
.expect("failed to serialize object. This should be impossible.");
self.inner.set(obj);
}
/// Sets to the specified structure.
///
/// Parses the passed JSON string.
/// If it can't be parsed into a valid object it records an invalid value error.
///
/// # Arguments
///
/// * `object` - JSON representation of the object to set.
pub fn set_string(&self, object: String) {
let data = match K::from_str(&object) {
Ok(data) => data,
Err(_) => {
self.inner.record_schema_error();
return;
}
};
self.set(data)
}
/// **Test-only API (exported for FFI purposes).**
///
/// Gets the currently stored value as JSON-encoded string.
///
/// This doesn't clear the stored value.
pub fn test_get_value<'a, S: Into<Option<&'a str>>>(&self, ping_name: S) -> Option<JsonValue> {
let ping_name = ping_name.into().map(|s| s.to_string());
self.inner.test_get_value(ping_name)
}
/// **Exported for test purposes.**
///
/// Gets the number of recorded errors for the given metric and error type.
///
/// # Arguments
///
/// * `error` - The type of error
///
/// # Returns
///
/// The number of errors reported.
pub fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32 {
self.inner.test_get_num_recorded_errors(error)
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::common_test::{lock_test, new_glean};
use crate::CommonMetricData;
use serde_json::json;
#[test]
fn simple_array() {
let _lock = lock_test();
let _t = new_glean(None, true);
type SimpleArray = Vec<i64>;
let metric: ObjectMetric<SimpleArray> = ObjectMetric::new(CommonMetricData {
name: "object".into(),
category: "test".into(),
send_in_pings: vec!["test1".into()],
..Default::default()
});
let arr = SimpleArray::from([1, 2, 3]);
metric.set(arr);
let data = metric.test_get_value(None).expect("no object recorded");
let expected = json!([1, 2, 3]);
assert_eq!(expected, data);
}
#[test]
fn complex_nested_object() {
let _lock = lock_test();
let _t = new_glean(None, true);
type BalloonsObject = Vec<BalloonsObjectItem>;
#[derive(
Debug, Hash, Eq, PartialEq, traits::__serde::Deserialize, traits::__serde::Serialize,
)]
#[serde(crate = "traits::__serde")]
#[serde(deny_unknown_fields)]
struct BalloonsObjectItem {
#[serde(skip_serializing_if = "Option::is_none")]
colour: Option<String>,
#[serde(skip_serializing_if = "Option::is_none")]
diameter: Option<i64>,
}
let metric: ObjectMetric<BalloonsObject> = ObjectMetric::new(CommonMetricData {
name: "object".into(),
category: "test".into(),
send_in_pings: vec!["test1".into()],
..Default::default()
});
let balloons = BalloonsObject::from([
BalloonsObjectItem {
colour: Some("red".to_string()),
diameter: Some(5),
},
BalloonsObjectItem {
colour: Some("green".to_string()),
diameter: None,
},
]);
metric.set(balloons);
let data = metric.test_get_value(None).expect("no object recorded");
let expected = json!([
{ "colour": "red", "diameter": 5 },
{ "colour": "green" },
]);
assert_eq!(expected, data);
}
#[test]
fn set_string_api() {
let _lock = lock_test();
let _t = new_glean(None, true);
type SimpleArray = Vec<i64>;
let metric: ObjectMetric<SimpleArray> = ObjectMetric::new(CommonMetricData {
name: "object".into(),
category: "test".into(),
send_in_pings: vec!["test1".into()],
..Default::default()
});
let arr_str = String::from("[1, 2, 3]");
metric.set_string(arr_str);
let data = metric.test_get_value(None).expect("no object recorded");
let expected = json!([1, 2, 3]);
assert_eq!(expected, data);
}
}