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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::sync::Arc;
use crate::common_metric_data::CommonMetricDataInternal;
use crate::error_recording::{test_get_num_recorded_errors, ErrorType};
use crate::metrics::Metric;
use crate::metrics::MetricType;
use crate::storage::StorageManager;
use crate::util::truncate_string_at_boundary_with_error;
use crate::CommonMetricData;
use crate::Glean;
const MAX_LENGTH_VALUE: usize = 255;
/// A string metric.
///
/// Record an Unicode string value with arbitrary content.
/// Strings are length-limited to `MAX_LENGTH_VALUE` bytes.
#[derive(Clone, Debug)]
pub struct StringMetric {
meta: Arc<CommonMetricDataInternal>,
}
impl MetricType for StringMetric {
fn meta(&self) -> &CommonMetricDataInternal {
&self.meta
}
fn with_name(&self, name: String) -> Self {
let mut meta = (*self.meta).clone();
meta.inner.name = name;
Self {
meta: Arc::new(meta),
}
}
fn with_dynamic_label(&self, label: String) -> Self {
let mut meta = (*self.meta).clone();
meta.inner.dynamic_label = Some(label);
Self {
meta: Arc::new(meta),
}
}
}
// IMPORTANT:
//
// When changing this implementation, make sure all the operations are
// also declared in the related trait in `../traits/`.
impl StringMetric {
/// Creates a new string metric.
pub fn new(meta: CommonMetricData) -> Self {
Self {
meta: Arc::new(meta.into()),
}
}
/// Sets to the specified value.
///
/// # Arguments
///
/// * `value` - The string to set the metric to.
///
/// ## Notes
///
/// Truncates the value if it is longer than `MAX_LENGTH_VALUE` bytes and logs an error.
pub fn set(&self, value: String) {
let metric = self.clone();
crate::launch_with_glean(move |glean| metric.set_sync(glean, &value))
}
/// Sets to the specified value synchronously.
#[doc(hidden)]
pub fn set_sync<S: Into<String>>(&self, glean: &Glean, value: S) {
if !self.should_record(glean) {
return;
}
let s = truncate_string_at_boundary_with_error(glean, &self.meta, value, MAX_LENGTH_VALUE);
let value = Metric::String(s);
glean.storage().record(glean, &self.meta, &value)
}
/// Gets the current-stored value as a string, or None if there is no value.
#[doc(hidden)]
pub fn get_value<'a, S: Into<Option<&'a str>>>(
&self,
glean: &Glean,
ping_name: S,
) -> Option<String> {
let queried_ping_name = ping_name
.into()
.unwrap_or_else(|| &self.meta().inner.send_in_pings[0]);
match StorageManager.snapshot_metric_for_test(
glean.storage(),
queried_ping_name,
&self.meta.identifier(glean),
self.meta.inner.lifetime,
) {
Some(Metric::String(s)) => Some(s),
_ => None,
}
}
/// **Test-only API (exported for FFI purposes).**
///
/// Gets the currently stored value as a string.
///
/// This doesn't clear the stored value.
///
/// # Arguments
///
/// * `ping_name` - the optional name of the ping to retrieve the metric
/// for. Defaults to the first value in `send_in_pings`.
///
/// # Returns
///
/// The stored value or `None` if nothing stored.
pub fn test_get_value(&self, ping_name: Option<String>) -> Option<String> {
crate::block_on_dispatcher();
crate::core::with_glean(|glean| self.get_value(glean, ping_name.as_deref()))
}
/// **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 {
crate::block_on_dispatcher();
crate::core::with_glean(|glean| {
test_get_num_recorded_errors(glean, self.meta(), error).unwrap_or(0)
})
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::tests::new_glean;
use crate::util::truncate_string_at_boundary;
use crate::Lifetime;
#[test]
fn setting_a_long_string_records_an_error() {
let (glean, _t) = new_glean(None);
let metric = StringMetric::new(CommonMetricData {
name: "string_metric".into(),
category: "test".into(),
send_in_pings: vec!["store1".into()],
lifetime: Lifetime::Application,
disabled: false,
dynamic_label: None,
});
let sample_string = "0123456789".repeat(26);
metric.set_sync(&glean, sample_string.clone());
let truncated = truncate_string_at_boundary(sample_string, MAX_LENGTH_VALUE);
assert_eq!(truncated, metric.get_value(&glean, "store1").unwrap());
assert_eq!(
1,
test_get_num_recorded_errors(&glean, metric.meta(), ErrorType::InvalidOverflow)
.unwrap()
);
}
}