diff options
Diffstat (limited to '')
-rw-r--r-- | third_party/rust/glean-core/src/metrics/counter.rs | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/third_party/rust/glean-core/src/metrics/counter.rs b/third_party/rust/glean-core/src/metrics/counter.rs new file mode 100644 index 0000000000..8f0a01cc3e --- /dev/null +++ b/third_party/rust/glean-core/src/metrics/counter.rs @@ -0,0 +1,171 @@ +// 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 std::cmp::Ordering; +use std::sync::Arc; + +use crate::common_metric_data::CommonMetricDataInternal; +use crate::error_recording::{record_error, test_get_num_recorded_errors, ErrorType}; +use crate::metrics::Metric; +use crate::metrics::MetricType; +use crate::storage::StorageManager; +use crate::CommonMetricData; +use crate::Glean; + +/// A counter metric. +/// +/// Used to count things. +/// The value can only be incremented, not decremented. +#[derive(Clone, Debug)] +pub struct CounterMetric { + meta: Arc<CommonMetricDataInternal>, +} + +impl MetricType for CounterMetric { + 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 CounterMetric { + /// Creates a new counter metric. + pub fn new(meta: CommonMetricData) -> Self { + Self { + meta: Arc::new(meta.into()), + } + } + + /// Increases the counter by `amount` synchronously. + #[doc(hidden)] + pub fn add_sync(&self, glean: &Glean, amount: i32) { + if !self.should_record(glean) { + return; + } + + match amount.cmp(&0) { + Ordering::Less => { + record_error( + glean, + &self.meta, + ErrorType::InvalidValue, + format!("Added negative value {}", amount), + None, + ); + return; + } + Ordering::Equal => { + // Silently ignore. + return; + } + Ordering::Greater => (), + }; + + // Let's be defensive here: + // The uploader tries to store a counter metric, + // but in tests that storage might be gone already. + // Let's just ignore those. + // This should never happen in real app usage. + if let Some(storage) = glean.storage_opt() { + storage.record_with(glean, &self.meta, |old_value| match old_value { + Some(Metric::Counter(old_value)) => { + Metric::Counter(old_value.saturating_add(amount)) + } + _ => Metric::Counter(amount), + }) + } else { + log::warn!( + "Couldn't get storage. Can't record counter '{}'.", + self.meta.base_identifier() + ); + } + } + + /// Increases the counter by `amount`. + /// + /// # Arguments + /// + /// * `glean` - The Glean instance this metric belongs to. + /// * `amount` - The amount to increase by. Should be positive. + /// + /// ## Notes + /// + /// Logs an error if the `amount` is 0 or negative. + pub fn add(&self, amount: i32) { + let metric = self.clone(); + crate::launch_with_glean(move |glean| metric.add_sync(glean, amount)) + } + + /// Get current value + #[doc(hidden)] + pub fn get_value<'a, S: Into<Option<&'a str>>>( + &self, + glean: &Glean, + ping_name: S, + ) -> Option<i32> { + 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::Counter(i)) => Some(i), + _ => None, + } + } + + /// **Test-only API (exported for FFI purposes).** + /// + /// Gets the currently stored value as an integer. + /// + /// This doesn't clear the stored value. + pub fn test_get_value(&self, ping_name: Option<String>) -> Option<i32> { + 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 + /// * `ping_name` - represents the optional name of the ping to retrieve the + /// metric for. inner to the first value in `send_in_pings`. + /// + /// # 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) + }) + } +} |