Bug 1632149 - Implement boolean metric for FOG. r=chutten

Differential Revision: https://phabricator.services.mozilla.com/D72653

toolkit/components/glean/api/src/metrics/boolean.rs

@@ -0,0 +1,43 @@
+// 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 glean_core::CommonMetricData;
+
+/// A boolean metric.
+///
+/// Records a simple true or false value.
+#[derive(Clone, Debug)]
+pub struct BooleanMetric(glean_core::metrics::BooleanMetric);
+
+impl BooleanMetric {
+    /// Create a new boolean metric.
+    pub fn new(meta: CommonMetricData) -> Self {
+        Self(glean_core::metrics::BooleanMetric::new(meta))
+    }
+
+    /// Set to the specified boolean value.
+    ///
+    /// ## Arguments
+    ///
+    /// * `value` - the value to set.
+    pub fn set(&self, value: bool) {
+        crate::with_glean(move |glean| self.0.set(glean, value))
+    }
+
+    /// **Test-only API.**
+    ///
+    /// Get the currently stored value as a boolean.
+    /// This doesn't clear the stored value.
+    ///
+    /// ## Arguments
+    ///
+    /// * `storage_name` - the storage name to look into.
+    ///
+    /// ## Return value
+    ///
+    /// Returns the stored value or `None` if nothing stored.
+    pub fn test_get_value(&self, storage_name: &str) -> Option<bool> {
+        crate::with_glean(move |glean| self.0.test_get_value(glean, storage_name))
+    }
+}

toolkit/components/glean/api/src/metrics/mod.rs

@@ -9,8 +9,10 @@
 // version mismatch).
 pub use glean_core::{CommonMetricData, Lifetime};
 
+mod boolean;
 mod counter;
 mod string;
 
+pub use self::boolean::BooleanMetric;
 pub use self::counter::CounterMetric;
 pub use self::string::StringMetric;