1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/rust/glean-core/tests/storage.rs b/third_party/rust/glean-core/tests/storage.rs
new file mode 100644
index 0000000000..238fe6855c
--- /dev/null
+++ b/third_party/rust/glean-core/tests/storage.rs
@@ -0,0 +1,105 @@
+// 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/.
+
+mod common;
+use crate::common::*;
+
+use serde_json::json;
+
+use glean_core::metrics::*;
+use glean_core::storage::StorageManager;
+use glean_core::{CommonMetricData, Lifetime};
+
+#[test]
+fn snapshot_returns_none_if_nothing_is_recorded_in_the_store() {
+    let (glean, _t) = new_glean(None);
+    assert!(StorageManager
+        .snapshot(glean.storage(), "unknown_store", true)
+        .is_none())
+}
+
+#[test]
+fn can_snapshot() {
+    let (glean, _t) = new_glean(None);
+
+    let local_metric = StringMetric::new(CommonMetricData {
+        name: "can_snapshot_local_metric".into(),
+        category: "local".into(),
+        send_in_pings: vec!["store".into()],
+        ..Default::default()
+    });
+
+    local_metric.set_sync(&glean, "snapshot 42");
+
+    assert!(StorageManager
+        .snapshot(glean.storage(), "store", true)
+        .is_some())
+}
+
+#[test]
+fn snapshot_correctly_clears_the_stores() {
+    let (glean, _t) = new_glean(None);
+    let store_names: Vec<String> = vec!["store1".into(), "store2".into()];
+
+    let metric = CounterMetric::new(CommonMetricData {
+        name: "metric".into(),
+        category: "telemetry".into(),
+        send_in_pings: store_names,
+        disabled: false,
+        lifetime: Lifetime::Ping,
+        ..Default::default()
+    });
+
+    metric.add_sync(&glean, 1);
+
+    // Get the snapshot from "store1" and clear it.
+    let snapshot = StorageManager.snapshot(glean.storage(), "store1", true);
+    assert!(snapshot.is_some());
+    // Check that getting a new snapshot for "store1" returns an empty store.
+    assert!(StorageManager
+        .snapshot(glean.storage(), "store1", false)
+        .is_none());
+    // Check that we get the right data from both the stores. Clearing "store1" must
+    // not clear "store2" as well.
+    let snapshot2 = StorageManager.snapshot(glean.storage(), "store2", true);
+    assert!(snapshot2.is_some());
+}
+
+#[test]
+fn storage_is_thread_safe() {
+    use std::sync::{Arc, Barrier, Mutex};
+    use std::thread;
+
+    let (glean, _t) = new_glean(None);
+    let glean = Arc::new(Mutex::new(glean));
+
+    let threadsafe_metric = CounterMetric::new(CommonMetricData {
+        name: "threadsafe".into(),
+        category: "global".into(),
+        send_in_pings: vec!["core".into(), "metrics".into()],
+        ..Default::default()
+    });
+    let threadsafe_metric = Arc::new(threadsafe_metric);
+
+    let barrier = Arc::new(Barrier::new(2));
+    let c = barrier.clone();
+    let threadsafe_metric_clone = threadsafe_metric.clone();
+    let glean_clone = glean.clone();
+    let child = thread::spawn(move || {
+        threadsafe_metric_clone.add_sync(&glean_clone.lock().unwrap(), 1);
+        c.wait();
+        threadsafe_metric_clone.add_sync(&glean_clone.lock().unwrap(), 1);
+    });
+
+    threadsafe_metric.add_sync(&glean.lock().unwrap(), 1);
+    barrier.wait();
+    threadsafe_metric.add_sync(&glean.lock().unwrap(), 1);
+
+    child.join().unwrap();
+
+    let snapshot = StorageManager
+        .snapshot_as_json(glean.lock().unwrap().storage(), "core", true)
+        .unwrap();
+    assert_eq!(json!({"counter": { "global.threadsafe": 4 }}), snapshot);
+}