1 files changed, 35 insertions, 0 deletions
diff --git a/toolkit/components/glean/api/src/ffi/numerator.rs b/toolkit/components/glean/api/src/ffi/numerator.rs
new file mode 100644
index 0000000000..e679e426c4
--- /dev/null
+++ b/toolkit/components/glean/api/src/ffi/numerator.rs
@@ -0,0 +1,35 @@
+// 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/.
+
+#![cfg(feature = "with_gecko")]
+
+use nsstring::nsACString;
+
+#[no_mangle]
+pub unsafe extern "C" fn fog_numerator_add_to_numerator(id: u32, amount: i32) {
+    with_metric!(NUMERATOR_MAP, id, metric, metric.add_to_numerator(amount));
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn fog_numerator_test_has_value(id: u32, ping_name: &nsACString) -> bool {
+    with_metric!(NUMERATOR_MAP, id, metric, test_has!(metric, ping_name))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn fog_numerator_test_get_value(
+    id: u32,
+    ping_name: &nsACString,
+    num: &mut i32,
+    den: &mut i32,
+) {
+    let rate = with_metric!(NUMERATOR_MAP, id, metric, test_get!(metric, ping_name));
+    *num = rate.numerator;
+    *den = rate.denominator;
+}
+
+#[no_mangle]
+pub extern "C" fn fog_numerator_test_get_error(id: u32, error_str: &mut nsACString) -> bool {
+    let err = with_metric!(NUMERATOR_MAP, id, metric, test_get_errors!(metric));
+    err.map(|err_str| error_str.assign(&err_str)).is_some()
+}