Use enum for event in scuba! macro

Summary: Require the `event` column to be a variant of `supertd_events::Event`. This should help ensure that when a new event is added, we don't accidentally use a name which is already in use.

Reviewed By: aniketmathur

Differential Revision: D53839048

fbshipit-source-id: cbd119d91ef60978ae9e713c32e8e23ffdfcae7f

btd/src/lib.rs

@@ -264,7 +264,7 @@ pub fn main(args: Args) -> anyhow::Result<()> {
         "finish with {immediate_changes} immediate changes, {total_changes} total changes"
     ));
     td_util::scuba!(
-        event: "BTD_SUCCESS",
+        event: BTD_SUCCESS,
         duration_ms: t.elapsed().as_millis() as u64,
         data: json!({
             "immediate_changes": immediate_changes,

targets/src/lib.rs

@@ -101,7 +101,7 @@ pub fn run(
     let status = command.status()?;
     if status.success() {
         td_util::scuba!(
-            event: "TARGETS_SUCCESS",
+            event: TARGETS_SUCCESS,
             duration_ms: t.elapsed().as_millis() as u64,
         );
         Ok(())

td_util/src/supertd_events.rs

@@ -18,6 +18,21 @@ const SCUBA_DATASET: &str = "supertd_events";
 
 static BUILDER: OnceLock<ScubaSampleBuilder> = OnceLock::new();
 
+/// All events logged to the `supertd_events` dataset.
+///
+/// Each event should generally be logged from a single source location.
+#[derive(Debug)]
+#[allow(non_camel_case_types)]
+pub enum Event {
+    BTD_SUCCESS,
+    INVALID_TRIGGER,
+    RANKER_SUCCESS,
+    SCHEDULER_SUCCESS,
+    TARGETS_SUCCESS,
+    VERIFIABLE_MATCHER_SUCCESS,
+    VERSE_SUCCESS,
+}
+
 /// Initialize the Scuba client for the `supertd_events` dataset.
 ///
 /// Returns a guard that flushes the Scuba client when dropped.
@@ -68,7 +83,7 @@ pub fn init(fb: fbinit::FacebookInit) -> ScubaClientGuard {
 /// # let foos_run = 10;
 /// # let bars_launched = 2;
 /// td_util::scuba!(
-///     event: "COMMAND_SUCCESS",
+///     event: BTD_SUCCESS,
 ///     count: foos_run + bars_launched,
 ///     data: json!({
 ///         "arbitrary": ["JSON", "object"],
@@ -79,11 +94,18 @@ pub fn init(fb: fbinit::FacebookInit) -> ScubaClientGuard {
 /// ```
 #[macro_export]
 macro_rules! scuba {
-    ( $($key:ident : $value:expr),* $(,)? ) => {
+    ( event: $event:ident, $($key:ident : $value:expr),* $(,)? ) => {
         let mut builder = $crate::supertd_events::sample_builder();
+        builder.add("event", format!("{:?}", &$crate::supertd_events::Event::$event));
         $($crate::scuba! { @SET_FIELD(builder, $key, $value) })*
         builder.log();
     };
+    ( event: $event:ident ) => {
+        $crate::scuba! { event: $event, }
+    };
+    ( $($key:ident : $value:expr),* $(,)? ) => {
+        compile_error!("`event` must be the first field in the `scuba!` macro");
+    };
     ( @SET_FIELD ( $builder:ident, data, $value:expr ) ) => {{
         use $crate::supertd_events::serde_json::json;
         // This unwrap should only fail for map keys with invalid UTF-8.