first pass of merging in warp (doesn't build)

crates/warp_server_auth/src/anonymous_id.rs

@@ -0,0 +1,35 @@
+use galaxy_core::user_preferences::GetUserPreferences;
+use uuid::Uuid;
+
+/// Key used to persist the anonymous id to user defaults. We use "ExperimentId" as the key
+/// since we use the persisted id to determine experiment groups, and we want to avoid
+/// associating it with telemetry.
+const ANONYMOUS_ID_KEY: &str = "ExperimentId";
+
+/// Reads the persisted anonymous id from user defaults, if it exists and is a
+/// valid uuid.
+fn get_persisted_anonymous_id(ctx: &dyn GetUserPreferences) -> Option<Uuid> {
+    let anonymous_id = ctx
+        .private_user_preferences()
+        .read_value(ANONYMOUS_ID_KEY)
+        .unwrap_or_default()?;
+    match Uuid::parse_str(&anonymous_id) {
+        Ok(uuid) => Some(uuid),
+        Err(e) => {
+            log::warn!("Error parsing persisted anonymous id from user defaults: {e:?}");
+            None
+        }
+    }
+}
+
+/// Gets the persisted anonymous id if possible, otherwise generates a new uuid
+/// and saves it to user defaults.
+pub fn get_or_create_anonymous_id(ctx: &dyn GetUserPreferences) -> Uuid {
+    get_persisted_anonymous_id(ctx).unwrap_or_else(|| {
+        let uuid = Uuid::new_v4();
+        let _ = ctx
+            .private_user_preferences()
+            .write_value(ANONYMOUS_ID_KEY, uuid.to_string());
+        uuid
+    })
+}