fix(cat-gateway): include follower reaching tip condition in ready endpoint (#2676)

Author: saibatizoku

catalyst-gateway/bin/src/cardano/mod.rs

@@ -295,6 +295,7 @@ fn sync_subchain(
 
                     // Update flag if this is the first time reaching TIP.
                     if chain_update.tip && !follower_has_first_reached_tip() {
+                        info!("Follower has reached TIP for the first time");
                         set_follower_first_reached_tip();
                     }
 

catalyst-gateway/bin/src/service/api/health/ready_get.rs

@@ -85,7 +85,9 @@ use crate::{
     },
     service::{
         common::{responses::WithErrorResponses, types::headers::retry_after::RetryAfterOption},
-        utilities::health::{event_db_is_live, index_db_is_live, set_event_db_liveness},
+        utilities::health::{
+            condition_for_started, event_db_is_live, index_db_is_live, set_event_db_liveness,
+        },
     },
 };
 
@@ -143,16 +145,9 @@ pub(crate) async fn endpoint() -> AllResponses {
         drop(CassandraSession::wait_until_ready(INDEXING_DB_READY_WAIT_INTERVAL, true).await);
     }
 
-    let success_response = Responses::NoContent.into();
-
-    // Return 204 response if check passed initially.
-    if index_db_live && event_db_live {
-        return success_response;
-    }
-
     // Otherwise, re-check, and return 204 response if all is good.
-    if index_db_is_live() && event_db_is_live() {
-        return success_response;
+    if condition_for_started() {
+        return Responses::NoContent.into();
     }
 
     // Otherwise, return 503 response.

catalyst-gateway/bin/src/service/utilities/health/start.rs

@@ -5,6 +5,8 @@ use std::sync::atomic::{
     Ordering::{Acquire, Release},
 };
 
+use tracing::debug;
+
 /// Flag to determine if the service has started
 static STARTED: AtomicBool = AtomicBool::new(false);
 
@@ -30,7 +32,11 @@ pub(crate) fn set_to_started() {
 
 /// Returns whether the service has started or not.
 pub(crate) fn condition_for_started() -> bool {
-    event_db_is_live() && index_db_is_live() && follower_has_first_reached_tip()
+    let event_db = event_db_is_live();
+    let index_db = index_db_is_live();
+    let follower = follower_has_first_reached_tip();
+    debug!("Checking if service has started. Event DB: {event_db}, Index DB: {index_db}, Follower: {follower}");
+    event_db && index_db && follower
 }
 
 /// Returns whether the Event DB is live or not.