Fix StructTag conversion for iotax_queryEvents Indexer-RPC method (…

…#4289)

* fix: convert the struct tag into a complete canonical string in order for the indexer's `MoveEventType` filter to work

* fix: clippy

crates/iota-indexer/src/indexer_reader.rs

@@ -1161,7 +1161,8 @@ impl<U: R2D2Connection> IndexerReader<U> {
                     )
                 }
                 EventFilter::MoveEventType(struct_tag) => {
-                    format!("event_type = '{}'", struct_tag)
+                    let formatted_struct_tag = struct_tag.to_canonical_string(true);
+                    format!("event_type = '{formatted_struct_tag}'")
                 }
                 EventFilter::MoveEventModule { package, module } => {
                     let package_module_prefix = format!("{}::{}", package.to_hex_literal(), module);

crates/iota-indexer/tests/rpc-tests/indexer_api.rs

@@ -185,6 +185,38 @@ fn query_events_supported_events() {
     });
 }
 
+#[test]
+fn query_validator_epoch_info_event() {
+    let ApiTestSetup {
+        runtime,
+        store,
+        client,
+        cluster,
+    } = ApiTestSetup::get_or_init();
+
+    runtime.block_on(async move {
+        indexer_wait_for_checkpoint(store, 1).await;
+
+        cluster.force_new_epoch().await;
+
+        let result = client.query_events(EventFilter::MoveEventType("0x0000000000000000000000000000000000000000000000000000000000000003::validator_set::ValidatorEpochInfoEventV1".parse().unwrap()), None, None, None).await;
+        assert!(result.is_ok());
+        assert!(!result.unwrap().data.is_empty());
+
+        let result = client.query_events(EventFilter::MoveEventType("0x3::validator_set::ValidatorEpochInfoEventV1".parse().unwrap()), None, None, None).await;
+        assert!(result.is_ok());
+        assert!(!result.unwrap().data.is_empty());
+
+        let result = client.query_events(EventFilter::MoveEventType("0x0003::validator_set::ValidatorEpochInfoEventV1".parse().unwrap()), None, None, None).await;
+        assert!(result.is_ok());
+        assert!(!result.unwrap().data.is_empty());
+
+        let result = client.query_events(EventFilter::MoveEventType("0x1::validator_set::ValidatorEpochInfoEventV1".parse().unwrap()), None, None, None).await;
+        assert!(result.is_ok());
+        assert!(result.unwrap().data.is_empty());
+    });
+}
+
 #[test]
 fn test_get_owned_objects() -> Result<(), anyhow::Error> {
     let ApiTestSetup {