fix: post-merge robustness - global_state cleanup count, swap bounds, blockhash & i32 index

- global_state: only decrement signature_count when remove() actually removed entry
- types: bounds-check program_id_index and account indices in swap extraction
- types: require data.len() >= 9/12 before slicing token instruction data
- types: use i32 for current_index and safe skip count to avoid i8 truncation/UB
- event_parser: encode recent_blockhash only when len() == 32; pass i32 to swap parsers

Made-with: Cursor

src/streaming/event_parser/core/event_parser.rs

@@ -82,7 +82,7 @@ impl EventParser {
                     .collect();
                 // 解析指令事件
                 let instructions = &message.instructions;
-                let recent_blockhash = if message.recent_blockhash.is_empty() {
+                let recent_blockhash = if message.recent_blockhash.len() != 32 {
                     None
                 } else {
                     Some(solana_sdk::bs58::encode(&message.recent_blockhash).into_string())
@@ -434,7 +434,7 @@ impl EventParser {
                 if let Some(swap_data) = parse_swap_data_from_next_grpc_instructions(
                     &event,
                     inner_instructions_ref,
-                    current_inner_idx as i8,
+                    current_inner_idx,
                     accounts,
                 ) {
                     event.metadata_mut().set_swap_data(swap_data);
@@ -602,7 +602,7 @@ impl EventParser {
                         parse_swap_data_from_next_instructions(
                             &event,
                             inner_instructions_ref,
-                            current_inner_idx as i8,
+                            current_inner_idx,
                             accounts,
                         )
                     } else {

src/streaming/event_parser/core/global_state.rs

@@ -55,10 +55,11 @@ impl GlobalState {
             .map(|entry| *entry.key())
             .collect();
 
-        // Remove old signatures atomically
+        // Remove old signatures atomically; only decrement count when entry was present
         for signature in signatures_to_remove {
-            self.signature_data.remove(&signature);
-            self.signature_count.fetch_sub(1, Ordering::Relaxed);
+            if self.signature_data.remove(&signature).is_some() {
+                self.signature_count.fetch_sub(1, Ordering::Relaxed);
+            }
         }
     }