Problem: fireEvents can runs asyncously (#4)

changelog

.changelog/unreleased/improvements/4-async-fire-events.md

@@ -0,0 +1,3 @@
+- `[consensus]` run fireEvents in goroutine.
+  ([#4](https://github.com/crypto-org-chain/cometbft/pull/4))
+

state/execution.go

@@ -315,9 +315,11 @@ func (blockExec *BlockExecutor) applyBlock(state State, blockID types.BlockID, b
 		}
 	}
 
-	// Events are fired after everything else.
-	// NOTE: if we crash between Commit and Save, events wont be fired during replay
-	fireEvents(blockExec.logger, blockExec.eventBus, block, blockID, abciResponse, validatorUpdates)
+	if _, ok := blockExec.eventBus.(types.NopEventBus); !ok {
+		// Events are fired after everything else.
+		// NOTE: if we crash between Commit and Save, events wont be fired during replay
+		go fireEvents(blockExec.logger, blockExec.eventBus, block, blockID, abciResponse, validatorUpdates)
+	}
 
 	return state, nil
 }