Feat: added BundleTailHash to Transaction metadata

packages/model/transactionmetadata/transactionmetadata.go

@@ -15,6 +15,8 @@ import (
 type TransactionMetadata struct {
 	hash                ternary.Trytes
 	hashMutex           sync.RWMutex
+	bundleTailHash      ternary.Trytes
+	bundleTailHashMutex sync.RWMutex
 	receivedTime        time.Time
 	receivedTimeMutex   sync.RWMutex
 	solid               bool
@@ -65,6 +67,29 @@ func (metadata *TransactionMetadata) SetHash(hash ternary.Trytes) {
 	}
 }
 
+func (metadata *TransactionMetadata) GetBundleTailHash() ternary.Trytes {
+	metadata.bundleTailHashMutex.RLock()
+	defer metadata.bundleTailHashMutex.RUnlock()
+
+	return metadata.bundleTailHash
+}
+
+func (metadata *TransactionMetadata) SetBundleTailHash(bundleTailHash ternary.Trytes) {
+	metadata.bundleTailHashMutex.RLock()
+	if metadata.bundleTailHash != bundleTailHash {
+		metadata.bundleTailHashMutex.RUnlock()
+		metadata.bundleTailHashMutex.Lock()
+		defer metadata.bundleTailHashMutex.Unlock()
+		if metadata.bundleTailHash != bundleTailHash {
+			metadata.bundleTailHash = bundleTailHash
+
+			metadata.SetModified(true)
+		}
+	} else {
+		metadata.bundleTailHashMutex.RUnlock()
+	}
+}
+
 func (metadata *TransactionMetadata) GetReceivedTime() time.Time {
 	metadata.receivedTimeMutex.RLock()
 	defer metadata.receivedTimeMutex.RUnlock()