tapdb: use AssetLeafKey for new burn tree

This ensures that we avoid collision issues when an output has multiple
assets that have the same script key and same group key. The asset ID
will now be the tie breaker here.

Author: Roasbeef

tapdb/burn_tree.go

@@ -229,13 +229,16 @@ func decodeAndBuildAuthBurnLeaf(dbLeaf UniverseLeaf) (
 	}
 	scriptKey := asset.NewScriptKey(scriptPub)
 
-	leafKey := universe.BaseLeafKey{
-		OutPoint:  burnProof.OutPoint(),
-		ScriptKey: &scriptKey,
+	leafKey := universe.AssetLeafKey{
+		BaseLeafKey: universe.BaseLeafKey{
+			OutPoint:  burnProof.OutPoint(),
+			ScriptKey: &scriptKey,
+		},
+		AssetID: burnProof.Asset.ID(),
 	}
 
 	burnLeaf := &universe.BurnLeaf{
-		UniverseKey: leafKey,
+		UniverseKey: &leafKey,
 		BurnProof:   &burnProof,
 	}
 

tapdb/burn_tree_test.go

@@ -42,9 +42,12 @@ func createBurnLeaf(t *testing.T) *universe.BurnLeaf {
 	scriptKey := asset.RandScriptKey(t)
 
 	return &universe.BurnLeaf{
-		UniverseKey: universe.BaseLeafKey{
-			OutPoint:  burnProof.OutPoint(),
-			ScriptKey: &scriptKey,
+		UniverseKey: universe.AssetLeafKey{
+			BaseLeafKey: universe.BaseLeafKey{
+				OutPoint:  burnProof.OutPoint(),
+				ScriptKey: &scriptKey,
+			},
+			AssetID: burnProof.Asset.ID(),
 		},
 		BurnProof: burnProof,
 	}
@@ -189,9 +192,12 @@ func TestBurnUniverseTreeInsertBurns(t *testing.T) {
 		}
 
 		nonBurnLeaf := &universe.BurnLeaf{
-			UniverseKey: universe.BaseLeafKey{
-				OutPoint:  op,
-				ScriptKey: &a.ScriptKey,
+			UniverseKey: universe.AssetLeafKey{
+				BaseLeafKey: universe.BaseLeafKey{
+					OutPoint:  op,
+					ScriptKey: &a.ScriptKey,
+				},
+				AssetID: a.ID(),
 			},
 			BurnProof: nonBurnProof,
 		}

universe/interface.go

@@ -1320,7 +1320,7 @@ type IgnoreTree interface {
 // BurnLeaf is a type that represents a burn leaf within the universe tree.
 type BurnLeaf struct {
 	// UniverseKey is the key that the burn leaf is stored at.
-	UniverseKey LeafKey
+	UniverseKey UniqueLeafKey
 
 	// BurnProof is the burn proof that is stored within the burn leaf.
 	BurnProof *proof.Proof