universe: rename BaseBackend.MintingKeys to FetchKeys

Renamed method to better reflect its broader usage. It now applies
to both issuance proof leaves and transfer proof leaves.

Author: ffranr

tapdb/universe.go

@@ -1026,8 +1026,8 @@ func mintingKeys(ctx context.Context, dbTx BaseUniverseStore,
 	return leafKeys, nil
 }
 
-// MintingKeys returns all the keys inserted in the universe.
-func (b *BaseUniverseTree) MintingKeys(ctx context.Context,
+// FetchKeys retrieves all keys from the universe tree.
+func (b *BaseUniverseTree) FetchKeys(ctx context.Context,
 	q universe.UniverseLeafKeysQuery) ([]universe.LeafKey, error) {
 
 	var leafKeys []universe.LeafKey

tapdb/universe_test.go

@@ -363,7 +363,7 @@ func TestUniverseIssuanceProofs(t *testing.T) {
 
 	// Next, we'll query for all the available keys, this should match the
 	// number of insertions we just did.
-	mintingKeys, err := baseUniverse.MintingKeys(
+	mintingKeys, err := baseUniverse.FetchKeys(
 		ctx, universe.UniverseLeafKeysQuery{},
 	)
 	require.NoError(t, err)
@@ -435,7 +435,7 @@ func TestUniverseIssuanceProofs(t *testing.T) {
 	_, err = baseUniverse.DeleteUniverse(ctx)
 	require.NoError(t, err)
 
-	mintingKeys, err = baseUniverse.MintingKeys(
+	mintingKeys, err = baseUniverse.FetchKeys(
 		ctx, universe.UniverseLeafKeysQuery{},
 	)
 	require.NoError(t, err)

universe/interface.go

@@ -423,8 +423,8 @@ type BaseBackend interface {
 	FetchIssuanceProof(ctx context.Context,
 		key LeafKey) ([]*Proof, error)
 
-	// MintingKeys returns all the keys inserted in the universe.
-	MintingKeys(ctx context.Context,
+	// FetchKeys retrieves all keys from the universe tree.
+	FetchKeys(ctx context.Context,
 		q UniverseLeafKeysQuery) ([]LeafKey, error)
 
 	// FetchLeaves retrieves all leaves from the universe tree.