fix(sql storage): Query() should return ErrReleaseNotFound immediately when no records are found

Signed-off-by: Mike Ng <ming@redhat.com>

pkg/storage/driver/sql.go

@@ -310,6 +310,10 @@ func (s *SQL) Query(labels map[string]string) ([]*rspb.Release, error) {
 		return nil, err
 	}
 
+	if len(records) == 0 {
+		return nil, ErrReleaseNotFound
+	}
+
 	var releases []*rspb.Release
 	for _, record := range records {
 		release, err := decodeRelease(record.Body)
@@ -320,10 +324,6 @@ func (s *SQL) Query(labels map[string]string) ([]*rspb.Release, error) {
 		releases = append(releases, release)
 	}
 
-	if len(releases) == 0 {
-		return nil, ErrReleaseNotFound
-	}
-
 	return releases, nil
 }
 

pkg/storage/driver/sql_test.go

@@ -292,6 +292,11 @@ func TestSqlUpdate(t *testing.T) {
 
 func TestSqlQuery(t *testing.T) {
 	// Reflect actual use cases in ../storage.go
+	labelSetUnknown := map[string]string{
+		"name":   "smug-pigeon",
+		"owner":  sqlReleaseDefaultOwner,
+		"status": "unknown",
+	}
 	labelSetDeployed := map[string]string{
 		"name":   "smug-pigeon",
 		"owner":  sqlReleaseDefaultOwner,
@@ -320,6 +325,15 @@ func TestSqlQuery(t *testing.T) {
 		sqlReleaseTableNamespaceColumn,
 	)
 
+	mock.
+		ExpectQuery(regexp.QuoteMeta(query)).
+		WithArgs("smug-pigeon", sqlReleaseDefaultOwner, "unknown", "default").
+		WillReturnRows(
+			mock.NewRows([]string{
+				sqlReleaseTableBodyColumn,
+			}),
+		).RowsWillBeClosed()
+
 	mock.
 		ExpectQuery(regexp.QuoteMeta(query)).
 		WithArgs("smug-pigeon", sqlReleaseDefaultOwner, "deployed", "default").
@@ -353,6 +367,13 @@ func TestSqlQuery(t *testing.T) {
 			),
 		).RowsWillBeClosed()
 
+	_, err := sqlDriver.Query(labelSetUnknown)
+	if err == nil {
+		t.Errorf("Expected error {%v}, got nil", ErrReleaseNotFound)
+	} else if err != ErrReleaseNotFound {
+		t.Fatalf("failed to query for unknown smug-pigeon release: %v", err)
+	}
+
 	results, err := sqlDriver.Query(labelSetDeployed)
 	if err != nil {
 		t.Fatalf("failed to query for deployed smug-pigeon release: %v", err)