[bug] Fix sqlite empty address issue (#370)

* error when empty address has been set for sqlite

* better explain sqlite db-address setting

internal/db/bundb/bundb.go

@@ -204,7 +204,11 @@ func NewBunDBService(ctx context.Context) (db.DB, error) {
 }
 
 func sqliteConn(ctx context.Context) (*DBConn, error) {
+	// validate db address has actually been set
 	dbAddress := viper.GetString(config.Keys.DbAddress)
+	if dbAddress == "" {
+		return nil, fmt.Errorf("'%s' was not set when attempting to start sqlite", config.Keys.DbAddress)
+	}
 
 	// Drop anything fancy from DB address
 	dbAddress = strings.Split(dbAddress, "?")[0]

internal/db/bundb/bundbnew_test.go

@@ -0,0 +1,52 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package bundb_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/spf13/viper"
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/internal/config"
+	"github.com/superseriousbusiness/gotosocial/internal/db/bundb"
+)
+
+type BundbNewTestSuite struct {
+	BunDBStandardTestSuite
+}
+
+func (suite *BundbNewTestSuite) TestCreateNewDB() {
+	// create a new db with standard test settings
+	db, err := bundb.NewBunDBService(context.Background())
+	suite.NoError(err)
+	suite.NotNil(db)
+}
+
+func (suite *BundbNewTestSuite) TestCreateNewSqliteDBNoAddress() {
+	// create a new db with no address specified
+	viper.Set(config.Keys.DbAddress, "")
+	db, err := bundb.NewBunDBService(context.Background())
+	suite.EqualError(err, "'db-address' was not set when attempting to start sqlite")
+	suite.Nil(db)
+}
+
+func TestBundbNewTestSuite(t *testing.T) {
+	suite.Run(t, new(BundbNewTestSuite))
+}