refactor: migrations structure

fix: cascade for alias user foreign key constraint

migrations/migrations.go

@@ -0,0 +1,67 @@
+package migrations
+
+import (
+	"github.com/emvi/logbuch"
+	"github.com/muety/wakapi/config"
+	"gorm.io/gorm"
+	"sort"
+	"strings"
+)
+
+type migrationFunc struct {
+	f    func(db *gorm.DB, cfg *config.Config) error
+	name string
+}
+
+type migrationFuncs []migrationFunc
+
+var (
+	preMigrations  migrationFuncs
+	postMigrations migrationFuncs
+)
+
+func registerPreMigration(f migrationFunc) {
+	preMigrations = append(preMigrations, f)
+}
+
+func registerPostMigration(f migrationFunc) {
+	postMigrations = append(postMigrations, f)
+}
+
+// NOTE: Currently, migrations themselves keep track
+// of whether they have run, yet or not, because some
+// simply run on every start.
+
+func RunPreMigrations(db *gorm.DB, cfg *config.Config) {
+	sort.Sort(preMigrations)
+
+	for _, m := range preMigrations {
+		logbuch.Info("potentially running migration '%s'", m.name)
+		if err := m.f(db, cfg); err != nil {
+			logbuch.Fatal("migration '%s' failed – %v", m.name, err)
+		}
+	}
+}
+
+func RunCustomPostMigrations(db *gorm.DB, cfg *config.Config) {
+	sort.Sort(postMigrations)
+
+	for _, m := range postMigrations {
+		logbuch.Info("potentially running migration '%s'", m.name)
+		if err := m.f(db, cfg); err != nil {
+			logbuch.Fatal("migration '%s' failed – %v", m.name, err)
+		}
+	}
+}
+
+func (m migrationFuncs) Len() int {
+	return len(m)
+}
+
+func (m migrationFuncs) Less(i, j int) bool {
+	return strings.Compare(m[i].name, m[j].name) < 0
+}
+
+func (m migrationFuncs) Swap(i, j int) {
+	m[i], m[j] = m[j], m[i]
+}