1 files changed, 57 insertions, 0 deletions
diff --git a/common/db.go b/common/db.go
new file mode 100644
index 0000000..76e39a2
--- /dev/null
+++ b/common/db.go
@@ -0,0 +1,57 @@
+package common
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+	"fmt"
+	"log/slog"
+	"path"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/nyttikord/avl"
+)
+
+var regexpMigration = regexp.MustCompile(`(\d{3})-(.*)\.sql`)
+
+type migrationData struct {
+	id      uint64
+	name    string
+	content string
+}
+
+func Migrate(ctx context.Context, log *slog.Logger, db *sql.DB, migrations embed.FS, dir string) error {
+	entries, err := migrations.ReadDir(dir)
+	if err != nil {
+		return err
+	}
+	tree := avl.NewKeySimple[uint64, migrationData]()
+	for _, entry := range entries {
+		if strings.HasSuffix(entry.Name(), ".sql") {
+			log.Debug("reading migration...", "path", dir+"/"+entry.Name())
+			subs := regexpMigration.FindStringSubmatch(entry.Name())
+			if len(subs) < 3 {
+				return fmt.Errorf("invalid migration name %s", entry.Name())
+			}
+			id, _ := strconv.ParseUint(subs[1], 10, 16)
+			b, err := migrations.ReadFile(path.Join(dir, entry.Name()))
+			if err != nil {
+				return err
+			}
+			tree.Insert(id, migrationData{id, subs[2], string(b)})
+		} else {
+			log.Warn("invalid migration entry, skipping", "path", dir+"/"+entry.Name())
+		}
+	}
+	for _, mig := range tree.Sort() {
+		log.Debug("migrating...", "id", mig.id, "name", mig.name)
+		_, err := db.ExecContext(ctx, mig.content)
+		if err != nil {
+			log.Error("migrating", "id", mig.id, "name", mig.name)
+			return err
+		}
+	}
+	return nil
+}