Initial add backend stuff

l4g/database.go

@@ -0,0 +1,41 @@
+package l4g
+
+import (
+	"os"
+)
+
+// dbWriter is the app-supplied sink that persists a log Entry to the database.
+// The framework cannot import the app's repository, so the app registers a
+// writer at startup via SetDatabaseWriter. If none is registered, the database
+// logger falls back to the terminal so log lines are never silently dropped.
+var dbWriter func(Entry) error
+
+// SetDatabaseWriter registers the function the database logger uses to persist
+// entries. Apps typically wire it to their repository:
+//
+//	l4g.SetDatabaseWriter(func(e l4g.Entry) error {
+//	    return repository.InsertLogEntry(context.Background(), models.LogEntry(e))
+//	})
+func SetDatabaseWriter(w func(Entry) error) { dbWriter = w }
+
+type DatabaseLogger struct{}
+
+func NewDatabaseLogger() *DatabaseLogger {
+	return &DatabaseLogger{}
+}
+
+func (d *DatabaseLogger) Write(entry Entry) error {
+	if dbWriter == nil {
+		return NewTerminalLogger().Write(entry)
+	}
+	return dbWriter(entry)
+}
+
+func (d *DatabaseLogger) Fatal(entry Entry) error {
+	err := d.Write(entry)
+	if err != nil {
+		return err
+	}
+	os.Exit(1)
+	return nil
+}