feat(settings): add settings management (#906)

api/bolt/settings_service.go

@@ -0,0 +1,61 @@
+package bolt
+
+import (
+	"github.com/portainer/portainer"
+	"github.com/portainer/portainer/bolt/internal"
+
+	"github.com/boltdb/bolt"
+)
+
+// SettingsService represents a service to manage application settings.
+type SettingsService struct {
+	store *Store
+}
+
+const (
+	dbSettingsKey = "SETTINGS"
+)
+
+// Settings retrieve the settings object.
+func (service *SettingsService) Settings() (*portainer.Settings, error) {
+	var data []byte
+	err := service.store.db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(settingsBucketName))
+		value := bucket.Get([]byte(dbSettingsKey))
+		if value == nil {
+			return portainer.ErrSettingsNotFound
+		}
+
+		data = make([]byte, len(value))
+		copy(data, value)
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	var settings portainer.Settings
+	err = internal.UnmarshalSettings(data, &settings)
+	if err != nil {
+		return nil, err
+	}
+	return &settings, nil
+}
+
+// StoreSettings persists a Settings object.
+func (service *SettingsService) StoreSettings(settings *portainer.Settings) error {
+	return service.store.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(settingsBucketName))
+
+		data, err := internal.MarshalSettings(settings)
+		if err != nil {
+			return err
+		}
+
+		err = bucket.Put([]byte(dbSettingsKey), data)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+}