Added DbObjects

src/myfasthtml/core/dbmanager.py

@@ -0,0 +1,62 @@
+from dbengine.dbengine import DbEngine
+
+from myfasthtml.controls.helpers import Ids
+from myfasthtml.core.instances import SingleInstance, InstancesManager
+from myfasthtml.core.utils import retrieve_user_info
+
+
+class DbManager(SingleInstance):
+  def __init__(self, session, root=".myFastHtmlDb", auto_register: bool = True):
+    super().__init__(session, Ids.DbManager, auto_register=auto_register)
+    self.db = DbEngine(root=root)
+  
+  def save(self, entry, obj):
+    self.db.save(self.get_tenant(), self.get_user(), entry, obj)
+  
+  def load(self, entry):
+    return self.db.load(self.get_tenant(), entry)
+  
+  def exists_entry(self, entry):
+    return self.db.exists(self.get_tenant(), entry)
+  
+  def get_tenant(self):
+    return retrieve_user_info(self._session)["id"]
+  
+  def get_user(self):
+    return retrieve_user_info(self._session)["email"]
+
+
+class DbObject:
+  """
+  When you set the attribute, it persists in DB
+  It loads from DB at startup
+  """
+  
+  def __init__(self, session, name=None, db_manager=None):
+    self._session = session
+    self._name = name or self.__class__.__name__
+    self._db_manager = db_manager or InstancesManager.get(self._session, Ids.DbManager, DbManager)
+    
+    # init is possible
+    if self._db_manager.exists_entry(self._name):
+      props = self._db_manager.load(self._name)
+      for k, v in props.items():
+        setattr(self, k, v)
+    else:
+      self._save_self()
+  
+  def __setattr__(self, name: str, value: str):
+    if name.startswith("_"):
+      super().__setattr__(name, value)
+      return
+    
+    old_value = getattr(self, name, None)
+    if old_value == value:
+      return
+    
+    super().__setattr__(name, value)
+    self._save_self()
+  
+  def _save_self(self):
+    props = {k: getattr(self, k) for k, v in self.__class__.__dict__.items() if not k.startswith("_")}
+    self._db_manager.save(self._name, props)