datastore: support custom knodes instead of nemubotstate

nemubot/datastore/abstract.py

@@ -32,16 +32,20 @@ class Abstract:
     def close(self):
         return
 
-    def load(self, module):
+    def load(self, module, knodes):
         """Load data for the given module
 
         Argument:
         module -- the module name of data to load
+        knodes -- the schema to use to load the datas
 
         Return:
         The loaded data
         """
 
+        if knodes is not None:
+            return None
+
         return self.new()
 
     def save(self, module, data):

nemubot/datastore/xml.py

@@ -83,27 +83,38 @@ class XML(Abstract):
 
         return os.path.join(self.basedir, module + ".xml")
 
-    def load(self, module):
+    def load(self, module, knodes):
         """Load data for the given module
 
         Argument:
         module -- the module name of data to load
+        knodes -- the schema to use to load the datas
         """
 
         data_file = self._get_data_file_path(module)
 
+        if knodes is None:
+            from nemubot.tools.xmlparser import parse_file
+            def _true_load(path):
+                return parse_file(path)
+
+        else:
+            from nemubot.tools.xmlparser import XMLParser
+            p = XMLParser(knodes)
+            def _true_load(path):
+                return p.parse_file(path)
+
         # Try to load original file
         if os.path.isfile(data_file):
-            from nemubot.tools.xmlparser import parse_file
             try:
-                return parse_file(data_file)
+                return _true_load(data_file)
             except xml.parsers.expat.ExpatError:
                 # Try to load from backup
                 for i in range(10):
                     path = data_file + "." + str(i)
                     if os.path.isfile(path):
                         try:
-                            cnt = parse_file(path)
+                            cnt = _true_load(path)
 
                             logger.warn("Restoring from backup: %s", path)
 
@@ -112,7 +123,7 @@ class XML(Abstract):
                             continue
 
         # Default case: initialize a new empty datastore
-        return Abstract.load(self, module)
+        return super().load(module, knodes)
 
     def _rotate(self, path):
         """Backup given path
@@ -143,6 +154,9 @@ class XML(Abstract):
         if self.rotate:
             self._rotate(path)
 
+        if data is None:
+            return
+
         import tempfile
         _, tmpath = tempfile.mkstemp()
         with open(tmpath, "w") as f: