Centralize logic for default POS batch handler

wuttapos/app.py

@@ -32,6 +32,7 @@ from rattail.config import make_config
 import flet as ft
 
 import wuttapos
+from wuttapos.util import get_pos_batch_handler
 
 
 def main(page: ft.Page):
@@ -62,7 +63,7 @@ def main(page: ft.Page):
         page.shared.pop('cust_uuid', None) # TODO
         page.shared.pop('cust_display', None) # TODO
         if page.shared and page.shared.get('user_uuid'):
-            handler = app.get_batch_handler('pos')
+            handler = get_pos_batch_handler(config)
             session = app.make_session()
             user = session.get(model.User, page.shared['user_uuid'])
             if user:

wuttapos/util.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  WuttaPOS -- Pythonic Point of Sale System
+#  Copyright © 2023 Lance Edgar
+#
+#  This file is part of WuttaPOS.
+#
+#  WuttaPOS is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  WuttaPOS is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  WuttaPOS.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+WuttaPOS utilities
+"""
+
+
+def get_pos_batch_handler(config):
+    """
+    Official way of obtaining the POS batch handler.
+
+    Code should use this where possible to make later refactoring
+    easier, should it be needed.
+    """
+    app = config.get_app()
+    return app.get_batch_handler('pos', default='rattail.batch.pos:POSBatchHandler')

wuttapos/views/pos.py

@@ -32,6 +32,8 @@ import flet as ft
 
 from .base import WuttaView
 from wuttapos.controls.keyboard import WuttaKeyboard
+from wuttapos.util import get_pos_batch_handler
+
 
 log = logging.getLogger(__name__)
 
@@ -48,7 +50,7 @@ class POSView(WuttaView):
     disabled_bgcolor = '#aaaaaa'
 
     def get_batch_handler(self):
-        return self.app.get_batch_handler('pos')
+        return get_pos_batch_handler(self.config)
 
     def set_customer(self, customer, batch=None):
         session = self.app.get_session(customer)
@@ -744,7 +746,7 @@ class POSView(WuttaView):
     def get_current_batch(self, session, user=None, create=True):
         if not user:
             user = session.get(self.model.User, self.page.shared['user_uuid'])
-        handler = self.app.get_batch_handler('pos')
+        handler = self.get_batch_handler()
         return handler.get_current_batch(user, create=create)
 
     def did_mount(self):
@@ -805,7 +807,7 @@ class POSView(WuttaView):
 
             model = self.model
             session = self.app.make_session()
-            handler = self.app.get_batch_handler('pos')
+            handler = self.get_batch_handler()
             user = session.get(model.User, self.page.shared['user_uuid'])
             batch = handler.get_current_batch(user, create=True)
 
@@ -862,7 +864,7 @@ class POSView(WuttaView):
     def tender_click(self, e):
         model = self.model
         session = self.app.make_session()
-        handler = self.app.get_batch_handler('pos')
+        handler = self.get_batch_handler()
         user = session.get(model.User, self.page.shared['user_uuid'])
         batch = handler.get_current_batch(user)
 
@@ -902,7 +904,7 @@ class POSView(WuttaView):
             self.page.update()
             return
 
-        handler = self.app.get_batch_handler('pos')
+        handler = self.get_batch_handler()
         session = self.app.make_session()
         model = self.model