Initial import from Docker volume

model/digits.py

@@ -0,0 +1,34 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from trytond.cache import Cache
+from trytond.rpc import RPC
+
+
+class DigitsMixin:
+    __slots__ = ()
+
+    _digits_cache = Cache('_digits_mixin..get_digits', context=False)
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        cls.__rpc__.update({
+                'get_digits': RPC(instantiate=0, cache=dict(days=1)),
+                })
+
+    def get_digits(self):
+        key = str(self)
+        digits = self._digits_cache.get(key)
+        if digits is not None:
+            return digits
+        digits = self._get_digits()
+        self._digits_cache.set(key, digits)
+        return digits
+
+    def _get_digits(self):
+        return (16, self.digits)
+
+    @classmethod
+    def write(cls, *args):
+        super().write(*args)
+        cls._digits_cache.clear()