support callback with submulti

tests/test_submulti.py

@@ -433,6 +433,20 @@ async def test_callback_submulti():
     assert not await list_sessions()
 
 
+@pytest.mark.asyncio
+async def test_callback_submulti_follower():
+    multi = StrOption('multi', '', multi=True)
+    multi2 = StrOption('multi2', '', Calculation(return_list), multi=submulti)
+    od = Leadership('multi', '', [multi, multi2])
+    od = OptionDescription('multi', '', [od])
+    async with await Config(od) as cfg:
+        await cfg.property.read_write()
+        assert await cfg.option('multi.multi').value.get() == []
+        await cfg.option('multi.multi').value.set(['val'])
+        assert await cfg.option('multi.multi2', 0).value.get() == ['val', 'val']
+    assert not await list_sessions()
+
+
 @pytest.mark.asyncio
 async def test_submulti_unique():
     i = IntOption('int', '', multi=submulti, properties=('unique',))

tiramisu/autolib.py

@@ -415,7 +415,7 @@ async def carry_out_calculation(option,
                     args,
                     kwargs)
     if isinstance(ret, list) and not option.impl_is_dynoptiondescription() and \
-            option.impl_is_follower():
+            option.impl_is_follower() and not option.impl_is_submulti():
         if args or kwargs:
             raise LeadershipError(_('the "{}" function with positional arguments "{}" '
                                     'and keyword arguments "{}" must not return '

tiramisu/value.py

@@ -198,7 +198,19 @@ class Values:
         # now try to get default value:
         value = await self.calc_value(option_bag,
                                       option_bag.option.impl_getdefault())
-        if option_bag.option.impl_is_multi() and option_bag.index is not None and isinstance(value, (list, tuple)):
+        if option_bag.index is not None and isinstance(value, (list, tuple)):
+            if value and option_bag.option.impl_is_submulti():
+                # first index is a list, assume other data are list too
+                if isinstance(value[0], list):
+                    # if index, must return good value for this index
+                    if len(value) > option_bag.index:
+                        value = value[option_bag.index]
+                    else:
+                        # no value for this index, retrieve default multi value
+                        # default_multi is already a list for submulti
+                        value = await self.calc_value(option_bag,
+                                                      option_bag.option.impl_getdefault_multi())
+            elif option_bag.option.impl_is_multi():
                 # if index, must return good value for this index
                 if len(value) > option_bag.index:
                     value = value[option_bag.index]