def __setitem__(self, key, value):
current_item_size = sum([
item.size() if type(item) == DynamoType else bytesize(str(item))
for item in (list(self.keys()) + list(self.values()))
])
new_item_size = bytesize(key) + (value.size() if type(value) ==
DynamoType else bytesize(str(value)))
# Official limit is set to 400000 (400KB)
# Manual testing confirms that the actual limit is between 409 and 410KB
# We'll set the limit to something in between to be safe
if (current_item_size + new_item_size) > 405000:
raise ItemSizeTooLarge
super(LimitedSizeDict, self).__setitem__(key, value)
def size(self):
if self.is_number():
value_size = len(str(self.value))
elif self.is_set():
sub_type = self.type[0]
value_size = sum([DynamoType({sub_type: v}).size() for v in self.value])
elif self.is_list():
value_size = sum([v.size() for v in self.value])
elif self.is_map():
value_size = sum(
[bytesize(k) + DynamoType(v).size() for k, v in self.value.items()]
)
elif type(self.value) == bool:
value_size = 1
else:
value_size = bytesize(self.value)
return value_size
def size(self):
return sum(
bytesize(key) + value.size() for key, value in self.attrs.items())