[Config] Group.__call__() has same behaviour as Group.all() (#2018)

* Make calling groups useful

This makes config.Group.__call__ effectively an alias for Group.all(),
with the added bonus of becoming a context manager.

get_raw has been updated as well to reflect the new behaviour of
__call__.

* Fix unintended side-effects of new behaviour

* Add tests

* Add test for get_raw mixing in defaults

* Another cleanup for relying on old behaviour internally

* Fix bank relying on old behaviour

* Reformat

redbot/core/bank.py

@@ -400,19 +400,18 @@ async def get_account(member: Union[discord.Member, discord.User]) -> Account:
 
     """
     if await is_global():
-        acc_data = (await _conf.user(member)()).copy()
-        default = _DEFAULT_USER.copy()
+        all_accounts = await _conf.all_users()
     else:
-        acc_data = (await _conf.member(member)()).copy()
-        default = _DEFAULT_MEMBER.copy()
+        all_accounts = await _conf.all_members(member.guild)
 
-    if acc_data == {}:
-        acc_data = default
-        acc_data["name"] = member.display_name
+    if member.id not in all_accounts:
+        acc_data = {"name": member.display_name, "created_at": _DEFAULT_MEMBER["created_at"]}
         try:
             acc_data["balance"] = await get_default_balance(member.guild)
         except AttributeError:
             acc_data["balance"] = await get_default_balance()
+    else:
+        acc_data = all_accounts[member.id]
 
     acc_data["created_at"] = _decode_time(acc_data["created_at"])
     return Account(**acc_data)

redbot/core/config.py

@@ -1,7 +1,7 @@
 import logging
 import collections
 from copy import deepcopy
-from typing import Union, Tuple, TYPE_CHECKING
+from typing import Any, Union, Tuple, Dict, Awaitable, AsyncContextManager, TypeVar, TYPE_CHECKING
 
 import discord
 
@@ -13,8 +13,10 @@
 
 log = logging.getLogger("red.config")
 
+_T = TypeVar("_T")
 
-class _ValueCtxManager:
+
+class _ValueCtxManager(Awaitable[_T], AsyncContextManager[_T]):
     """Context manager implementation of config values.
 
     This class allows mutable config values to be both "get" and "set" from
@@ -46,7 +48,7 @@ async def __aenter__(self):
             )
         return self.raw_value
 
-    async def __aexit__(self, *exc_info):
+    async def __aexit__(self, exc_type, exc, tb):
         if self.raw_value != self.__original_value:
             await self.value_obj.set(self.raw_value)
 
@@ -76,14 +78,14 @@ def __init__(self, identifiers: Tuple[str], default_value, driver):
     def identifiers(self):
         return tuple(str(i) for i in self._identifiers)
 
-    async def _get(self, default):
+    async def _get(self, default=...):
         try:
             ret = await self.driver.get(*self.identifiers)
         except KeyError:
-            return default if default is not None else self.default
+            return default if default is not ... else self.default
         return ret
 
-    def __call__(self, default=None):
+    def __call__(self, default=...) -> _ValueCtxManager[Any]:
         """Get the literal value of this data element.
 
         Each `Value` object is created by the `Group.__getattr__` method. The
@@ -187,6 +189,11 @@ def __init__(
     def defaults(self):
         return deepcopy(self._defaults)
 
+    async def _get(self, default: Dict[str, Any] = ...) -> Dict[str, Any]:
+        default = default if default is not ... else self.defaults
+        raw = await super()._get(default)
+        return self.nested_update(raw, default)
+
     # noinspection PyTypeChecker
     def __getattr__(self, item: str) -> Union["Group", Value]:
         """Get an attribute of this group.
@@ -306,6 +313,11 @@ async def get_raw(self, *nested_path: str, default=...):
             data = {"foo": {"bar": "baz"}}
             d = data["foo"]["bar"]
 
+        Note
+        ----
+        If retreiving a sub-group, the return value of this method will
+        include registered defaults for values which have not yet been set.
+
         Parameters
         ----------
         nested_path : str
@@ -339,15 +351,22 @@ async def get_raw(self, *nested_path: str, default=...):
                 default = poss_default
 
         try:
-            return await self.driver.get(*self.identifiers, *path)
+            raw = await self.driver.get(*self.identifiers, *path)
         except KeyError:
             if default is not ...:
                 return default
             raise
+        else:
+            if isinstance(default, dict):
+                return self.nested_update(raw, default)
+            return raw
 
-    async def all(self) -> dict:
+    def all(self) -> _ValueCtxManager[Dict[str, Any]]:
         """Get a dictionary representation of this group's data.
 
+        The return value of this method can also be used as an asynchronous
+        context manager, i.e. with :code:`async with` syntax.
+
         Note
         ----
         The return value of this method will include registered defaults for
@@ -359,16 +378,18 @@ async def all(self) -> dict:
             All of this Group's attributes, resolved as raw data values.
 
         """
-        return self.nested_update(await self())
+        return self()
 
-    def nested_update(self, current, defaults=None):
+    def nested_update(
+        self, current: collections.Mapping, defaults: Dict[str, Any] = ...
+    ) -> Dict[str, Any]:
         """Robust updater for nested dictionaries
 
         If no defaults are passed, then the instance attribute 'defaults'
         will be used.
 
         """
-        if not defaults:
+        if defaults is ...:
             defaults = self.defaults
 
         for key, value in current.items():
@@ -844,7 +865,7 @@ def custom(self, group_identifier: str, *identifiers: str):
         """
         return self._get_base_group(group_identifier, *identifiers)
 
-    async def _all_from_scope(self, scope: str):
+    async def _all_from_scope(self, scope: str) -> Dict[int, Dict[Any, Any]]:
         """Get a dict of all values from a particular scope of data.
 
         :code:`scope` must be one of the constants attributed to
@@ -856,12 +877,18 @@ async def _all_from_scope(self, scope: str):
         overwritten.
         """
         group = self._get_base_group(scope)
-        dict_ = await group()
         ret = {}
-        for k, v in dict_.items():
-            data = group.defaults
-            data.update(v)
-            ret[int(k)] = data
+
+        try:
+            dict_ = await self.driver.get(*group.identifiers)
+        except KeyError:
+            pass
+        else:
+            for k, v in dict_.items():
+                data = group.defaults
+                data.update(v)
+                ret[int(k)] = data
+
         return ret
 
     async def all_guilds(self) -> dict:
@@ -968,13 +995,21 @@ async def all_members(self, guild: discord.Guild = None) -> dict:
         ret = {}
         if guild is None:
             group = self._get_base_group(self.MEMBER)
-            dict_ = await group()
-            for guild_id, guild_data in dict_.items():
-                ret[int(guild_id)] = self._all_members_from_guild(group, guild_data)
+            try:
+                dict_ = await self.driver.get(*group.identifiers)
+            except KeyError:
+                pass
+            else:
+                for guild_id, guild_data in dict_.items():
+                    ret[int(guild_id)] = self._all_members_from_guild(group, guild_data)
         else:
             group = self._get_base_group(self.MEMBER, guild.id)
-            guild_data = await group()
-            ret = self._all_members_from_guild(group, guild_data)
+            try:
+                guild_data = await self.driver.get(*group.identifiers)
+            except KeyError:
+                pass
+            else:
+                ret = self._all_members_from_guild(group, guild_data)
         return ret
 
     async def _clear_scope(self, *scopes: str):

tests/core/test_config.py

@@ -430,3 +430,39 @@ async def test_set_then_mutate(config):
     list1.append("foo")
     list1 = await config.list1()
     assert "foo" not in list1
+
+
+@pytest.mark.asyncio
+async def test_call_group_fills_defaults(config):
+    config.register_global(subgroup={"foo": True})
+    subgroup = await config.subgroup()
+    assert "foo" in subgroup
+
+
+@pytest.mark.asyncio
+async def test_group_call_ctxmgr_writes(config):
+    config.register_global(subgroup={"foo": True})
+    async with config.subgroup() as subgroup:
+        subgroup["bar"] = False
+
+    subgroup = await config.subgroup()
+    assert subgroup == {"foo": True, "bar": False}
+
+
+@pytest.mark.asyncio
+async def test_all_works_as_ctxmgr(config):
+    config.register_global(subgroup={"foo": True})
+    async with config.subgroup.all() as subgroup:
+        subgroup["bar"] = False
+
+    subgroup = await config.subgroup()
+    assert subgroup == {"foo": True, "bar": False}
+
+
+@pytest.mark.asyncio
+async def test_get_raw_mixes_defaults(config):
+    config.register_global(subgroup={"foo": True})
+    await config.subgroup.set_raw("bar", value=False)
+
+    subgroup = await config.get_raw("subgroup")
+    assert subgroup == {"foo": True, "bar": False}