Add method to fetch parents for child hotkeys

bittensor/core/async_subtensor.py

@@ -973,6 +973,47 @@ async def get_block_hash(self, block: Optional[int] = None) -> str:
         else:
             return await self.substrate.get_chain_head()
 
+    async def get_parents(
+        self,
+        hotkey: str,
+        netuid: int,
+        block: Optional[int] = None,
+        block_hash: Optional[str] = None,
+        reuse_block: bool = False,
+    ) -> list[tuple[float, str]]:
+        """
+        This method retrieves the parent of a given hotkey and netuid. It queries the SubtensorModule's ParentKeys
+            storage function to get the children and formats them before returning as a tuple.
+
+        Arguments:
+            hotkey: The child hotkey SS58.
+            netuid: The netuid value.
+            block: The block number for which the children are to be retrieved.
+            block_hash: The hash of the block to retrieve the subnet unique identifiers from.
+            reuse_block: Whether to reuse the last-used block hash.
+
+        Returns:
+            A list of formatted parents [(proportion, parent)]
+        """
+        block_hash = await self.determine_block_hash(block, block_hash, reuse_block)
+        parents = await self.substrate.query(
+            module="SubtensorModule",
+            storage_function="ParentKeys",
+            params=[hotkey, netuid],
+            block_hash=block_hash,
+            reuse_block_hash=reuse_block,
+        )
+        if parents:
+            formatted_parents = []
+            for proportion, parent in parents.value:
+                # Convert U64 to int
+                formatted_child = decode_account_id(parent[0])
+                normalized_proportion = u64_normalized_float(proportion)
+                formatted_parents.append((normalized_proportion, formatted_child))
+            return formatted_parents
+
+        return []
+
     async def get_children(
         self,
         hotkey: str,

bittensor/core/subtensor.py

@@ -751,6 +751,38 @@ def get_hyperparameter(
 
         return getattr(result, "value", result)
 
+    def get_parents(
+        self, hotkey: str, netuid: int, block: Optional[int] = None
+    ) -> list[tuple[float, str]]:
+        """
+        This method retrieves the parent of a given hotkey and netuid. It queries the SubtensorModule's ParentKeys
+            storage function to get the children and formats them before returning as a tuple.
+
+        Arguments:
+            hotkey: The child hotkey SS58.
+            netuid: The netuid.
+            block: The block number for which the children are to be retrieved.
+
+        Returns:
+            A list of formatted parents [(proportion, parent)]
+        """
+        parents = self.substrate.query(
+            module="SubtensorModule",
+            storage_function="ParentKeys",
+            params=[hotkey, netuid],
+            block_hash=self.determine_block_hash(block),
+        )
+        if parents:
+            formatted_parents = []
+            for proportion, parent in parents.value:
+                # Convert U64 to int
+                formatted_child = decode_account_id(parent[0])
+                normalized_proportion = u64_normalized_float(proportion)
+                formatted_parents.append((normalized_proportion, formatted_child))
+            return formatted_parents
+
+        return []
+
     def get_children(
         self, hotkey: str, netuid: int, block: Optional[int] = None
     ) -> tuple[bool, list[tuple[float, str]], str]:

bittensor/core/subtensor_api/subnets.py

@@ -14,6 +14,7 @@ def __init__(self, subtensor: Union["_Subtensor", "_AsyncSubtensor"]):
         self.bonds = subtensor.bonds
         self.difficulty = subtensor.difficulty
         self.get_all_subnets_info = subtensor.get_all_subnets_info
+        self.get_parents = subtensor.get_parents
         self.get_children = subtensor.get_children
         self.get_children_pending = subtensor.get_children_pending
         self.get_current_weight_commit_info = subtensor.get_current_weight_commit_info

bittensor/core/subtensor_api/utils.py

@@ -36,6 +36,7 @@ def add_legacy_methods(subtensor: "SubtensorApi"):
     subtensor.get_balance = subtensor._subtensor.get_balance
     subtensor.get_balances = subtensor._subtensor.get_balances
     subtensor.get_block_hash = subtensor._subtensor.get_block_hash
+    subtensor.get_parents = subtensor._subtensor.get_parents
     subtensor.get_children = subtensor._subtensor.get_children
     subtensor.get_children_pending = subtensor._subtensor.get_children_pending
     subtensor.get_commitment = subtensor._subtensor.get_commitment

tests/e2e_tests/test_hotkeys.py

@@ -69,7 +69,7 @@ def test_hotkeys(subtensor, alice_wallet, dave_wallet):
         )
         is True
     )
-    logging.console.success(f"✅ Test [green]test_hotkeys[/green] passed")
+    logging.console.success("✅ Test [green]test_hotkeys[/green] passed")
 
 
 @pytest.mark.asyncio
@@ -276,6 +276,10 @@ async def test_children(local_chain, subtensor, alice_wallet, bob_wallet, dave_w
     assert success is True
     assert children == [(1.0, bob_wallet.hotkey.ss58_address)]
 
+    parent_ = subtensor.get_parents(bob_wallet.hotkey.ss58_address, dave_subnet_netuid)
+
+    assert parent_ == [(1.0, alice_wallet.hotkey.ss58_address)]
+
     # pending queue is empty
     pending, cooldown = subtensor.get_children_pending(
         alice_wallet.hotkey.ss58_address,

tests/unit_tests/test_async_subtensor.py

@@ -1981,6 +1981,90 @@ async def test_get_children_substrate_request_exception(subtensor, mocker):
     assert result == (False, [], "Formatted error message")
 
 
+@pytest.mark.asyncio
+async def test_get_parents_success(subtensor, mocker):
+    """Tests get_parents when parents are successfully retrieved and formatted."""
+    # Preps
+    fake_hotkey = "valid_hotkey"
+    fake_netuid = 1
+    fake_parents = mocker.Mock(
+        value=[
+            (1000, ["parent_key_1"]),
+            (2000, ["parent_key_2"]),
+        ]
+    )
+
+    mocked_query = mocker.AsyncMock(return_value=fake_parents)
+    subtensor.substrate.query = mocked_query
+
+    mocked_decode_account_id = mocker.Mock(
+        side_effect=["decoded_parent_key_1", "decoded_parent_key_2"]
+    )
+    mocker.patch.object(async_subtensor, "decode_account_id", mocked_decode_account_id)
+
+    expected_formatted_parents = [
+        (u64_normalized_float(1000), "decoded_parent_key_1"),
+        (u64_normalized_float(2000), "decoded_parent_key_2"),
+    ]
+
+    # Call
+    result = await subtensor.get_parents(hotkey=fake_hotkey, netuid=fake_netuid)
+
+    # Asserts
+    mocked_query.assert_called_once_with(
+        block_hash=None,
+        module="SubtensorModule",
+        storage_function="ParentKeys",
+        params=[fake_hotkey, fake_netuid],
+        reuse_block_hash=False,
+    )
+    mocked_decode_account_id.assert_has_calls(
+        [mocker.call("parent_key_1"), mocker.call("parent_key_2")]
+    )
+    assert result == expected_formatted_parents
+
+
+@pytest.mark.asyncio
+async def test_get_parents_no_parents(subtensor, mocker):
+    """Tests get_parents when there are no parents to retrieve."""
+    # Preps
+    fake_hotkey = "valid_hotkey"
+    fake_netuid = 1
+    fake_parents = []
+
+    mocked_query = mocker.AsyncMock(return_value=fake_parents)
+    subtensor.substrate.query = mocked_query
+
+    # Call
+    result = await subtensor.get_parents(hotkey=fake_hotkey, netuid=fake_netuid)
+
+    # Asserts
+    mocked_query.assert_called_once_with(
+        block_hash=None,
+        module="SubtensorModule",
+        storage_function="ParentKeys",
+        params=[fake_hotkey, fake_netuid],
+        reuse_block_hash=False,
+    )
+    assert result == []
+
+
+@pytest.mark.asyncio
+async def test_get_parents_substrate_request_exception(subtensor, mocker):
+    """Tests get_parents when SubstrateRequestException is raised."""
+    # Preps
+    fake_hotkey = "valid_hotkey"
+    fake_netuid = 1
+    fake_exception = async_subtensor.SubstrateRequestException("Test Exception")
+
+    mocked_query = mocker.AsyncMock(side_effect=fake_exception)
+    subtensor.substrate.query = mocked_query
+
+    # Call
+    with pytest.raises(async_subtensor.SubstrateRequestException):
+        await subtensor.get_parents(hotkey=fake_hotkey, netuid=fake_netuid)
+
+
 @pytest.mark.asyncio
 async def test_get_children_pending(mock_substrate, subtensor):
     mock_substrate.query.return_value.value = [

tests/unit_tests/test_subtensor.py

@@ -3746,3 +3746,67 @@ def test_get_next_epoch_start_block(mocker, subtensor, call_return, expected):
     )
     subtensor.tempo.assert_called_once_with(netuid=netuid, block=block)
     assert result == expected
+
+
+def test_get_parents_success(subtensor, mocker):
+    """Tests get_parents when parents are successfully retrieved and formatted."""
+    # Preps
+    fake_hotkey = "valid_hotkey"
+    fake_netuid = 1
+    fake_parents = mocker.Mock(
+        value=[
+            (1000, ["parent_key_1"]),
+            (2000, ["parent_key_2"]),
+        ]
+    )
+
+    mocked_query = mocker.MagicMock(return_value=fake_parents)
+    subtensor.substrate.query = mocked_query
+
+    mocked_decode_account_id = mocker.Mock(
+        side_effect=["decoded_parent_key_1", "decoded_parent_key_2"]
+    )
+    mocker.patch.object(subtensor_module, "decode_account_id", mocked_decode_account_id)
+
+    expected_formatted_parents = [
+        (u64_normalized_float(1000), "decoded_parent_key_1"),
+        (u64_normalized_float(2000), "decoded_parent_key_2"),
+    ]
+
+    # Call
+    result = subtensor.get_parents(hotkey=fake_hotkey, netuid=fake_netuid)
+
+    # Asserts
+    mocked_query.assert_called_once_with(
+        block_hash=None,
+        module="SubtensorModule",
+        storage_function="ParentKeys",
+        params=[fake_hotkey, fake_netuid],
+    )
+    mocked_decode_account_id.assert_has_calls(
+        [mocker.call("parent_key_1"), mocker.call("parent_key_2")]
+    )
+    assert result == expected_formatted_parents
+
+
+def test_get_parents_no_parents(subtensor, mocker):
+    """Tests get_parents when there are no parents to retrieve."""
+    # Preps
+    fake_hotkey = "valid_hotkey"
+    fake_netuid = 1
+    fake_parents = []
+
+    mocked_query = mocker.MagicMock(return_value=fake_parents)
+    subtensor.substrate.query = mocked_query
+
+    # Call
+    result = subtensor.get_parents(hotkey=fake_hotkey, netuid=fake_netuid)
+
+    # Asserts
+    mocked_query.assert_called_once_with(
+        block_hash=None,
+        module="SubtensorModule",
+        storage_function="ParentKeys",
+        params=[fake_hotkey, fake_netuid],
+    )
+    assert result == []