Implement fungible::* for Balances (#8454)

* Reservable, Transferrable Fungible(s), plus adapters. * Repot into new dir * Imbalances for Fungibles * Repot and balanced fungible. * Clean up names and bridge-over Imbalanced. * Repot frame_support::trait. Finally. * Make build. * Docs * Good errors * Fix tests. Implement fungible::Inspect for Balances. * Implement additional traits for Balances. * Revert UI test "fixes" * Fix UI error * Fix UI test * More work on fungibles * Fixes * More work. * Update lock * Make fungible::reserved work for Balances * Introduce Freezer to Assets, ready for a reserve & locks pallet. Some renaming/refactoring. * Cleanup errors * Imbalances working with Assets * Test for freezer. * Grumbles * Grumbles * Fixes * Extra "side-car" data for a user's asset balance. * Fix * Fix test * Fixes * Line lengths * Comments * Update frame/assets/src/tests.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Update frame/support/src/traits/tokens/fungibles.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Update frame/assets/src/lib.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Update frame/support/src/traits/tokens/fungible.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Introduce `transfer_reserved` * Rename fungible Reserve -> Hold, add flag structs * Avoid the `melted` API - its too complex and gives little help * Repot Assets pallet Co-authored-by: Bastian Köcher <info@kchr.de> Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
2026-04-29 07:58:00 +00:00 · 2021-03-28 20:59:34 +02:00
parent c2dd5e21a4
commit d0eee4f1cb
17 changed files with 1537 additions and 554 deletions
@@ -0,0 +1,58 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2017-2021 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Assets pallet's `StoredMap` implementation.
+
+use super::*;
+
+impl<T: Config> StoredMap<(T::AssetId, T::AccountId), T::Extra> for Pallet<T> {
+	fn get(id_who: &(T::AssetId, T::AccountId)) -> T::Extra {
+		let &(id, ref who) = id_who;
+		if Account::<T>::contains_key(id, who) {
+			Account::<T>::get(id, who).extra
+		} else {
+			Default::default()
+		}
+	}
+
+	fn try_mutate_exists<R, E: From<StoredMapError>>(
+		id_who: &(T::AssetId, T::AccountId),
+		f: impl FnOnce(&mut Option<T::Extra>) -> Result<R, E>,
+	) -> Result<R, E> {
+		let &(id, ref who) = id_who;
+		let mut maybe_extra = Some(Account::<T>::get(id, who).extra);
+		let r = f(&mut maybe_extra)?;
+		// They want to write some value or delete it.
+		// If the account existed and they want to write a value, then we write.
+		// If the account didn't exist and they want to delete it, then we let it pass.
+		// Otherwise, we fail.
+		Account::<T>::try_mutate_exists(id, who, |maybe_account| {
+			if let Some(extra) = maybe_extra {
+				// They want to write a value. Let this happen only if the account actually exists.
+				if let Some(ref mut account) = maybe_account {
+					account.extra = extra;
+				} else {
+					Err(StoredMapError::NoProviders)?;
+				}
+			} else {
+				// They want to delete it. Let this pass if the item never existed anyway.
+				ensure!(maybe_account.is_none(), StoredMapError::ConsumerRemaining);
+			}
+			Ok(r)
+		})
+	}
+}