mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-08 10:08:02 +00:00
Bastian Köcher
2b282a9435
All of them are a subset of `DispatchError` anyway, no need to have special errors IMHO.
59 lines
2.1 KiB
Rust
59 lines
2.1 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2017-2021 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Assets pallet's `StoredMap` implementation.
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use super::*;
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impl<T: Config<I>, I: 'static> StoredMap<(T::AssetId, T::AccountId), T::Extra> for Pallet<T, I> {
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fn get(id_who: &(T::AssetId, T::AccountId)) -> T::Extra {
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let &(id, ref who) = id_who;
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if Account::<T, I>::contains_key(id, who) {
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Account::<T, I>::get(id, who).extra
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} else {
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Default::default()
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}
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}
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fn try_mutate_exists<R, E: From<DispatchError>>(
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id_who: &(T::AssetId, T::AccountId),
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f: impl FnOnce(&mut Option<T::Extra>) -> Result<R, E>,
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) -> Result<R, E> {
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let &(id, ref who) = id_who;
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let mut maybe_extra = Some(Account::<T, I>::get(id, who).extra);
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let r = f(&mut maybe_extra)?;
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// They want to write some value or delete it.
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// If the account existed and they want to write a value, then we write.
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// If the account didn't exist and they want to delete it, then we let it pass.
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// Otherwise, we fail.
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Account::<T, I>::try_mutate_exists(id, who, |maybe_account| {
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if let Some(extra) = maybe_extra {
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// They want to write a value. Let this happen only if the account actually exists.
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if let Some(ref mut account) = maybe_account {
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account.extra = extra;
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} else {
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Err(DispatchError::NoProviders)?;
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}
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} else {
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// They want to delete it. Let this pass if the item never existed anyway.
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ensure!(maybe_account.is_none(), DispatchError::ConsumerRemaining);
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}
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Ok(r)
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})
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}
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}
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