1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84

// This file is part of Substrate.

// Copyright (C) 2019-2022 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.

//! Traits for creating and destroying assets.

use sp_runtime::{DispatchError, DispatchResult};

use super::Inspect;

/// Trait for providing the ability to create new fungible assets.
pub trait Create<AccountId>: Inspect<AccountId> {
	/// Create a new fungible asset.
	fn create(
		id: Self::AssetId,
		admin: AccountId,
		is_sufficient: bool,
		min_balance: Self::Balance,
	) -> DispatchResult;
}

/// Trait for providing the ability to destroy existing fungible assets.
pub trait Destroy<AccountId>: Inspect<AccountId> {
	/// Start the destruction an existing fungible asset.
	/// * `id`: The `AssetId` to be destroyed. successfully.
	/// * `maybe_check_owner`: An optional account id that can be used to authorize the destroy
	///   command. If not provided, no authorization checks will be performed before destroying
	///   asset.
	fn start_destroy(id: Self::AssetId, maybe_check_owner: Option<AccountId>) -> DispatchResult;

	/// Destroy all accounts associated with a given asset.
	/// `destroy_accounts` should only be called after `start_destroy` has been called, and the
	/// asset is in a `Destroying` state
	///
	/// * `id`: The identifier of the asset to be destroyed. This must identify an existing asset.
	/// * `max_items`: The maximum number of accounts to be destroyed for a given call of the
	///   function. This value should be small enough to allow the operation fit into a logical
	///   block.
	///
	///	Response:
	/// * u32: Total number of approvals which were actually destroyed
	///
	/// Due to weight restrictions, this function may need to be called multiple
	/// times to fully destroy all approvals. It will destroy `max_items` approvals at a
	/// time.
	fn destroy_accounts(id: Self::AssetId, max_items: u32) -> Result<u32, DispatchError>;
	/// Destroy all approvals associated with a given asset up to the `max_items`
	/// `destroy_approvals` should only be called after `start_destroy` has been called, and the
	/// asset is in a `Destroying` state
	///
	/// * `id`: The identifier of the asset to be destroyed. This must identify an existing asset.
	/// * `max_items`: The maximum number of accounts to be destroyed for a given call of the
	///   function. This value should be small enough to allow the operation fit into a logical
	///   block.
	///
	///	Response:
	/// * u32: Total number of approvals which were actually destroyed
	///
	/// Due to weight restrictions, this function may need to be called multiple
	/// times to fully destroy all approvals. It will destroy `max_items` approvals at a
	/// time.
	fn destroy_approvals(id: Self::AssetId, max_items: u32) -> Result<u32, DispatchError>;

	/// Complete destroying asset and unreserve currency.
	/// `finish_destroy` should only be called after `start_destroy` has been called, and the
	/// asset is in a `Destroying` state. All accounts or approvals should be destroyed before
	/// hand.
	///
	/// * `id`: The identifier of the asset to be destroyed. This must identify an existing asset.
	fn finish_destroy(id: Self::AssetId) -> DispatchResult;
}