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
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

// This file is part of Substrate.

// Copyright (C) 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.

//! Operation on runtime storage using hashed keys.

use super::unhashed;
use codec::{Decode, Encode};
use sp_std::prelude::*;

/// Return the value of the item in storage under `key`, or `None` if there is no explicit entry.
pub fn get<T, HashFn, R>(hash: &HashFn, key: &[u8]) -> Option<T>
where
	T: Decode + Sized,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::get(hash(key).as_ref())
}

/// Return the value of the item in storage under `key`, or the type's default if there is no
/// explicit entry.
pub fn get_or_default<T, HashFn, R>(hash: &HashFn, key: &[u8]) -> T
where
	T: Decode + Sized + Default,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::get_or_default(hash(key).as_ref())
}

/// Return the value of the item in storage under `key`, or `default_value` if there is no
/// explicit entry.
pub fn get_or<T, HashFn, R>(hash: &HashFn, key: &[u8], default_value: T) -> T
where
	T: Decode + Sized,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::get_or(hash(key).as_ref(), default_value)
}

/// Return the value of the item in storage under `key`, or `default_value()` if there is no
/// explicit entry.
pub fn get_or_else<T, F, HashFn, R>(hash: &HashFn, key: &[u8], default_value: F) -> T
where
	T: Decode + Sized,
	F: FnOnce() -> T,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::get_or_else(hash(key).as_ref(), default_value)
}

/// Put `value` in storage under `key`.
pub fn put<T, HashFn, R>(hash: &HashFn, key: &[u8], value: &T)
where
	T: Encode,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::put(hash(key).as_ref(), value)
}

/// Remove `key` from storage, returning its value if it had an explicit entry or `None` otherwise.
pub fn take<T, HashFn, R>(hash: &HashFn, key: &[u8]) -> Option<T>
where
	T: Decode + Sized,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::take(hash(key).as_ref())
}

/// Remove `key` from storage, returning its value, or, if there was no explicit entry in storage,
/// the default for its type.
pub fn take_or_default<T, HashFn, R>(hash: &HashFn, key: &[u8]) -> T
where
	T: Decode + Sized + Default,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::take_or_default(hash(key).as_ref())
}

/// Return the value of the item in storage under `key`, or `default_value` if there is no
/// explicit entry. Ensure there is no explicit entry on return.
pub fn take_or<T, HashFn, R>(hash: &HashFn, key: &[u8], default_value: T) -> T
where
	T: Decode + Sized,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::take_or(hash(key).as_ref(), default_value)
}

/// Return the value of the item in storage under `key`, or `default_value()` if there is no
/// explicit entry. Ensure there is no explicit entry on return.
pub fn take_or_else<T, F, HashFn, R>(hash: &HashFn, key: &[u8], default_value: F) -> T
where
	T: Decode + Sized,
	F: FnOnce() -> T,
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::take_or_else(hash(key).as_ref(), default_value)
}

/// Check to see if `key` has an explicit entry in storage.
pub fn exists<HashFn, R>(hash: &HashFn, key: &[u8]) -> bool
where
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::exists(hash(key).as_ref())
}

/// Ensure `key` has no explicit entry in storage.
pub fn kill<HashFn, R>(hash: &HashFn, key: &[u8])
where
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::kill(hash(key).as_ref())
}

/// Get a Vec of bytes from storage.
pub fn get_raw<HashFn, R>(hash: &HashFn, key: &[u8]) -> Option<Vec<u8>>
where
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::get_raw(hash(key).as_ref())
}

/// Put a raw byte slice into storage.
pub fn put_raw<HashFn, R>(hash: &HashFn, key: &[u8], value: &[u8])
where
	HashFn: Fn(&[u8]) -> R,
	R: AsRef<[u8]>,
{
	unhashed::put_raw(hash(key).as_ref(), value)
}