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
#[cfg(not(feature = "std"))]
extern crate alloc;
#[cfg(not(feature = "std"))]
use alloc::{string::String, string::ToString, vec::Vec};
use hex::FromHexError;
use sp_core::storage::StorageKey;
use sp_core::twox_128;
use sp_core::H256 as Hash;
pub fn storage_key(module: &str, storage_key_name: &str) -> StorageKey {
let mut key = twox_128(module.as_bytes()).to_vec();
key.extend(&twox_128(storage_key_name.as_bytes()));
StorageKey(key)
}
pub trait FromHexString {
fn from_hex(hex: String) -> Result<Self, hex::FromHexError>
where
Self: Sized;
}
impl FromHexString for Vec<u8> {
fn from_hex(hex: String) -> Result<Self, hex::FromHexError> {
let hexstr = hex
.trim_matches('\"')
.to_string()
.trim_start_matches("0x")
.to_string();
hex::decode(&hexstr)
}
}
impl FromHexString for Hash {
fn from_hex(hex: String) -> Result<Self, FromHexError> {
let vec = Vec::from_hex(hex)?;
match vec.len() {
32 => Ok(Hash::from_slice(&vec)),
_ => Err(hex::FromHexError::InvalidStringLength),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_hextstr_to_vec() {
assert_eq!(Vec::from_hex("0x01020a".to_string()), Ok(vec!(1, 2, 10)));
assert_eq!(
Vec::from_hex("null".to_string()),
Err(hex::FromHexError::InvalidHexCharacter { c: 'n', index: 0 })
);
assert_eq!(
Vec::from_hex("0x0q".to_string()),
Err(hex::FromHexError::InvalidHexCharacter { c: 'q', index: 1 })
);
}
#[test]
fn test_hextstr_to_hash() {
assert_eq!(
Hash::from_hex(
"0x0000000000000000000000000000000000000000000000000000000000000000".to_string()
),
Ok(Hash::from([0u8; 32]))
);
assert_eq!(
Hash::from_hex("0x010000000000000000".to_string()),
Err(hex::FromHexError::InvalidStringLength)
);
assert_eq!(
Hash::from_hex("0x0q".to_string()),
Err(hex::FromHexError::InvalidHexCharacter { c: 'q', index: 1 })
);
}
}