ethjson/
hash.rs

1// Copyright 2015-2020 Parity Technologies (UK) Ltd.
2// This file is part of Parity Ethereum.
3
4// Parity Ethereum is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8
9// Parity Ethereum is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License
15// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.
16
17//! Lenient hash json deserialization for test json files.
18
19use std::str::FromStr;
20use std::fmt;
21use serde::{Deserialize, Deserializer, Serialize, Serializer};
22use serde::de::{Error, Visitor};
23use ethereum_types::{H64 as Hash64, H160 as Hash160, H256 as Hash256, H520 as Hash520, Bloom as Hash2048};
24
25macro_rules! impl_hash {
26	($name: ident, $inner: ident) => {
27		/// Lenient hash json deserialization for test json files.
28		#[derive(Default, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Clone)]
29		pub struct $name(pub $inner);
30
31		impl From<$name> for $inner {
32			fn from(other: $name) -> $inner {
33				other.0
34			}
35		}
36
37		impl From<$inner> for $name {
38			fn from(i: $inner) -> Self {
39				$name(i)
40			}
41		}
42
43		impl<'a> Deserialize<'a> for $name {
44			fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
45				where D: Deserializer<'a> {
46
47				struct HashVisitor;
48
49				impl<'b> Visitor<'b> for HashVisitor {
50					type Value = $name;
51
52					fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
53						write!(formatter, "a 0x-prefixed hex-encoded hash")
54					}
55
56					fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: Error {
57						let value = match value.len() {
58							0 => $inner::from_low_u64_be(0),
59							2 if value == "0x" => $inner::from_low_u64_be(0),
60							_ if value.starts_with("0x") => $inner::from_str(&value[2..]).map_err(|e| {
61								Error::custom(format!("Invalid hex value {}: {}", value, e).as_str())
62							})?,
63							_ => $inner::from_str(value).map_err(|e| {
64								Error::custom(format!("Invalid hex value {}: {}", value, e).as_str())
65							})?,
66						};
67
68						Ok($name(value))
69					}
70
71					fn visit_string<E>(self, value: String) -> Result<Self::Value, E> where E: Error {
72						self.visit_str(value.as_ref())
73					}
74				}
75
76				deserializer.deserialize_any(HashVisitor)
77			}
78		}
79
80		impl Serialize for $name {
81			fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
82				serializer.serialize_str(&format!("{:#x}", self.0))
83			}
84		}
85	}
86}
87
88
89impl_hash!(H64, Hash64);
90impl_hash!(Address, Hash160);
91impl_hash!(H256, Hash256);
92impl_hash!(H520, Hash520);
93impl_hash!(Bloom, Hash2048);
94
95#[cfg(test)]
96mod test {
97	use super::H256;
98	use std::str::FromStr;
99
100	#[test]
101	fn hash_deserialization() {
102		let s = r#"["", "5a39ed1020c04d4d84539975b893a4e7c53eab6c2965db8bc3468093a31bc5ae"]"#;
103		let deserialized: Vec<H256> = serde_json::from_str(s).unwrap();
104		assert_eq!(deserialized, vec![
105				   H256(ethereum_types::H256::zero()),
106				   H256(ethereum_types::H256::from_str("5a39ed1020c04d4d84539975b893a4e7c53eab6c2965db8bc3468093a31bc5ae").unwrap())
107		]);
108	}
109
110	#[test]
111	fn hash_into() {
112		assert_eq!(ethereum_types::H256::zero(), H256(ethereum_types::H256::zero()).into());
113	}
114}
ethjson/hash.rs

ethjson/
hash.rs
