tendermint 0.10.1

Tendermint is a high-performance blockchain consensus engine that powers Byzantine fault tolerant applications written in any programming language. This crate provides core types for representing information about Tendermint blockchain networks, including chain information types, secret connections, and remote procedure calls (JSONRPC).
Documentation 
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

//! Transaction hashes

use crate::error::{Error, ErrorKind};
#[cfg(feature = "serde")]
use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
use std::{
    fmt::{self, Debug, Display},
    str::FromStr,
};
use subtle::{self, ConstantTimeEq};
use subtle_encoding::hex;

/// Size of a transaction hash in bytes
pub const LENGTH: usize = 20;

/// Trannsaction hashes
#[derive(Copy, Clone, Hash)]
pub struct Hash([u8; LENGTH]);

impl Hash {
    /// Create a new transaction hash from raw bytes
    pub fn new(bytes: [u8; LENGTH]) -> Hash {
        Hash(bytes)
    }

    /// Borrow the transaction hash as a byte slice
    pub fn as_bytes(&self) -> &[u8] {
        &self.0[..]
    }
}

impl AsRef<[u8]> for Hash {
    fn as_ref(&self) -> &[u8] {
        self.as_bytes()
    }
}

impl ConstantTimeEq for Hash {
    #[inline]
    fn ct_eq(&self, other: &Hash) -> subtle::Choice {
        self.as_bytes().ct_eq(other.as_bytes())
    }
}

impl Display for Hash {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        for byte in &self.0 {
            write!(f, "{:02X}", byte)?;
        }
        Ok(())
    }
}

impl Debug for Hash {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "transactionn::Hash({})", self)
    }
}

/// Decode transaction hash from hex
impl FromStr for Hash {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        // Accept either upper or lower case hex
        let bytes = hex::decode_upper(s)
            .or_else(|_| hex::decode(s))
            .map_err(|_| ErrorKind::Parse)?;

        if bytes.len() != LENGTH {
            Err(ErrorKind::Parse)?;
        }

        let mut result_bytes = [0u8; LENGTH];
        result_bytes.copy_from_slice(&bytes);
        Ok(Hash(result_bytes))
    }
}

#[cfg(feature = "serde")]
impl<'de> Deserialize<'de> for Hash {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        let s = String::deserialize(deserializer)?;
        Self::from_str(&s).map_err(|_| {
            de::Error::custom(format!(
                "expected {}-character hex string, got {:?}",
                LENGTH * 2,
                s
            ))
        })
    }
}

#[cfg(feature = "serde")]
impl Serialize for Hash {
    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
        self.to_string().serialize(serializer)
    }
}