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

//! Evidence of malfeasance by validators (i.e. signing conflicting votes).

use std::slice;
use {
    crate::{block::signed_header::SignedHeader, serializers, Vote},
    serde::{Deserialize, Serialize},
};

/// Evidence of malfeasance by validators (i.e. signing conflicting votes).
/// encoded using an Amino prefix. There is currently only a single type of
/// evidence: `DuplicateVoteEvidence`.
///
/// <https://github.com/tendermint/spec/blob/d46cd7f573a2c6a2399fcab2cde981330aa63f37/spec/core/data_structures.md#evidence>
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
#[serde(tag = "type", content = "value")]
pub enum Evidence {
    /// Duplicate vote evidence
    #[serde(rename = "tendermint/DuplicateVoteEvidence")]
    DuplicateVote(DuplicateVoteEvidence),

    /// Conflicting headers evidence
    #[serde(rename = "tendermint/ConflictingHeadersEvidence")]
    ConflictingHeaders(Box<ConflictingHeadersEvidence>),
}

/// Duplicate vote evidence
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct DuplicateVoteEvidence {
    vote_a: Vote,
    vote_b: Vote,
}

/// Conflicting headers evidence.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ConflictingHeadersEvidence {
    #[serde(rename = "H1")]
    h1: SignedHeader,
    #[serde(rename = "H2")]
    h2: SignedHeader,
}

impl ConflictingHeadersEvidence {
    /// Create a new evidence of conflicting headers
    pub fn new(h1: SignedHeader, h2: SignedHeader) -> Self {
        Self { h1, h2 }
    }
}

/// Evidence data is a wrapper for a list of `Evidence`.
///
/// <https://github.com/tendermint/spec/blob/d46cd7f573a2c6a2399fcab2cde981330aa63f37/spec/core/data_structures.md#evidencedata>
#[derive(Deserialize, Serialize, Clone, Debug, Default, PartialEq)]
pub struct Data {
    evidence: Option<Vec<Evidence>>,
}

impl Data {
    /// Create a new evidence data collection
    pub fn new<I>(into_evidence: I) -> Data
    where
        I: Into<Vec<Evidence>>,
    {
        Data {
            evidence: Some(into_evidence.into()),
        }
    }

    /// Convert this evidence data into a vector
    pub fn into_vec(self) -> Vec<Evidence> {
        self.iter().cloned().collect()
    }

    /// Iterate over the evidence data
    pub fn iter(&self) -> slice::Iter<'_, Evidence> {
        self.as_ref().iter()
    }
}

impl AsRef<[Evidence]> for Data {
    fn as_ref(&self) -> &[Evidence] {
        self.evidence.as_deref().unwrap_or_else(|| &[])
    }
}

/// Evidence collection parameters
#[derive(Deserialize, Serialize, Clone, Debug, Eq, PartialEq)]
pub struct Params {
    /// Maximum allowed age for evidence to be collected
    #[serde(with = "serializers::from_str")]
    pub max_age_num_blocks: u64,

    /// Max age duration
    pub max_age_duration: Duration,
}

/// Duration is a wrapper around std::time::Duration
/// essentially, to keep the usages look cleaner
/// i.e. you can avoid using serde annotations everywhere
#[derive(Copy, Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
pub struct Duration(#[serde(with = "serializers::time_duration")] pub std::time::Duration);

impl From<Duration> for std::time::Duration {
    fn from(d: Duration) -> std::time::Duration {
        d.0
    }
}