tendermint 0.28.0

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 (JSON-RPC).
Documentation 
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use core::convert::{TryFrom, TryInto};

use serde::{Deserialize, Serialize};
use tendermint_proto::{types::CanonicalVote as RawCanonicalVote, Protobuf};

use crate::{block, chain::Id as ChainId, error::Error, prelude::*, Time};

/// CanonicalVote is used for protobuf encoding a Vote
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq)]
#[serde(try_from = "RawCanonicalVote", into = "RawCanonicalVote")]
pub struct CanonicalVote {
    /// Type of vote (prevote or precommit)
    pub vote_type: super::Type,

    /// Block height
    pub height: block::Height,

    /// Round
    pub round: block::Round,

    /// Block ID
    //#[serde(deserialize_with = "serializers::parse_non_empty_block_id")] - moved to try_from
    pub block_id: Option<block::Id>,

    /// Timestamp
    pub timestamp: Option<Time>,

    /// Chain ID
    pub chain_id: ChainId,
}

impl Protobuf<RawCanonicalVote> for CanonicalVote {}

impl TryFrom<RawCanonicalVote> for CanonicalVote {
    type Error = Error;

    fn try_from(value: RawCanonicalVote) -> Result<Self, Self::Error> {
        if value.timestamp.is_none() {
            return Err(Error::missing_timestamp());
        }
        let _val: i32 = value.round.try_into().map_err(Error::integer_overflow)?;

        // If the Hash is empty in BlockId, the BlockId should be empty.
        // See: https://github.com/informalsystems/tendermint-rs/issues/663
        let block_id = value.block_id.filter(|i| !i.hash.is_empty());
        Ok(CanonicalVote {
            vote_type: value.r#type.try_into()?,
            height: value.height.try_into()?,
            round: (value.round as i32).try_into()?,
            block_id: block_id.map(|b| b.try_into()).transpose()?,
            timestamp: value.timestamp.map(|t| t.try_into()).transpose()?,
            chain_id: ChainId::try_from(value.chain_id)?,
        })
    }
}

impl From<CanonicalVote> for RawCanonicalVote {
    fn from(value: CanonicalVote) -> Self {
        // If the Hash is empty in BlockId, the BlockId should be empty.
        // See: https://github.com/informalsystems/tendermint-rs/issues/663
        let block_id = value.block_id.filter(|i| i != &block::Id::default());
        RawCanonicalVote {
            r#type: value.vote_type.into(),
            height: value.height.into(),
            round: value.round.value().into(),
            block_id: block_id.map(Into::into),
            timestamp: value.timestamp.map(Into::into),
            chain_id: value.chain_id.to_string(),
        }
    }
}

impl CanonicalVote {
    /// Create CanonicalVote from Vote
    pub fn new(vote: super::Vote, chain_id: ChainId) -> CanonicalVote {
        CanonicalVote {
            vote_type: vote.vote_type,
            height: vote.height,
            round: vote.round,
            block_id: vote.block_id,
            timestamp: vote.timestamp,
            chain_id,
        }
    }
}

#[cfg(test)]
mod tests {
    use core::convert::TryFrom;

    use tendermint_proto::{
        google::protobuf::Timestamp,
        types::{
            CanonicalBlockId as RawCanonicalBlockId,
            CanonicalPartSetHeader as RawCanonicalPartSetHeader, CanonicalVote as RawCanonicalVote,
        },
    };

    use crate::{
        prelude::*,
        vote::{canonical_vote::CanonicalVote, Type},
    };

    #[test]
    fn canonical_vote_domain_checks() {
        // RawCanonicalVote with edge cases to test domain knowledge
        // block_id with empty hash should decode to None
        // timestamp at EPOCH is still considered valid time
        let proto_cp = RawCanonicalVote {
            r#type: 1,
            height: 2,
            round: 4,
            block_id: Some(RawCanonicalBlockId {
                hash: vec![],
                part_set_header: Some(RawCanonicalPartSetHeader {
                    total: 1,
                    hash: vec![1],
                }),
            }),
            timestamp: Some(Timestamp {
                seconds: 0,
                nanos: 0,
            }),
            chain_id: "testchain".to_string(),
        };
        let cp = CanonicalVote::try_from(proto_cp).unwrap();
        assert_eq!(cp.vote_type, Type::Prevote);
        assert!(cp.block_id.is_none());
        assert!(cp.timestamp.is_some());

        // No timestamp is not acceptable
        // See: https://github.com/informalsystems/tendermint-rs/issues/649
        let mut proto_cp: RawCanonicalVote = cp.into();
        proto_cp.timestamp = None;
        assert!(CanonicalVote::try_from(proto_cp).is_err());
    }
}