exonum 0.6.0

An extensible framework for blockchain software projects.
Documentation 
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// Copyright 2017 The Exonum Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crypto::Hash;
use messages::Precommit;
use helpers::{Height, ValidatorId};

/// Current core information schema version.
pub const SCHEMA_MAJOR_VERSION: u16 = 0;

encoding_struct!(
    /// Exonum block header data structure.
    ///
    /// Block is essentially a list of transactions, which is
    /// a result of the consensus algorithm (thus authenticated by the supermajority of validators)
    /// and is applied atomically to the blockchain state.
    ///
    /// Header only contains the amount of transactions and the transactions root hash as well as
    /// other information, but not the transactions themselves.
    struct Block {
        /// Information schema version.
        schema_version: u16,
        /// Block proposer id.
        proposer_id: ValidatorId,
        /// Height of the committed block
        height: Height,
        /// Number of transactions in block.
        tx_count: u32,
        /// Hash link to the previous block in blockchain.
        prev_hash: &Hash,
        /// Root hash of [merkle tree](struct.Schema.html#method.block_txs) of current block
        /// transactions.
        tx_hash: &Hash,
        /// Hash of the current `exonum` state after applying transactions in the block.
        state_hash: &Hash,
    }
);

/// Block with pre-commits.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct BlockProof {
    /// Block.
    pub block: Block,
    /// List of pre-commits for the block.
    pub precommits: Vec<Precommit>,
}

#[cfg(test)]
mod tests {
    use crypto::hash;
    use super::*;

    #[test]
    fn test_block() {
        let proposer_id = ValidatorId(1024);
        let txs = [4, 5, 6];
        let height = Height(123_345);
        let prev_hash = hash(&[1, 2, 3]);
        let tx_hash = hash(&txs);
        let tx_count = txs.len() as u32;
        let state_hash = hash(&[7, 8, 9]);
        let block = Block::new(
            SCHEMA_MAJOR_VERSION,
            proposer_id,
            height,
            tx_count,
            &prev_hash,
            &tx_hash,
            &state_hash,
        );

        assert_eq!(block.schema_version(), SCHEMA_MAJOR_VERSION);
        assert_eq!(block.proposer_id(), proposer_id);
        assert_eq!(block.height(), height);
        assert_eq!(block.tx_count(), tx_count);
        assert_eq!(block.prev_hash(), &prev_hash);
        assert_eq!(block.tx_hash(), &tx_hash);
        assert_eq!(block.state_hash(), &state_hash);
        let json_str = ::serde_json::to_string(&block).unwrap();
        let block1: Block = ::serde_json::from_str(&json_str).unwrap();
        assert_eq!(block1, block);
    }
}