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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

use rlp::{self, Encodable, Decodable, RlpStream, DecoderError, UntrustedRlp};
use bigint::{Address, Gas, H256, U256, B256, H64, H2048};
use blockchain::Block as BlockchainBlock;
use trie::MemoryTrie;
use bloom::LogsBloom;
use sha3::{Keccak256, Digest};
use std::collections::HashMap;
use super::{Header, Transaction, Receipt};

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Block {
    pub header: Header,
    pub transactions: Vec<Transaction>,
    pub ommers: Vec<Header>,
}

impl BlockchainBlock for Block {
    type Transaction = Transaction;
    type Extra = Receipt;
    type Hash = H256;

    fn next(
        &self,
        transactions: &[Transaction],
        receipts: &[Receipt],
        new_world_state_hash: H256
    ) -> Self {
        let parent_hash = H256::from(Keccak256::digest(&rlp::encode(self).to_vec()).as_slice());
        let ommers_hash = MemoryTrie::empty(HashMap::new()).root();
        let beneficiary = Address::default();
        let state_root = new_world_state_hash;
        let number = self.header.number + U256::one();
        let mut transaction_trie = MemoryTrie::empty(HashMap::new());
        let mut receipt_trie = MemoryTrie::empty(HashMap::new());
        let mut logs_bloom = LogsBloom::new();
        debug_assert!(transactions.len() == receipts.len());

        for i in 0..transactions.len() {
            transaction_trie.insert(rlp::encode(&i).to_vec(),
                                    rlp::encode(&transactions[i]).to_vec());
            receipt_trie.insert(rlp::encode(&i).to_vec(),
                                rlp::encode(&receipts[i]).to_vec());
            logs_bloom = logs_bloom | receipts[i].logs_bloom.clone();
        }

        let header = Header {
            parent_hash,
            ommers_hash,
            beneficiary,
            state_root,
            number,

            transactions_root: transaction_trie.root(),
            receipts_root: receipt_trie.root(),
            logs_bloom: logs_bloom,

            difficulty: U256::zero(),
            gas_limit: Gas::zero(),
            gas_used: Gas::zero(),
            timestamp: 0,
            extra_data: B256::default(),
            mix_hash: H256::default(),
            nonce: H64::default(),
        };

        Block {
            header,
            transactions: transactions.into(),
            ommers: Vec::new(),
        }
    }

    fn is_next(
        &self,
        other: &Self,
        transactions: &[Transaction],
        receipts: &[Receipt],
        new_world_state_hash: H256
    ) -> bool {
        let parent_hash = H256::from(Keccak256::digest(&rlp::encode(self).to_vec()).as_slice());
        let state_root = new_world_state_hash;
        let number = self.header.number + U256::one();
        let mut transaction_trie = MemoryTrie::empty(HashMap::new());
        let mut receipt_trie = MemoryTrie::empty(HashMap::new());
        let mut logs_bloom = LogsBloom::new();
        debug_assert!(transactions.len() == receipts.len());

        for i in 0..transactions.len() {
            transaction_trie.insert(rlp::encode(&i).to_vec(),
                                    rlp::encode(&transactions[i]).to_vec());
            receipt_trie.insert(rlp::encode(&i).to_vec(),
                                rlp::encode(&receipts[i]).to_vec());
            logs_bloom = logs_bloom | receipts[i].logs_bloom.clone();
        }

        true &&
            other.header.parent_hash == parent_hash &&
            other.header.state_root == state_root &&
            other.header.number == number &&
            other.header.transactions_root == transaction_trie.root() &&
            other.header.receipts_root == receipt_trie.root() &&
            other.header.logs_bloom == logs_bloom
    }
}

impl Encodable for Block {
    fn rlp_append(&self, s: &mut RlpStream) {
        s.begin_list(3);
        s.append(&self.header);
        s.append_list(&self.transactions);
        s.append_list(&self.ommers);
    }
}

impl Decodable for Block {
    fn decode(rlp: &UntrustedRlp) -> Result<Self, DecoderError> {
        Ok(Self {
            header: rlp.val_at(0)?,
            transactions: rlp.list_at(1)?,
            ommers: rlp.list_at(2)?,
        })
    }
}

#[cfg(test)]
mod tests {
    use rlp::{encode, decode, Rlp};
    use hexutil::read_hex;
    use bigint::{U256, H256, Address, Gas};
    use bloom::LogsBloom;
    use block::Block;
    use transaction::TransactionAction;
    use std::str::FromStr;

    #[test]
    fn block_53165_rlp() {
        let raw = read_hex("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").unwrap();
        let block: Block = decode(&raw);
        assert_eq!(block.header.parent_hash, H256::from_str("37ecbfd908ece3c54fa5b9f8e1b4a6089139da1dc4b5013a46c5818304de47b3").unwrap());
        assert_eq!(block.transactions[0].action, TransactionAction::Call(Address::from_str("0xdc884e349103eaee4aef913d532cb5db2745f48b").unwrap()));
        assert_eq!(block.transactions[0].gas_limit, Gas::from(500000u64));
        assert_eq!(block.transactions[0].value, U256::zero());
        assert_eq!(block.ommers[0].parent_hash, H256::from_str("59c53a8471fdc848352699052890b6156753a94743cfb4dc3f921df67e16978a").unwrap());
        assert_eq!(block.ommers[0].beneficiary, Address::from_str("f2d2aff1320476cb8c6b607199d23175cc595693").unwrap());
        assert_eq!(block, decode(&encode(&block).to_vec()));

        let encoded = encode(&block).to_vec();
        assert_eq!(encoded, raw);
    }
}