68 lines
1.9 KiB
Python
68 lines
1.9 KiB
Python
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import rlp
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from rlp.sedes import CountableList, binary
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from web3.auto import w3
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from child_chain.exceptions import (CoinAlreadyIncludedException,
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InvalidBlockSignatureException)
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from utils.merkle.sparse_merkle_tree import SparseMerkleTree
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from utils.utils import get_sender, sign
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from .transaction import Transaction
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class Block(rlp.Serializable):
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fields = [('transaction_set', CountableList(Transaction)), ('sig', binary)]
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def __init__(self, transaction_set=None, sig=b'\x00' * 65):
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if transaction_set is None:
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self.transactions = {}
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else:
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self.transactions = {tx.uid: tx for tx in transaction_set}
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self.merkle = None
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self.sig = sig
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@property
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def hash(self):
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return w3.sha3(rlp.encode(self, UnsignedBlock))
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@property
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def merkle_hash(self):
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return w3.sha3(rlp.encode(self))
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@property
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def transaction_set(self):
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return list(self.transactions.values())
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@property
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def sender(self):
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if self.sig == b'\x00' * 65:
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raise InvalidBlockSignatureException('Block not signed')
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return get_sender(self.hash, self.sig)
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def merklize_transaction_set(self):
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hashed_transaction_dict = {
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tx.uid: tx.hash for tx in self.transactions.values()
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}
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self.merkle = SparseMerkleTree(64, hashed_transaction_dict)
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return self.merkle.root
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def add_tx(self, tx):
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if tx.uid in self.transactions:
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raise CoinAlreadyIncludedException('double spend rejected')
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else:
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self.transactions[tx.uid] = tx
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# `uid` is the coin that was transferred
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def get_tx_by_uid(self, uid):
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if uid in self.transactions:
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return self.transactions[uid]
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else:
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return Transaction(0, 0, 0, 0)
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def sign(self, key):
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self.sig = sign(self.hash, key)
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UnsignedBlock = Block.exclude(['sig'])
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