def mine(self):
""" Looks in redis for transactions and mines them to find the answer to the puzzle
"""
print("Mining")
prev_hash = self.r.get(PREV_HASH_KEY)
if prev_hash:
prev_hash = prev_hash.decode('utf-8')
block = Block(prev_hash)
# wait to fill the block with transactions
while not block.full():
# in between mining
if self.stop_mining():
print("Someone mined the coins")
l = len(block.transactions)
left = TRANSACTIONS_IN_BLOCK - l
for _ in range(left):
self.r.blpop(TRANSACTION_QUEUE_KEY)
return None
print("Searching for transactions to fill the block")
# blocking pop from transaction key
transaction = Transaction.from_redis(
self.r,
json.loads(
self.r.blpop(TRANSACTION_QUEUE_KEY)[1].decode('utf-8')))
print("found a transaction, adding it to block")
block.add_transaction(transaction)
# create a new transaction that creates a lazycoin and gives it to the user
print("Block is full, now add a create transaction")
print("Prev hash = ", prev_hash)
create = Transaction(
prev_hash=prev_hash,
transaction_type='CREATE',
sender=self.user.pub,
receiver=self.user.pub,
)
# sign this transaction and add the signature to the transaction
print("signing transaction")
msg, sign = self.user.sign(create)
create.add_signature(sign)
print("adding transaction")
block.add_transaction(create)
print("finding nonce")
nonce = self.solve_puzzle(block)
block.add_nonce(nonce)
print("block done")
if self.stop_mining():
print("stopping mining")
return None
return block
def __mining(self) -> Optional[Block]:
"""挖矿"""
trans_list = self.__get_mining_trans()
with FullBlockChain.safe_use_blockchain() as blc:
block = Block(blc.get_height() + 1, blc.get_top_hash())
# 计算总交易费
fee = Btc("0")
for trans in trans_list:
fee += blc.compute_transaction_fee(trans)
block.add_transaction(trans) # 添加交易到block中
# 加上矿工奖励
fee += block.get_now_ming_btcs()
# 构造创块交易
head_trans = Transaction()
head_trans.add_output(TransOutput(address=self.address, btcs=fee))
block.set_head_transaction(head_trans)
# 正式开始挖矿
while not block.veri_hash():
if self.mine_flag:
block.randnum += MINING_ADD_NUM
block.timestap = time.time()
else: # 中止挖矿（失败了）
self.add_trans(*trans_list) # 把交易放回交易池
return None
return block
def init():
# 删除旧文件
if os.path.isfile(STORE_BLC_FILE_PATH):
os.remove(STORE_BLC_FILE_PATH)
if os.path.isfile(STORE_KEYS_FILE_PATH):
os.remove(STORE_KEYS_FILE_PATH)
# 打开N服务和B服务
NetworkRouting.get_instance().start_server()
FullBlockChain.get_instance().start_server()
# 添加创世区块
keys = [UserKey() for i in range(10)]
for key in keys:
Wallet.get_instance().add_key(key)
Miner.get_instance().set_wallet_address(keys[0].get_address())
t = Transaction()
for key in keys:
t.add_output(TransOutput(Btc("1000"), key.get_address()))
block = Block(1)
block.add_transaction(t)
head_trans = Transaction()
head_trans.add_output(TransOutput(Btc(MINING_BTCS), keys[0].get_address()))
block.set_head_transaction(head_trans)
block.find_randnum()
FullBlockChain.get_instance().add_first_block(block)
Wallet.get_instance().write_keys_to_file()
if __name__ == "__main__":
print(BlockChain.__qualname__, BlockChain.get_instance.__qualname__)
# 创建区块链
bc = BlockChain.get_instance()
print(bc.get_start_time())
# 初始的两个用户
key1 = UserKey()
key2 = UserKey()
# 初始区块的创币交易（只有输出，没有输入）
t1 = Transaction()
t1.add_output(TransOutput(Btc("5000"), key1.get_address()))
t1.add_output(TransOutput(Btc("5000"), key2.get_address()))
# 创世区块
b1 = Block()
b1.add_transaction(t1)
# 添加矿工奖励交易
mt1 = Transaction()
mt1.add_output(TransOutput(Btc(MINING_BTCS), key1.get_address()))
b1.set_head_transaction(mt1)
b1.set_index(1)
# 挖矿
b1.find_randnum()
# 添加区块
bc.add_block(b1)
# key1向key2转账
t2 = Transaction()
t2.add_input(TransInput(1, 1, 1))
t2.add_output(TransOutput(Btc("23.567"), key2.get_address()))
t2.sign_transaction(key1)
if not Verify.verify_transaction(t2):
