至此,已经完成了:交易记录,区块的开发,现在进行区块链的开发就比较容易了。实现代码如下:
from Block import InvalidBlock, Block
from Message import InvalidMessage, DaDaMessage
from Transaction import Transaction
# 区块链
class Dada_BlockCoin:
def __init__(self):
self.blocklist = [] # 装载所有区块
def validate(self):#校验所有区块
for i, block in enumerate(self.blocklist):
try:
block.validate()
except InvalidBlockCoin as e:
raise InvalidBlockCoin("区块校验错误,区块索引{}".format(i))
def add_block(self, block): # 增加区块
if len(self.blocklist) > 0:
block.link(self.blocklist[-1]) #连接区块
block.seal()#密封
block.validate()#校验
self.blocklist.append(block)#添加到区块链中
def __repr__(self):
return "Dada_BlockCoin:{}".format(len(self.blocklist))
自定义异常:
class InvalidBlockCoin(Exception):
def __init__(self, *args, **kwargs):
super(Exception, self).__init__(*args, **kwargs)
编写测试模块:
if __name__ == "__main__":
t1 = Transaction("yicheng", "ddd1", 100)
t2 = Transaction("yicheng", "ddd2", 200)
t3 = Transaction("yicheng", "ddd3", 300)
t4 = Transaction("yicheng", "ddd4", 400)
t5 = Transaction("yicheng", "ddd5", 500)
t6 = Transaction("yicheng", "ddd6", 600)
m1 = DaDaMessage(t1)
m2 = DaDaMessage(t2)
m3 = DaDaMessage(t3)
m4 = DaDaMessage(t4)
m5 = DaDaMessage(t5)
m6 = DaDaMessage(t6)
try:
yin1 = Block(m1, m2)
yin1.seal()
yin2 = Block(m3, m4)
yin2.seal()
yin3 = Block(m5, m6)
yin3.seal()
# 篡改区块
#yin3.messagelist.append(m1)
coin = Dada_BlockCoin() # 区块链
coin.add_block(yin1)
coin.add_block(yin2)
coin.add_block(yin3)
coin.validate()
print(coin)
except InvalidMessage as e:
print(e)
except InvalidBlock as e:
print(e)
except InvalidBlockCoin as e:
print(e)
测试结果如下:
篡改区块链,测试模块区块链的内容,可以任意篡改,测试结果如下:
这里已经完成了数据层的部分开发,其余部分后续会完善。
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