def NewUser(self, uname, encoded_udata):
hashed_uname = sm3_hash(list(bytes(uname, "UTF-8")))
self.cursor.execute("INSERT INTO User(HashedName, Data) VALUES(?, ?)",
(
hashed_uname,
encoded_udata,
))
self.connection.commit()
def GetUserData(self, uname):
hashed_uname = sm3_hash(list(bytes(uname, "UTF-8")))
result_set = self.cursor.execute(
"SELECT Data FROM User WHERE HashedName=?", (hashed_uname, ))
data = result_set.fetchone()
if data == None:
return None
return data[0]
def miner():
global difficulty
sleep(5)
print(">>>广播@%d: 矿工已启动" % time())
try:
while True:
try:
r = requests.get("http://127.0.0.1:8888/list").json()
node_list = r["list"]
difficulty = max(difficulty, r["difficulty"])
except:
print(">>>广播@%d: 无法连接节点tracker" % time())
continue
last_block = blockchain.last_block
if last_block == []:
nonce = 0
else:
nonce = last_block["nonce"]
pow = 0
while True:
guess = f"{nonce}{pow}".encode()
guess_hash = sm3_hash(list(guess))
if guess_hash[:difficulty] == "".join(
["0" for i in range(difficulty)]):
print(">>>广播@%d: 计算出POW: %d" % (time(), pow))
break
pow += 1
# 检验POW、同步区块
successful = 0
# 发送者为 "0" 表明是新挖出的币
blockchain.new_transaction({
"sender": "0",
"recipient": address,
"amount": 1,
"timestamp": time()
})
broadcast = blockchain.new_block()
broadcast["pow"] = pow
for url in node_list:
try:
r = requests.post("http://%s:%d/checkpow" %
(url["addr"], url["port"]),
json=broadcast)
except:
continue
if r.status_code == 200:
successful += 1
if successful >= len(node_list["list"]):
break
continue
# 半数以上节点通过即可
if successful >= len(node_list):
print(">>>广播@%d: %s 获得1个奖励币" % (time(), address[:10]))
else:
blockchain.chain.remove(blockchain.last_block) # 删除新生成的区块
continue
except KeyboardInterrupt:
return
def valid_pow(self, last_nonce, pow):
guess = f"{last_nonce}{pow}".encode()
guess_hash = sm3_hash(list(guess))
return guess_hash[:difficulty] == "".join(
["0" for i in range(difficulty)])
def hash(block):
block_string = json.dumps(block, sort_keys=True).encode()
return sm3_hash(list(block_string))
def __sm3Hash(self, inputStr):
return sm3_hash(list(bytes(inputStr, "UTF-8")))