def __init__(self, blockchain, address):
self.blockchain = blockchain
self.address = address
self.relay = RelayClient()
self.updater = Updater(self.blockchain, self.relay)
self.flag = 0
self.index = 0
class Miner:
FLAG = 1e6 #number of iteration of mining before check if the block has been found
def __init__(self, blockchain, address):
self.blockchain = blockchain
self.address = address
self.relay = RelayClient()
self.updater = Updater(self.blockchain, self.relay)
self.flag = 0
self.index = 0
def create_block(self):
self.block = Block(self.blockchain.get_last_hash(), self.address)
self.block.set_transactions(self.get_transactions())
self.index = 0
def get_transactions(self):
"""Allow to choose wich transactions will be placed in the block
For now, it just take them in the chronological order"""
ts = self.relay.get_transactions()
if ts is None:
return []
# filter invalid transactions
ts = list(filter(lambda t: t.is_valid(self.blockchain), ts))
# transactions can be valid alone and invalid together
# (e.g. 2 transactions with same sender)
if not self.block.valid_transactions(self.blockchain):
self.block.set_transactions([])
# TODO: sort as you want (fee ?)
return ts
def run(self, strategy):
"""Strategy is the function called to find the next PoW"""
print('Mining for address ' + str(self.address) + ' ', end='')
self.create_block()
while (1):
if self.flag == 0: # check relay for new block
self.flag = Miner.FLAG
if self.updater.update():
print('Downloaded new block')
print('Mining for address ' + str(self.address) + ' ',
end='')
self.create_block()
print('.', end='', flush=True) # show state to the user
self.flag = self.flag - 1
self.block.set_proof(strategy(self.index))
self.index = self.index + 1
if (self.block.good_difficulty()):
print('\nMined block ' + self.block.get_hash())
self.relay.submit_block(self.block)
self.flag = 0 #Need to take new transactions
def __init__(self, server_address, blockchain):
super().__init__(server_address, RelayHandler)
self.blockchain = blockchain
self.master = MasterClient()
self.transactions = []
# HTTP client relays, used to broadcast transactions
self.relays = []
for r in Network.get_relays():
if r != server_address:
self.relays.append(RelayClient(r))
print('Server started on ' + server_address[0] + ':' +
str(server_address[1]))
class Updater(object):
def __init__(self, blockchain, relay=None):
self.blockchain = blockchain
if relay is None:
self.relay = RelayClient()
else:
self.relay = relay
def update(self):
"""Update the blockchain from relay
Stop when blockchain is updated (next block is None)
Return True if updated, False if not
"""
debug('updating blockchain')
updated = False
new_block = self.relay.get_block(self.blockchain.get_last_hash())
while not new_block is None:
debug('got block ' + new_block.get_hash())
updated = True
self.blockchain.add_block(new_block)
new_block = self.relay.get_block(self.blockchain.get_last_hash())
return updated
def __init__(self, user_ID, password):
"""Create a new wallet
user_ID : The ID of the user to select it's own address on the DB
password : The password is used to generate a AES_Key to ecrypt / decrypt the private key on DB
Here, we used it to load all the address or write the new address
"""
self.blockChain = Blockchain('client')
self.relay = RelayClient()
self.updater = Updater(self.blockChain, self.relay)
self.updater.update()
self.user_ID = user_ID
self.addrList = loadAddressList(self.user_ID) # list of address
self.last = len(self.addrList) - 1 #index of the actual address
if self.addrList == []: #New Wallet : Create the first Address
self.addr = Address()
self.addr.encryptPrivateKey(password)
add_address(self.user_ID, self.addr, 0)
self.addrList.append(self.addr)
else:
self.addr = self.addrList[len(self.addrList) - 1]
self.count = self.blockChain.get_amount_of_address(self.addr)
def __init__(self, blockchain, relay=None):
self.blockchain = blockchain
if relay is None:
self.relay = RelayClient()
else:
self.relay = relay
if relay.submit_transaction(t):
print('transaction sent to the network')
else:
print('error sending transaction')
def usage():
exit('usage: python3 '+av[0]+' list|new|transfer')
if __name__ == '__main__':
# init database
db.createDB()
# always update blockchain
bc = Blockchain('client')
relay = RelayClient()
u = Updater(bc, relay)
print('updating blockchain ...')
u.update()
# parse arguments
av = sys.argv
ac = len(av)
if ac == 1:
usage()
if av[1] == 'list':
display_addresses(bc)
elif av[1] == 'new':
create_address()
elif av[1] == 'transfer':
class Wallet(object):
"""Wallet is the principal user
Wallet have money and can create some Transaction to send money to an another Wallet
"""
def __init__(self, user_ID, password):
"""Create a new wallet
user_ID : The ID of the user to select it's own address on the DB
password : The password is used to generate a AES_Key to ecrypt / decrypt the private key on DB
Here, we used it to load all the address or write the new address
"""
self.blockChain = Blockchain('client')
self.relay = RelayClient()
self.updater = Updater(self.blockChain, self.relay)
self.updater.update()
self.user_ID = user_ID
self.addrList = loadAddressList(self.user_ID) # list of address
self.last = len(self.addrList) - 1 #index of the actual address
if self.addrList == []: #New Wallet : Create the first Address
self.addr = Address()
self.addr.encryptPrivateKey(password)
add_address(self.user_ID, self.addr, 0)
self.addrList.append(self.addr)
else:
self.addr = self.addrList[len(self.addrList) - 1]
self.count = self.blockChain.get_amount_of_address(self.addr)
def backAddress(self):
"""Return to the previous address
"""
if len(self.addrList) >= 2:
self.addr = self.addrList[len(addrList) - 2]
self.addrList.pop(self.addrList[len(self.addrList) - 1])
def checkUpdate(self):
"""Update the amount and the blockChain
"""
self.updater.update()
self.count = self.blockChain.get_amount_of_address(self.addr)
def createTransaction(self, password, destList):
"""Create a new transaction and send it to the RelayNode
destList is a list of tuples
Each tuples is like : (str_address, value)
The last transaction is the rest of the wallet send to the new user address
"""
self.checkUpdate()
newAddr = Address()
newAddr.encryptPrivateKey(password)
total = sum([i[1] for i in destList])
if total <= self.count:
destList.append((str(newAddr), (self.count - total)))
transac = Transaction(self.addr.public(), destList)
self.addr.decryptPrivateKey(password)
transac.sign(self.addr)
debug('valid: ' + ('True' if transac.is_signed() else 'False'))
self.addr.encryptPrivateKey(password)
if not self.relay.submit_transaction(transac):
return False
self.addrList.append(newAddr)
self.addr = newAddr
add_address(self.user_ID, self.addr, len(self.addrList) - 1)
return True
else:
return False