def loginAPI():
global internal_storage, interruptQueue
pub_hex = request.values.get("pub_key")
pub_key = pub_hex
internal_storage["Public_key"] = pub_key
priv_hex = request.values.get("priv_key")
priv_key = priv_hex
internal_storage["Private_key"] = priv_key
if getNeighbours(self_address):
# not the first one
# request latest block as json
current_block = requestLatestBlock()
data = json.loads(current_block)
tx_list = []
for tx in data['Tx_list']:
tx_list.append(createTxFromDict(tx))
# build block
b = createBlockFromDict(tx_list, data)
# update state
bc = blockChain.Blockchain(_block=b)
internal_storage["Miner"] = miner.Miner(
_blockchain=bc,
_pub=pub_key,
_priv=priv_key
)
else:
# create first block
internal_storage["Miner"] = miner.Miner(_blockchain=None,
_pub=pub_key,
_priv=priv_key)
generator = internal_storage["Miner"].mineBlock()
try:
interruptQueue = next(generator)
block_data = next(generator)
internal_storage["Miner"].broadcastBlock(
_block_data=block_data,
_neighbours=internal_storage["Neighbour_nodes"],
_self_addr=self_address,
)
except StopIteration:
print("MinerApp Interrupted")
# re-routes back to homepage
return homePage()
def __init__(self, _public_key, _blockchain=None):
# create new miner with fields:
self.blockchain = _blockchain
self.tx_list = []
self.balance = 0
self.address = _public_key
# if this is ever invoked, it must be the first block
# of the first miner
if self.blockchain is None:
# create new blockchain with empty data
self.blockchain = blockChain.Blockchain(
block.Block(_transaction_list=[
# initial empty transaction
transaction.Transaction(self.address, self.address,
self.balance, "Init Tx")
]))
def handleBroadcastedBlock(self, _block):
# create if None
if self.blockchain is None:
self.blockchain = blockChain.Blockchain(_block)
else:
self.blockchain.addBlock(_block, _block.prev_header)
# save tx
saved_tx = []
for tx in self.tx_pool:
if tx not in _block.state["Tx_pool"]:
saved_tx.append(tx)
# use other person's tx pool
self.tx_pool = _block.state["Tx_pool"]
# re-add
for tx in saved_tx:
self.tx_pool.append(tx)
return True
def createInitialBlockchain():
priv, pub = keyPair.GenerateKeyPair()
t = transaction.Transaction(_sender_public_key=pub,
_receiver_public_key=pub,
_amount=100,
_comment="Reward",
_reward=True)
t.sign(priv)
b = block.Block([t])
q_find = manager.Queue()
q2 = manager.Queue()
p = b.build(q_find, q2)
p.start()
p.join()
nonce = q_find.get()
print("Nonce1:", nonce)
b.completeBlockWithNonce(nonce)
b.executeChange()
bc = blockChain.Blockchain(_block=b)
return priv, pub, b, bc
def mineBlock(self):
print("Mining...")
time.sleep(1)
# wait till tx_pool is not empty
if self.blockchain is not None:
while not self.tx_pool:
time.sleep(1)
# While there is no new block that is of a longer len than this miner's blockchain, keep mining till completed.
interruptQueue = Queue()
nonceQueue = Queue()
yield interruptQueue
# if this is ever invoked, it must be the first block
# of the first miner
if self.blockchain is None:
tx = transaction.Transaction(
_sender_public_key=self.client.publickey,
_receiver_public_key=self.client.publickey,
_comment="Hello world",
_amount=0,
_reward=True
)
tx.sign(self.client.privatekey)
first_block = block.Block(
_transaction_list=[tx],
_difficulty=1,
)
p = first_block.build(_found=nonceQueue, _interrupt=interruptQueue)
p.start()
p.join()
nonce_found = nonceQueue.get()
if nonce_found == "":
print("interrupted!")
return
first_block.completeBlockWithNonce(_nonce=nonce_found)
first_block.tx_list = [tx.data]
first_block.executeChange()
self.blockchain = blockChain.Blockchain(_block=first_block)
else:
# validate the transactions
temp_pool = []
print("Getting from tx_pool...-->", self.tx_pool)
print("Current:", self.blockchain.current_block.state)
while len(self.tx_pool) > 0 and len(temp_pool) <= 10:
item = self.tx_pool.pop(0)
# create transaction
t = transaction.Transaction(
item["Sender"],
item["Receiver"],
item["Amount"],
item["Comment"],
item["Reward"],
item["Signature"]
)
temp_pool.append(t)
temp_pool.append(
self.createRewardTransaction(self.client.privatekey))
print("----> TEMP POOL:", temp_pool)
newBlock = block.Block(
_transaction_list=temp_pool,
_prev_header=self.blockchain.current_block.header,
_prev_block=self.blockchain.current_block,
)
p = newBlock.build(_found=nonceQueue, _interrupt=interruptQueue)
p.start()
p.join()
nonce_found = nonceQueue.get()
if nonce_found == "":
return # stop here
newBlock.completeBlockWithNonce(_nonce=nonce_found)
newBlock.executeChange()
print("newBlock--->", newBlock.state, newBlock.tx_list)
self.blockchain.addBlock(
_incoming_block=newBlock,
_prev_block_header=newBlock.prev_header
)
to_broadcast = self.blockchain.current_block.getData()
yield to_broadcast
