def find_new_chains():
func = inspect.currentframe().f_back.f_code
logging.info("Starting to find new chains")
# Get the blockchains of every other node
peers = variables.PEER_NODES
logging.debug("peers: {}".format(len(peers)))
other_chains = []
for node_url in peers:
blockchain_json = None
found_blockchain = []
url = "http://" + node_url + ":" + str(variables.PORT) + "/blocks"
try:
logging.debug("Attempting to access {}".format(node_url))
blockchain_json = requests.post(url)
except:
logging.warning("Failed to access {}, removing from peers".format(node_url))
variables.PEER_NODES.remove(node_url)
continue
# Convert the JSON object to a Python dictionary
if blockchain_json is not None:
blockchain_json = json.loads(blockchain_json.content)
for block_json in blockchain_json:
temp = Block()
temp.importjson(block_json)
if Utility.validate(temp):
logging.debug("Block validated, adding")
found_blockchain.append(temp)
else:
logging.warning("Block NOT valid, next peer")
continue
# Verify other node block is correct
logging.debug("Attempting to validate this: {}".format(found_blockchain))
validated = Utility.validate_blockchain(found_blockchain)
if validated:
logging.debug("Blockchain did validate")
other_chains.append(found_blockchain)
else:
logging.warning("Blockchain did not validate")
continue
logging.info("Ending find new chains")
return other_chains
def consensus():
func = inspect.currentframe().f_back.f_code
logging.info("Starting Consensus")
peers = variables.PEER_NODES
logging.debug("Peers: {}".format(peers))
if len(peers) == 0:
logging.info("Ending consensus, we have no peers")
return False
# Get the blocks from other nodes
other_chains = find_new_chains()
if len(other_chains) == 0:
logging.debug("no chains found")
logging.info("Ending consensus, no other chains found")
return False
if type(other_chains[0]) != type([]):
if len(other_chains) < len(variables.BLOCKCHAIN):
logging.debug("Our blockchain is bigger")
logging.info("Ending consensus, rejecting others")
return False
else:
logging.info("Ending consensus, we have one peer with a longer blockchain")
return other_chains
# If our chain isn't longest, then we store the longest chain
longest = 0
max_length = 0
for i in range(len(other_chains)):
if Utility.validate_blockchain(other_chains[i]):
chain_length = len(other_chains[i])
if chain_length > max_length:
max_length = chain_length
longest = i
if len(other_chains[longest]) == len(variables.BLOCKCHAIN):
logging.debug("Our blockchain is the same size1")
logging.info("Ending consensus, rejecting others")
return False
logging.info("Ending Consensus with a chain")
logging.debug("Consensus returned: {}".format(other_chains[longest]))
return other_chains[longest]
import logging
FORMAT = "[{%(levelname)s} %(filename)s:%(lineno)s - %(funcName)20s() ] %(message)s"
logging.basicConfig(filename='scratch.log', level=logging.DEBUG, format=FORMAT)
from Mining.Block import Block
import time
import User.User as User
import Utilities.Utility as Utility
WORK = 3
BLOCKCHAIN = []
BLOCKCHAIN.append(Utility.create_genesis_block())
while True:
if len(BLOCKCHAIN) == 2500:
break
last_block = BLOCKCHAIN[len(BLOCKCHAIN) - 1]
now = time.time()
data = [{"from": "network", "to": User.public_key, "amount": 1.0}]
done = False
block = None
while not done:
effort, pow_hash_object = Utility.genhash(last_block.index + 1, now,
data, last_block.hash)
leading_zeroes = Utility.leadingzeroes(pow_hash_object.digest())
if leading_zeroes >= WORK:
done = True
block = Block(last_block.index + 1, now, pow_hash_object.hexdigest(),
effort, data, last_block.hash)
BLOCKCHAIN.append(block)
Utility.validate_blockchain(BLOCKCHAIN)
