def form_chains(self):
self.chains = []
cboard = self.current_board
for color in (BLACK, WHITE):
for block in cboard.iterate_blocks(color):
block.chain = None
for block1 in cboard.iterate_blocks(color):
if block1.chain: continue
chain = Chain()
self.chains.append(chain)
chain.add_block(block1)
block_added = True
while block_added:
block_added = False
for block2 in cboard.iterate_blocks(color):
if block2.chain: continue
for block3 in chain.blocks.values():
if len(
cboard.block_connection_status(
block3.get_origin(),
block2.get_origin())) >= 2:
chain.add_block(block2)
block_added = True
break
def test_many_transaction_in_genesis_block_fails(self):
b = self._create_genesis_block(self.w1)
b.add_transaction(self.w1.send_funds(self.w2.address, 1))
c = Chain()
c.difficulty = 2
c.add_block(b)
self.assertFalse(c.is_valid())
def sync_local():
local_chain = Chain([])
#We're assuming that the folder and at least initial block exists
if os.path.exists(CHAINDATA_DIR):
for filepath in glob.glob(os.path.join(CHAINDATA_DIR, '*.json')):
with open(filepath, 'r') as block_file:
try:
block_info = json.load(block_file)
except:
print filepath
local_block = Block(block_info)
local_chain.add_block(local_block)
return local_chain
def sync_local(sync_es=False):
local_chain = Chain([])
if os.path.exists(CHAINDATA_DIR):
for filepath in sorted(glob.glob(os.path.join(CHAINDATA_DIR,
'*.json'))):
with open(filepath, 'r') as block_file:
try:
block_info = json.load(block_file)
except:
raise Exception("block error")
if sync_es:
es.insert_document(block_info)
local_block = Block(block_info)
local_chain.add_block(local_block)
return local_chain
def verify_block(self, block):
# what the f**k
new_block = Block()
new_block.transactions = []
for t in block['transactions']:
t_new = Transaction(t['sender'], t['destination'], t['contents'],
t['signature'], t['contents_hash'],
t['timestamp'])
new_block.transactions.append(t_new)
new_block.timestamp = block['timestamp']
new_block.previous_hash = block['previous_hash']
new_block.nonce = block['nonce']
new_block.block_hash = block['block_hash']
new_block.pow_hash = block['pow_hash']
if Verification.verify_all_signatures(new_block):
Chain.add_block(new_block)
return True
else:
return False
def run():
# Create chain to hold ledger
chain = Chain()
print("\n## Created chain with origin block. ##\n")
print(chain)
print("\n")
# Add blocks
chain.add_block("This is the first real block!")
print(" >> Added block 1. <<\n")
chain.add_block({'name': 'new block', 'type':'test'})
print(" >> Added block 2. <<\n")
chain.add_block({'name': 'some other type of data', 'series':['a', 'b', 'c']})
print(" >> Added block 3. <<\n")
# Let's take a look at our chain
for i in range(len(chain.ledger)):
print(chain.ledger[i])
print("\n")
def main():
logging.basicConfig(level=logging.DEBUG)
UTXOs = {} # Unspend transaction outputs, used by wallets and transactions
c = Chain()
w1 = Wallet(UTXOs)
w2 = Wallet(UTXOs)
# Make the 1st transaction and generate all coins in the blockchain
genesis_block = Block()
genesis_transaction = w1.send_funds(w1.address, 100)
genesis_block.add_transaction(genesis_transaction)
c.add_block(genesis_block)
# Let's spend some coins
b2 = Block()
b2.add_transaction(w1.send_funds(w2.address, 1))
b2.add_transaction(w1.send_funds(w2.address, 2))
c.add_block(b2)
# Mine a block just for fun
c.add_block(Block())
# Content of the blockchain
c.print()
print('Chain is valid:', c.is_valid())
print('w1 balance:', w1.balance)
print('w2 balance:', w2.balance)
def test_add_genesis_block(self):
b = self._create_genesis_block(self.w1)
c = Chain()
c.add_block(b)
self.assertTrue(c.is_valid())
# Show Advertised Transactions to start Verification
print('Verification Start:')
transacts = miner1.show()
# Start Mining
print('Mining...')
h2 = miner1.mine(transacts.copy())
# Start of Consensus Mechanism. If Consensus happens, the block gets added to the Chain.
print('Trying to Achieve Consensus:')
if (miner2.consensus(h2) == 1 and miner3.consensus(h2) == 1):
print('Verified.')
print('Creating Block')
print('Adding Block to Chain')
blockchain.add_block(h2)
else:
print("Can't Verify.")
# Show information in the Blockchain Now
print('Printing Complete Blockchain:')
c = 1
for i in blockchain.chn:
print('Block', c)
print('Transactions')
for j in i._transactions:
print(j.sender, 'to', j.receiver, 'Amount:', j.amount, 'Fees:', j.fees)
print('Own Hash', i.get_hash())
print('Previous Hash', i.get_prev())
print()
c += 1
##################################### block_one = Block(block_one_dir) block_two = Block(block_two_dir) blockchain = Chain([block_zero, block_one, block_two]) print blockchain print blockchain.is_valid() print len(blockchain) assert blockchain.is_valid() assert len(blockchain) == 3 empty_chain = Chain([]) assert len(empty_chain) == 0 empty_chain.add_block(block_zero) assert len(empty_chain) == 1 #empty_chain = Chain([]) #assert len(empty_chain) == 0 print empty_chain print len(empty_chain) sys.exit(0) #..... assert blockchain == another_blockchain assert not blockchain != another_blockchain assert blockchain <= another_blockchain assert blockchain >= another_blockchain
#
# App main module (script)
#
# 13.09.2018 Created by: zhenya
################################################################################
from chain import Chain
block_one_transactions = {"sender": "Alice", "receiver": "Bob", "amount": "50"}
block_two_transactions = {"sender": "Bob", "receiver": "Cole", "amount": "25"}
block_three_transactions = {
"sender": "Alice",
"receiver": "Cole",
"amount": "35"
}
fake_transactions = {
"sender": "Bob",
"receiver": "Cole, Alice",
"amount": "25"
}
local_blockchain = Chain()
local_blockchain.print_blocks()
local_blockchain.add_block(block_one_transactions)
local_blockchain.add_block(block_two_transactions)
local_blockchain.add_block(block_three_transactions)
local_blockchain.print_blocks()
local_blockchain.blocks[2].transactions = fake_transactions
local_blockchain.validate_chain()
prevnumber = chain.state.block_number
for i in range(0, 20):
print("iteration " + str(i))
block = Block(
BlockHeader(timestamp=int(time.time()),
prevhash=prevhash,
number=prevnumber + 1))
t = trie.Trie(EphemDB())
for j in range(0, 3):
transaction = transactions.Transaction(i * 3 + j, '', "192.172.9.1/28",
0, 'data', 1, 1, 1)
block.transactions.append(transaction)
t.update(rlp.encode(j), rlp.encode(transaction))
block.header.tx_root = t.root_hash
chain.add_block(block)
prevhash = block.hash
prevnumber = prevnumber + 1
chain.process_time_queue()
time.sleep(2) # para que timestamp (padre) != timestamp (hijo)
block = chain.get_block_by_number(2)
print("nonces for block " + str(2) + ": (" + str(len(block.transactions)) +
" transactions in block)")
for tx in block.transactions:
print(tx.nonce)
rand = randint(0, 20)
block = chain.get_block_by_number(rand)
print("type of second block: " + str(type(block)))
print("nonces for block " + str(rand) + ": (" + str(len(block.transactions)) +
assert not block_one_invalid_obj.is_valid() ##################################### # # Bringing Chains into play # ##################################### blockchain = Chain([block_zero, block_one, block_two]) assert blockchain.is_valid() assert len(blockchain) == 3 empty_chain = Chain([]) assert len(empty_chain) == 0 empty_chain.add_block(block_zero) assert len(empty_chain) == 1 empty_chain = Chain([]) assert len(empty_chain) == 0 another_blockchain = Chain([another_block_zero, another_block_one, another_block_two]) assert another_blockchain.is_valid() assert len(another_blockchain) == 3 assert blockchain == another_blockchain assert not blockchain != another_blockchain assert blockchain <= another_blockchain assert blockchain >= another_blockchain assert not blockchain > another_blockchain assert not another_blockchain < blockchain
# print(f.length())
# f.show_tail()
# print(f.find(Block('3')))
# print(f.find('3'))
# print(f.find(Block('8')))
# print(f.find('8'))
# for i in f:
# print(i.data)
# print(hash(i.data))
c = Chain()
c.add_transaction('1')
c.add_transaction('2')
c.add_transaction('3')
c.add_block()
print(c.last_block().data)
print(c.last_block().hash)
print(c.last_block().prev_hash)
for i in c.last_block().data:
print(i.data)
c.add_transaction('4')
c.add_transaction('5')
c.add_transaction('6')
c.add_block()
print(c.last_block().data)
print(c.last_block().hash)
print(c.last_block().prev_hash)
for i in c.last_block().data:
print(i.data)