def final_addr_balance(self, addr):
""" This function scans the complete blockchain and returns
the total balance of an Address """
chain_length = self.redis_client.llen('chain')
total = 0
used_transactions = set()
while chain_length > 0:
block = Block.from_json(
json.loads(
self.redis_client.lindex('chain', chain_length -
1).decode('utf-8')))
for tx in block.transactions:
for inp in tx.inputs:
if inp.address == addr:
used_transactions.add((inp.previous_tx, inp.index))
for out_index, out in enumerate(tx.outputs):
if tx.hash not in used_transactions:
if out.address == addr:
total = total + out.value
else:
if out.address == addr and (
tx.hash, out_index) not in used_transactions:
total = total + out.value
chain_length -= 1
return total
def get_block_by_hash(self, hash: str) -> Block:
chain_length = self.redis_client.llen('chain')
while chain_length > 0:
block = Block.from_json(
json.loads(
self.redis_client.lindex('chain', chain_length -
1).decode('utf-8')))
if block.hash == hash:
return block
chain_length -= 1
return
def get_tx_by_hash(self, hash: str):
chain_length = self.redis_client.llen('chain')
while chain_length > 0:
block = Block.from_json(
json.loads(
self.redis_client.lindex('chain', chain_length -
1).decode('utf-8')))
for tx in block.transactions:
if tx.hash == hash:
return tx
chain_length -= 1
return
def full_chain_verify(self):
verify_message = "unverified"
if self.chain_length == 0:
return "Empty Chain! Verification failed!"
for i in range(0, self.chain_length):
raw = json.loads(self.redis_client.lindex('chain', i).decode('utf-8'))
block = Block.from_json(raw)
block.calculate_merkle_root()
v_merkl_root = block.merkle_root
if v_merkl_root != raw["merkle_root"]:
verify_message = "failed"
self.del_from_faultblock(i)
return verify_message
verify_message = "verified"
return verify_message
def sendblock(self, request=None, response=None):
""" Send block """
if request is None and response is None:
# If no data is being passed on by command handler
pass
if request is not None:
# Processing requests
UDPHandler.broadcastmessage(
json.dumps({
"prev_command": "sendblock",
"body": request
}))
if response is not None:
# Processing reaponse
blkc = BlockChain()
blkc.add_block(Block.from_json(response["body"]))
blkc.close()
def get_txs_by_addr(self, addr) -> List[Transaction]:
txs = []
chain_length = self.redis_client.llen('chain')
while chain_length > 0:
block = Block.from_json(
json.loads(
self.redis_client.lindex('chain', chain_length -
1).decode('utf-8')))
print(len(block.transactions))
for tx in block.transactions:
inp_adresses = [inp.address for inp in tx.inputs]
if addr in inp_adresses:
txs.append(tx)
continue
out_adresses = [out.address for out in tx.outputs]
if addr in out_adresses:
txs.append(tx)
continue
chain_length -= 1
return txs
def get_utxos_by_addr(self, addr) -> List[Tuple[str, int, float]]:
utxos = []
chain_length = self.redis_client.llen('chain')
used_transactions = set()
while chain_length > 0:
block = Block.from_json(
json.loads(
self.redis_client.lindex('chain', chain_length -
1).decode('utf-8')))
for tx in block.transactions:
for inp in tx.inputs:
if inp.address == addr:
used_transactions.add((inp.previous_tx, inp.index))
for out_index, out in enumerate(tx.outputs):
if tx.hash not in used_transactions:
if out.address == addr:
utxos.append((tx.hash, out_index, out.value))
else:
if out.address == addr and (
tx.hash, out_index) not in used_transactions:
utxos.append((tx.hash, out_index, out.value))
chain_length -= 1
return utxos
def get_block(self, index: int) -> Block:
raw = self.redis_client.lindex("chain", index)
if raw is not None:
return Block.from_json(json.loads(raw.decode("utf-8")))
else:
return