def add_block(self, block):
status = False
branch = self.get_branch_by_hash(block.block_header.previous_hash)
max_height = self.get_height()
if block.height > max_height:
# we're working on the tallest branch
if branch > 0:
# if an alternate branch is the tallest branch, it becomes our primary branch
self.restructure_primary_branch(branch)
branch = 0
else:
# we're not on the tallest branch, so there could be a split here
competing_branches = self.get_branches_by_prevhash(
block.block_header.previous_hash)
if competing_branches and branch in competing_branches:
branch = self.get_new_branch_number(block.block_header.hash,
block.height)
sql_strings = list()
sql_strings.append(
"INSERT INTO blocks (hash, prevhash, merkleRoot, height, nonce, timestamp, version, branch"
+ ") VALUES ('{}', '{}', '{}', {}, {}, {}, {}, {})".format(
block.block_header.hash, block.block_header.previous_hash,
block.block_header.merkle_root, block.height,
block.block_header.nonce, block.block_header.timestamp,
block.block_header.version, branch))
for transaction in block.transactions:
sql_strings.append(
"INSERT INTO transactions (hash, src, dest, amount, fee, timestamp, signature, type,"
+ " blockHash, asset, data, branch, prevHash)" +
" VALUES ('{}', '{}', '{}', {}, {}, {}, '{}', {},'{}', '{}', '{}', {}, '{}')"
.format(transaction.tx_hash, transaction.source,
transaction.destination, transaction.amount,
transaction.fee, transaction.timestamp,
transaction.signature, transaction.tx_type,
block.block_header.hash, transaction.asset,
transaction.data, branch, transaction.prev_hash))
sql_strings.append(
"UPDATE branches SET currentHash = '{}', currentHeight = {} WHERE id = {}"
.format(block.block_header.hash, block.height, branch))
try:
with sqlite3.connect(self.CHAIN_DB) as conn:
cursor = conn.cursor()
for sql in sql_strings:
cursor.execute(sql)
status = True
except sqlite3.OperationalError as err:
logger.error("Database Error: ", err.message)
return status
def start_queue(cls):
try:
context = zmq.Context(1)
# Socket facing producers
frontend = context.socket(zmq.PULL)
frontend.bind(cls.QUEUE_BIND_IN)
# Socket facing consumers
backend = context.socket(zmq.PUSH)
backend.bind(cls.QUEUE_BIND_OUT)
zmq.proxy(frontend, backend)
except Exception as e:
logger.error("could not start queue: %s", e)
raise
def start_publisher(cls):
try:
bind_to = "tcp://*:{}".format(cls.PUBSUB_PORT)
ctx = zmq.Context()
s = ctx.socket(zmq.PUB)
s.bind(bind_to)
#cls.sync_with_subscriber(bind_to)
except Exception as e:
logger.error("could not start publishing server: %s", e.message)
raise
print("Publishing...")
while True:
a = time.clock()
s.send_string(str(a))
def start_subscriber(cls):
try:
connect_to = "tcp://localhost:{}".format(cls.PUBSUB_PORT)
array_count = 10
ctx = zmq.Context()
s = ctx.socket(zmq.SUB)
s.connect(connect_to)
s.setsockopt(zmq.SUBSCRIBE, '')
#cls.sync_with_publisher(connect_to)
except Exception as e:
logger.error("could not start subscribe: %s", e.message)
raise
print("Listening...")
while True:
a = s.recv_string()
print(a)