def get_main_block_pool():
"""creates a dummy chain in a pool"""
pool = BlockPool()
prev_hash = "0"
for i in range(100):
b = MainBlock(prev_hash, "miner" +
str(i), "difficulty", [], [], [])
b.height = i
prev_hash = b.hash()
pool.add_block(b)
return pool
def __init__(self):
threading.Thread.__init__(self)
#self.wallet = wallet_database.load_wallet()
self.p2p_api = P2P_API()
self.vote_pool = VotePool()
self.tx_pool = TransactionPool()
self.vtx_pool = TransactionPool()
self.main_block_pool = BlockPool()
self.shard_block_pool = BlockPool()
self.event_manager = self.p2p_api.event_mg
self.stop = threading.Event()
self.state = State.DEFAULT
def test_with_shard_block():
p = BlockPool()
sb1 = ShardBlock("0", "1", "2", [])
sb1.height = 50000
p.add(sb1)
assert p.get_blocks_by_height(50000) == [sb1]
p.remove(sb1)
assert not p.get_blocks_by_height(50000)
assert not p.get_block_dict()
def test_remove_non_existing_block():
p = BlockPool()
mb1 = MainBlock("0", "1", "2", [], [], [])
with pytest.raises(ValueError):
p.remove(mb1)
mb2 = MainBlock("3", "4", "5", [], [], [])
p.add(mb2)
with pytest.raises(ValueError):
p.remove(mb1)
def test_current_height():
p = BlockPool()
mb1 = MainBlock("0", "1", "2", [], [], [])
mb2 = MainBlock("3", "4", "5", [], [], [])
mb1.height = 100
mb2.height = 101
p.add(mb1)
assert p.get_current_height() == 100
p.add(mb2)
assert p.get_current_height() == 101
def test_pool():
p = BlockPool()
assert p.get_current_height() == 0
assert not p.get_block_dict()
mb = MainBlock("0", "1", "2", [], [], [])
p.add(mb)
assert p.get_block_dict()[mb.height][0] == mb
def test_add_and_remove_fork_block():
height = 100
p = BlockPool()
mb1 = MainBlock("0", "1", "2", [], [], [])
mb2 = MainBlock("3", "4", "5", [], [], [])
mb1.height = height
mb2.height = height
p.add(mb1)
p.add(mb2)
assert p.get_block_dict()[height] == [mb1, mb2]
p.remove(mb1)
assert p.get_block_dict()[height] == [mb2]
class Client(threading.Thread):
"""this class does all the previously described tasks"""
fields = [
("wallet", Wallet),
("p2p_api", P2P_API),
("vote_pool", VotePool),
("tx_pool", TransactionPool),
("vtx_pool", TransactionPool),
("main_block_pool", BlockPool),
("shard_block_pool", BlockPool),
("event_manager", EventManager),
("event_stop", threading.Event),
("state", State),
("current_difficulty", str),
("current_height", int),
("stable_height", int),
("last_fork_height", int)
]
def __init__(self):
threading.Thread.__init__(self)
#self.wallet = wallet_database.load_wallet()
self.p2p_api = P2P_API()
self.vote_pool = VotePool()
self.tx_pool = TransactionPool()
self.vtx_pool = TransactionPool()
self.main_block_pool = BlockPool()
self.shard_block_pool = BlockPool()
self.event_manager = self.p2p_api.event_mg
self.stop = threading.Event()
self.state = State.DEFAULT
# self.start()
def connect(self, connect_to_peer: Peer=None):
"""
lets you connect to a peer
or connects you to the list of peers in the config file
"""
if connect_to_peer:
self.p2p_api.connect(connect_to_peer)
else:
for peer_to_connect_to in get_peer_list():
self.p2p_api.connect(peer_to_connect_to)
def run(self):
"""method required by threading to start a thread"""
loggerutil.info("client update started")
self.update()
loggerutil.info("client update complete")
loggerutil.info("client started")
self.loop()
loggerutil.info("client stopped")
def update(self):
"""updates a client to the current state of the network"""
self.state = State.UPDATING
# blocking call, connects this peer to other known peers
standalone = self.connect()
if not standalone:
# blocking calls
self.current_difficulty = p2p_api.get_current_difficulty()
self.current_height = p2p_api.get_current_height()
# get last stable chain height
# (stable means no forks and 7 confirmations)
self.stable_height = block_database.get_stable_height()
loggerutil.debug("client connected")
# blocking call
client_net = self.p2p_api.list_peers_in_net(self.peer)
loggerutil.debug(
"Client with host {0} - Current state of the net {1}".format(self.peer_host, client_net))
# init all the pools
# blocking call only returns list of missing blocks
self.p2p_api.update_chain(
self.my_height, self.current_height)
# go over all the blocks that came along since this client was last
# online
for b in block_list:
self.main_block_pool.add_block(b)
# not blocking call because peers could have different versions of the
# pool, makes the p2p api request blocks from different peers and send
# them all to this client
self.p2p_api.update_block_pool()
# not blocking call because peers could have different versions of the
# pool, makes the p2p api request blocks from different peers and send
# them all to this client
self.p2p_api.update_tx_pool()
# here we should be finished with the update of the client (except for
# all blocks in pool and tx in pool)
else:
self.stable_height = block_database.get_stable_height()
self.current_height = self.current_height
if self.stable_height == 0:
self.main_block_pool.add(
client_genesis_generator.generate_genesis_block())
def loop(self):
"""this method loops for ever until it is stopped by force or with the "stop" event"""
while True:
if self.stop.isSet():
loggerutil.debug("shutting down client")
break
if self.manage_events():
loggerutil.debug("shutting down client due to an error")
break
def validate_block(block: str) -> bool:
"""a lot of steps to validate if a block is correct"""
return True
def validate_tx(tx: str) -> bool:
"""a lot of steps to validate if a tx is correct"""
return True
def manage_events(self) -> bool:
"""
Manages all functionality that has to be asynchronous.
All these events can be set by the p2p api, the client then handles these events in its own thread
returns a bool that is only True if the client needs to be shut down in case of an error
"""
# get data from the p2p
if self.event_manager.block_received.isSet():
block = self.p2p_api.get_recv_block(self.peer_host)
loggerutil.debug(
"block received event is triggered by: {0}:".format(self.peer_host))
loggerutil.debug("Block string: {0}".format(block))
self.event_manager.block_received.clear()
handle_new_block(block)
if self.event_manager.tx_received.isSet():
tx = self.p2p_api.get_recv_tx(self.peer_host)
loggerutil.debug(
"transaction received event is triggered by: {0}:".format(self.peer_host))
loggerutil.debug("Tx string: {0}".format(tx))
self.event_manager.tx_received.clear()
handle_new_tx(tx)
# give data to the p2p
if self.event_manager.height_request.isSet():
client_height = len(self.chain) - 1
self.p2p_api.send_height(self.peer_host, client_height)
# do stuff
self.event_manager.height_request.clear()
if self.event_manager.block_request.isSet():
# returns list of requested block numbers
number_list = self.p2p_api.get_requ_block_numbers()
# get the highest block from the number list
last_num_from_list = number_list[-1]
# check if the highest blockchain of a client is the same as from
# the list
if len(self.chain) == last_num_from_list:
# send the blocks that are missing from smaller chains
for number in number_list:
self.p2p_api.send_block(number, self.chain[number - 1])
# do stuff
self.event_manager.block_request.clear()
if self.event_manager.tx_request.isSet():
# do stuff
self.event_manager.tx_request.clear()
if self.event_manager.tx_pool_request.isSet():
self.p2p_api.send_pool(self.pool.string())
self.event_manager.tx_pool_request.clear()
if self.event_manager.bootstr_request.isSet():
from_block_number, to_block_number, receiver = self.p2p_api.get_requ_bootstr_numbers()
temp = []
# fill temp with the blocks from and to
self.p2p_api.send_bootstr(receiver, temp)
# do stuff
self.event_manager.bootstr_request.clear()
if self.event_manager.connection_lost.isSet():
# reconnect maybe ? (probably not till milestone 4)
# do stuff
self.event_manager.connection_lost.clear()
if self.event_manager.error.isSet():
loggerutil.debug("shutdown event is triggered")
# loggerutil.error(self.p2p_api.get_error_message())
# shut down the client after logging the error
self.p2p_api.stop_peer_thread(self.peer)
return True
return False
def handle_new_block(self, block):
"""handles blocks received from the p2p network"""
if isinstance(block, MainBlock):
handle_new_main_block(block)
elif isinstance(block, ShardBlock):
handle_new_shard_block(block)
else:
loggerutil.error(
"received block that was neither main nor shard block")
def handle_new_main_block(self, main_block: MainBlock):
self.main_block_pool.add_block(main_block)
loggerutil.debug("got new main_block: " + main_block.str())
def handle_new_shard_block(self, shard_block: ShardBlock):
self.shard_block_pool.add_block(shard_block)
loggerutil.debug("got new shard_block: " + shard_block.str())
def handle_new_tx(self, tx):
"""handles tx received from the p2p network"""
if isinstance(tx, Transaction):
handle_new_transaction(tx)
elif isinstance(tx, VotingTokenTransaction):
handle_new_vtx(tx)
else:
loggerutil.error("received tx that was neither tx nor vtx")
def handle_new_transaction(self, tx: Transaction):
self.tx_pool.add_transaction(tx)
loggerutil.debug("got new tx: " + tx.str())
def handle_new_vtx(self, vtx: VotingTokenTransaction):
self.vtx_pool.add_transaction(tx)
loggerutil.debug("got new vtx: " + vtx.str())