async def test_header_gap_fill_detects_invalid_attempt(caplog,
event_loop,
event_bus,
chaindb_with_gaps,
chaindb_1000,
chaindb_uncle):
client_context = ChainContextFactory(headerdb__db=chaindb_with_gaps.db)
server_context = ChainContextFactory(headerdb__db=chaindb_uncle.db)
peer_pair = LatestETHPeerPairFactory(
alice_peer_context=client_context,
bob_peer_context=server_context,
event_bus=event_bus,
)
async with peer_pair as (client_peer, server_peer):
client = SequentialHeaderChainGapSyncer(
LatestTestChain(chaindb_with_gaps.db),
chaindb_with_gaps,
MockPeerPoolWithConnectedPeers([client_peer], event_bus=event_bus)
)
server_peer_pool = MockPeerPoolWithConnectedPeers([server_peer], event_bus=event_bus)
uncle_chaindb = AsyncChainDB(chaindb_uncle.db)
async with run_peer_pool_event_server(
event_bus, server_peer_pool, handler_type=ETHPeerPoolEventServer
), background_asyncio_service(ETHRequestServer(
event_bus, TO_NETWORKING_BROADCAST_CONFIG, uncle_chaindb,
)):
server_peer.logger.info("%s is serving 1000 blocks", server_peer)
client_peer.logger.info("%s is syncing up 1000", client_peer)
# We check for 499 because 500 exists from the very beginning (the checkpoint)
expected_block_number = 499
async with background_asyncio_service(client):
try:
await wait_for_head(
chaindb_with_gaps,
chaindb_1000.get_canonical_block_header_by_number(expected_block_number),
sync_timeout=5,
)
except asyncio.TimeoutError:
assert "Attempted to fill gap with invalid header" in caplog.text
# Monkey patch the uncle chaindb to effectively make the attacker peer
# switch to the correct chain.
uncle_chaindb.db = chaindb_1000.db
await wait_for_head(
chaindb_with_gaps,
chaindb_1000.get_canonical_block_header_by_number(expected_block_number)
)
else:
raise AssertionError("Succeeded when it was expected to fail")
async def test_header_gap_fill_detects_invalid_attempt(caplog, event_loop,
event_bus,
chaindb_with_gaps,
chaindb_1000,
chaindb_uncle):
client_context = ChainContextFactory(headerdb__db=chaindb_with_gaps.db)
server_context = ChainContextFactory(headerdb__db=chaindb_uncle.db)
peer_pair = LatestETHPeerPairFactory(
alice_peer_context=client_context,
bob_peer_context=server_context,
event_bus=event_bus,
)
async with peer_pair as (client_peer, server_peer):
client_peer_pool = MockPeerPoolWithConnectedPeers([client_peer],
event_bus=event_bus)
client = SequentialHeaderChainGapSyncer(
LatestTestChain(chaindb_with_gaps.db), chaindb_with_gaps,
client_peer_pool)
server_peer_pool = MockPeerPoolWithConnectedPeers([server_peer],
event_bus=event_bus)
uncle_chaindb = AsyncChainDB(chaindb_uncle.db)
async with run_peer_pool_event_server(
event_bus, server_peer_pool,
handler_type=ETHPeerPoolEventServer
), background_asyncio_service(
ETHRequestServer(
event_bus,
TO_NETWORKING_BROADCAST_CONFIG,
uncle_chaindb,
)):
server_peer.logger.info("%s is serving 1000 blocks", server_peer)
client_peer.logger.info("%s is syncing up 1000", client_peer)
# We check for 499 because 500 exists from the very beginning (the checkpoint)
expected_block_number = 499
final_header = chaindb_1000.get_canonical_block_header_by_number(
expected_block_number)
async with background_asyncio_service(client):
try:
await wait_for_head(
chaindb_with_gaps,
final_header,
sync_timeout=5,
)
except asyncio.TimeoutError:
assert "Attempted to fill gap with invalid header" in caplog.text
# Monkey patch the uncle chaindb to effectively make the attacker peer
# switch to the correct chain.
uncle_chaindb.db = chaindb_1000.db
# The hack goes on: Now that our attacker peer turned friendly we may be stuck
# waiting for a new skeleton peer forever. This isn't a real life scenario
# because: a.) an attacker probably won't turn friendly and b.) new blocks and
# peers will constantly yield new skeleton peers.
# This ugly hack will tick the chain tip monitor as we simulate a joining peer.
for subscriber in client_peer_pool._subscribers:
subscriber.register_peer(client_peer)
await wait_for_head(
chaindb_with_gaps,
final_header,
sync_timeout=20,
)
else:
raise AssertionError(
"Succeeded when it was expected to fail")