def run_test(self):
"""Main test logic"""
# Create P2P connections will wait for a verack to make sure the connection is fully up
peer_messaging = self.nodes[0].add_p2p_connection(BaseNode())
# Generating a block on one of the nodes will get us out of IBD
blocks = [
int(
self.generate(self.nodes[0],
sync_fun=lambda: self.sync_all(self.nodes[0:2]),
nblocks=1)[0], 16)
]
# Notice above how we called an RPC by calling a method with the same
# name on the node object. Notice also how we used a keyword argument
# to specify a named RPC argument. Neither of those are defined on the
# node object. Instead there's some __getattr__() magic going on under
# the covers to dispatch unrecognised attribute calls to the RPC
# interface.
# Logs are nice. Do plenty of them. They can be used in place of comments for
# breaking the test into sub-sections.
self.log.info("Starting test!")
self.log.info("Calling a custom function")
custom_function()
self.log.info("Calling a custom method")
self.custom_method()
self.log.info("Create some blocks")
self.tip = int(self.nodes[0].getbestblockhash(), 16)
self.block_time = self.nodes[0].getblock(
self.nodes[0].getbestblockhash())['time'] + 1
height = self.nodes[0].getblockcount()
for _ in range(10):
# Use the blocktools functionality to manually build a block.
# Calling the generate() rpc is easier, but this allows us to exactly
# control the blocks and transactions.
block = create_block(self.tip, create_coinbase(height + 1),
self.block_time)
block.solve()
block_message = msg_block(block)
# Send message is used to send a P2P message to the node over our P2PInterface
peer_messaging.send_message(block_message)
self.tip = block.sha256
blocks.append(self.tip)
self.block_time += 1
height += 1
self.log.info(
"Wait for node1 to reach current tip (height 11) using RPC")
self.nodes[1].waitforblockheight(11)
self.log.info("Connect node2 and node1")
self.connect_nodes(1, 2)
self.log.info("Wait for node2 to receive all the blocks from node1")
self.sync_all()
self.log.info("Add P2P connection to node2")
self.nodes[0].disconnect_p2ps()
peer_receiving = self.nodes[2].add_p2p_connection(BaseNode())
self.log.info("Test that node2 propagates all the blocks to us")
getdata_request = msg_getdata()
for block in blocks:
getdata_request.inv.append(CInv(MSG_BLOCK, block))
peer_receiving.send_message(getdata_request)
# wait_until() will loop until a predicate condition is met. Use it to test properties of the
# P2PInterface objects.
peer_receiving.wait_until(lambda: sorted(blocks) == sorted(
list(peer_receiving.block_receive_map.keys())),
timeout=5)
self.log.info("Check that each block was received only once")
# The network thread uses a global lock on data access to the P2PConnection objects when sending and receiving
# messages. The test thread should acquire the global lock before accessing any P2PConnection data to avoid locking
# and synchronization issues. Note p2p.wait_until() acquires this global lock internally when testing the predicate.
with p2p_lock:
for block in peer_receiving.block_receive_map.values():
assert_equal(block, 1)
def send_block_request(self, block_hash, node):
msg = msg_getdata()
msg.inv.append(CInv(MSG_BLOCK, block_hash))
node.send_message(msg)
def send_get_data(self, block_hashes):
"""Request data for a list of block hashes."""
msg = msg_getdata()
for x in block_hashes:
msg.inv.append(CInv(MSG_BLOCK, x))
self.send_message(msg)
