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607 lines
26 KiB
607 lines
26 KiB
#!/usr/bin/env python3
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# Copyright (c) 2014-2019 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test behavior of headers messages to announce blocks.
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Setup:
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- Two nodes:
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- node0 is the node-under-test. We create two p2p connections to it. The
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first p2p connection is a control and should only ever receive inv's. The
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second p2p connection tests the headers sending logic.
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- node1 is used to create reorgs.
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test_null_locators
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==================
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Sends two getheaders requests with null locator values. First request's hashstop
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value refers to validated block, while second request's hashstop value refers to
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a block which hasn't been validated. Verifies only the first request returns
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headers.
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test_nonnull_locators
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=====================
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Part 1: No headers announcements before "sendheaders"
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a. node mines a block [expect: inv]
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send getdata for the block [expect: block]
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b. node mines another block [expect: inv]
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send getheaders and getdata [expect: headers, then block]
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c. node mines another block [expect: inv]
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peer mines a block, announces with header [expect: getdata]
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d. node mines another block [expect: inv]
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Part 2: After "sendheaders", headers announcements should generally work.
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a. peer sends sendheaders [expect: no response]
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peer sends getheaders with current tip [expect: no response]
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b. node mines a block [expect: tip header]
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c. for N in 1, ..., 10:
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* for announce-type in {inv, header}
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- peer mines N blocks, announces with announce-type
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[ expect: getheaders/getdata or getdata, deliver block(s) ]
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- node mines a block [ expect: 1 header ]
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Part 3: Headers announcements stop after large reorg and resume after getheaders or inv from peer.
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- For response-type in {inv, getheaders}
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* node mines a 7 block reorg [ expect: headers announcement of 8 blocks ]
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* node mines an 8-block reorg [ expect: inv at tip ]
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* peer responds with getblocks/getdata [expect: inv, blocks ]
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* node mines another block [ expect: inv at tip, peer sends getdata, expect: block ]
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* node mines another block at tip [ expect: inv ]
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* peer responds with getheaders with an old hashstop more than 8 blocks back [expect: headers]
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* peer requests block [ expect: block ]
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* node mines another block at tip [ expect: inv, peer sends getdata, expect: block ]
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* peer sends response-type [expect headers if getheaders, getheaders/getdata if mining new block]
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* node mines 1 block [expect: 1 header, peer responds with getdata]
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Part 4: Test direct fetch behavior
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a. Announce 2 old block headers.
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Expect: no getdata requests.
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b. Announce 3 new blocks via 1 headers message.
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Expect: one getdata request for all 3 blocks.
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(Send blocks.)
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c. Announce 1 header that forks off the last two blocks.
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Expect: no response.
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d. Announce 1 more header that builds on that fork.
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Expect: one getdata request for two blocks.
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e. Announce 16 more headers that build on that fork.
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Expect: getdata request for 14 more blocks.
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f. Announce 1 more header that builds on that fork.
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Expect: no response.
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Part 5: Test handling of headers that don't connect.
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a. Repeat 10 times:
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1. Announce a header that doesn't connect.
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Expect: getheaders message
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2. Send headers chain.
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Expect: getdata for the missing blocks, tip update.
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b. Then send 9 more headers that don't connect.
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Expect: getheaders message each time.
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c. Announce a header that does connect.
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Expect: no response.
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d. Announce 49 headers that don't connect.
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Expect: getheaders message each time.
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e. Announce one more that doesn't connect.
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Expect: disconnect.
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"""
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from test_framework.blocktools import create_block, create_coinbase
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from test_framework.messages import CInv
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from test_framework.mininode import (
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CBlockHeader,
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NODE_WITNESS,
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P2PInterface,
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mininode_lock,
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msg_block,
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msg_getblocks,
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msg_getdata,
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msg_getheaders,
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msg_headers,
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msg_inv,
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msg_sendheaders,
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)
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import (
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assert_equal,
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wait_until,
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)
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DIRECT_FETCH_RESPONSE_TIME = 0.05
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class BaseNode(P2PInterface):
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def __init__(self):
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super().__init__()
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self.block_announced = False
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self.last_blockhash_announced = None
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self.recent_headers_announced = []
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def send_get_data(self, block_hashes):
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"""Request data for a list of block hashes."""
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msg = msg_getdata()
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for x in block_hashes:
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msg.inv.append(CInv(2, x))
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self.send_message(msg)
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def send_get_headers(self, locator, hashstop):
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msg = msg_getheaders()
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msg.locator.vHave = locator
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msg.hashstop = hashstop
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self.send_message(msg)
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def send_block_inv(self, blockhash):
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msg = msg_inv()
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msg.inv = [CInv(2, blockhash)]
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self.send_message(msg)
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def send_header_for_blocks(self, new_blocks):
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headers_message = msg_headers()
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headers_message.headers = [CBlockHeader(b) for b in new_blocks]
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self.send_message(headers_message)
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def send_getblocks(self, locator):
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getblocks_message = msg_getblocks()
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getblocks_message.locator.vHave = locator
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self.send_message(getblocks_message)
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def wait_for_getdata(self, hash_list, timeout=60):
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if hash_list == []:
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return
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test_function = lambda: "getdata" in self.last_message and [x.hash for x in self.last_message["getdata"].inv] == hash_list
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def wait_for_block_announcement(self, block_hash, timeout=60):
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test_function = lambda: self.last_blockhash_announced == block_hash
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wait_until(test_function, timeout=timeout, lock=mininode_lock)
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def on_inv(self, message):
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self.block_announced = True
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self.last_blockhash_announced = message.inv[-1].hash
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def on_headers(self, message):
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if len(message.headers):
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self.block_announced = True
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for x in message.headers:
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x.calc_sha256()
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# append because headers may be announced over multiple messages.
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self.recent_headers_announced.append(x.sha256)
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self.last_blockhash_announced = message.headers[-1].sha256
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def clear_block_announcements(self):
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with mininode_lock:
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self.block_announced = False
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self.last_message.pop("inv", None)
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self.last_message.pop("headers", None)
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self.recent_headers_announced = []
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def check_last_headers_announcement(self, headers):
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"""Test whether the last headers announcements received are right.
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Headers may be announced across more than one message."""
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test_function = lambda: (len(self.recent_headers_announced) >= len(headers))
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wait_until(test_function, timeout=60, lock=mininode_lock)
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with mininode_lock:
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assert_equal(self.recent_headers_announced, headers)
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self.block_announced = False
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self.last_message.pop("headers", None)
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self.recent_headers_announced = []
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def check_last_inv_announcement(self, inv):
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"""Test whether the last announcement received had the right inv.
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inv should be a list of block hashes."""
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test_function = lambda: self.block_announced
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wait_until(test_function, timeout=60, lock=mininode_lock)
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with mininode_lock:
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compare_inv = []
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if "inv" in self.last_message:
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compare_inv = [x.hash for x in self.last_message["inv"].inv]
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assert_equal(compare_inv, inv)
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self.block_announced = False
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self.last_message.pop("inv", None)
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class SendHeadersTest(BitcoinTestFramework):
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def set_test_params(self):
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self.setup_clean_chain = True
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self.num_nodes = 2
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def mine_blocks(self, count):
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"""Mine count blocks and return the new tip."""
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# Clear out block announcements from each p2p listener
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[x.clear_block_announcements() for x in self.nodes[0].p2ps]
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self.nodes[0].generatetoaddress(count, self.nodes[0].get_deterministic_priv_key().address)
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return int(self.nodes[0].getbestblockhash(), 16)
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def mine_reorg(self, length):
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"""Mine a reorg that invalidates length blocks (replacing them with # length+1 blocks).
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Note: we clear the state of our p2p connections after the
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to-be-reorged-out blocks are mined, so that we don't break later tests.
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return the list of block hashes newly mined."""
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# make sure all invalidated blocks are node0's
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self.nodes[0].generatetoaddress(length, self.nodes[0].get_deterministic_priv_key().address)
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self.sync_blocks(self.nodes, wait=0.1)
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for x in self.nodes[0].p2ps:
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x.wait_for_block_announcement(int(self.nodes[0].getbestblockhash(), 16))
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x.clear_block_announcements()
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tip_height = self.nodes[1].getblockcount()
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hash_to_invalidate = self.nodes[1].getblockhash(tip_height - (length - 1))
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self.nodes[1].invalidateblock(hash_to_invalidate)
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all_hashes = self.nodes[1].generatetoaddress(length + 1, self.nodes[1].get_deterministic_priv_key().address) # Must be longer than the orig chain
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self.sync_blocks(self.nodes, wait=0.1)
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return [int(x, 16) for x in all_hashes]
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def run_test(self):
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# Setup the p2p connections
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inv_node = self.nodes[0].add_p2p_connection(BaseNode())
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# Make sure NODE_NETWORK is not set for test_node, so no block download
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# will occur outside of direct fetching
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test_node = self.nodes[0].add_p2p_connection(BaseNode(), services=NODE_WITNESS)
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# Ensure verack's have been processed by our peer
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inv_node.sync_with_ping()
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test_node.sync_with_ping()
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self.test_null_locators(test_node, inv_node)
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self.test_nonnull_locators(test_node, inv_node)
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def test_null_locators(self, test_node, inv_node):
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tip = self.nodes[0].getblockheader(self.nodes[0].generatetoaddress(1, self.nodes[0].get_deterministic_priv_key().address)[0])
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tip_hash = int(tip["hash"], 16)
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inv_node.check_last_inv_announcement(inv=[tip_hash])
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test_node.check_last_inv_announcement(inv=[tip_hash])
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self.log.info("Verify getheaders with null locator and valid hashstop returns headers.")
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test_node.clear_block_announcements()
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test_node.send_get_headers(locator=[], hashstop=tip_hash)
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test_node.check_last_headers_announcement(headers=[tip_hash])
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self.log.info("Verify getheaders with null locator and invalid hashstop does not return headers.")
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block = create_block(int(tip["hash"], 16), create_coinbase(tip["height"] + 1), tip["mediantime"] + 1)
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block.solve()
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test_node.send_header_for_blocks([block])
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test_node.clear_block_announcements()
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test_node.send_get_headers(locator=[], hashstop=int(block.hash, 16))
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test_node.sync_with_ping()
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assert_equal(test_node.block_announced, False)
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inv_node.clear_block_announcements()
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test_node.send_message(msg_block(block))
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inv_node.check_last_inv_announcement(inv=[int(block.hash, 16)])
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def test_nonnull_locators(self, test_node, inv_node):
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tip = int(self.nodes[0].getbestblockhash(), 16)
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# PART 1
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# 1. Mine a block; expect inv announcements each time
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self.log.info("Part 1: headers don't start before sendheaders message...")
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for i in range(4):
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self.log.debug("Part 1.{}: starting...".format(i))
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old_tip = tip
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tip = self.mine_blocks(1)
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_inv_announcement(inv=[tip])
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# Try a few different responses; none should affect next announcement
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if i == 0:
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# first request the block
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test_node.send_get_data([tip])
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test_node.wait_for_block(tip)
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elif i == 1:
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# next try requesting header and block
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test_node.send_get_headers(locator=[old_tip], hashstop=tip)
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test_node.send_get_data([tip])
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test_node.wait_for_block(tip)
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test_node.clear_block_announcements() # since we requested headers...
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elif i == 2:
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# this time announce own block via headers
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inv_node.clear_block_announcements()
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height = self.nodes[0].getblockcount()
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last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time']
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block_time = last_time + 1
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new_block = create_block(tip, create_coinbase(height + 1), block_time)
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new_block.solve()
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test_node.send_header_for_blocks([new_block])
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test_node.wait_for_getdata([new_block.sha256])
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test_node.send_message(msg_block(new_block))
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test_node.sync_with_ping() # make sure this block is processed
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wait_until(lambda: inv_node.block_announced, timeout=60, lock=mininode_lock)
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inv_node.clear_block_announcements()
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test_node.clear_block_announcements()
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self.log.info("Part 1: success!")
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self.log.info("Part 2: announce blocks with headers after sendheaders message...")
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# PART 2
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# 2. Send a sendheaders message and test that headers announcements
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# commence and keep working.
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test_node.send_message(msg_sendheaders())
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prev_tip = int(self.nodes[0].getbestblockhash(), 16)
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test_node.send_get_headers(locator=[prev_tip], hashstop=0)
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test_node.sync_with_ping()
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# Now that we've synced headers, headers announcements should work
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tip = self.mine_blocks(1)
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_headers_announcement(headers=[tip])
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height = self.nodes[0].getblockcount() + 1
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block_time += 10 # Advance far enough ahead
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for i in range(10):
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self.log.debug("Part 2.{}: starting...".format(i))
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# Mine i blocks, and alternate announcing either via
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# inv (of tip) or via headers. After each, new blocks
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# mined by the node should successfully be announced
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# with block header, even though the blocks are never requested
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for j in range(2):
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self.log.debug("Part 2.{}.{}: starting...".format(i, j))
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blocks = []
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for b in range(i + 1):
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blocks.append(create_block(tip, create_coinbase(height), block_time))
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blocks[-1].solve()
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tip = blocks[-1].sha256
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block_time += 1
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height += 1
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if j == 0:
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# Announce via inv
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test_node.send_block_inv(tip)
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test_node.wait_for_getheaders()
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# Should have received a getheaders now
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test_node.send_header_for_blocks(blocks)
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# Test that duplicate inv's won't result in duplicate
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# getdata requests, or duplicate headers announcements
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[inv_node.send_block_inv(x.sha256) for x in blocks]
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test_node.wait_for_getdata([x.sha256 for x in blocks])
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inv_node.sync_with_ping()
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else:
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# Announce via headers
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test_node.send_header_for_blocks(blocks)
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test_node.wait_for_getdata([x.sha256 for x in blocks])
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# Test that duplicate headers won't result in duplicate
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# getdata requests (the check is further down)
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inv_node.send_header_for_blocks(blocks)
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inv_node.sync_with_ping()
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[test_node.send_message(msg_block(x)) for x in blocks]
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test_node.sync_with_ping()
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inv_node.sync_with_ping()
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# This block should not be announced to the inv node (since it also
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# broadcast it)
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assert "inv" not in inv_node.last_message
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assert "headers" not in inv_node.last_message
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tip = self.mine_blocks(1)
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_headers_announcement(headers=[tip])
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height += 1
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block_time += 1
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self.log.info("Part 2: success!")
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self.log.info("Part 3: headers announcements can stop after large reorg, and resume after headers/inv from peer...")
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# PART 3. Headers announcements can stop after large reorg, and resume after
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# getheaders or inv from peer.
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for j in range(2):
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self.log.debug("Part 3.{}: starting...".format(j))
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# First try mining a reorg that can propagate with header announcement
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new_block_hashes = self.mine_reorg(length=7)
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tip = new_block_hashes[-1]
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_headers_announcement(headers=new_block_hashes)
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block_time += 8
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# Mine a too-large reorg, which should be announced with a single inv
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new_block_hashes = self.mine_reorg(length=8)
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tip = new_block_hashes[-1]
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_inv_announcement(inv=[tip])
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block_time += 9
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fork_point = self.nodes[0].getblock("%064x" % new_block_hashes[0])["previousblockhash"]
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fork_point = int(fork_point, 16)
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# Use getblocks/getdata
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test_node.send_getblocks(locator=[fork_point])
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test_node.check_last_inv_announcement(inv=new_block_hashes)
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test_node.send_get_data(new_block_hashes)
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test_node.wait_for_block(new_block_hashes[-1])
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for i in range(3):
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self.log.debug("Part 3.{}.{}: starting...".format(j, i))
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# Mine another block, still should get only an inv
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tip = self.mine_blocks(1)
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inv_node.check_last_inv_announcement(inv=[tip])
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test_node.check_last_inv_announcement(inv=[tip])
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if i == 0:
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# Just get the data -- shouldn't cause headers announcements to resume
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test_node.send_get_data([tip])
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test_node.wait_for_block(tip)
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elif i == 1:
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# Send a getheaders message that shouldn't trigger headers announcements
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# to resume (best header sent will be too old)
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test_node.send_get_headers(locator=[fork_point], hashstop=new_block_hashes[1])
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test_node.send_get_data([tip])
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test_node.wait_for_block(tip)
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elif i == 2:
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# This time, try sending either a getheaders to trigger resumption
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# of headers announcements, or mine a new block and inv it, also
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# triggering resumption of headers announcements.
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test_node.send_get_data([tip])
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test_node.wait_for_block(tip)
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if j == 0:
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test_node.send_get_headers(locator=[tip], hashstop=0)
|
|
test_node.sync_with_ping()
|
|
else:
|
|
test_node.send_block_inv(tip)
|
|
test_node.sync_with_ping()
|
|
# New blocks should now be announced with header
|
|
tip = self.mine_blocks(1)
|
|
inv_node.check_last_inv_announcement(inv=[tip])
|
|
test_node.check_last_headers_announcement(headers=[tip])
|
|
|
|
self.log.info("Part 3: success!")
|
|
|
|
self.log.info("Part 4: Testing direct fetch behavior...")
|
|
tip = self.mine_blocks(1)
|
|
height = self.nodes[0].getblockcount() + 1
|
|
last_time = self.nodes[0].getblock(self.nodes[0].getbestblockhash())['time']
|
|
block_time = last_time + 1
|
|
|
|
# Create 2 blocks. Send the blocks, then send the headers.
|
|
blocks = []
|
|
for b in range(2):
|
|
blocks.append(create_block(tip, create_coinbase(height), block_time))
|
|
blocks[-1].solve()
|
|
tip = blocks[-1].sha256
|
|
block_time += 1
|
|
height += 1
|
|
inv_node.send_message(msg_block(blocks[-1]))
|
|
|
|
inv_node.sync_with_ping() # Make sure blocks are processed
|
|
test_node.last_message.pop("getdata", None)
|
|
test_node.send_header_for_blocks(blocks)
|
|
test_node.sync_with_ping()
|
|
# should not have received any getdata messages
|
|
with mininode_lock:
|
|
assert "getdata" not in test_node.last_message
|
|
|
|
# This time, direct fetch should work
|
|
blocks = []
|
|
for b in range(3):
|
|
blocks.append(create_block(tip, create_coinbase(height), block_time))
|
|
blocks[-1].solve()
|
|
tip = blocks[-1].sha256
|
|
block_time += 1
|
|
height += 1
|
|
|
|
test_node.send_header_for_blocks(blocks)
|
|
test_node.sync_with_ping()
|
|
test_node.wait_for_getdata([x.sha256 for x in blocks], timeout=DIRECT_FETCH_RESPONSE_TIME)
|
|
|
|
[test_node.send_message(msg_block(x)) for x in blocks]
|
|
|
|
test_node.sync_with_ping()
|
|
|
|
# Now announce a header that forks the last two blocks
|
|
tip = blocks[0].sha256
|
|
height -= 2
|
|
blocks = []
|
|
|
|
# Create extra blocks for later
|
|
for b in range(20):
|
|
blocks.append(create_block(tip, create_coinbase(height), block_time))
|
|
blocks[-1].solve()
|
|
tip = blocks[-1].sha256
|
|
block_time += 1
|
|
height += 1
|
|
|
|
# Announcing one block on fork should not trigger direct fetch
|
|
# (less work than tip)
|
|
test_node.last_message.pop("getdata", None)
|
|
test_node.send_header_for_blocks(blocks[0:1])
|
|
test_node.sync_with_ping()
|
|
with mininode_lock:
|
|
assert "getdata" not in test_node.last_message
|
|
|
|
# Announcing one more block on fork should trigger direct fetch for
|
|
# both blocks (same work as tip)
|
|
test_node.send_header_for_blocks(blocks[1:2])
|
|
test_node.sync_with_ping()
|
|
test_node.wait_for_getdata([x.sha256 for x in blocks[0:2]], timeout=DIRECT_FETCH_RESPONSE_TIME)
|
|
|
|
# Announcing 16 more headers should trigger direct fetch for 14 more
|
|
# blocks
|
|
test_node.send_header_for_blocks(blocks[2:18])
|
|
test_node.sync_with_ping()
|
|
test_node.wait_for_getdata([x.sha256 for x in blocks[2:16]], timeout=DIRECT_FETCH_RESPONSE_TIME)
|
|
|
|
# Announcing 1 more header should not trigger any response
|
|
test_node.last_message.pop("getdata", None)
|
|
test_node.send_header_for_blocks(blocks[18:19])
|
|
test_node.sync_with_ping()
|
|
with mininode_lock:
|
|
assert "getdata" not in test_node.last_message
|
|
|
|
self.log.info("Part 4: success!")
|
|
|
|
# Now deliver all those blocks we announced.
|
|
[test_node.send_message(msg_block(x)) for x in blocks]
|
|
|
|
self.log.info("Part 5: Testing handling of unconnecting headers")
|
|
# First we test that receipt of an unconnecting header doesn't prevent
|
|
# chain sync.
|
|
for i in range(10):
|
|
self.log.debug("Part 5.{}: starting...".format(i))
|
|
test_node.last_message.pop("getdata", None)
|
|
blocks = []
|
|
# Create two more blocks.
|
|
for j in range(2):
|
|
blocks.append(create_block(tip, create_coinbase(height), block_time))
|
|
blocks[-1].solve()
|
|
tip = blocks[-1].sha256
|
|
block_time += 1
|
|
height += 1
|
|
# Send the header of the second block -> this won't connect.
|
|
with mininode_lock:
|
|
test_node.last_message.pop("getheaders", None)
|
|
test_node.send_header_for_blocks([blocks[1]])
|
|
test_node.wait_for_getheaders()
|
|
test_node.send_header_for_blocks(blocks)
|
|
test_node.wait_for_getdata([x.sha256 for x in blocks])
|
|
[test_node.send_message(msg_block(x)) for x in blocks]
|
|
test_node.sync_with_ping()
|
|
assert_equal(int(self.nodes[0].getbestblockhash(), 16), blocks[1].sha256)
|
|
|
|
blocks = []
|
|
# Now we test that if we repeatedly don't send connecting headers, we
|
|
# don't go into an infinite loop trying to get them to connect.
|
|
MAX_UNCONNECTING_HEADERS = 10
|
|
for j in range(MAX_UNCONNECTING_HEADERS + 1):
|
|
blocks.append(create_block(tip, create_coinbase(height), block_time))
|
|
blocks[-1].solve()
|
|
tip = blocks[-1].sha256
|
|
block_time += 1
|
|
height += 1
|
|
|
|
for i in range(1, MAX_UNCONNECTING_HEADERS):
|
|
# Send a header that doesn't connect, check that we get a getheaders.
|
|
with mininode_lock:
|
|
test_node.last_message.pop("getheaders", None)
|
|
test_node.send_header_for_blocks([blocks[i]])
|
|
test_node.wait_for_getheaders()
|
|
|
|
# Next header will connect, should re-set our count:
|
|
test_node.send_header_for_blocks([blocks[0]])
|
|
|
|
# Remove the first two entries (blocks[1] would connect):
|
|
blocks = blocks[2:]
|
|
|
|
# Now try to see how many unconnecting headers we can send
|
|
# before we get disconnected. Should be 5*MAX_UNCONNECTING_HEADERS
|
|
for i in range(5 * MAX_UNCONNECTING_HEADERS - 1):
|
|
# Send a header that doesn't connect, check that we get a getheaders.
|
|
with mininode_lock:
|
|
test_node.last_message.pop("getheaders", None)
|
|
test_node.send_header_for_blocks([blocks[i % len(blocks)]])
|
|
test_node.wait_for_getheaders()
|
|
|
|
# Eventually this stops working.
|
|
test_node.send_header_for_blocks([blocks[-1]])
|
|
|
|
# Should get disconnected
|
|
test_node.wait_for_disconnect()
|
|
|
|
self.log.info("Part 5: success!")
|
|
|
|
# Finally, check that the inv node never received a getdata request,
|
|
# throughout the test
|
|
assert "getdata" not in inv_node.last_message
|
|
|
|
if __name__ == '__main__':
|
|
SendHeadersTest().main()
|