605 lines
25 KiB
Python
Executable file
605 lines
25 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2014-2016 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, two p2p connections to node0. One p2p connection should only ever
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receive inv's (omitted from testing description below, this is our control).
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Second node is used for creating reorgs.
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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.mininode import *
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import *
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from test_framework.blocktools import create_block, create_coinbase
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direct_fetch_response_time = 0.05
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class BaseNode(SingleNodeConnCB):
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def __init__(self):
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SingleNodeConnCB.__init__(self)
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self.last_inv = None
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self.last_headers = None
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self.last_block = None
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self.last_getdata = None
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self.block_announced = False
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self.last_getheaders = None
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self.disconnected = False
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self.last_blockhash_announced = None
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def clear_last_announcement(self):
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with mininode_lock:
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self.block_announced = False
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self.last_inv = None
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self.last_headers = None
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# Request data for a list of block hashes
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def get_data(self, 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.connection.send_message(msg)
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def 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.connection.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.connection.send_message(msg)
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def on_inv(self, conn, message):
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self.last_inv = 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, conn, message):
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self.last_headers = message
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if len(message.headers):
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self.block_announced = True
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message.headers[-1].calc_sha256()
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self.last_blockhash_announced = message.headers[-1].sha256
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def on_block(self, conn, message):
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self.last_block = message.block
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self.last_block.calc_sha256()
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def on_getdata(self, conn, message):
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self.last_getdata = message
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def on_getheaders(self, conn, message):
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self.last_getheaders = message
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def on_close(self, conn):
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self.disconnected = True
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# Test whether the last announcement we received had the
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# right header or the right inv
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# inv and headers should be lists of block hashes
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def check_last_announcement(self, headers=None, inv=None):
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expect_headers = headers if headers != None else []
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expect_inv = inv if inv != None else []
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test_function = lambda: self.block_announced
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assert(wait_until(test_function, timeout=60))
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with mininode_lock:
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self.block_announced = False
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success = True
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compare_inv = []
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if self.last_inv != None:
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compare_inv = [x.hash for x in self.last_inv.inv]
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if compare_inv != expect_inv:
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success = False
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hash_headers = []
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if self.last_headers != None:
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# treat headers as a list of block hashes
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hash_headers = [ x.sha256 for x in self.last_headers.headers ]
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if hash_headers != expect_headers:
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success = False
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self.last_inv = None
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self.last_headers = None
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return success
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# Syncing helpers
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def wait_for_block(self, blockhash, timeout=60):
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test_function = lambda: self.last_block != None and self.last_block.sha256 == blockhash
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assert(wait_until(test_function, timeout=timeout))
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return
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def wait_for_getheaders(self, timeout=60):
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test_function = lambda: self.last_getheaders != None
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assert(wait_until(test_function, timeout=timeout))
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return
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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: self.last_getdata != None and [x.hash for x in self.last_getdata.inv] == hash_list
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assert(wait_until(test_function, timeout=timeout))
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return
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def wait_for_disconnect(self, timeout=60):
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test_function = lambda: self.disconnected
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assert(wait_until(test_function, timeout=timeout))
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return
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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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assert(wait_until(test_function, timeout=timeout))
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return
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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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# InvNode: This peer should only ever receive inv's, because it doesn't ever send a
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# "sendheaders" message.
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class InvNode(BaseNode):
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def __init__(self):
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BaseNode.__init__(self)
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# TestNode: This peer is the one we use for most of the testing.
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class TestNode(BaseNode):
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def __init__(self):
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BaseNode.__init__(self)
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class SendHeadersTest(BitcoinTestFramework):
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def __init__(self):
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super().__init__()
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self.setup_clean_chain = True
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self.num_nodes = 2
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def setup_network(self):
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self.nodes = []
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self.nodes = start_nodes(self.num_nodes, self.options.tmpdir)
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connect_nodes(self.nodes[0], 1)
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# mine count blocks and return the new tip
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def mine_blocks(self, count):
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# Clear out last block announcement from each p2p listener
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[ x.clear_last_announcement() for x in self.p2p_connections ]
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self.nodes[0].generate(count)
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return int(self.nodes[0].getbestblockhash(), 16)
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# mine a reorg that invalidates length blocks (replacing them with
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# 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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def mine_reorg(self, length):
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self.nodes[0].generate(length) # make sure all invalidated blocks are node0's
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sync_blocks(self.nodes, wait=0.1)
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for x in self.p2p_connections:
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x.wait_for_block_announcement(int(self.nodes[0].getbestblockhash(), 16))
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x.clear_last_announcement()
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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].generate(length+1) # Must be longer than the orig chain
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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 and start up the network thread.
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inv_node = InvNode()
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test_node = TestNode()
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self.p2p_connections = [inv_node, test_node]
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connections = []
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], inv_node))
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# Set nServices to 0 for test_node, so no block download will occur outside of
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# direct fetching
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connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], test_node, services=0))
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inv_node.add_connection(connections[0])
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test_node.add_connection(connections[1])
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NetworkThread().start() # Start up network handling in another thread
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# Test logic begins here
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inv_node.wait_for_verack()
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test_node.wait_for_verack()
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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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old_tip = tip
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tip = self.mine_blocks(1)
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(inv=[tip]), True)
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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.get_data([tip])
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test_node.wait_for_block(tip, timeout=5)
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elif i == 1:
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# next try requesting header and block
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test_node.get_headers(locator=[old_tip], hashstop=tip)
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test_node.get_data([tip])
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test_node.wait_for_block(tip)
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test_node.clear_last_announcement() # 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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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], timeout=5)
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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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inv_node.clear_last_announcement()
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test_node.clear_last_announcement()
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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.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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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(headers=[tip]), True)
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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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# 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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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(timeout=5)
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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], timeout=5)
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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], timeout=5)
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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_equal(inv_node.last_inv, None)
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assert_equal(inv_node.last_headers, None)
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tip = self.mine_blocks(1)
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(headers=[tip]), True)
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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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# 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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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(headers=new_block_hashes), True)
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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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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(inv=[tip]), True)
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block_time += 9
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fork_point = self.nodes[0].getblock("%02x" % 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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assert_equal(test_node.check_last_announcement(inv=new_block_hashes), True)
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test_node.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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# Mine another block, still should get only an inv
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tip = self.mine_blocks(1)
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(inv=[tip]), True)
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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.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.get_headers(locator=[fork_point], hashstop=new_block_hashes[1])
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test_node.get_data([tip])
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test_node.wait_for_block(tip)
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elif i == 2:
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test_node.get_data([tip])
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test_node.wait_for_block(tip)
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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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if j == 0:
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test_node.get_headers(locator=[tip], hashstop=0)
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test_node.sync_with_ping()
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else:
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test_node.send_block_inv(tip)
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test_node.sync_with_ping()
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# New blocks should now be announced with header
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tip = self.mine_blocks(1)
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assert_equal(inv_node.check_last_announcement(inv=[tip]), True)
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assert_equal(test_node.check_last_announcement(headers=[tip]), True)
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self.log.info("Part 3: success!")
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self.log.info("Part 4: Testing direct fetch behavior...")
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tip = self.mine_blocks(1)
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height = self.nodes[0].getblockcount() + 1
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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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# Create 2 blocks. Send the blocks, then send the headers.
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blocks = []
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for b in range(2):
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blocks.append(create_block(tip, create_coinbase(height), block_time))
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|
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_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_equal(test_node.last_getdata, None)
|
|
|
|
# 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 -= 1
|
|
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_getdata = None
|
|
test_node.send_header_for_blocks(blocks[0:1])
|
|
test_node.sync_with_ping()
|
|
with mininode_lock:
|
|
assert_equal(test_node.last_getdata, None)
|
|
|
|
# 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_getdata = None
|
|
test_node.send_header_for_blocks(blocks[18:19])
|
|
test_node.sync_with_ping()
|
|
with mininode_lock:
|
|
assert_equal(test_node.last_getdata, None)
|
|
|
|
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):
|
|
test_node.last_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_getheaders = None
|
|
test_node.send_header_for_blocks([blocks[1]])
|
|
test_node.wait_for_getheaders(timeout=1)
|
|
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_getheaders = None
|
|
test_node.send_header_for_blocks([blocks[i]])
|
|
test_node.wait_for_getheaders(timeout=1)
|
|
|
|
# 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_getheaders = None
|
|
test_node.send_header_for_blocks([blocks[i%len(blocks)]])
|
|
test_node.wait_for_getheaders(timeout=1)
|
|
|
|
# Eventually this stops working.
|
|
with mininode_lock:
|
|
self.last_getheaders = None
|
|
test_node.send_header_for_blocks([blocks[-1]])
|
|
|
|
# Should get disconnected
|
|
test_node.wait_for_disconnect()
|
|
with mininode_lock:
|
|
self.last_getheaders = True
|
|
|
|
self.log.info("Part 5: success!")
|
|
|
|
# Finally, check that the inv node never received a getdata request,
|
|
# throughout the test
|
|
assert_equal(inv_node.last_getdata, None)
|
|
|
|
if __name__ == '__main__':
|
|
SendHeadersTest().main()
|