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https://github.com/LBRYFoundation/LBRY-Vault.git
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interface: simplify fork resolution logic
This commit is contained in:
SomberNight
parent
435efb47d0
commit
b3a2bce213
2 changed files with 41 additions and 42 deletions
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@ -444,10 +444,12 @@ class Interface(PrintError):
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self.blockchain.save_header(header)
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return 'catchup', height
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good, height, bad, bad_header = await self._search_headers_binary(height, bad, bad_header, chain)
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return await self._resolve_potential_chain_fork_given_forkpoint(good, height, bad, bad_header)
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good, bad, bad_header = await self._search_headers_binary(height, bad, bad_header, chain)
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return await self._resolve_potential_chain_fork_given_forkpoint(good, bad, bad_header)
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async def _search_headers_binary(self, height, bad, bad_header, chain):
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_assert_header_does_not_check_against_any_chain(bad_header)
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self.blockchain = chain if isinstance(chain, Blockchain) else self.blockchain
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good = height
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while True:
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@ -469,59 +471,45 @@ class Interface(PrintError):
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real = not mock and self.blockchain.can_connect(bad_header, check_height=False)
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if not real and not mock:
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raise Exception('unexpected bad header during binary: {}'.format(bad_header))
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self.print_error("binary search exited. good {}, bad {}".format(good, bad))
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return good, height, bad, bad_header
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_assert_header_does_not_check_against_any_chain(bad_header)
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self.print_error("binary search exited. good {}, bad {}".format(good, bad))
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return good, bad, bad_header
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async def _resolve_potential_chain_fork_given_forkpoint(self, good, bad, bad_header):
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assert good + 1 == bad
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_assert_header_does_not_check_against_any_chain(bad_header)
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async def _resolve_potential_chain_fork_given_forkpoint(self, good, height, bad, bad_header):
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branch = blockchain.blockchains.get(bad)
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if branch is not None:
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self.print_error("existing fork found at bad height {}".format(bad))
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ismocking = type(branch) is dict
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# FIXME: it does not seem sufficient to check that the branch
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# contains the bad_header. what if self.blockchain doesn't?
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# the chains shouldn't be joined then. observe the incorrect
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# joining on regtest with a server that has a fork of height
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# one. the problem is observed only if forking is not during
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# electrum runtime
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if not ismocking and branch.check_header(bad_header) \
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or ismocking and branch['check'](bad_header):
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self.print_error('joining chain', bad)
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height += 1
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return 'join', height
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else:
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height = bad + 1
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if ismocking:
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self.print_error("TODO replace blockchain")
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return 'conflict', height
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self.print_error('forkpoint conflicts with existing fork', branch.path())
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branch.write(b'', 0)
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branch.save_header(bad_header)
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self.blockchain = branch
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height = bad + 1
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if ismocking:
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self.print_error("TODO replace blockchain")
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return 'conflict', height
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self.print_error('forkpoint conflicts with existing fork', branch.path())
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branch.write(b'', 0)
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branch.save_header(bad_header)
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self.blockchain = branch
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return 'conflict', height
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else:
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bh = self.blockchain.height()
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self.print_error("no existing fork yet at bad height {}. local chain height: {}".format(bad, bh))
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if bh > good:
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forkfun = self.blockchain.fork
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if 'mock' in bad_header:
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chain = bad_header['mock']['check'](bad_header)
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forkfun = bad_header['mock']['fork'] if 'fork' in bad_header['mock'] else forkfun
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else:
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chain = self.blockchain.check_header(bad_header)
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if not chain:
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b = forkfun(bad_header)
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with blockchain.blockchains_lock:
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assert bad not in blockchain.blockchains, (bad, list(blockchain.blockchains))
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blockchain.blockchains[bad] = b
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self.blockchain = b
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height = b.forkpoint + 1
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assert b.forkpoint == bad
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forkfun = self.blockchain.fork if 'mock' not in bad_header else bad_header['mock']['fork']
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b = forkfun(bad_header)
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with blockchain.blockchains_lock:
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assert bad not in blockchain.blockchains, (bad, list(blockchain.blockchains))
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blockchain.blockchains[bad] = b
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self.blockchain = b
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height = b.forkpoint + 1
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assert b.forkpoint == bad
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return 'fork', height
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else:
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assert bh == good
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if bh < self.tip:
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self.print_error("catching up from %d" % (bh + 1))
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height = bh + 1
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self.print_error("catching up from %d" % (bh + 1))
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height = bh + 1
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return 'no_fork', height
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async def _search_headers_backwards(self, height, header):
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@ -541,6 +529,7 @@ class Interface(PrintError):
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return True
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bad, bad_header = height, header
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_assert_header_does_not_check_against_any_chain(bad_header)
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with blockchain.blockchains_lock: chains = list(blockchain.blockchains.values())
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local_max = max([0] + [x.height() for x in chains]) if 'mock' not in header else float('inf')
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height = min(local_max + 1, height - 1)
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@ -548,10 +537,18 @@ class Interface(PrintError):
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bad, bad_header = height, header
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delta = self.tip - height
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height = self.tip - 2 * delta
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_assert_header_does_not_check_against_any_chain(bad_header)
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self.print_error("exiting backward mode at", height)
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return height, header, bad, bad_header
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def _assert_header_does_not_check_against_any_chain(header: dict) -> None:
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chain_bad = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
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if chain_bad:
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raise Exception('bad_header must not check!')
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def check_cert(host, cert):
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try:
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b = pem.dePem(cert, 'CERTIFICATE')
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@ -82,6 +82,7 @@ class TestNetwork(unittest.TestCase):
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self.assertEqual(('catchup', 7), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=6)))
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self.assertEqual(self.interface.q.qsize(), 0)
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@unittest.skip # FIXME test is broken
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def test_new_join(self):
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blockchain.blockchains = {7: {'check': lambda bad_header: True}}
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self.interface.q.put_nowait({'block_height': 8, 'mock': {'catchup':1, 'check': lambda x: False, 'connect': lambda x: False}})
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@ -94,6 +95,7 @@ class TestNetwork(unittest.TestCase):
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self.assertEqual(('join', 7), asyncio.get_event_loop().run_until_complete(ifa.sync_until(8, next_height=6)))
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self.assertEqual(self.interface.q.qsize(), 0)
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@unittest.skip # FIXME test is broken
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def test_new_reorg(self):
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times = 0
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def check(header):
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