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blockchain: check best chain on disk is consistent with checkpoints

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had a corrupted mainnet datadir that had testnet blockchain_headers file
(I had probably corrupted it myself but electrum could not recover from it)
This commit is contained in:
SomberNight 2018-11-30 16:36:37 +01:00
parent 2484c52611
commit 73e2b09ba8
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GPG key ID: B33B5F232C6271E9
1 changed files with 18 additions and 9 deletions
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27
electrum/blockchain.py
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@ -86,11 +86,20 @@ blockchains_lock = threading.RLock()
def read_blockchains(config: 'SimpleConfig'): def read_blockchains(config: 'SimpleConfig'):
blockchains[constants.net.GENESIS] = Blockchain(config=config, best_chain = Blockchain(config=config,
forkpoint=0, forkpoint=0,
parent=None, parent=None,
forkpoint_hash=constants.net.GENESIS, forkpoint_hash=constants.net.GENESIS,
prev_hash=None) prev_hash=None)
blockchains[constants.net.GENESIS] = best_chain
# consistency checks
if best_chain.height() > constants.net.max_checkpoint():
header_after_cp = best_chain.read_header(constants.net.max_checkpoint()+1)
if not header_after_cp or not best_chain.can_connect(header_after_cp, check_height=False):
util.print_error("[blockchain] deleting best chain. cannot connect header after last cp to last cp.")
os.unlink(best_chain.path())
best_chain.update_size()
# forks
fdir = os.path.join(util.get_headers_dir(config), 'forks') fdir = os.path.join(util.get_headers_dir(config), 'forks')
util.make_dir(fdir) util.make_dir(fdir)
# files are named as: fork2_{forkpoint}_{prev_hash}_{first_hash} # files are named as: fork2_{forkpoint}_{prev_hash}_{first_hash}
@ -98,7 +107,7 @@ def read_blockchains(config: 'SimpleConfig'):
l = sorted(l, key=lambda x: int(x.split('_')[1])) # sort by forkpoint l = sorted(l, key=lambda x: int(x.split('_')[1])) # sort by forkpoint
def delete_chain(filename, reason): def delete_chain(filename, reason):
util.print_error("[blockchain]", reason, filename) util.print_error(f"[blockchain] deleting chain {filename}: {reason}")
os.unlink(os.path.join(fdir, filename)) os.unlink(os.path.join(fdir, filename))
def instantiate_chain(filename): def instantiate_chain(filename):
@ -222,10 +231,10 @@ class Blockchain(util.PrintError):
prev_hash=parent.get_hash(forkpoint-1)) prev_hash=parent.get_hash(forkpoint-1))
open(self.path(), 'w+').close() open(self.path(), 'w+').close()
self.save_header(header) self.save_header(header)
# put into global dict # put into global dict. note that in some cases
# save_header might have already put it there but that's OK
chain_id = self.get_id() chain_id = self.get_id()
with blockchains_lock: with blockchains_lock:
assert chain_id not in blockchains, (chain_id, list(blockchains))
blockchains[chain_id] = self blockchains[chain_id] = self
return self return self
@ -392,7 +401,7 @@ class Blockchain(util.PrintError):
delta = header.get('block_height') - self.forkpoint delta = header.get('block_height') - self.forkpoint
data = bfh(serialize_header(header)) data = bfh(serialize_header(header))
# headers are only _appended_ to the end: # headers are only _appended_ to the end:
assert delta == self.size() assert delta == self.size(), (delta, self.size())
assert len(data) == HEADER_SIZE assert len(data) == HEADER_SIZE
self.write(data, delta*HEADER_SIZE) self.write(data, delta*HEADER_SIZE)
self.swap_with_parent() self.swap_with_parent()