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Fix discovery of base of reorgs

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This commit is contained in:
Neil Booth 2017-03-21 22:16:19 +09:00
parent 5f56689e9c
commit 294212d421
1 changed files with 8 additions and 6 deletions
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14
server/block_processor.py
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@ -291,11 +291,13 @@ class BlockProcessor(server.db.DB):
The hashes are returned in order of increasing height.'''
def match_pos(hashes1, hashes2):
def diff_pos(hashes1, hashes2):
'''Returns the index of the first difference in the hash lists.
If both lists match returns their length.'''
for n, (hash1, hash2) in enumerate(zip(hashes1, hashes2)):
if hash1 == hash2:
if hash1 != hash2:
return n
return -1
return len(hashes)
if count is None:
# A real reorg
@ -305,9 +307,9 @@ class BlockProcessor(server.db.DB):
hashes = self.fs_block_hashes(start, count)
hex_hashes = [hash_to_str(hash) for hash in hashes]
d_hex_hashes = await self.daemon.block_hex_hashes(start, count)
n = match_pos(hex_hashes, d_hex_hashes)
if n >= 0:
start += n + 1
n = diff_pos(hex_hashes, d_hex_hashes)
if n > 0:
start += n
break
count = min(count * 2, start)
start -= count