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download: log more information when hashtree checks fail

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This commit is contained in:
Brian Warner 2007-04-16 13:08:19 -07:00
parent 7dabb68a51
commit 2fef5dac1f
1 changed files with 23 additions and 12 deletions
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35
src/allmydata/download.py
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@ -85,19 +85,30 @@ class ValidatedBucket:
def _got_data(self, res, blocknum):
sharehashes, blockhashes, blockdata = res
if not self._share_hash:
sh = dict(sharehashes)
sh[0] = self._roothash # always use our own root, from the URI
if self.share_hash_tree.get_leaf_index(self.sharenum) not in sh:
raise hashutil.NotEnoughHashesError
self.share_hash_tree.set_hashes(sh)
self._share_hash = self.share_hash_tree.get_leaf(self.sharenum)
try:
if not self._share_hash:
sh = dict(sharehashes)
sh[0] = self._roothash # always use our own root, from the URI
sht = self.share_hash_tree
if sht.get_leaf_index(self.sharenum) not in sh:
raise hashutil.NotEnoughHashesError
sht.set_hashes(sh)
self._share_hash = sht.get_leaf(self.sharenum)
blockhash = hashutil.tagged_hash("encoded subshare", blockdata)
# we always validate the blockhash
bh = dict(enumerate(blockhashes))
# replace blockhash root with validated value
bh[0] = self._share_hash
self.block_hash_tree.set_hashes(bh, {blocknum: blockhash})
except (hashutil.BadHashError, hashutil.NotEnoughHashesError):
# log.WEIRD: indicates undetected disk/network error, or more
# likely a programming error
log.msg("hash failure in shnum=%d on %s" % (self.sharenum,
self.bucket))
raise
blockhash = hashutil.tagged_hash("encoded subshare", blockdata)
# we always validate the blockhash
bh = dict(enumerate(blockhashes))
bh[0] = self._share_hash # replace blockhash root with validated value
self.block_hash_tree.set_hashes(bh, {blocknum: blockhash})
# If we made it here, the block is good. If the hash trees didn't
# like what they saw, they would have raised a BadHashError, causing
# our caller to see a Failure and thus ignore this block (as well as