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Differential D7844

nodemap: code to parse the persistent binary nodemap data
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Authored by marmoute on Jan 13 2020, 10:07 AM.

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Group Reviewers
hg-reviewers
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rHG78721bbdb2ab: nodemap: code to parse the persistent binary nodemap data
Summary

We now have code to read back what we persisted. This will be put to use in
later changesets.

Diff Detail

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rHG Mercurial
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Unit Tests Skipped

Event Timeline

marmoute created this revision.Jan 13 2020, 10:07 AM
marmoute updated this revision to Diff 19298.Jan 15 2020, 9:54 AM
marmoute retitled this revision from nodemap: code to parse a serialized nodemap to nodemap: code to parse the persistent binary nodemap data.Jan 31 2020, 10:28 AM
marmoute edited the summary of this revision. (Show Details)
marmoute updated this revision to Diff 19760.
marmoute updated this revision to Diff 19789.Jan 31 2020, 5:59 PM
marmoute updated this revision to Diff 19833.Feb 2 2020, 3:18 AM

small doc update on .#s[1]

marmoute updated this revision to Diff 19892.Feb 4 2020, 7:24 PM

rebase to latest default

marmoute added a commit: rHG78721bbdb2ab: nodemap: code to parse the persistent binary nodemap data.Feb 10 2020, 8:25 PM
This revision was not accepted when it landed; it landed in state Needs Review.
Closed by commit rHG78721bbdb2ab: nodemap: code to parse the persistent binary nodemap data (authored by marmoute). · Explain Why
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

PathPackages
Mmercurial/revlogutils/nodemap.py (30 lines)

Diff 19833

mercurial/revlogutils/nodemap.py

def _to_value(item, block_map): def _to_value(item, block_map):
"""persist any value as an integer""" """persist any value as an integer"""
if item is None: if item is None:
return NO_ENTRY return NO_ENTRY
elif isinstance(item, dict): elif isinstance(item, dict):
return block_map[id(item)] return block_map[id(item)]
else: else:
return _transform_rev(item) return _transform_rev(item)
def parse_data(data):
"""parse parse nodemap data into a nodemap Trie"""
if (len(data) % S_BLOCK.size) != 0:
msg = "nodemap data size is not a multiple of block size (%d): %d"
raise error.Abort(msg % (S_BLOCK.size, len(data)))
if not data:
return Block()
block_map = {}
for i in range(0, len(data), S_BLOCK.size):
block = _parse_block(block_map, data[i : i + S_BLOCK.size])
return block
def _parse_block(block_map, block_data):
"""Parse the persisted version of an individual block
"""
block = Block()
ondisk_id = len(block_map)
block_map[ondisk_id] = block
values = S_BLOCK.unpack(block_data)
for idx, v in enumerate(values):
if v == NO_ENTRY:
continue
elif v >= 0:
block[idx] = block_map[v]
else:
block[idx] = _transform_rev(v)
return block