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158 lines
4.8 KiB
Python
158 lines
4.8 KiB
Python
# fastmanifest.py
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#
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# Copyright 2016 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""
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This extension adds fastmanifest, a treemanifest disk cache for speeding up
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manifest comparison. It also contains utilities to investigate manifest access
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patterns.
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Configuration options:
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[fastmanifest]
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logfile = "" # Filename, is not empty will log access to any manifest
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"""
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from mercurial import extensions
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from mercurial import manifest
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from mercurial import revset
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from mercurial import util
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class manifestaccesslogger(object):
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"""Class to log manifest access and confirm our assumptions"""
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def __init__(self, logfile):
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self._logfile = logfile
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def revwrap(self, orig, *args, **kwargs):
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"""Wraps manifest.rev and log access"""
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r = orig(*args, **kwargs)
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try:
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with open(self._logfile, "a") as f:
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f.write("%s\n" % r)
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except EnvironmentError as e:
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pass
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return r
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def fastmanifesttocache(repo, subset, x):
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"""Revset of the interesting revisions to cache"""
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return repo.revs("not public()")
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class fastmanifestcache(object):
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"""Cache of fastmanifest"""
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def __contains__(self, key):
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return False
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def __getitem__(self, key):
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return NotImplementedError("not yet available")
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class hybridmanifest(object):
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"""
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Hybrid manifest that behaves like a lazy manifest.
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Initialized with:
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- loadflat a function to load a flat manifest from disk
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- cache an object with mapping method to work with fast manifest from disk
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For the moment, behaves like a lazymanifest since cachedmanifest is not
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yet available.
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"""
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def __init__(self, loadflat, cache=None):
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self.loadflat = loadflat
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self.cache = cache
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@util.propertycache
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def _flatmanifest(self):
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k = self.loadflat()
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assert isinstance(k, manifest.manifestdict), type(k)
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return k
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@util.propertycache
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def _cachedmanifest(self):
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# TODO give the right revision here
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if not self.incache:
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return None
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return self.cache["REVTODO"]
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@util.propertycache
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def _incache(self):
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# TODO give the right revision here
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if not self.cache:
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return None
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return self.cache.__contains__("REVOTODO")
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# Proxy all the manifest methods to the flatmanifest except magic methods
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def __getattr__(self, name):
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return getattr(self._flatmanifest, name)
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# Magic methods should be proxied differently than __getattr__
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# For the moment all methods they all use the _flatmanifest
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def __iter__(self):
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return self._flatmanifest.__iter__()
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def __contains__(self, key):
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return self._flatmanifest.__contains__(key)
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def __getitem__(self, key):
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return self._flatmanifest.__getitem__(key)
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def __setitem__(self, key, val):
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return self._flatmanifest.__setitem__(key, val)
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def __delitem__(self, key):
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return self._flatmanifest.__delitem__(key)
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def __len__(self):
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return self._flatmanifest.__len__()
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def copy(self):
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return hybridmanifest(loadflat=lambda: self._flatmanifest.copy())
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def diff(self, m2, *args, **kwargs):
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# Find _m1 and _m2 of the same type, to provide the fastest computation
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_m1, _m2 = None, None
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if isinstance(m2, hybridmanifest):
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# CACHE HIT
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if self._incache and m2._incache:
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_m1, _m2 = self._cachedmanifestm, m2._cachedmanifest
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# _m1 or _m2 can be None if _incache was True if the cache
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# got garbage collected in the meantime or entry is corrupted
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if not _m1 or not _m2:
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_m1, _m2 = self._flatmanifest, m2._flatmanifest
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# CACHE MISS
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else:
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_m1, _m2 = self._flatmanifest, m2._flatmanifest
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else:
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# This happens when diffing against a new manifest (like rev -1)
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_m1, _m2 = self._flatmanifest, m2
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assert type(_m1) == type(_m2)
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return _m1.diff(_m2, *args, **kwargs)
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class manifestfactory(object):
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def _init__(self):
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pass
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def read(self, orig, *args, **kwargs):
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loadfn = lambda: orig(*args, **kwargs)
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hf = hybridmanifest(loadflat=loadfn)
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return hf
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def extsetup(ui):
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logfile = ui.config("fastmanifest", "logfile", "")
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factory = manifestfactory()
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if logfile:
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logger = manifestaccesslogger(logfile)
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extensions.wrapfunction(manifest.manifest, 'rev', logger.revwrap)
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# Wraps all the function creating a manifestdict
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extensions.wrapfunction(manifest.manifest, '_newmanifest', factory.read)
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revset.symbols['fastmanifesttocache'] = fastmanifesttocache
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revset.safesymbols.add('fastmanifesttocache')
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