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import threading
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from mercurial.node import (
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hex,
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sha1nodeconstants,
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)
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from mercurial import (
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mdiff,
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revlog,
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)
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from . import (
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basestore,
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constants,
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shallowutil,
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)
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class ChainIndicies:
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"""A static class for easy reference to the delta chain indicies."""
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# The filename of this revision delta
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NAME = 0
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# The mercurial file node for this revision delta
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NODE = 1
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# The filename of the delta base's revision. This is useful when delta
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# between different files (like in the case of a move or copy, we can delta
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# against the original file content).
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BASENAME = 2
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# The mercurial file node for the delta base revision. This is the nullid if
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# this delta is a full text.
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BASENODE = 3
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# The actual delta or full text data.
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DATA = 4
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class unioncontentstore(basestore.baseunionstore):
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def __init__(self, *args, **kwargs):
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super(unioncontentstore, self).__init__(*args, **kwargs)
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self.stores = args
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self.writestore = kwargs.get('writestore')
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# If allowincomplete==True then the union store can return partial
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# delta chains, otherwise it will throw a KeyError if a full
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# deltachain can't be found.
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self.allowincomplete = kwargs.get('allowincomplete', False)
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def get(self, name, node):
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"""Fetches the full text revision contents of the given name+node pair.
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If the full text doesn't exist, throws a KeyError.
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Under the hood, this uses getdeltachain() across all the stores to build
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up a full chain to produce the full text.
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"""
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chain = self.getdeltachain(name, node)
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if chain[-1][ChainIndicies.BASENODE] != sha1nodeconstants.nullid:
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# If we didn't receive a full chain, throw
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raise KeyError((name, hex(node)))
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# The last entry in the chain is a full text, so we start our delta
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# applies with that.
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fulltext = chain.pop()[ChainIndicies.DATA]
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text = fulltext
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while chain:
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delta = chain.pop()[ChainIndicies.DATA]
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text = mdiff.patches(text, [delta])
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return text
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@basestore.baseunionstore.retriable
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def getdelta(self, name, node):
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"""Return the single delta entry for the given name/node pair."""
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for store in self.stores:
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try:
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return store.getdelta(name, node)
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except KeyError:
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pass
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raise KeyError((name, hex(node)))
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def getdeltachain(self, name, node):
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"""Returns the deltachain for the given name/node pair.
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Returns an ordered list of:
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[(name, node, deltabasename, deltabasenode, deltacontent),...]
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where the chain is terminated by a full text entry with a nullid
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deltabasenode.
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"""
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chain = self._getpartialchain(name, node)
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while chain[-1][ChainIndicies.BASENODE] != sha1nodeconstants.nullid:
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x, x, deltabasename, deltabasenode, x = chain[-1]
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try:
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morechain = self._getpartialchain(deltabasename, deltabasenode)
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chain.extend(morechain)
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except KeyError:
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# If we allow incomplete chains, don't throw.
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if not self.allowincomplete:
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raise
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break
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return chain
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@basestore.baseunionstore.retriable
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def getmeta(self, name, node):
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"""Returns the metadata dict for given node."""
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for store in self.stores:
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try:
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return store.getmeta(name, node)
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except KeyError:
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pass
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raise KeyError((name, hex(node)))
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def getmetrics(self):
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metrics = [s.getmetrics() for s in self.stores]
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return shallowutil.sumdicts(*metrics)
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@basestore.baseunionstore.retriable
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def _getpartialchain(self, name, node):
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"""Returns a partial delta chain for the given name/node pair.
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A partial chain is a chain that may not be terminated in a full-text.
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"""
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for store in self.stores:
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try:
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return store.getdeltachain(name, node)
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except KeyError:
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pass
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raise KeyError((name, hex(node)))
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def add(self, name, node, data):
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raise RuntimeError(
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b"cannot add content only to remotefilelog contentstore"
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)
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def getmissing(self, keys):
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missing = keys
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for store in self.stores:
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if missing:
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missing = store.getmissing(missing)
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return missing
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def addremotefilelognode(self, name, node, data):
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if self.writestore:
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self.writestore.addremotefilelognode(name, node, data)
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else:
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raise RuntimeError(b"no writable store configured")
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def markledger(self, ledger, options=None):
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for store in self.stores:
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store.markledger(ledger, options)
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class remotefilelogcontentstore(basestore.basestore):
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def __init__(self, *args, **kwargs):
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super(remotefilelogcontentstore, self).__init__(*args, **kwargs)
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self._threaddata = threading.local()
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def get(self, name, node):
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# return raw revision text
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data = self._getdata(name, node)
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offset, size, flags = shallowutil.parsesizeflags(data)
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content = data[offset : offset + size]
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ancestormap = shallowutil.ancestormap(data)
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p1, p2, linknode, copyfrom = ancestormap[node]
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copyrev = None
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if copyfrom:
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copyrev = hex(p1)
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self._updatemetacache(node, size, flags)
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# lfs tracks renames in its own metadata, remove hg copy metadata,
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# because copy metadata will be re-added by lfs flag processor.
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if flags & revlog.REVIDX_EXTSTORED:
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copyrev = copyfrom = None
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revision = shallowutil.createrevlogtext(content, copyfrom, copyrev)
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return revision
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def getdelta(self, name, node):
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# Since remotefilelog content stores only contain full texts, just
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# return that.
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revision = self.get(name, node)
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return (
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revision,
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name,
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sha1nodeconstants.nullid,
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self.getmeta(name, node),
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)
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def getdeltachain(self, name, node):
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# Since remotefilelog content stores just contain full texts, we return
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# a fake delta chain that just consists of a single full text revision.
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# The nullid in the deltabasenode slot indicates that the revision is a
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# fulltext.
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revision = self.get(name, node)
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return [(name, node, None, sha1nodeconstants.nullid, revision)]
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def getmeta(self, name, node):
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self._sanitizemetacache()
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if node != self._threaddata.metacache[0]:
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data = self._getdata(name, node)
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offset, size, flags = shallowutil.parsesizeflags(data)
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self._updatemetacache(node, size, flags)
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return self._threaddata.metacache[1]
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def add(self, name, node, data):
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raise RuntimeError(
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b"cannot add content only to remotefilelog contentstore"
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)
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def _sanitizemetacache(self):
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metacache = getattr(self._threaddata, 'metacache', None)
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if metacache is None:
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self._threaddata.metacache = (None, None) # (node, meta)
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def _updatemetacache(self, node, size, flags):
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self._sanitizemetacache()
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if node == self._threaddata.metacache[0]:
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return
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meta = {constants.METAKEYFLAG: flags, constants.METAKEYSIZE: size}
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self._threaddata.metacache = (node, meta)
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class remotecontentstore:
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def __init__(self, ui, fileservice, shared):
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self._fileservice = fileservice
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# type(shared) is usually remotefilelogcontentstore
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self._shared = shared
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def get(self, name, node):
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self._fileservice.prefetch(
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[(name, hex(node))], force=True, fetchdata=True
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)
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return self._shared.get(name, node)
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def getdelta(self, name, node):
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revision = self.get(name, node)
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return (
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revision,
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name,
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sha1nodeconstants.nullid,
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self._shared.getmeta(name, node),
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)
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def getdeltachain(self, name, node):
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# Since our remote content stores just contain full texts, we return a
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# fake delta chain that just consists of a single full text revision.
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# The nullid in the deltabasenode slot indicates that the revision is a
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# fulltext.
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revision = self.get(name, node)
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return [(name, node, None, sha1nodeconstants.nullid, revision)]
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def getmeta(self, name, node):
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self._fileservice.prefetch(
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[(name, hex(node))], force=True, fetchdata=True
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)
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return self._shared.getmeta(name, node)
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def add(self, name, node, data):
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raise RuntimeError(b"cannot add to a remote store")
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def getmissing(self, keys):
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return keys
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def markledger(self, ledger, options=None):
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pass
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class manifestrevlogstore:
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def __init__(self, repo):
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self._store = repo.store
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self._svfs = repo.svfs
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self._revlogs = dict()
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self._cl = revlog.revlog(self._svfs, radix=b'00changelog.i')
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self._repackstartlinkrev = 0
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def get(self, name, node):
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return self._revlog(name).rawdata(node)
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def getdelta(self, name, node):
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revision = self.get(name, node)
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return revision, name, self._cl.nullid, self.getmeta(name, node)
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def getdeltachain(self, name, node):
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revision = self.get(name, node)
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return [(name, node, None, self._cl.nullid, revision)]
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def getmeta(self, name, node):
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rl = self._revlog(name)
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rev = rl.rev(node)
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return {
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constants.METAKEYFLAG: rl.flags(rev),
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constants.METAKEYSIZE: rl.rawsize(rev),
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}
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def getancestors(self, name, node, known=None):
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if known is None:
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known = set()
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if node in known:
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return []
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rl = self._revlog(name)
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ancestors = {}
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missing = {node}
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for ancrev in rl.ancestors([rl.rev(node)], inclusive=True):
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ancnode = rl.node(ancrev)
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missing.discard(ancnode)
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p1, p2 = rl.parents(ancnode)
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if p1 != self._cl.nullid and p1 not in known:
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missing.add(p1)
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if p2 != self._cl.nullid and p2 not in known:
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missing.add(p2)
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linknode = self._cl.node(rl.linkrev(ancrev))
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ancestors[rl.node(ancrev)] = (p1, p2, linknode, b'')
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if not missing:
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break
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return ancestors
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def getnodeinfo(self, name, node):
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cl = self._cl
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rl = self._revlog(name)
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parents = rl.parents(node)
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linkrev = rl.linkrev(rl.rev(node))
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return (parents[0], parents[1], cl.node(linkrev), None)
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def add(self, *args):
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raise RuntimeError(b"cannot add to a revlog store")
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def _revlog(self, name):
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rl = self._revlogs.get(name)
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if rl is None:
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revlogname = b'00manifesttree'
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if name != b'':
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revlogname = b'meta/%s/00manifest' % name
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rl = revlog.revlog(self._svfs, radix=revlogname)
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self._revlogs[name] = rl
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return rl
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def getmissing(self, keys):
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missing = []
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for name, node in keys:
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mfrevlog = self._revlog(name)
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if node not in mfrevlog.nodemap:
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missing.append((name, node))
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return missing
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def setrepacklinkrevrange(self, startrev, endrev):
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self._repackstartlinkrev = startrev
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self._repackendlinkrev = endrev
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def markledger(self, ledger, options=None):
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if options and options.get(constants.OPTION_PACKSONLY):
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return
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treename = b''
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rl = revlog.revlog(self._svfs, radix=b'00manifesttree')
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startlinkrev = self._repackstartlinkrev
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endlinkrev = self._repackendlinkrev
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for rev in range(len(rl) - 1, -1, -1):
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linkrev = rl.linkrev(rev)
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if linkrev < startlinkrev:
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break
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if linkrev > endlinkrev:
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continue
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node = rl.node(rev)
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ledger.markdataentry(self, treename, node)
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ledger.markhistoryentry(self, treename, node)
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for t, path, size in self._store.data_entries():
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if path[:5] != b'meta/' or path[-2:] != b'.i':
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continue
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treename = path[5 : -len(b'/00manifest')]
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rl = revlog.revlog(self._svfs, indexfile=path[:-2])
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for rev in range(len(rl) - 1, -1, -1):
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linkrev = rl.linkrev(rev)
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if linkrev < startlinkrev:
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break
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if linkrev > endlinkrev:
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continue
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node = rl.node(rev)
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ledger.markdataentry(self, treename, node)
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ledger.markhistoryentry(self, treename, node)
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def cleanup(self, ledger):
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pass
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