mercurial/transaction.py
author Sune Foldager <cryo@cyanite.org>
Tue, 27 Oct 2009 10:33:41 +0100
changeset 9650 1ad02c04356c
parent 9220 8a4da1388553
child 9686 ddf2adf88b89
permissions -rw-r--r--
bundlerepo: fix small bug in exception raising
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# transaction.py - simple journalling scheme for mercurial
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#
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# This transaction scheme is intended to gracefully handle program
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# errors and interruptions. More serious failures like system crashes
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# can be recovered with an fsck-like tool. As the whole repository is
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# effectively log-structured, this should amount to simply truncating
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# anything that isn't referenced in the changelog.
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#
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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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, incorporated herein by reference.
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from i18n import _
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import os, errno
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import error
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def active(func):
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    def _active(self, *args, **kwds):
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        if self.count == 0:
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            raise error.Abort(_(
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                'cannot use transaction when it is already committed/aborted'))
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        return func(self, *args, **kwds)
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    return _active
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def _playback(journal, report, opener, entries, unlink=True):
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    for f, o, ignore in entries:
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        if o or not unlink:
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            try:
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                opener(f, 'a').truncate(o)
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            except:
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                report(_("failed to truncate %s\n") % f)
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                raise
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        else:
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            try:
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                fn = opener(f).name
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                os.unlink(fn)
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            except IOError, inst:
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                if inst.errno != errno.ENOENT:
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                    raise
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    os.unlink(journal)
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class transaction(object):
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    def __init__(self, report, opener, journal, after=None, createmode=None):
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        self.journal = None
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        self.count = 1
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        self.report = report
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        self.opener = opener
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        self.after = after
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        self.entries = []
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        self.map = {}
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        self.journal = journal
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        self._queue = []
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        self.file = open(self.journal, "w")
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        if createmode is not None:
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            os.chmod(self.journal, createmode & 0666)
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    def __del__(self):
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        if self.journal:
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            if self.entries: self._abort()
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            self.file.close()
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    @active
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    def startgroup(self):
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        self._queue.append([])
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    @active
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    def endgroup(self):
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        q = self._queue.pop()
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        d = ''.join(['%s\0%d\n' % (x[0], x[1]) for x in q])
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        self.entries.extend(q)
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        self.file.write(d)
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        self.file.flush()
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    @active
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    def add(self, file, offset, data=None):
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        if file in self.map: return
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        if self._queue:
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            self._queue[-1].append((file, offset, data))
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            return
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        self.entries.append((file, offset, data))
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        self.map[file] = len(self.entries) - 1
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        # add enough data to the journal to do the truncate
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        self.file.write("%s\0%d\n" % (file, offset))
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        self.file.flush()
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    @active
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    def find(self, file):
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        if file in self.map:
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            return self.entries[self.map[file]]
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        return None
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    @active
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    def replace(self, file, offset, data=None):
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        '''
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        replace can only replace already committed entries
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        that are not pending in the queue
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        '''
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        if file not in self.map:
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            raise KeyError(file)
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        index = self.map[file]
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        self.entries[index] = (file, offset, data)
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        self.file.write("%s\0%d\n" % (file, offset))
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        self.file.flush()
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    @active
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    def nest(self):
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        self.count += 1
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        return self
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    def running(self):
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        return self.count > 0
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    @active
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    def close(self):
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        '''commit the transaction'''
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        self.count -= 1
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        if self.count != 0:
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            return
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        self.file.close()
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        self.entries = []
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        if self.after:
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            self.after()
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        else:
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            os.unlink(self.journal)
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        self.journal = None
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    @active
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    def abort(self):
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        '''abort the transaction (generally called on error, or when the
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        transaction is not explicitly committed before going out of
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        scope)'''
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        self._abort()
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    def _abort(self):
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        self.count = 0
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        self.file.close()
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        if not self.entries: return
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        self.report(_("transaction abort!\n"))
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        try:
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            try:
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                _playback(self.journal, self.report, self.opener, self.entries, False)
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                self.report(_("rollback completed\n"))
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            except:
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                self.report(_("rollback failed - please run hg recover\n"))
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        finally:
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            self.journal = None
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def rollback(opener, file, report):
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    entries = []
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    for l in open(file).readlines():
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        f, o = l.split('\0')
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        entries.append((f, int(o), None))
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    _playback(file, report, opener, entries)