author | Nicolas Dumazet <nicdumz.commits@gmail.com> |
Sun, 24 May 2009 18:43:05 +0900 | |
changeset 8599 | 1f706b1b62f3 |
parent 8363 | c8e81f557da7 |
child 9094 | 89ae64a4e2ec |
permissions | -rw-r--r-- |
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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 OSError, 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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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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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: |
108 | 145 |
try: |
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_playback(self.journal, self.report, self.opener, self.entries, False) |
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self.report(_("rollback completed\n")) |
108 | 148 |
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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162 | 157 |
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) |