transaction: turn a transaction into a Python context manager

This lets us greatly simply acquire/release cycles.

If the block completes without raising an exception, the transaction
is closed.

Code pattern before:

  try:
    tr = repo.transaction('x')
    # zillions of lines of code
    tr.close()
  finally:
    tr.release()

And after:

  with tr.transaction('x'):
    # ...

mercurial/transaction.py

@@ -1,562 +1,570 b''
 # transaction.py - simple journaling scheme for mercurial
 #
 # This transaction scheme is intended to gracefully handle program
 # errors and interruptions. More serious failures like system crashes
 # can be recovered with an fsck-like tool. As the whole repository is
 # effectively log-structured, this should amount to simply truncating
 # anything that isn't referenced in the changelog.
 #
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 from __future__ import absolute_import
 
 import errno
 
 from .i18n import _
 from . import (
     error,
     util,
 )
 
 version = 2
 
 def active(func):
     def _active(self, *args, **kwds):
         if self.count == 0:
             raise error.Abort(_(
                 'cannot use transaction when it is already committed/aborted'))
         return func(self, *args, **kwds)
     return _active
 
 def _playback(journal, report, opener, vfsmap, entries, backupentries,
               unlink=True):
     for f, o, _ignore in entries:
         if o or not unlink:
             try:
                 fp = opener(f, 'a')
                 fp.truncate(o)
                 fp.close()
             except IOError:
                 report(_("failed to truncate %s\n") % f)
                 raise
         else:
             try:
                 opener.unlink(f)
             except (IOError, OSError) as inst:
                 if inst.errno != errno.ENOENT:
                     raise
 
     backupfiles = []
     for l, f, b, c in backupentries:
         if l not in vfsmap and c:
             report("couldn't handle %s: unknown cache location %s\n"
                         % (b, l))
         vfs = vfsmap[l]
         try:
             if f and b:
                 filepath = vfs.join(f)
                 backuppath = vfs.join(b)
                 try:
                     util.copyfile(backuppath, filepath)
                     backupfiles.append(b)
                 except IOError:
                     report(_("failed to recover %s\n") % f)
             else:
                 target = f or b
                 try:
                     vfs.unlink(target)
                 except (IOError, OSError) as inst:
                     if inst.errno != errno.ENOENT:
                         raise
         except (IOError, OSError, error.Abort) as inst:
             if not c:
                 raise
 
     backuppath = "%s.backupfiles" % journal
     if opener.exists(backuppath):
         opener.unlink(backuppath)
     opener.unlink(journal)
     try:
         for f in backupfiles:
             if opener.exists(f):
                 opener.unlink(f)
     except (IOError, OSError, error.Abort) as inst:
         # only pure backup file remains, it is sage to ignore any error
         pass
 
 class transaction(object):
     def __init__(self, report, opener, vfsmap, journalname, undoname=None,
                  after=None, createmode=None, validator=None, releasefn=None):
         """Begin a new transaction
 
         Begins a new transaction that allows rolling back writes in the event of
         an exception.
 
         * `after`: called after the transaction has been committed
         * `createmode`: the mode of the journal file that will be created
         * `releasefn`: called after releasing (with transaction and result)
         """
         self.count = 1
         self.usages = 1
         self.report = report
         # a vfs to the store content
         self.opener = opener
         # a map to access file in various {location -> vfs}
         vfsmap = vfsmap.copy()
         vfsmap[''] = opener  # set default value
         self._vfsmap = vfsmap
         self.after = after
         self.entries = []
         self.map = {}
         self.journal = journalname
         self.undoname = undoname
         self._queue = []
         # A callback to validate transaction content before closing it.
         # should raise exception is anything is wrong.
         # target user is repository hooks.
         if validator is None:
             validator = lambda tr: None
         self.validator = validator
         # A callback to do something just after releasing transaction.
         if releasefn is None:
             releasefn = lambda tr, success: None
         self.releasefn = releasefn
 
         # a dict of arguments to be passed to hooks
         self.hookargs = {}
         self.file = opener.open(self.journal, "w")
 
         # a list of ('location', 'path', 'backuppath', cache) entries.
         # - if 'backuppath' is empty, no file existed at backup time
         # - if 'path' is empty, this is a temporary transaction file
         # - if 'location' is not empty, the path is outside main opener reach.
         #   use 'location' value as a key in a vfsmap to find the right 'vfs'
         # (cache is currently unused)
         self._backupentries = []
         self._backupmap = {}
         self._backupjournal = "%s.backupfiles" % self.journal
         self._backupsfile = opener.open(self._backupjournal, 'w')
         self._backupsfile.write('%d\n' % version)
 
         if createmode is not None:
             opener.chmod(self.journal, createmode & 0o666)
             opener.chmod(self._backupjournal, createmode & 0o666)
 
         # hold file generations to be performed on commit
         self._filegenerators = {}
         # hold callback to write pending data for hooks
         self._pendingcallback = {}
         # True is any pending data have been written ever
         self._anypending = False
         # holds callback to call when writing the transaction
         self._finalizecallback = {}
         # hold callback for post transaction close
         self._postclosecallback = {}
         # holds callbacks to call during abort
         self._abortcallback = {}
 
     def __del__(self):
         if self.journal:
             self._abort()
 
     @active
     def startgroup(self):
         """delay registration of file entry
 
         This is used by strip to delay vision of strip offset. The transaction
         sees either none or all of the strip actions to be done."""
         self._queue.append([])
 
     @active
     def endgroup(self):
         """apply delayed registration of file entry.
 
         This is used by strip to delay vision of strip offset. The transaction
         sees either none or all of the strip actions to be done."""
         q = self._queue.pop()
         for f, o, data in q:
             self._addentry(f, o, data)
 
     @active
     def add(self, file, offset, data=None):
         """record the state of an append-only file before update"""
         if file in self.map or file in self._backupmap:
             return
         if self._queue:
             self._queue[-1].append((file, offset, data))
             return
 
         self._addentry(file, offset, data)
 
     def _addentry(self, file, offset, data):
         """add a append-only entry to memory and on-disk state"""
         if file in self.map or file in self._backupmap:
             return
         self.entries.append((file, offset, data))
         self.map[file] = len(self.entries) - 1
         # add enough data to the journal to do the truncate
         self.file.write("%s\0%d\n" % (file, offset))
         self.file.flush()
 
     @active
     def addbackup(self, file, hardlink=True, location=''):
         """Adds a backup of the file to the transaction
 
         Calling addbackup() creates a hardlink backup of the specified file
         that is used to recover the file in the event of the transaction
         aborting.
 
         * `file`: the file path, relative to .hg/store
         * `hardlink`: use a hardlink to quickly create the backup
         """
         if self._queue:
             msg = 'cannot use transaction.addbackup inside "group"'
             raise RuntimeError(msg)
 
         if file in self.map or file in self._backupmap:
             return
         vfs = self._vfsmap[location]
         dirname, filename = vfs.split(file)
         backupfilename = "%s.backup.%s" % (self.journal, filename)
         backupfile = vfs.reljoin(dirname, backupfilename)
         if vfs.exists(file):
             filepath = vfs.join(file)
             backuppath = vfs.join(backupfile)
             util.copyfile(filepath, backuppath, hardlink=hardlink)
         else:
             backupfile = ''
 
         self._addbackupentry((location, file, backupfile, False))
 
     def _addbackupentry(self, entry):
         """register a new backup entry and write it to disk"""
         self._backupentries.append(entry)
         self._backupmap[entry[1]] = len(self._backupentries) - 1
         self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry)
         self._backupsfile.flush()
 
     @active
     def registertmp(self, tmpfile, location=''):
         """register a temporary transaction file
 
         Such files will be deleted when the transaction exits (on both
         failure and success).
         """
         self._addbackupentry((location, '', tmpfile, False))
 
     @active
     def addfilegenerator(self, genid, filenames, genfunc, order=0,
                          location=''):
         """add a function to generates some files at transaction commit
 
         The `genfunc` argument is a function capable of generating proper
         content of each entry in the `filename` tuple.
 
         At transaction close time, `genfunc` will be called with one file
         object argument per entries in `filenames`.
 
         The transaction itself is responsible for the backup, creation and
         final write of such file.
 
         The `genid` argument is used to ensure the same set of file is only
         generated once. Call to `addfilegenerator` for a `genid` already
         present will overwrite the old entry.
 
         The `order` argument may be used to control the order in which multiple
         generator will be executed.
 
         The `location` arguments may be used to indicate the files are located
         outside of the the standard directory for transaction. It should match
         one of the key of the `transaction.vfsmap` dictionary.
         """
         # For now, we are unable to do proper backup and restore of custom vfs
         # but for bookmarks that are handled outside this mechanism.
         self._filegenerators[genid] = (order, filenames, genfunc, location)
 
     def _generatefiles(self, suffix=''):
         # write files registered for generation
         any = False
         for entry in sorted(self._filegenerators.values()):
             any = True
             order, filenames, genfunc, location = entry
             vfs = self._vfsmap[location]
             files = []
             try:
                 for name in filenames:
                     name += suffix
                     if suffix:
                         self.registertmp(name, location=location)
                     else:
                         self.addbackup(name, location=location)
                     files.append(vfs(name, 'w', atomictemp=True))
                 genfunc(*files)
             finally:
                 for f in files:
                     f.close()
         return any
 
     @active
     def find(self, file):
         if file in self.map:
             return self.entries[self.map[file]]
         if file in self._backupmap:
             return self._backupentries[self._backupmap[file]]
         return None
 
     @active
     def replace(self, file, offset, data=None):
         '''
         replace can only replace already committed entries
         that are not pending in the queue
         '''
 
         if file not in self.map:
             raise KeyError(file)
         index = self.map[file]
         self.entries[index] = (file, offset, data)
         self.file.write("%s\0%d\n" % (file, offset))
         self.file.flush()
 
     @active
     def nest(self):
         self.count += 1
         self.usages += 1
         return self
 
     def release(self):
         if self.count > 0:
             self.usages -= 1
         # if the transaction scopes are left without being closed, fail
         if self.count > 0 and self.usages == 0:
             self._abort()
 
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        if exc_type is None:
+            self.close()
+        self.release()
+
     def running(self):
         return self.count > 0
 
     def addpending(self, category, callback):
         """add a callback to be called when the transaction is pending
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._pendingcallback[category] = callback
 
     @active
     def writepending(self):
         '''write pending file to temporary version
 
         This is used to allow hooks to view a transaction before commit'''
         categories = sorted(self._pendingcallback)
         for cat in categories:
             # remove callback since the data will have been flushed
             any = self._pendingcallback.pop(cat)(self)
             self._anypending = self._anypending or any
         self._anypending |= self._generatefiles(suffix='.pending')
         return self._anypending
 
     @active
     def addfinalize(self, category, callback):
         """add a callback to be called when the transaction is closed
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting old callbacks with
         newer callbacks.
         """
         self._finalizecallback[category] = callback
 
     @active
     def addpostclose(self, category, callback):
         """add a callback to be called after the transaction is closed
 
         The transaction will be given as callback's first argument.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._postclosecallback[category] = callback
 
     @active
     def addabort(self, category, callback):
         """add a callback to be called when the transaction is aborted.
 
         The transaction will be given as the first argument to the callback.
 
         Category is a unique identifier to allow overwriting an old callback
         with a newer callback.
         """
         self._abortcallback[category] = callback
 
     @active
     def close(self):
         '''commit the transaction'''
         if self.count == 1:
             self.validator(self)  # will raise exception if needed
             self._generatefiles()
             categories = sorted(self._finalizecallback)
             for cat in categories:
                 self._finalizecallback[cat](self)
 
         self.count -= 1
         if self.count != 0:
             return
         self.file.close()
         self._backupsfile.close()
         # cleanup temporary files
         for l, f, b, c in self._backupentries:
             if l not in self._vfsmap and c:
                 self.report("couldn't remove %s: unknown cache location %s\n"
                             % (b, l))
                 continue
             vfs = self._vfsmap[l]
             if not f and b and vfs.exists(b):
                 try:
                     vfs.unlink(b)
                 except (IOError, OSError, error.Abort) as inst:
                     if not c:
                         raise
                     # Abort may be raise by read only opener
                     self.report("couldn't remove %s: %s\n"
                                 % (vfs.join(b), inst))
         self.entries = []
         self._writeundo()
         if self.after:
             self.after()
         if self.opener.isfile(self._backupjournal):
             self.opener.unlink(self._backupjournal)
         if self.opener.isfile(self.journal):
             self.opener.unlink(self.journal)
         for l, _f, b, c in self._backupentries:
             if l not in self._vfsmap and c:
                 self.report("couldn't remove %s: unknown cache location"
                             "%s\n" % (b, l))
                 continue
             vfs = self._vfsmap[l]
             if b and vfs.exists(b):
                 try:
                     vfs.unlink(b)
                 except (IOError, OSError, error.Abort) as inst:
                     if not c:
                         raise
                     # Abort may be raise by read only opener
                     self.report("couldn't remove %s: %s\n"
                                 % (vfs.join(b), inst))
         self._backupentries = []
         self.journal = None
 
         self.releasefn(self, True) # notify success of closing transaction
 
         # run post close action
         categories = sorted(self._postclosecallback)
         for cat in categories:
             self._postclosecallback[cat](self)
 
     @active
     def abort(self):
         '''abort the transaction (generally called on error, or when the
         transaction is not explicitly committed before going out of
         scope)'''
         self._abort()
 
     def _writeundo(self):
         """write transaction data for possible future undo call"""
         if self.undoname is None:
             return
         undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w')
         undobackupfile.write('%d\n' % version)
         for l, f, b, c in self._backupentries:
             if not f:  # temporary file
                 continue
             if not b:
                 u = ''
             else:
                 if l not in self._vfsmap and c:
                     self.report("couldn't remove %s: unknown cache location"
                                 "%s\n" % (b, l))
                     continue
                 vfs = self._vfsmap[l]
                 base, name = vfs.split(b)
                 assert name.startswith(self.journal), name
                 uname = name.replace(self.journal, self.undoname, 1)
                 u = vfs.reljoin(base, uname)
                 util.copyfile(vfs.join(b), vfs.join(u), hardlink=True)
             undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c))
         undobackupfile.close()
 
 
     def _abort(self):
         self.count = 0
         self.usages = 0
         self.file.close()
         self._backupsfile.close()
 
         try:
             if not self.entries and not self._backupentries:
                 if self._backupjournal:
                     self.opener.unlink(self._backupjournal)
                 if self.journal:
                     self.opener.unlink(self.journal)
                 return
 
             self.report(_("transaction abort!\n"))
 
             try:
                 for cat in sorted(self._abortcallback):
                     self._abortcallback[cat](self)
                 _playback(self.journal, self.report, self.opener, self._vfsmap,
                           self.entries, self._backupentries, False)
                 self.report(_("rollback completed\n"))
             except BaseException:
                 self.report(_("rollback failed - please run hg recover\n"))
         finally:
             self.journal = None
             self.releasefn(self, False) # notify failure of transaction
 
 def rollback(opener, vfsmap, file, report):
     """Rolls back the transaction contained in the given file
 
     Reads the entries in the specified file, and the corresponding
     '*.backupfiles' file, to recover from an incomplete transaction.
 
     * `file`: a file containing a list of entries, specifying where
     to truncate each file.  The file should contain a list of
     file\0offset pairs, delimited by newlines. The corresponding
     '*.backupfiles' file should contain a list of file\0backupfile
     pairs, delimited by \0.
     """
     entries = []
     backupentries = []
 
     fp = opener.open(file)
     lines = fp.readlines()
     fp.close()
     for l in lines:
         try:
             f, o = l.split('\0')
             entries.append((f, int(o), None))
         except ValueError:
             report(_("couldn't read journal entry %r!\n") % l)
 
     backupjournal = "%s.backupfiles" % file
     if opener.exists(backupjournal):
         fp = opener.open(backupjournal)
         lines = fp.readlines()
         if lines:
             ver = lines[0][:-1]
             if ver == str(version):
                 for line in lines[1:]:
                     if line:
                         # Shave off the trailing newline
                         line = line[:-1]
                         l, f, b, c = line.split('\0')
                         backupentries.append((l, f, b, bool(c)))
             else:
                 report(_("journal was created by a different version of "
                          "Mercurial\n"))
 
     _playback(file, report, opener, vfsmap, entries, backupentries)