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Support iterating over contents of an object store.

Changeset 09c754f4ded2…

Parent cd5a7ac6c7bd…

by Jelmer Vernooij

Changes to one file · Browse files at 09c754f4ded2 Showing diff from parent cd5a7ac6c7bd Diff from another changeset...

Change 1 of 3 Show Changes Only dulwich/​object_store.py Stacked
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 # object_store.py -- Object store for git objects  # Copyright (C) 2008 Jelmer Vernooij <jelmer@samba.org>  #  # This program is free software; you can redistribute it and/or  # modify it under the terms of the GNU General Public License  # as published by the Free Software Foundation; either version 2  # or (at your option) a later version of the License.  #  # This program is distributed in the hope that it will be useful,  # but WITHOUT ANY WARRANTY; without even the implied warranty of  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the  # GNU General Public License for more details.  #  # You should have received a copy of the GNU General Public License  # along with this program; if not, write to the Free Software  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,  # MA 02110-1301, USA.   +import itertools  import os  import tempfile  import urllib2    from dulwich.errors import (   NotTreeError,   )  from dulwich.objects import (   ShaFile,   Tree,   hex_to_sha,   sha_to_hex,   )  from dulwich.pack import (   Pack,   PackData,   iter_sha1,   load_packs,   load_pack_index,   write_pack,   write_pack_data,   write_pack_index_v2,   )    PACKDIR = 'pack'    class ObjectStore(object):   """Object store."""     def __init__(self, path):   """Open an object store.     :param path: Path of the object store.   """   self.path = path   self._pack_cache = None   self.pack_dir = os.path.join(self.path, PACKDIR)     def determine_wants_all(self, refs):   return [sha for (ref, sha) in refs.iteritems() if not sha in self and not ref.endswith("^{}")]     def iter_shas(self, shas):   """Iterate over the objects for the specified shas.     :param shas: Iterable object with SHAs   """   return ObjectStoreIterator(self, shas)     def __contains__(self, sha):   for pack in self.packs:   if sha in pack:   return True   ret = self._get_shafile(sha)   if ret is not None:   return True   return False   + def __iter__(self): + iterables = self.packs + [self._iter_shafile_shas()] + return itertools.chain(*iterables) +   @property   def packs(self):   """List with pack objects."""   if self._pack_cache is None:   self._pack_cache = list(load_packs(self.pack_dir))   return self._pack_cache     def _add_known_pack(self, path):   """Add a newly appeared pack to the cache by path.     """   if self._pack_cache is not None:   self._pack_cache.append(Pack(path))     def _get_shafile_path(self, sha):   dir = sha[:2]   file = sha[2:]   # Check from object dir   return os.path.join(self.path, dir, file) + + def _iter_shafile_shas(self): + for base in os.listdir(self.path): + if len(base) != 2: + continue + for rest in os.listdir(os.path.join(self.path, base)): + yield base+rest     def _get_shafile(self, sha):   path = self._get_shafile_path(sha)   if os.path.exists(path):   return ShaFile.from_file(path)   return None     def _add_shafile(self, sha, o):   dir = os.path.join(self.path, sha[:2])   if not os.path.isdir(dir):   os.mkdir(dir)   path = os.path.join(dir, sha[2:])   f = open(path, 'w+')   try:   f.write(o.as_legacy_object())   finally:   f.close()     def get_raw(self, name):   """Obtain the raw text for an object.     :param name: sha for the object.   :return: tuple with object type and object contents.   """   if len(name) == 40:   sha = hex_to_sha(name)   hexsha = name   elif len(name) == 20:   sha = name   hexsha = None   else:   raise AssertionError   for pack in self.packs:   try:   return pack.get_raw(sha)   except KeyError:   pass   if hexsha is None:   hexsha = sha_to_hex(name)   ret = self._get_shafile(hexsha)   if ret is not None:   return ret.type, ret.as_raw_string()   raise KeyError(hexsha)     def __getitem__(self, sha):   type, uncomp = self.get_raw(sha)   return ShaFile.from_raw_string(type, uncomp)     def move_in_thin_pack(self, path):   """Move a specific file containing a pack into the pack directory.     :note: The file should be on the same file system as the   packs directory.     :param path: Path to the pack file.   """   data = PackData(path)     # Write index for the thin pack (do we really need this?)   temppath = os.path.join(self.pack_dir,   sha_to_hex(urllib2.randombytes(20))+".tempidx")   data.create_index_v2(temppath, self.get_raw)   p = Pack.from_objects(data, load_pack_index(temppath))     # Write a full pack version   temppath = os.path.join(self.pack_dir,   sha_to_hex(urllib2.randombytes(20))+".temppack")   write_pack(temppath, ((o, None) for o in p.iterobjects(self.get_raw)),   len(p))   pack_sha = load_pack_index(temppath+".idx").objects_sha1()   newbasename = os.path.join(self.pack_dir, "pack-%s" % pack_sha)   os.rename(temppath+".pack", newbasename+".pack")   os.rename(temppath+".idx", newbasename+".idx")   self._add_known_pack(newbasename)     def move_in_pack(self, path):   """Move a specific file containing a pack into the pack directory.     :note: The file should be on the same file system as the   packs directory.     :param path: Path to the pack file.   """   p = PackData(path)   entries = p.sorted_entries()   basename = os.path.join(self.pack_dir,   "pack-%s" % iter_sha1(entry[0] for entry in entries))   write_pack_index_v2(basename+".idx", entries, p.get_stored_checksum())   os.rename(path, basename + ".pack")   self._add_known_pack(basename)     def add_thin_pack(self):   """Add a new thin pack to this object store.     Thin packs are packs that contain deltas with parents that exist   in a different pack.   """   fd, path = tempfile.mkstemp(dir=self.pack_dir, suffix=".pack")   f = os.fdopen(fd, 'w')   def commit():   os.fsync(fd)   f.close()   if os.path.getsize(path) > 0:   self.move_in_thin_pack(path)   return f, commit     def add_pack(self):   """Add a new pack to this object store.     :return: Fileobject to write to and a commit function to   call when the pack is finished.   """   fd, path = tempfile.mkstemp(dir=self.pack_dir, suffix=".pack")   f = os.fdopen(fd, 'w')   def commit():   os.fsync(fd)   f.close()   if os.path.getsize(path) > 0:   self.move_in_pack(path)   return f, commit     def add_object(self, obj):   self._add_shafile(obj.id, obj)     def add_objects(self, objects):   """Add a set of objects to this object store.     :param objects: Iterable over a list of objects.   """   if len(objects) == 0:   return   f, commit = self.add_pack()   write_pack_data(f, objects, len(objects))   commit()      class ObjectImporter(object):   """Interface for importing objects."""     def __init__(self, count):   """Create a new ObjectImporter.     :param count: Number of objects that's going to be imported.   """   self.count = count     def add_object(self, object):   """Add an object."""   raise NotImplementedError(self.add_object)     def finish(self, object):   """Finish the imoprt and write objects to disk."""   raise NotImplementedError(self.finish)      class ObjectIterator(object):   """Interface for iterating over objects."""     def iterobjects(self):   raise NotImplementedError(self.iterobjects)      class ObjectStoreIterator(ObjectIterator):   """ObjectIterator that works on top of an ObjectStore."""     def __init__(self, store, sha_iter):   self.store = store   self.sha_iter = sha_iter   self._shas = []     def __iter__(self):   for sha, path in self.itershas():   yield self.store[sha], path     def iterobjects(self):   for o, path in self:   yield o     def itershas(self):   for sha in self._shas:   yield sha   for sha in self.sha_iter:   self._shas.append(sha)   yield sha     def __contains__(self, needle):   """Check if an object is present.     :param needle: SHA1 of the object to check for   """   return needle in self.store     def __getitem__(self, key):   """Find an object by SHA1."""   return self.store[key]     def __len__(self):   """Return the number of objects."""   return len(list(self.itershas()))      def tree_lookup_path(lookup_obj, root_sha, path):   parts = path.split("/")   sha = root_sha   for p in parts:   obj = lookup_obj(sha)   if type(obj) is not Tree:   raise NotTreeError(sha)   if p == '':   continue   mode, sha = obj[p]   return lookup_obj(sha)