def get_hashes(partition_dir,
recalculate=[],
do_listdir=False,
reclaim_age=ONE_WEEK):
"""
Get a list of hashes for the suffix dir. do_listdir causes it to mistrust
the hash cache for suffix existence at the (unexpectedly high) cost of a
listdir. reclaim_age is just passed on to hash_suffix.
:param partition_dir: absolute path of partition to get hashes for
:param recalculate: list of suffixes which should be recalculated when got
:param do_listdir: force existence check for all hashes in the partition
:param reclaim_age: age at which to remove tombstones
:returns: tuple of (number of suffix dirs hashed, dictionary of hashes)
"""
hashed = 0
hashes_file = join(partition_dir, HASH_FILE)
with lock_path(partition_dir):
modified = False
hashes = {}
try:
with open(hashes_file, 'rb') as fp:
hashes = pickle.load(fp)
except Exception:
do_listdir = True
if do_listdir:
hashes = dict(
((suff, hashes.get(suff, None))
for suff in os.listdir(partition_dir)
if len(suff) == 3 and isdir(join(partition_dir, suff))))
modified = True
for hash_ in recalculate:
hashes[hash_] = None
for suffix, hash_ in hashes.items():
if not hash_:
suffix_dir = join(partition_dir, suffix)
if os.path.exists(suffix_dir):
try:
hashes[suffix] = hash_suffix(suffix_dir, reclaim_age)
hashed += 1
except OSError:
logging.exception(_('Error hashing suffix'))
hashes[suffix] = None
else:
del hashes[suffix]
modified = True
sleep()
if modified:
write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)
return hashed, hashes
def get_hashes(partition_dir, recalculate=[], do_listdir=False,
reclaim_age=ONE_WEEK):
"""
Get a list of hashes for the suffix dir. do_listdir causes it to mistrust
the hash cache for suffix existence at the (unexpectedly high) cost of a
listdir. reclaim_age is just passed on to hash_suffix.
:param partition_dir: absolute path of partition to get hashes for
:param recalculate: list of suffixes which should be recalculated when got
:param do_listdir: force existence check for all hashes in the partition
:param reclaim_age: age at which to remove tombstones
:returns: tuple of (number of suffix dirs hashed, dictionary of hashes)
"""
hashed = 0
hashes_file = join(partition_dir, HASH_FILE)
with lock_path(partition_dir):
modified = False
hashes = {}
try:
with open(hashes_file, 'rb') as fp:
hashes = pickle.load(fp)
except Exception:
do_listdir = True
if do_listdir:
hashes = dict(((suff, hashes.get(suff, None))
for suff in os.listdir(partition_dir)
if len(suff) == 3 and isdir(join(partition_dir, suff))))
modified = True
for hash_ in recalculate:
hashes[hash_] = None
for suffix, hash_ in hashes.items():
if not hash_:
suffix_dir = join(partition_dir, suffix)
if os.path.exists(suffix_dir):
try:
hashes[suffix] = hash_suffix(suffix_dir, reclaim_age)
hashed += 1
except OSError:
logging.exception(_('Error hashing suffix'))
hashes[suffix] = None
else:
del hashes[suffix]
modified = True
sleep()
if modified:
write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)
return hashed, hashes
def invalidate_hash(suffix_dir):
"""
Invalidates the hash for a suffix_dir in the partition's hashes file.
:param suffix_dir: absolute path to suffix dir whose hash needs
invalidating
"""
suffix = os.path.basename(suffix_dir)
partition_dir = os.path.dirname(suffix_dir)
hashes_file = join(partition_dir, HASH_FILE)
with lock_path(partition_dir):
try:
with open(hashes_file, 'rb') as fp:
hashes = pickle.load(fp)
if suffix in hashes and not hashes[suffix]:
return
except Exception:
return
hashes[suffix] = None
write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)
def invalidate_hash(suffix_dir):
"""
Invalidates the hash for a suffix_dir in the partition's hashes file.
:param suffix_dir: absolute path to suffix dir whose hash needs
invalidating
"""
suffix = os.path.basename(suffix_dir)
partition_dir = os.path.dirname(suffix_dir)
hashes_file = join(partition_dir, HASH_FILE)
with lock_path(partition_dir):
try:
with open(hashes_file, 'rb') as fp:
hashes = pickle.load(fp)
if suffix in hashes and not hashes[suffix]:
return
except Exception:
return
hashes[suffix] = None
write_pickle(hashes, hashes_file, partition_dir, PICKLE_PROTOCOL)