def recover_snapshot(self):
file = open(path.join(self.basedir,fu.last_snapshot_file(self.basedir)),"rb")
if not file:
return None
logger.debug("Recovering snapshot from: " + file.name)
unpickler = Unpickler(file)
return unpickler.load()
def init_persistent_system(obj, basedir=None):
# a system object is needed in order to coopy work
if not obj:
raise Exception(CORE_LOG_PREFIX +
"Must input a valid object if there's no snapshot files")
# if obj is a class, change obj to an insance
if isinstance(obj, type):
obj = obj()
validate_system(obj)
# first step is to check basedir argument. if isn't defined
# coopy will create a directory name based on system class
if not basedir:
basedir = fileutils.obj_to_dir_name(obj)
# convert some string to a valid directory name
basedir = fileutils.name_to_dir(basedir)
system_data_path = os.getcwd()
# check if basedir exists, if not, create it
try:
os.listdir(basedir)
except os.error:
os.mkdir(basedir)
# if no snapshot files, create first one with a 'empty' system
if not fileutils.last_snapshot_file(basedir):
logger.info(CORE_LOG_PREFIX + "No snapshot files..")
SnapshotManager(basedir).take_snapshot(obj)
# measure restore time
start = datetime.utcnow()
logger.info(CORE_LOG_PREFIX + "coopy init....")
# inject clock on system object
inject(obj, '_clock', RecordClock())
inject(obj, '_system_data_path', system_data_path)
# RestoreHelper will recover a system state based on snapshots and
# transations files extracting actions executed previously and
# re-executing them again
obj = restore(obj, basedir)
end = datetime.utcnow()
delta = end - start
logger.info(CORE_LOG_PREFIX + "spent " + str(delta) + "microseconds")
journal = DiskJournal(basedir, system_data_path)
journal.setup()
snapshot_manager = SnapshotManager(basedir)
return CoopyProxy(obj, [journal], snapshot_manager=snapshot_manager)
def test_last_snapshot_file(self):
open(TEST_DIR + 'transaction_000000000000001.log', 'w')
open(TEST_DIR + 'transaction_000000000000002.log', 'w')
open(TEST_DIR + 'transaction_000000000000003.log', 'w')
open(TEST_DIR + 'snapshot_000000000000004.dat', 'w')
open(TEST_DIR + 'transaction_000000000000005.log', 'w')
result = fu.last_snapshot_file(TEST_DIR)
self.assertEqual('snapshot_000000000000004.dat',result)
self.tearDown()
self.setUp()
open(TEST_DIR + 'transaction_000000000000001.log', 'w')
open(TEST_DIR + 'transaction_000000000000002.log', 'w')
open(TEST_DIR + 'transaction_000000000000003.log', 'w')
open(TEST_DIR + 'snapshot_000000000000004.dat', 'w')
open(TEST_DIR + 'transaction_000000000000005.log', 'w')
open(TEST_DIR + 'snapshot_000000000000006.dat', 'w')
result = fu.last_snapshot_file(TEST_DIR)
self.assertEqual('snapshot_000000000000006.dat',result)
