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_validate_system():
from datetime import datetime
class BadSystem(object):
def __init__(self):
self.data = []
def bad_method(self):
now = datetime.now()
self.data.append(now)
with pytest.raises(PrevalentError) as error:
validate_system(BadSystem())
def test_validate_system_method_with_subscript():
class GoodSystem(object):
def __init__(self):
self.data = []
def ok_method(self):
temp = []
temp_el = temp[0]
element = self.data[0]
def ok2_method(self):
os.urandom(16).encode('hex')
return ''.join([])
assert validate_system(GoodSystem())
