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())