def save(self):
"""Saves PluginStorage content to disk
:raises .errors.PluginStorageError: when unable to serialize the data
or write it to the filesystem
"""
if not self._initialized:
errmsg = "Unable to save, no values have been added to PluginStorage."
logger.error(errmsg)
raise errors.PluginStorageError(errmsg)
try:
serialized = json.dumps(self._data)
except TypeError as e:
errmsg = "Could not serialize PluginStorage data: {0}".format(
str(e))
logger.error(errmsg)
raise errors.PluginStorageError(errmsg)
try:
with os.fdopen(
filesystem.open(self._storagepath,
os.O_WRONLY | os.O_CREAT | os.O_TRUNC,
0o600), 'w') as fh:
fh.write(serialized)
except IOError as e:
errmsg = "Could not write PluginStorage data to file {0} : {1}".format(
self._storagepath, str(e))
logger.error(errmsg)
raise errors.PluginStorageError(errmsg)
def _load(self):
"""Reads PluginStorage content from the disk to a dict structure
:raises .errors.PluginStorageError: when unable to open or read the file
"""
data = {} # type: Dict[str, Any]
filedata = ""
try:
with open(self._storagepath, 'r') as fh:
filedata = fh.read()
except IOError as e:
errmsg = "Could not read PluginStorage data file: {0} : {1}".format(
self._storagepath, str(e))
if os.path.isfile(self._storagepath):
# Only error out if file exists, but cannot be read
logger.error(errmsg)
raise errors.PluginStorageError(errmsg)
try:
data = json.loads(filedata)
except ValueError:
if not filedata:
logger.debug(
"Plugin storage file %s was empty, no values loaded",
self._storagepath)
else:
errmsg = "PluginStorage file {0} is corrupted.".format(
self._storagepath)
logger.error(errmsg)
raise errors.PluginStorageError(errmsg)
self._data = data