def __init__(self, statefile):
"""Open, lock, read and parse the file.
@type statefile: file
@param statefile: State file object
"""
self.statefile = statefile
try:
state_data = self.statefile.read()
if not state_data:
self._data = {}
else:
self._data = serializer.Load(state_data)
except Exception as msg: # pylint: disable=W0703
# Ignore errors while loading the file and treat it as empty
self._data = {}
logging.warning(("Invalid state file. Using defaults."
" Error message: %s"), msg)
if "instance" not in self._data:
self._data["instance"] = {}
if "node" not in self._data:
self._data["node"] = {}
self._orig_data = serializer.Dump(self._data)
def _ValidateResult(self):
"""Process the allocator results.
This will process and if successful save the result in
self.out_data and the other parameters.
"""
try:
rdict = serializer.Load(self.out_text)
except Exception as err:
raise errors.OpExecError("Can't parse iallocator results: %s" %
str(err))
if not isinstance(rdict, dict):
raise errors.OpExecError(
"Can't parse iallocator results: not a dict")
# TODO: remove backwards compatiblity in later versions
if "nodes" in rdict and "result" not in rdict:
rdict["result"] = rdict["nodes"]
del rdict["nodes"]
for key in "success", "info", "result":
if key not in rdict:
raise errors.OpExecError("Can't parse iallocator results:"
" missing key '%s'" % key)
setattr(self, key, rdict[key])
self.req.ValidateResult(self, self.result)
self.out_data = rdict
def _ValidateResult(self):
"""Process the allocator results.
This will process and if successful save the result in
self.out_data and the other parameters.
"""
try:
rdict = serializer.Load(self.out_text)
except Exception, err:
raise errors.OpExecError("Can't parse iallocator results: %s" % str(err))
def _LoadInstanceStash(self, instance_name):
"""Load information stashed in file which was created by
L{_SaveInstanceStash}.
"""
stash_file = self._InstanceStashFilePath(instance_name)
try:
return serializer.Load(utils.ReadFile(stash_file))
except (EnvironmentError, ValueError) as err:
raise HypervisorError(
"Failed to load instance stash file %s : %s" %
(stash_file, err))
