def __init__(self):
""" Initialize a topology definition
"""
self._filename = None
self._yaml = None
self._global_machine = None
self._networks = []
self._machines = []
self._state = State(self)
class TopologyRoot(object):
""" Topology definition
"""
def __init__(self):
""" Initialize a topology definition
"""
self._filename = None
self._yaml = None
self._global_machine = None
self._networks = []
self._machines = []
self._state = State(self)
def load(self, filename):
""" Load the topology from a YAML file
"""
self._filename = filename
if self._state.persisted:
self._state.load()
else:
logger.info('no previous state found for this topology')
logger.info('topology: loading from "%s"...', self._filename)
with open(self._filename) as infile:
content = infile.read()
self.load_str(content)
def load_str(self, string):
""" Load the topology from a YAML string
"""
try:
y = pyaml.yaml.load(string)
except yaml.scanner.ScannerError, e:
raise TopologyException('malformed topology file: %s' % str(e))
try:
self._yaml = y[YAML_ROOT]
except KeyError, e:
raise TopologyException('topology definition error: "%s" key not found' % str(e))
