def _validate(G):
'''
Validates dependency graph to ensure it has no missing or cyclic dependencies
'''
for name in G.nodes():
if 'value' not in G.node[name] and 'template' not in G.node[name]:
msg = 'Dependency unsatisfied in variable "%s"' % name
raise ParamException(msg)
if not nx.is_directed_acyclic_graph(G):
graph_cycles = nx.simple_cycles(G)
variable_names = []
for cycle in graph_cycles:
try:
variable_name = cycle[0]
except IndexError:
continue
variable_names.append(variable_name)
variable_names = ', '.join(sorted(variable_names))
msg = (
'Cyclic dependency found in the following variables: %s. Likely the variable is '
'referencing itself' % (variable_names))
raise ParamException(msg)
def _validate(G):
'''
Validates dependency graph to ensure it has no missing or cyclic dependencies
'''
for name in G.nodes():
if 'value' not in G.node[name] and 'template' not in G.node[name]:
msg = 'Dependecy unsatisfied in %s' % name
raise ParamException(msg)
if not nx.is_directed_acyclic_graph(G):
msg = 'Cyclic dependecy found'
raise ParamException(msg)
def _resolve_dependencies(G):
'''
Traverse the dependency graph starting from resolved nodes
'''
context = {}
for name in nx.topological_sort(G):
node = G.node[name]
try:
template = node.get('template', None)
# Special case for non simple types which contains Jinja notation (lists, dicts)
if 'template' in node and isinstance(template, (list, dict)):
if isinstance(template, list):
rendered_list = list()
for template in G.node[name]['template']:
rendered_list.append(
_render(dict(template=template), context))
context[name] = rendered_list
elif isinstance(template, dict):
rendered_dict = dict()
for key, value in G.node[name]['template'].items():
value = _render(dict(template=value), context)
rendered_dict[key] = value
context[name] = rendered_dict
else:
context[name] = _render(node, context)
except Exception as e:
LOG.debug('Failed to render %s: %s', name, e, exc_info=True)
msg = 'Failed to render parameter "%s": %s' % (name, str(e))
raise ParamException(msg)
return context
def __init__(self, *args, **kwargs):
super(TokenController, self).__init__(*args, **kwargs)
try:
self.handler = HANDLER_MAPPINGS[cfg.CONF.auth.mode]()
except KeyError:
raise ParamException("%s is not a valid auth mode" %
cfg.CONF.auth.mode)
def _resolve_dependencies(G):
'''
Traverse the dependency graph starting from resolved nodes
'''
context = {}
for name in nx.topological_sort(G):
node = G.node[name]
try:
context[name] = _render(node, context)
except Exception as e:
LOG.debug('Failed to render %s: %s', name, e, exc_info=True)
msg = 'Failed to render parameter "%s": %s' % (name, str(e))
raise ParamException(msg)
return context
def _resolve_dependencies(G):
'''
Traverse the dependency graph starting from resolved nodes
'''
context = {}
for name in nx.topological_sort(G):
node = G.node[name]
try:
if 'template' in node and isinstance(node.get('template', None),
list):
rendered_list = list()
for template in G.node[name]['template']:
rendered_list.append(
_render(dict(template=template), context))
context[name] = rendered_list
else:
context[name] = _render(node, context)
except Exception as e:
LOG.debug('Failed to render %s: %s', name, e, exc_info=True)
msg = 'Failed to render parameter "%s": %s' % (name, str(e))
raise ParamException(msg)
return context
def __init__(self):
try:
self.handler = HANDLER_MAPPINGS[cfg.CONF.auth.mode]()
except KeyError:
raise ParamException("%s is not a valid auth mode" %
cfg.CONF.auth.mode)
