class JujuApplicationExists(Exception):
"""The Application already exists."""
+
class N2VCPrimitiveExecutionFailed(Exception):
"""Something failed while attempting to execute a primitive."""
logging.getLogger('juju.model').setLevel(logging.WARN)
logging.getLogger('juju.machine').setLevel(logging.WARN)
+
class VCAMonitor(ModelObserver):
"""Monitor state changes within the Juju Model."""
- callback = None
- callback_args = None
log = None
ns_name = None
- application_name = None
+ applications = {}
- def __init__(self, ns_name, application_name, callback, *args):
+ def __init__(self, ns_name):
self.log = logging.getLogger(__name__)
self.ns_name = ns_name
- self.application_name = application_name
- self.callback = callback
- self.callback_args = args
+
+ def AddApplication(self, application_name, callback, *callback_args):
+ if application_name not in self.applications:
+ self.applications[application_name] = {
+ 'callback': callback,
+ 'callback_args': callback_args
+ }
+
+ def RemoveApplication(self, application_name):
+ if application_name in self.applications:
+ del self.applications[application_name]
async def on_change(self, delta, old, new, model):
"""React to changes in the Juju model."""
if delta.entity == "unit":
+ # Ignore change events from other applications
+ if delta.data['application'] not in self.applications.keys():
+ return
+
try:
+
+ application_name = delta.data['application']
+
+ callback = self.applications[application_name]['callback']
+ callback_args = self.applications[application_name]['callback_args']
+
if old and new:
old_status = old.workload_status
new_status = new.workload_status
if old_status == new_status:
-
"""The workload status may fluctuate around certain events,
so wait until the status has stabilized before triggering
the callback."""
- if self.callback:
- self.callback(
+ if callback:
+ callback(
self.ns_name,
- self.application_name,
+ delta.data['application'],
new_status,
- *self.callback_args)
+ *callback_args)
+
+ if old and not new:
+ # This is a charm being removed
+ if callback:
+ callback(
+ self.ns_name,
+ delta.data['application'],
+ "removed",
+ *callback_args)
except Exception as e:
self.log.debug("[1] notify_callback exception {}".format(e))
elif delta.entity == "action":
# Create unique models per network service
# Document all public functions
+
class N2VC:
# Juju API
if app:
raise JujuApplicationExists("Can't deploy application \"{}\" to model \"{}\" because it already exists.".format(application_name, model))
- ############################################################
- # Create a monitor to watch for application status changes #
- ############################################################
+ ################################################################
+ # Register this application with the model-level event monitor #
+ ################################################################
if callback:
- self.log.debug("Setting monitor<->callback")
- self.monitors[application_name] = VCAMonitor(model_name, application_name, callback, *callback_args)
- model.add_observer(self.monitors[application_name])
+ self.monitors[model_name].AddApplication(
+ application_name,
+ callback,
+ *callback_args
+ )
########################################################
# Check for specific machine placement (native charms) #
# This is applied when the Application is deployed
pass
else:
- # TODO: We need to sort by seq, and queue the actions in order.
-
seq = primitive['seq']
primitives[seq] = {
raise
async def ExecutePrimitive(self, model_name, application_name, primitive, callback, *callback_args, **params):
+ """
+ Queue the execution of a primitive
+
+ returns the UUID of the executed primitive
+ """
+ uuid = None
try:
if not self.authenticated:
await self.login()
# FIXME: This is hard-coded until model-per-ns is added
model_name = 'default'
+ model = await self.controller.get_model(model_name)
+
if primitive == 'config':
# config is special, and expecting params to be a dictionary
- await self.set_config(application_name, params['params'])
+ self.log.debug("Setting charm configuration for {}".format(application_name))
+ self.log.debug(params['params'])
+ await self.set_config(model, application_name, params['params'])
else:
- model = await self.controller.get_model(model_name)
app = await self.get_application(model, application_name)
if app:
# Run against the first (and probably only) unit in the app
if unit:
self.log.debug("Executing primitive {}".format(primitive))
action = await unit.run_action(primitive, **params)
- # action = await action.wait()
+ uuid = action.id
await model.disconnect()
except Exception as e:
self.log.debug("Caught exception while executing primitive: {}".format(e))
raise e
+ return uuid
async def RemoveCharms(self, model_name, application_name, callback=None, *callback_args):
try:
model = await self.get_model(model_name)
app = await self.get_application(model, application_name)
if app:
- self.notify_callback(model_name, application_name, "removing", callback, *callback_args)
+ # Remove this application from event monitoring
+ self.monitors[model_name].RemoveApplication(application_name)
+
+ # self.notify_callback(model_name, application_name, "removing", callback, *callback_args)
+ self.log.debug("Removing the application {}".format(application_name))
await app.remove()
+
+ # Notify the callback that this charm has been removed.
self.notify_callback(model_name, application_name, "removed", callback, *callback_args)
+
except Exception as e:
print("Caught exception: {}".format(e))
self.log.debug(e)
async def DestroyNetworkService(self, nsd):
raise NotImplementedError()
- async def GetMetrics(self, nsd, vnfd):
- """Get the metrics collected by the VCA."""
- raise NotImplementedError()
+ async def GetMetrics(self, model_name, application_name):
+ """Get the metrics collected by the VCA.
+
+ :param model_name The name of the model
+ :param application_name The name of the application
+ """
+ metrics = {}
+ model = await self.get_model(model_name)
+ app = await self.get_application(model, application_name)
+ if app:
+ metrics = await app.get_metrics()
+
+ return metrics
# Non-public methods
async def add_relation(self, a, b, via=None):
finally:
await m.disconnect()
- async def apply_config(self, config, application):
- """Apply a configuration to the application."""
- print("JujuApi: Applying configuration to {}.".format(
- application
- ))
- return await self.set_config(application=application, config=config)
+ # async def apply_config(self, config, application):
+ # """Apply a configuration to the application."""
+ # print("JujuApi: Applying configuration to {}.".format(
+ # application
+ # ))
+ # return await self.set_config(application=application, config=config)
def _get_config_from_dict(self, config_primitive, values):
"""Transform the yang config primitive to dict.
print("connecting to model {}".format(model_name))
self.models[model_name] = await self.controller.get_model(model_name)
+ # Create an observer for this model
+ self.monitors[model_name] = VCAMonitor(model_name)
+ self.models[model_name].add_observer(self.monitors[model_name])
+
return self.models[model_name]
async def login(self):
return result
- async def set_config(self, application, config):
+ async def set_config(self, model_name, application, config):
"""Apply a configuration to the application."""
if not self.authenticated:
await self.login()
- app = await self.get_application(self.default_model, application)
+ app = await self.get_application(model_name, application)
if app:
self.log.debug("JujuApi: Setting config for Application {}".format(
application,
if config[key] != newconf[key]['value']:
self.log.debug("JujuApi: Config not set! Key {} Value {} doesn't match {}".format(key, config[key], newconf[key]))
- async def set_parameter(self, parameter, value, application=None):
- """Set a config parameter for a service."""
- if not self.authenticated:
- await self.login()
-
- self.log.debug("JujuApi: Setting {}={} for Application {}".format(
- parameter,
- value,
- application,
- ))
- return await self.apply_config(
- {parameter: value},
- application=application,
- )
+ # async def set_parameter(self, parameter, value, application=None):
+ # """Set a config parameter for a service."""
+ # if not self.authenticated:
+ # await self.login()
+ #
+ # self.log.debug("JujuApi: Setting {}={} for Application {}".format(
+ # parameter,
+ # value,
+ # application,
+ # ))
+ # return await self.apply_config(
+ # {parameter: value},
+ # application=application,
+ # )
async def wait_for_application(self, name, timeout=300):
"""Wait for an application to become active."""
projects / osm / N2VC.git / commitdiff