def __init__(self, name, *args, **kwargs):
Alternative.__init__(self, name)
# This is an instance of services.vpn.overlay.VpnOverlay
self._overlay = VpnOverlay()
# This is an instance of services.vpn.scenario.Rm3SdnVpnScenario
self._scenario = Rm3SdnVpnScenario(*args, **kwargs)
# This is an instance of services.vpn.configurator.Rm3SdnVpnConfigurator
self._configurator = Rm3SdnVpnConfigurator()
# This is a string reference to the class that models the environment. This is NOT a reference to the object!
self._environment = None
# Metrics to consider for this alternative. This is a list of model.metric.Metric objects
self._metrics = []
class Rm3SdnVpnAlternative(Alternative):
def __init__(self, name, *args, **kwargs):
Alternative.__init__(self, name)
# This is an instance of services.vpn.overlay.VpnOverlay
self._overlay = VpnOverlay()
# This is an instance of services.vpn.scenario.Rm3SdnVpnScenario
self._scenario = Rm3SdnVpnScenario(*args, **kwargs)
# This is an instance of services.vpn.configurator.Rm3SdnVpnConfigurator
self._configurator = Rm3SdnVpnConfigurator()
# This is a string reference to the class that models the environment. This is NOT a reference to the object!
self._environment = None
# Metrics to consider for this alternative. This is a list of model.metric.Metric objects
self._metrics = []
def __repr__(self):
return "Alternative[name=%s, scenario=%s, metrics=%s]" % (self._name, self._scenario.get_name(), self._metrics)
"""
Create the overlay for this alternative.
"""
def create_overlay(self, topology):
"""
Remember that is important to keep coherence between host-pe interface associations in the generation of network
and the interface written into the VPNs' configuration file. For this reason, the steps will be:
1. add switch to the overlay
2. generate the VPNs
3. add host to the overlay
4. add all links to the overlay, starting from the links between hosts and PEs
"""
# Step 1: add nodes to the overlay
nodes = topology.nodes()
for node in nodes:
# Here, create a node for VPN overlay
dpid = int(node) + 1
name = topology.node[node]["label"]
role = topology.node[node]["vrf_role"]
switch = Switch(dpid, name, role)
self._overlay.add_node(switch)
self._log.debug(
self.__class__.__name__, "Switch %s created and added to %s", switch, self._overlay.get_name()
)
# Step 2 and 3: generate VPNs and add hosts to the overlay (actually, links between hosts and PEs are added
# inside this method: generalize this procedure!!! Fixme.
self._configurator.create_vpns(self._overlay, self._scenario.get_number_of_vpns())
# Step 4: add links to the overlay; these links are only refereed to switches interconnections.
edges = topology.edges()
for edge in edges:
"""
When getting switches from the overlay, remember to convert the id in the edge tuple into an int value;
moreover, plus 1 to it, avoiding dpid with value zero.
"""
from_switch = self._overlay.get_node(int(edge[0]) + 1)
to_switch = self._overlay.get_node(int(edge[1]) + 1)
link = Link(from_switch, to_switch)
self._overlay.add_link(link)
self._log.debug(self.__class__.__name__, "Link %s created and added to %s", link, self._overlay.get_name())
return self._overlay
"""
Return the overlay associated to this alternative.
"""
def get_overlay(self):
return self._overlay
"""
Create the scenario associated to this alternative.
"""
def setting_up_scenario(self):
# Generate the configuration file
self._configurator.write_configurations(self._overlay)
# Start the scenario
self._scenario.start()
"""
Return the scenario associated with this alternative.
"""
def get_scenario(self):
return self._scenario
"""
Destroy the scenario associated to this alternative.
"""
def destroy(self):
self._scenario.destroy()
"""
Return the configurator associated to this alternative.
"""
def get_configurator(self):
return self._configurator
"""
Set the environment (object) to this alternative.
"""
def set_environment(self, environment):
self._environment = environment
"""
Get the environment (object) associated to this alternative.
"""
def get_environment(self):
return self._environment
"""
Add a metric to this alternative.
"""
def add_metric(self, metric):
self._metrics.append(metric)
"""
Return all metrics associated to this alternative. Those metrics are defined into configuration file.
"""
def get_metrics(self):
return self._metrics
