222 lines
7 KiB
Python
222 lines
7 KiB
Python
"""
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Provides an EMANE network node class, which has several attached NEMs that
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share the same MAC+PHY model.
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"""
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import logging
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from core.emulator.enumerations import LinkTypes, NodeTypes, RegisterTlvs
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from core.nodes.base import CoreNetworkBase
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try:
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from emane.events import LocationEvent
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except ImportError:
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try:
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from emanesh.events import LocationEvent
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except ImportError:
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logging.debug("compatible emane python bindings not installed")
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class EmaneNet(CoreNetworkBase):
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"""
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EMANE node contains NEM configuration and causes connected nodes
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to have TAP interfaces (instead of VEth). These are managed by the
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Emane controller object that exists in a session.
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"""
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apitype = NodeTypes.EMANE.value
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linktype = LinkTypes.WIRELESS.value
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type = "wlan"
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is_emane = True
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def __init__(self, session, _id=None, name=None, start=True, server=None):
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super().__init__(session, _id, name, start, server)
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self.conf = ""
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self.up = False
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self.nemidmap = {}
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self.model = None
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self.mobility = None
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def linkconfig(
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self,
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netif,
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bw=None,
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delay=None,
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loss=None,
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duplicate=None,
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jitter=None,
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netif2=None,
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):
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"""
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The CommEffect model supports link configuration.
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"""
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if not self.model:
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return
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return self.model.linkconfig(
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netif=netif,
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bw=bw,
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delay=delay,
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loss=loss,
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duplicate=duplicate,
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jitter=jitter,
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netif2=netif2,
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)
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def config(self, conf):
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self.conf = conf
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def shutdown(self):
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pass
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def link(self, netif1, netif2):
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pass
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def unlink(self, netif1, netif2):
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pass
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def updatemodel(self, config):
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if not self.model:
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raise ValueError("no model set to update for node(%s)", self.id)
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logging.info(
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"node(%s) updating model(%s): %s", self.id, self.model.name, config
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)
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self.model.set_configs(config, node_id=self.id)
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def setmodel(self, model, config):
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"""
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set the EmaneModel associated with this node
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"""
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logging.info("adding model: %s", model.name)
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if model.config_type == RegisterTlvs.WIRELESS.value:
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# EmaneModel really uses values from ConfigurableManager
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# when buildnemxml() is called, not during init()
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self.model = model(session=self.session, _id=self.id)
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self.model.update_config(config)
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elif model.config_type == RegisterTlvs.MOBILITY.value:
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self.mobility = model(session=self.session, _id=self.id)
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self.mobility.update_config(config)
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def setnemid(self, netif, nemid):
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"""
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Record an interface to numerical ID mapping. The Emane controller
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object manages and assigns these IDs for all NEMs.
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"""
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self.nemidmap[netif] = nemid
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def getnemid(self, netif):
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"""
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Given an interface, return its numerical ID.
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"""
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if netif not in self.nemidmap:
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return None
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else:
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return self.nemidmap[netif]
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def getnemnetif(self, nemid):
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"""
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Given a numerical NEM ID, return its interface. This returns the
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first interface that matches the given NEM ID.
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"""
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for netif in self.nemidmap:
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if self.nemidmap[netif] == nemid:
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return netif
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return None
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def netifs(self, sort=True):
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"""
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Retrieve list of linked interfaces sorted by node number.
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"""
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return sorted(self._netif.values(), key=lambda ifc: ifc.node.id)
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def installnetifs(self):
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"""
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Install TAP devices into their namespaces. This is done after
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EMANE daemons have been started, because that is their only chance
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to bind to the TAPs.
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"""
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if (
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self.session.emane.genlocationevents()
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and self.session.emane.service is None
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):
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warntxt = "unable to publish EMANE events because the eventservice "
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warntxt += "Python bindings failed to load"
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logging.error(warntxt)
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for netif in self.netifs():
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external = self.session.emane.get_config(
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"external", self.id, self.model.name
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)
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if external == "0":
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netif.setaddrs()
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if not self.session.emane.genlocationevents():
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netif.poshook = None
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continue
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# at this point we register location handlers for generating
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# EMANE location events
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netif.poshook = self.setnemposition
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x, y, z = netif.node.position.get()
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self.setnemposition(netif, x, y, z)
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def deinstallnetifs(self):
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"""
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Uninstall TAP devices. This invokes their shutdown method for
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any required cleanup; the device may be actually removed when
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emanetransportd terminates.
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"""
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for netif in self.netifs():
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if "virtual" in netif.transport_type.lower():
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netif.shutdown()
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netif.poshook = None
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def setnemposition(self, netif, x, y, z):
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"""
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Publish a NEM location change event using the EMANE event service.
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"""
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if self.session.emane.service is None:
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logging.info("position service not available")
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return
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nemid = self.getnemid(netif)
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ifname = netif.localname
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if nemid is None:
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logging.info("nemid for %s is unknown", ifname)
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return
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lat, lon, alt = self.session.location.getgeo(x, y, z)
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event = LocationEvent()
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# altitude must be an integer or warning is printed
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# unused: yaw, pitch, roll, azimuth, elevation, velocity
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alt = int(round(alt))
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event.append(nemid, latitude=lat, longitude=lon, altitude=alt)
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self.session.emane.service.publish(0, event)
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def setnempositions(self, moved_netifs):
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"""
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Several NEMs have moved, from e.g. a WaypointMobilityModel
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calculation. Generate an EMANE Location Event having several
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entries for each netif that has moved.
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"""
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if len(moved_netifs) == 0:
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return
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if self.session.emane.service is None:
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logging.info("position service not available")
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return
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event = LocationEvent()
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i = 0
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for netif in moved_netifs:
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nemid = self.getnemid(netif)
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ifname = netif.localname
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if nemid is None:
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logging.info("nemid for %s is unknown", ifname)
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continue
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x, y, z = netif.node.getposition()
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lat, lon, alt = self.session.location.getgeo(x, y, z)
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# altitude must be an integer or warning is printed
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alt = int(round(alt))
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event.append(nemid, latitude=lat, longitude=lon, altitude=alt)
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i += 1
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self.session.emane.service.publish(0, event)
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