[ns3-30] Enable visualization of Python scripts
I didn't know the cause and I was really into it, so it's a memorandum.
environment
OS: Ubuntu 18.04 ns3: 3.30
Status
Here, ʻexample / tutoral / third.py` is used as an example. https://www.nsnam.org/doxygen/third_8py_source.html
Note that third.cc with the same content will be visualized normally even if it is executed with the vis flag.
$ ./waf --run scratch/mythird --vis
Waf: Entering directory `/usr/ns/ns-3.30/build'
Waf: Leaving directory `/usr/ns/ns-3.30/build'
Build commands will be stored in build/compile_commands.json
'build' finished successfully (0.652s)
Could not load plugin 'show_last_packets.py': No module named 'kiwi'
Could not load icon applets-screenshooter due to missing gnomedesktop Python module
scanning topology: 8 nodes...
scanning topology: calling graphviz layout
scanning topology: all done.
Runs fine without the vis flag
$ ./waf --pyrun examples/tutorial/third.py
Waf: Entering directory `/usr/ns/ns-3.30/build'
Waf: Leaving directory `/usr/ns/ns-3.30/build'
Build commands will be stored in build/compile_commands.json
'build' finished successfully (0.652s)
At time 2s client sent 1024 bytes to 10.1.2.4 port 9
At time 2.01799s server received 1024 bytes from 10.1.3.3 port 49153
At time 2.01799s server sent 1024 bytes to 10.1.3.3 port 49153
At time 2.03371s client received 1024 bytes from 10.1.2.4 port 9
An error occurs when the vis flag is set.
$ ./waf --pyrun examples/tutorial/third.py --vis
Waf: Entering directory `/usr/ns/ns-3.30/build'
Waf: Leaving directory `/usr/ns/ns-3.30/build'
Build commands will be stored in build/compile_commands.json
'build' finished successfully (0.707s)
assert failed. cond="uid != 0", msg="Assert in TypeId::LookupByName: ns3::VisualSimulatorImpl not found", file=../src/core/model/type-id.cc, line=828
terminate called without an active exception
Command ['/usr/bin/python3', 'examples/tutorial/third.py', '--SimulatorImplementationType=ns3::VisualSimulatorImpl'] terminated with signal SIGIOT. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb --args %s <args>").
The error only states that you can use the debugger, and you'll be at a loss.
If you get a Warning called Gtk-Warning, it is possible that the Gtk version does not match. Install the appropriate Gtk.
Solution
Actually, one package is missing. Let's import ns.visualizer with the following command.
import ns.visualizer
This is quietly written on the Wiki page. I want you to put it in from the beginning w https://www.nsnam.org/wiki/PyViz
The modified third.py is as follows.
third.py
# -*- Mode: Python; -*-
# /*
# * This program is free software; you can redistribute it and/or modify
# * it under the terms of the GNU General Public License version 2 as
# * published by the Free Software Foundation;
# *
# * This program is distributed in the hope that it will be useful,
# * but WITHOUT ANY WARRANTY; without even the implied warranty of
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# * GNU General Public License for more details.
# *
# * You should have received a copy of the GNU General Public License
# * along with this program; if not, write to the Free Software
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# *
# * Ported to Python by Mohit P. Tahiliani
# */
import ns.core
import ns.network
import ns.point_to_point
import ns.applications
import ns.wifi
import ns.mobility
import ns.csma
import ns.internet
import sys
import ns.visualizer
# // Default Network Topology
# //
# // Wifi 10.1.3.0
# // AP
# // * * * *
# // | | | | 10.1.1.0
# // n5 n6 n7 n0 -------------- n1 n2 n3 n4
# // point-to-point | | | |
# // ================
# // LAN 10.1.2.0
cmd = ns.core.CommandLine()
cmd.nCsma = 3
cmd.verbose = "True"
cmd.nWifi = 3
cmd.tracing = "False"
cmd.AddValue("nCsma", "Number of \"extra\" CSMA nodes/devices")
cmd.AddValue("nWifi", "Number of wifi STA devices")
cmd.AddValue("verbose", "Tell echo applications to log if true")
cmd.AddValue("tracing", "Enable pcap tracing")
cmd.Parse(sys.argv)
nCsma = int(cmd.nCsma)
verbose = cmd.verbose
nWifi = int(cmd.nWifi)
tracing = cmd.tracing
# The underlying restriction of 18 is due to the grid position
# allocator's configuration; the grid layout will exceed the
# bounding box if more than 18 nodes are provided.
if nWifi > 18:
print ("nWifi should be 18 or less; otherwise grid layout exceeds the bounding box")
sys.exit(1)
if verbose == "True":
ns.core.LogComponentEnable("UdpEchoClientApplication", ns.core.LOG_LEVEL_INFO)
ns.core.LogComponentEnable("UdpEchoServerApplication", ns.core.LOG_LEVEL_INFO)
p2pNodes = ns.network.NodeContainer()
p2pNodes.Create(2)
pointToPoint = ns.point_to_point.PointToPointHelper()
pointToPoint.SetDeviceAttribute("DataRate", ns.core.StringValue("5Mbps"))
pointToPoint.SetChannelAttribute("Delay", ns.core.StringValue("2ms"))
p2pDevices = pointToPoint.Install(p2pNodes)
csmaNodes = ns.network.NodeContainer()
csmaNodes.Add(p2pNodes.Get(1))
csmaNodes.Create(nCsma)
csma = ns.csma.CsmaHelper()
csma.SetChannelAttribute("DataRate", ns.core.StringValue("100Mbps"))
csma.SetChannelAttribute("Delay", ns.core.TimeValue(ns.core.NanoSeconds(6560)))
csmaDevices = csma.Install(csmaNodes)
wifiStaNodes = ns.network.NodeContainer()
wifiStaNodes.Create(nWifi)
wifiApNode = p2pNodes.Get(0)
channel = ns.wifi.YansWifiChannelHelper.Default()
phy = ns.wifi.YansWifiPhyHelper.Default()
phy.SetChannel(channel.Create())
wifi = ns.wifi.WifiHelper()
wifi.SetRemoteStationManager("ns3::AarfWifiManager")
mac = ns.wifi.WifiMacHelper()
ssid = ns.wifi.Ssid ("ns-3-ssid")
mac.SetType ("ns3::StaWifiMac", "Ssid", ns.wifi.SsidValue(ssid), "ActiveProbing", ns.core.BooleanValue(False))
staDevices = wifi.Install(phy, mac, wifiStaNodes)
mac.SetType("ns3::ApWifiMac","Ssid", ns.wifi.SsidValue (ssid))
apDevices = wifi.Install(phy, mac, wifiApNode)
mobility = ns.mobility.MobilityHelper()
mobility.SetPositionAllocator ("ns3::GridPositionAllocator", "MinX", ns.core.DoubleValue(0.0),
"MinY", ns.core.DoubleValue (0.0), "DeltaX", ns.core.DoubleValue(5.0), "DeltaY", ns.core.DoubleValue(10.0),
"GridWidth", ns.core.UintegerValue(3), "LayoutType", ns.core.StringValue("RowFirst"))
mobility.SetMobilityModel ("ns3::RandomWalk2dMobilityModel", "Bounds", ns.mobility.RectangleValue(ns.mobility.Rectangle (-50, 50, -50, 50)))
mobility.Install(wifiStaNodes)
mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel")
mobility.Install(wifiApNode)
stack = ns.internet.InternetStackHelper()
stack.Install(csmaNodes)
stack.Install(wifiApNode)
stack.Install(wifiStaNodes)
address = ns.internet.Ipv4AddressHelper()
address.SetBase(ns.network.Ipv4Address("10.1.1.0"), ns.network.Ipv4Mask("255.255.255.0"))
p2pInterfaces = address.Assign(p2pDevices)
address.SetBase(ns.network.Ipv4Address("10.1.2.0"), ns.network.Ipv4Mask("255.255.255.0"))
csmaInterfaces = address.Assign(csmaDevices)
address.SetBase(ns.network.Ipv4Address("10.1.3.0"), ns.network.Ipv4Mask("255.255.255.0"))
address.Assign(staDevices)
address.Assign(apDevices)
echoServer = ns.applications.UdpEchoServerHelper(9)
serverApps = echoServer.Install(csmaNodes.Get(nCsma))
serverApps.Start(ns.core.Seconds(1.0))
serverApps.Stop(ns.core.Seconds(10.0))
echoClient = ns.applications.UdpEchoClientHelper(csmaInterfaces.GetAddress(nCsma), 9)
echoClient.SetAttribute("MaxPackets", ns.core.UintegerValue(1))
echoClient.SetAttribute("Interval", ns.core.TimeValue(ns.core.Seconds (1.0)))
echoClient.SetAttribute("PacketSize", ns.core.UintegerValue(1024))
clientApps = echoClient.Install(wifiStaNodes.Get (nWifi - 1))
clientApps.Start(ns.core.Seconds(2.0))
clientApps.Stop(ns.core.Seconds(10.0))
ns.internet.Ipv4GlobalRoutingHelper.PopulateRoutingTables()
ns.core.Simulator.Stop(ns.core.Seconds(10.0))
if tracing == "True":
pointToPoint.EnablePcapAll ("third")
phy.EnablePcap ("third", apDevices.Get (0))
csma.EnablePcap ("third", csmaDevices.Get (0), True)
ns.core.Simulator.Run()
ns.core.Simulator.Destroy()
This should successfully launch the visualizer in Python.
that's all
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