new example topology

diff --git a/src/emuvim/examples/son-monitor_test_topo.py b/src/emuvim/examples/son-monitor_test_topo.py
new file mode 100755 (executable)
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+++ b/src/emuvim/examples/son-monitor_test_topo.py
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+"""
+Copyright (c) 2015 SONATA-NFV
+ALL RIGHTS RESERVED.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION]
+nor the names of its contributors may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+
+This work has been performed in the framework of the SONATA project,
+funded by the European Commission under Grant number 671517 through
+the Horizon 2020 and 5G-PPP programmes. The authors would like to
+acknowledge the contributions of their colleagues of the SONATA
+partner consortium (www.sonata-nfv.eu).
+"""
+"""
+A simple topology with two PoPs for the y1 demo story board.
+
+        (dc1) <<-->> s1 <<-->> (dc2)
+"""
+
+import logging
+from mininet.log import setLogLevel
+from emuvim.dcemulator.net import DCNetwork
+from emuvim.api.rest.rest_api_endpoint import RestApiEndpoint
+from emuvim.api.sonata import SonataDummyGatekeeperEndpoint
+from mininet.node import RemoteController
+import signal
+import sys
+import time
+
+logging.basicConfig(level=logging.INFO)
+
+exit = False
+
+def create_topology1():
+
+    global exit
+
+    # create topology
+    net = DCNetwork(controller=RemoteController, monitor=True, enable_learning = False)
+    dc1 = net.addDatacenter("dc1")
+    dc2 = net.addDatacenter("dc2")
+    s1 = net.addSwitch("s1")
+    net.addLink(dc1, s1, delay="10ms")
+    net.addLink(dc2, s1, delay="20ms")
+
+    # add the command line interface endpoint to each DC (REST API)
+    rapi1 = RestApiEndpoint("0.0.0.0", 5001)
+    rapi1.connectDatacenter(dc1)
+    rapi1.connectDatacenter(dc2)
+    # connect total network also, needed to do the chaining and monitoring
+    rapi1.connectDCNetwork(net)
+    # run API endpoint server (in another thread, don't block)
+    rapi1.start()
+
+    # add the SONATA dummy gatekeeper to each DC
+    sdkg1 = SonataDummyGatekeeperEndpoint("0.0.0.0", 5000)
+    sdkg1.connectDatacenter(dc1)
+    sdkg1.connectDatacenter(dc2)
+    # run the dummy gatekeeper (in another thread, don't block)
+    sdkg1.start()
+
+    # start the emulation platform
+    net.start()
+    
+    #does not work from docker compose (cannot start container in interactive mode)
+    #cli = net.CLI()
+    # instead wait here:
+    logging.info("waiting for SIGTERM or SIGINT signal")
+    while not exit:
+        time.sleep(1)
+    logging.info("got SIG signal")
+    net.stop()
+
+def exit_gracefully(signum, frame):
+    """
+    7. At shutdown, we should receive the unix signal here and shutdown gracefully
+    """
+
+    global exit
+
+    logging.info('Signal handler called with signal {0}'.format(signum))
+    exit = True
+
+
+def main():
+    setLogLevel('info')  # set Mininet loglevel
+    # add the SIGTERM handler (eg. received when son-emu docker container stops)
+    signal.signal(signal.SIGTERM, exit_gracefully)
+    # also handle Ctrl-C
+    signal.signal(signal.SIGINT, exit_gracefully)
+    # start the topology
+    create_topology1()
+
+
+if __name__ == '__main__':
+    main()