--- /dev/null
+"""
+Helper module that implements helpers for test implementations.
+"""
+
+import unittest
+import os
+import subprocess
+import docker
+from emuvim.dcemulator.net import DCNetwork
+from mininet.clean import cleanup
+
+class SimpleTestTopology(unittest.TestCase):
+ """
+ Helper class to do basic test setups.
+ s1 -- s2 -- s3 -- ... -- sN
+ """
+
+ def __init__(self, *args, **kwargs):
+ self.net = None
+ self.s = [] # list of switches
+ self.h = [] # list of hosts
+ self.d = [] # list of docker containers
+ self.dc = [] # list of data centers
+ self.docker_cli = None
+ super(SimpleTestTopology, self).__init__(*args, **kwargs)
+
+ def createNet(
+ self,
+ nswitches=0, ndatacenter=0, nhosts=0, ndockers=0,
+ autolinkswitches=False):
+ """
+ Creates a Mininet instance and automatically adds some
+ nodes to it.
+ """
+ self.net = net = DCNetwork()
+
+ # add some switches
+ for i in range(0, nswitches):
+ self.s.append(self.net.addSwitch('s%d' % i))
+ # if specified, chain all switches
+ if autolinkswitches:
+ for i in range(0, len(self.s) - 1):
+ self.net.addLink(self.s[i], self.s[i + 1])
+ # add some data centers
+ for i in range(0, ndatacenter):
+ self.dc.append(
+ self.net.addDatacenter(
+ 'datacenter%d' % i,
+ metadata={"unittest_dc": i}))
+ # add some hosts
+ for i in range(0, nhosts):
+ self.h.append(self.net.addHost('h%d' % i))
+ # add some dockers
+ for i in range(0, ndockers):
+ self.d.append(self.net.addDocker('d%d' % i, dimage="ubuntu"))
+
+ def startNet(self):
+ self.net.start()
+
+ def stopNet(self):
+ self.net.stop()
+
+ def getDockerCli(self):
+ """
+ Helper to interact with local docker instance.
+ """
+ if self.docker_cli is None:
+ self.docker_cli = docker.Client(
+ base_url='unix://var/run/docker.sock')
+ return self.docker_cli
+
+ def getDockernetContainers(self):
+ """
+ List the containers managed by dockernet
+ """
+ return self.getDockerCli().containers(filters={"label": "com.dockernet"})
+
+ @staticmethod
+ def setUp():
+ pass
+
+ @staticmethod
+ def tearDown():
+ cleanup()
+ # make sure that all pending docker containers are killed
+ with open(os.devnull, 'w') as devnull:
+ subprocess.call(
+ "sudo docker rm -f $(sudo docker ps --filter 'label=com.dockernet' -a -q)",
+ stdout=devnull,
+ stderr=devnull,
+ shell=True)
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