src/emuvim/test/base.py

   1 """
   2 Helper module that implements helpers for test implementations.
   3 """
   4
   5 import unittest
   6 import os
   7 import subprocess
   8 import docker
   9 from emuvim.dcemulator.net import DCNetwork
  10 from mininet.clean import cleanup
  11
  12 class SimpleTestTopology(unittest.TestCase):
  13     """
  14         Helper class to do basic test setups.
  15         s1 -- s2 -- s3 -- ... -- sN
  16     """
  17
  18     def __init__(self, *args, **kwargs):
  19         self.net = None
  20         self.s = []   # list of switches
  21         self.h = []   # list of hosts
  22         self.d = []   # list of docker containers
  23         self.dc = []  # list of data centers
  24         self.docker_cli = None
  25         super(SimpleTestTopology, self).__init__(*args, **kwargs)
  26
  27     def createNet(
  28             self,
  29             nswitches=0, ndatacenter=0, nhosts=0, ndockers=0,
  30             autolinkswitches=False):
  31         """
  32         Creates a Mininet instance and automatically adds some
  33         nodes to it.
  34         """
  35         self.net = net = DCNetwork()
  36
  37         # add some switches
  38         for i in range(0, nswitches):
  39             self.s.append(self.net.addSwitch('s%d' % i))
  40         # if specified, chain all switches
  41         if autolinkswitches:
  42             for i in range(0, len(self.s) - 1):
  43                 self.net.addLink(self.s[i], self.s[i + 1])
  44         # add some data centers
  45         for i in range(0, ndatacenter):
  46             self.dc.append(
  47                 self.net.addDatacenter(
  48                     'datacenter%d' % i,
  49                     metadata={"unittest_dc": i}))
  50         # add some hosts
  51         for i in range(0, nhosts):
  52             self.h.append(self.net.addHost('h%d' % i))
  53         # add some dockers
  54         for i in range(0, ndockers):
  55             self.d.append(self.net.addDocker('d%d' % i, dimage="ubuntu"))
  56
  57     def startNet(self):
  58         self.net.start()
  59
  60     def stopNet(self):
  61         self.net.stop()
  62
  63     def getDockerCli(self):
  64         """
  65         Helper to interact with local docker instance.
  66         """
  67         if self.docker_cli is None:
  68             self.docker_cli = docker.Client(
  69                 base_url='unix://var/run/docker.sock')
  70         return self.docker_cli
  71
  72     def getDockernetContainers(self):
  73         """
  74         List the containers managed by dockernet
  75         """
  76         return self.getDockerCli().containers(filters={"label": "com.dockernet"})
  77
  78     @staticmethod
  79     def setUp():
  80         pass
  81
  82     @staticmethod
  83     def tearDown():
  84         cleanup()
  85         # make sure that all pending docker containers are killed
  86         with open(os.devnull, 'w') as devnull:
  87             subprocess.call(
  88                 "sudo docker rm -f $(sudo docker ps --filter 'label=com.dockernet' -a -q)",
  89                 stdout=devnull,
  90                 stderr=devnull,
  91                 shell=True)