emuvim/dcemulator/node.py

   1 """
   2 Distributed Cloud Emulator (dcemulator)
   3 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
   4 """
   5 import logging
   6
   7
   8 DCDPID_BASE = 1000  # start of switch dpid's used for data center switches
   9
  10
  11 class Datacenter(object):
  12     """
  13     Represents a logical data center to which compute resources
  14     (Docker containers) can be added at runtime.
  15
  16     Will also implement resource bookkeeping in later versions.
  17     """
  18
  19     def __init__(self, name):
  20         self.net = None  # DCNetwork to which we belong
  21         self.name = name
  22         self.switch = None  # first prototype assumes one "bigswitch" per DC
  23
  24     def _get_next_dc_dpid(self):
  25         global DCDPID_BASE
  26         DCDPID_BASE += 1
  27         return DCDPID_BASE
  28
  29     def create(self):
  30         """
  31         Each data center is represented by a single switch to which
  32         compute resources can be connected at run time.
  33
  34         TODO: This will be changed in the future to support multiple networks
  35         per data center
  36         """
  37         self.switch = self.net.mnet.addSwitch(
  38             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
  39         logging.debug("created data center switch: %s" % str(self.switch))
  40
  41     def start(self):
  42         pass
  43
  44     def addCompute(self, name):
  45         """
  46         Create a new container as compute resource and connect it to this
  47         data center.
  48         """
  49         #TODO remove mnet shortcut to have a clean API
  50         #TODO connect container to DC's swtich
  51         self.net.mnet.addDocker("%s.%s" % (self.name, name), dimage="ubuntu")
  52
  53     def removeCompute(self, name):
  54         #TODO remove mnet shortcut to have a clean API
  55         #TODO disconnect container to DC's swtich
  56         self.net.mnet.removeDocker("%s.%s" % (self.name, name))