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
  17     def __init__(self, name):
  18         self.net = None  # DCNetwork to which we belong
  19         self.name = name
  20         self.switch = None  # first prototype assumes one "bigswitch" per DC
  21
  22     def _get_next_dc_dpid(self):
  23         global DCDPID_BASE
  24         DCDPID_BASE += 1
  25         return DCDPID_BASE
  26
  27     def create(self):
  28         """
  29         Each data center is represented by a single switch to which
  30         compute resources can be connected at run time.
  31
  32         TODO: This will be changed in the future to support multiple networks
  33         per data center
  34         """
  35         self.switch = self.net.mnet.addSwitch(
  36             "%s.s1" % self.name, dpid=hex(self._get_next_dc_dpid())[2:])
  37         logging.debug("created data center switch: %s" % str(self.switch))
  38
  39     def start(self):
  40         pass
  41
  42     def addCompute(self, name):
  43         #TODO remove mnet shortcut to have a clean API
  44         #TODO connect container to DC's swtich
  45         self.net.mnet.addDocker("%s.%s" % (self.name, name), dimage="ubuntu")
  46
  47     def removeCompute(self, name):
  48         #TODO remove mnet shortcut to have a clean API
  49         #TODO disconnect container to DC's swtich
  50         self.net.mnet.removeDocker("%s.%s" % (self.name, name))