emuvim/api/zerorpcapi.py

   1 """
   2 Distributed Cloud Emulator (dcemulator)
   3 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
   4 """
   5
   6 import logging
   7 import threading
   8 import zerorpc
   9
  10 logging.basicConfig(level=logging.INFO)
  11
  12
  13 class ZeroRpcApiEndpoint(object):
  14     """
  15     Simple API endpoint that offers a zerorpc-based
  16     interface. This interface will be used by the
  17     default command line client.
  18     It can be used as a reference to implement
  19     REST interfaces providing the same semantics,
  20     like e.g. OpenStack compute API.
  21     """
  22
  23     def __init__(self, listenip, port):
  24         self.dcs = {}
  25         self.ip = listenip
  26         self.port = port
  27         logging.debug("Created API endpoint %s(%s:%d)" % (
  28             self.__class__.__name__, self.ip, self.port))
  29
  30     def connectDatacenter(self, dc):
  31         self.dcs[dc.name] = dc
  32         logging.info("Connected DC(%s) to API endpoint %s(%s:%d)" % (
  33             dc.name, self.__class__.__name__, self.ip, self.port))
  34
  35     def start(self):
  36         thread = threading.Thread(target=self._api_server_thread, args=())
  37         thread.daemon = True
  38         thread.start()
  39         logging.debug("Started API endpoint %s(%s:%d)" % (
  40             self.__class__.__name__, self.ip, self.port))
  41
  42     def _api_server_thread(self):
  43         s = zerorpc.Server(MultiDatacenterApi(self.dcs))
  44         s.bind("tcp://%s:%d" % (self.ip, self.port))
  45         s.run()
  46
  47
  48 class MultiDatacenterApi(object):
  49     """
  50         Just pass through the corresponding request to the
  51         selected data center. Do not implement provisioning
  52         logic here because will will have multiple API
  53         endpoint implementations at the end.
  54     """
  55
  56     def __init__(self, dcs):
  57         self.dcs = dcs
  58
  59     def compute_action_start(self, dc_name, compute_name, image):
  60         # TODO what to return UUID / given name / internal name ?
  61         logging.debug("RPC CALL: compute start")
  62         try:
  63             c = self.dcs.get(dc_name).startCompute(compute_name, image=image)
  64             return str(c.name)
  65         except Exception as ex:
  66             logging.exception("RPC error.")
  67             return ex.message
  68
  69     def compute_action_stop(self, dc_name, compute_name):
  70         logging.debug("RPC CALL: compute stop")
  71         try:
  72             return self.dcs.get(dc_name).stopCompute(compute_name)
  73         except Exception as ex:
  74             logging.exception("RPC error.")
  75             return ex.message
  76
  77     def compute_list(self, dc_name):
  78         logging.debug("RPC CALL: compute list")
  79         try:
  80             if dc_name is None:
  81                 # return list with all compute nodes in all DCs
  82                 all_containers = []
  83                 for dc in self.dcs.itervalues():
  84                     all_containers += dc.listCompute()
  85                 return [(c.name, c.getStatus())
  86                         for c in all_containers]
  87             else:
  88                 # return list of compute nodes for specified DC
  89                 return [(c.name, c.getStatus())
  90                         for c in self.dcs.get(dc_name).listCompute()]
  91         except Exception as ex:
  92             logging.exception("RPC error.")
  93             return ex.message
  94
  95     def compute_status(self, dc_name, compute_name):
  96         logging.debug("RPC CALL: compute status")
  97         try:
  98             return self.dcs.get(
  99                 dc_name).containers.get(compute_name).getStatus()
 100         except Exception as ex:
 101             logging.exception("RPC error.")
 102             return ex.message