src/nepi/testbeds/omf/omf_api.py

   1 import datetime
   2 import logging
   3 import ssl
   4 import sys
   5 import time
   6
   7 from nepi.testbeds.omf.omf_client import OMFClient
   8 from nepi.testbeds.omf.omf_messages import MessageHandler
   9
  10 class OmfAPI(object):
  11     def __init__(self, slice, host, port, password, debug):
  12         date = datetime.datetime.now().strftime("%Y-%m-%dt%H.%M.%S")
  13         tz = -time.altzone if time.daylight != 0 else -time.timezone
  14         date += "%+06.2f" % (tz / 3600) # timezone difference is in seconds
  15         self._user = "%s-%s" % (slice, date)
  16         self._slice = slice
  17         self._host = host
  18         self._port = port
  19         self._password = password
  20         self._hostnames = []
  21
  22         self._logger = logging.getLogger('nepi.testbeds.omfapi')
  23         if debug:
  24             self._logger.setLevel(logging.DEBUG)
  25
  26         # OMF xmpp client
  27         self._client = None
  28         # message handler
  29         self._message = None
  30
  31         if sys.version_info < (3, 0):
  32             reload(sys)
  33             sys.setdefaultencoding('utf8')
  34
  35         # instantiate the xmpp client
  36         self._init_client()
  37
  38         # register xmpp nodes for the experiment
  39         self._enroll_experiment()
  40
  41         # register xmpp logger for the experiment
  42         self._enroll_logger()
  43
  44     def _init_client(self):
  45         jid = "%s@%s" % (self._user, self._host)
  46         xmpp = OMFClient(jid, self._password)
  47         # PROTOCOL_SSLv3 required for compatibility with OpenFire
  48         xmpp.ssl_version = ssl.PROTOCOL_SSLv3
  49
  50         if xmpp.connect((self._host, self._port)):
  51             xmpp.process(threaded=True)
  52             while not xmpp.ready:
  53                 time.sleep(1)
  54             self._client = xmpp
  55             self._message = MessageHandler(self._slice, self._user)
  56         else:
  57             msg = "Unable to connect to the XMPP server."
  58             self._logger.error(msg)
  59             raise RuntimeError(msg)
  60
  61     def _enroll_experiment(self):
  62         xmpp_node = self._exp_session_id
  63         self._client.create(xmpp_node)
  64         self._client.subscribe(xmpp_node)
  65
  66         address = "/%s/OMF/%s/%s" % (self._host, self._slice, self._user)
  67         payload = self._message.newexpfunction(self._user, address)
  68         slice_sid = "/OMF/%s" % (self._slice)
  69         self._client.publish(payload, slice_sid)
  70
  71     def _enroll_logger(self):
  72         xmpp_node = self._logger_session_id
  73         self._client.create(xmpp_node)
  74         self._client.subscribe(xmpp_node)
  75
  76         payload = self._message.logfunction("2",
  77                 "nodeHandler::NodeHandler",
  78                 "INFO",
  79                 "OMF Experiment Controller 5.4 (git 529a626)")
  80         self._client.publish(payload, xmpp_node)
  81
  82     def _host_session_id(self, hostname):
  83         return "/OMF/%s/%s/%s" % (self._slice, self._user, hostname)
  84
  85     def _host_resource_id(self, hostname):
  86         return "/OMF/%s/resources/%s" % (self._slice, hostname)
  87
  88     @property
  89     def _exp_session_id(self):
  90         return "/OMF/%s/%s" % (self._slice, self._user)
  91
  92     @property
  93     def _logger_session_id(self):
  94         return "/OMF/%s/%s/LOGGER" % (self._slice, self._user)
  95
  96     def delete(self, hostname):
  97         if not hostname in self._hostnames:
  98             return
  99
 100         self._hostnames.remove(hostname)
 101
 102         xmpp_node = self._host_session_id(hostname)
 103         self._client.delete(xmpp_node)
 104
 105     def enroll_host(self, hostname):
 106         if hostname in self._hostnames:
 107             return
 108
 109         self._hostnames.append(hostname)
 110
 111         xmpp_node =  self._host_session_id(hostname)
 112         self._client.create(xmpp_node)
 113         self._client.subscribe(xmpp_node)
 114
 115         xmpp_node =  self._host_resource_id(hostname)
 116         self._client.subscribe(xmpp_node)
 117
 118         payload = self._message.enrollfunction("1", "*", "1", hostname)
 119         self._client.publish(payload, xmpp_node)
 120
 121     def configure(self, hostname, attribute, value):
 122         payload = self._message.configurefunction(hostname, value, attribute)
 123         xmpp_node =  self._host_session_id(hostname)
 124         self._client.publish(payload, xmpp_node)
 125
 126     def execute(self, hostname, app_id, arguments, path):
 127         payload = self._message.executefunction(hostname, app_id, arguments, path)
 128         xmpp_node =  self._host_session_id(hostname)
 129         self._client.publish(payload, xmpp_node)
 130
 131     def disconnect(self):
 132         self._client.delete(self._exp_session_id)
 133         self._client.delete(self._logger_session_id)
 134
 135         for hostname in self._hostnames[:]:
 136             self.delete(hostname)
 137
 138         time.sleep(5)
 139         self._client.disconnect()
 140