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, xmpp_root = None):
  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         self._xmpp_root = xmpp_root or "OMF"
  22
  23         self._logger = logging.getLogger("nepi.testbeds.omf")
  24
  25         # OMF xmpp client
  26         self._client = None
  27         # message handler
  28         self._message = None
  29
  30         if sys.version_info < (3, 0):
  31             reload(sys)
  32             sys.setdefaultencoding('utf8')
  33
  34         # instantiate the xmpp client
  35         self._init_client()
  36
  37         # register xmpp nodes for the experiment
  38         self._enroll_experiment()
  39
  40         # register xmpp logger for the experiment
  41         self._enroll_logger()
  42
  43     def _init_client(self):
  44         jid = "%s@%s" % (self._user, self._host)
  45         xmpp = OMFClient(jid, self._password)
  46         # PROTOCOL_SSLv3 required for compatibility with OpenFire
  47         xmpp.ssl_version = ssl.PROTOCOL_SSLv3
  48
  49         if xmpp.connect((self._host, self._port)):
  50             xmpp.process(threaded=True)
  51             while not xmpp.ready:
  52                 time.sleep(1)
  53             self._client = xmpp
  54             self._message = MessageHandler(self._slice, self._user)
  55         else:
  56             msg = "Unable to connect to the XMPP server."
  57             self._logger.error(msg)
  58             raise RuntimeError(msg)
  59
  60     def _enroll_experiment(self):
  61         xmpp_node = self._exp_session_id
  62         self._client.create(xmpp_node)
  63         self._client.subscribe(xmpp_node)
  64
  65         address = "/%s/%s/%s/%s" % (self._host, self._xmpp_root, self._slice, self._user)
  66         payload = self._message.newexpfunction(self._user, address)
  67         slice_sid = "/%s/%s" % (self._xmpp_root, self._slice)
  68         self._client.publish(payload, slice_sid)
  69
  70     def _enroll_logger(self):
  71         xmpp_node = self._logger_session_id
  72         self._client.create(xmpp_node)
  73         self._client.subscribe(xmpp_node)
  74
  75         payload = self._message.logfunction("2",
  76                 "nodeHandler::NodeHandler",
  77                 "INFO",
  78                 "OMF Experiment Controller 5.4 (git 529a626)")
  79         self._client.publish(payload, xmpp_node)
  80
  81     def _host_session_id(self, hostname):
  82         return "/%s/%s/%s/%s" % (self._xmpp_root, self._slice, self._user, hostname)
  83
  84     def _host_resource_id(self, hostname):
  85         return "/%s/%s/resources/%s" % (self._xmpp_root, self._slice, hostname)
  86
  87     @property
  88     def _exp_session_id(self):
  89         return "/%s/%s/%s" % (self._xmpp_root, self._slice, self._user)
  90
  91     @property
  92     def _logger_session_id(self):
  93         return "/%s/%s/%s/LOGGER" % (self._xmpp_root, self._slice, self._user)
  94
  95     def delete(self, hostname):
  96         if not hostname in self._hostnames:
  97             return
  98
  99         self._hostnames.remove(hostname)
 100
 101         xmpp_node = self._host_session_id(hostname)
 102         self._client.delete(xmpp_node)
 103
 104     def enroll_host(self, hostname):
 105         if hostname in self._hostnames:
 106             return
 107
 108         self._hostnames.append(hostname)
 109
 110         xmpp_node =  self._host_session_id(hostname)
 111         self._client.create(xmpp_node)
 112         self._client.subscribe(xmpp_node)
 113
 114         xmpp_node =  self._host_resource_id(hostname)
 115         self._client.subscribe(xmpp_node)
 116
 117         payload = self._message.enrollfunction("1", "*", "1", hostname)
 118         self._client.publish(payload, xmpp_node)
 119
 120     def configure(self, hostname, attribute, value):
 121         payload = self._message.configurefunction(hostname, value, attribute)
 122         xmpp_node =  self._host_session_id(hostname)
 123         self._client.publish(payload, xmpp_node)
 124
 125     def execute(self, hostname, app_id, arguments, path, env):
 126         payload = self._message.executefunction(hostname, app_id, arguments, path, env)
 127         xmpp_node =  self._host_session_id(hostname)
 128         self._client.publish(payload, xmpp_node)
 129
 130     def exit(self, hostname, app_id):
 131         payload = self._message.exitfunction(hostname, app_id)
 132         xmpp_node =  self._host_session_id(hostname)
 133         self._client.publish(payload, xmpp_node)
 134
 135     def disconnect(self):
 136         self._client.delete(self._exp_session_id)
 137         self._client.delete(self._logger_session_id)
 138
 139         for hostname in self._hostnames[:]:
 140             self.delete(hostname)
 141
 142         time.sleep(5)
 143         self._client.disconnect()
 144