osm_lcm/lcm.py

   1 #!/usr/bin/python3
   2 # -*- coding: utf-8 -*-
   3
   4 ##
   5 # Copyright 2018 Telefonica S.A.
   6 #
   7 # Licensed under the Apache License, Version 2.0 (the "License"); you may
   8 # not use this file except in compliance with the License. You may obtain
   9 # a copy of the License at
  10 #
  11 #         http://www.apache.org/licenses/LICENSE-2.0
  12 #
  13 # Unless required by applicable law or agreed to in writing, software
  14 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  15 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  16 # License for the specific language governing permissions and limitations
  17 # under the License.
  18 ##
  19
  20 import asyncio
  21 import yaml
  22 import logging
  23 import logging.handlers
  24 import getopt
  25 import sys
  26 import ROclient
  27 import ns
  28 import vim_sdn
  29 import netslice
  30 from time import time, sleep
  31 from lcm_utils import versiontuple, LcmException, TaskRegistry, LcmExceptionExit
  32
  33 # from osm_lcm import version as lcm_version, version_date as lcm_version_date, ROclient
  34 from osm_common import dbmemory, dbmongo, fslocal, msglocal, msgkafka
  35 from osm_common import version as common_version
  36 from osm_common.dbbase import DbException
  37 from osm_common.fsbase import FsException
  38 from osm_common.msgbase import MsgException
  39 from os import environ, path
  40 from random import choice as random_choice
  41 from n2vc import version as n2vc_version
  42
  43
  44 __author__ = "Alfonso Tierno"
  45 min_RO_version = [0, 6, 3]
  46 min_n2vc_version = "0.0.2"
  47 min_common_version = "0.1.19"
  48 # uncomment if LCM is installed as library and installed, and get them from __init__.py
  49 lcm_version = '0.1.41'
  50 lcm_version_date = '2019-06-19'
  51 health_check_file = path.expanduser("~") + "/time_last_ping"   # TODO find better location for this file
  52
  53
  54 class Lcm:
  55
  56     ping_interval_pace = 120  # how many time ping is send once is confirmed all is running
  57     ping_interval_boot = 5    # how many time ping is sent when booting
  58
  59     def __init__(self, config_file, loop=None):
  60         """
  61         Init, Connect to database, filesystem storage, and messaging
  62         :param config: two level dictionary with configuration. Top level should contain 'database', 'storage',
  63         :return: None
  64         """
  65
  66         self.db = None
  67         self.msg = None
  68         self.msg_admin = None
  69         self.fs = None
  70         self.pings_not_received = 1
  71         self.consecutive_errors = 0
  72         self.first_start = False
  73
  74         # contains created tasks/futures to be able to cancel
  75         self.lcm_tasks = TaskRegistry()
  76         # logging
  77         self.logger = logging.getLogger('lcm')
  78         # get id
  79         self.worker_id = self.get_process_id()
  80         # load configuration
  81         config = self.read_config_file(config_file)
  82         self.config = config
  83         self.ro_config = {
  84             "endpoint_url": "http://{}:{}/openmano".format(config["RO"]["host"], config["RO"]["port"]),
  85             "tenant": config.get("tenant", "osm"),
  86             "logger_name": "lcm.ROclient",
  87             "loglevel": "ERROR",
  88         }
  89
  90         self.vca_config = config["VCA"]
  91
  92         self.loop = loop or asyncio.get_event_loop()
  93
  94         # logging
  95         log_format_simple = "%(asctime)s %(levelname)s %(name)s %(filename)s:%(lineno)s %(message)s"
  96         log_formatter_simple = logging.Formatter(log_format_simple, datefmt='%Y-%m-%dT%H:%M:%S')
  97         config["database"]["logger_name"] = "lcm.db"
  98         config["storage"]["logger_name"] = "lcm.fs"
  99         config["message"]["logger_name"] = "lcm.msg"
 100         if config["global"].get("logfile"):
 101             file_handler = logging.handlers.RotatingFileHandler(config["global"]["logfile"],
 102                                                                 maxBytes=100e6, backupCount=9, delay=0)
 103             file_handler.setFormatter(log_formatter_simple)
 104             self.logger.addHandler(file_handler)
 105         if not config["global"].get("nologging"):
 106             str_handler = logging.StreamHandler()
 107             str_handler.setFormatter(log_formatter_simple)
 108             self.logger.addHandler(str_handler)
 109
 110         if config["global"].get("loglevel"):
 111             self.logger.setLevel(config["global"]["loglevel"])
 112
 113         # logging other modules
 114         for k1, logname in {"message": "lcm.msg", "database": "lcm.db", "storage": "lcm.fs"}.items():
 115             config[k1]["logger_name"] = logname
 116             logger_module = logging.getLogger(logname)
 117             if config[k1].get("logfile"):
 118                 file_handler = logging.handlers.RotatingFileHandler(config[k1]["logfile"],
 119                                                                     maxBytes=100e6, backupCount=9, delay=0)
 120                 file_handler.setFormatter(log_formatter_simple)
 121                 logger_module.addHandler(file_handler)
 122             if config[k1].get("loglevel"):
 123                 logger_module.setLevel(config[k1]["loglevel"])
 124         self.logger.critical("starting osm/lcm version {} {}".format(lcm_version, lcm_version_date))
 125
 126         # check version of N2VC
 127         # TODO enhance with int conversion or from distutils.version import LooseVersion
 128         # or with list(map(int, version.split(".")))
 129         if versiontuple(n2vc_version) < versiontuple(min_n2vc_version):
 130             raise LcmException("Not compatible osm/N2VC version '{}'. Needed '{}' or higher".format(
 131                 n2vc_version, min_n2vc_version))
 132         # check version of common
 133         if versiontuple(common_version) < versiontuple(min_common_version):
 134             raise LcmException("Not compatible osm/common version '{}'. Needed '{}' or higher".format(
 135                 common_version, min_common_version))
 136
 137         try:
 138             # TODO check database version
 139             if config["database"]["driver"] == "mongo":
 140                 self.db = dbmongo.DbMongo()
 141                 self.db.db_connect(config["database"])
 142             elif config["database"]["driver"] == "memory":
 143                 self.db = dbmemory.DbMemory()
 144                 self.db.db_connect(config["database"])
 145             else:
 146                 raise LcmException("Invalid configuration param '{}' at '[database]':'driver'".format(
 147                     config["database"]["driver"]))
 148
 149             if config["storage"]["driver"] == "local":
 150                 self.fs = fslocal.FsLocal()
 151                 self.fs.fs_connect(config["storage"])
 152             else:
 153                 raise LcmException("Invalid configuration param '{}' at '[storage]':'driver'".format(
 154                     config["storage"]["driver"]))
 155
 156             config_message = config["message"].copy()
 157             config_message["loop"] = self.loop
 158             if config_message["driver"] == "local":
 159                 self.msg = msglocal.MsgLocal()
 160                 self.msg.connect(config_message)
 161                 self.msg_admin = msglocal.MsgLocal()
 162                 config_message.pop("group_id", None)
 163                 self.msg_admin.connect(config_message)
 164             elif config_message["driver"] == "kafka":
 165                 self.msg = msgkafka.MsgKafka()
 166                 self.msg.connect(config_message)
 167                 self.msg_admin = msgkafka.MsgKafka()
 168                 config_message.pop("group_id", None)
 169                 self.msg_admin.connect(config_message)
 170             else:
 171                 raise LcmException("Invalid configuration param '{}' at '[message]':'driver'".format(
 172                     config["message"]["driver"]))
 173         except (DbException, FsException, MsgException) as e:
 174             self.logger.critical(str(e), exc_info=True)
 175             raise LcmException(str(e))
 176
 177         self.ns = ns.NsLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.vca_config, self.loop)
 178         self.netslice = netslice.NetsliceLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config,
 179                                              self.vca_config, self.loop)
 180         self.vim = vim_sdn.VimLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 181         self.wim = vim_sdn.WimLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 182         self.sdn = vim_sdn.SdnLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 183
 184     async def check_RO_version(self):
 185         try:
 186             RO = ROclient.ROClient(self.loop, **self.ro_config)
 187             RO_version = await RO.get_version()
 188             if RO_version < min_RO_version:
 189                 raise LcmException("Not compatible osm/RO version '{}.{}.{}'. Needed '{}.{}.{}' or higher".format(
 190                     *RO_version, *min_RO_version
 191                 ))
 192         except ROclient.ROClientException as e:
 193             error_text = "Error while conneting to osm/RO " + str(e)
 194             self.logger.critical(error_text, exc_info=True)
 195             raise LcmException(error_text)
 196
 197     async def test(self, param=None):
 198         self.logger.debug("Starting/Ending test task: {}".format(param))
 199
 200     async def kafka_ping(self):
 201         self.logger.debug("Task kafka_ping Enter")
 202         consecutive_errors = 0
 203         first_start = True
 204         kafka_has_received = False
 205         self.pings_not_received = 1
 206         while True:
 207             try:
 208                 await self.msg_admin.aiowrite(
 209                     "admin", "ping",
 210                     {"from": "lcm", "to": "lcm", "worker_id": self.worker_id, "version": lcm_version},
 211                     self.loop)
 212                 # time between pings are low when it is not received and at starting
 213                 wait_time = self.ping_interval_boot if not kafka_has_received else self.ping_interval_pace
 214                 if not self.pings_not_received:
 215                     kafka_has_received = True
 216                 self.pings_not_received += 1
 217                 await asyncio.sleep(wait_time, loop=self.loop)
 218                 if self.pings_not_received > 10:
 219                     raise LcmException("It is not receiving pings from Kafka bus")
 220                 consecutive_errors = 0
 221                 first_start = False
 222             except LcmException:
 223                 raise
 224             except Exception as e:
 225                 # if not first_start is the first time after starting. So leave more time and wait
 226                 # to allow kafka starts
 227                 if consecutive_errors == 8 if not first_start else 30:
 228                     self.logger.error("Task kafka_read task exit error too many errors. Exception: {}".format(e))
 229                     raise
 230                 consecutive_errors += 1
 231                 self.logger.error("Task kafka_read retrying after Exception {}".format(e))
 232                 wait_time = 2 if not first_start else 5
 233                 await asyncio.sleep(wait_time, loop=self.loop)
 234
 235     def kafka_read_callback(self, topic, command, params):
 236         order_id = 1
 237
 238         if topic != "admin" and command != "ping":
 239             self.logger.debug("Task kafka_read receives {} {}: {}".format(topic, command, params))
 240         self.consecutive_errors = 0
 241         self.first_start = False
 242         order_id += 1
 243         if command == "exit":
 244             raise LcmExceptionExit
 245         elif command.startswith("#"):
 246             return
 247         elif command == "echo":
 248             # just for test
 249             print(params)
 250             sys.stdout.flush()
 251             return
 252         elif command == "test":
 253             asyncio.Task(self.test(params), loop=self.loop)
 254             return
 255
 256         if topic == "admin":
 257             if command == "ping" and params["to"] == "lcm" and params["from"] == "lcm":
 258                 if params.get("worker_id") != self.worker_id:
 259                     return
 260                 self.pings_not_received = 0
 261                 try:
 262                     with open(health_check_file, "w") as f:
 263                         f.write(str(time()))
 264                 except Exception as e:
 265                     self.logger.error("Cannot write into '{}' for healthcheck: {}".format(health_check_file, e))
 266             return
 267         elif topic == "ns":
 268             if command == "instantiate":
 269                 # self.logger.debug("Deploying NS {}".format(nsr_id))
 270                 nslcmop = params
 271                 nslcmop_id = nslcmop["_id"]
 272                 nsr_id = nslcmop["nsInstanceId"]
 273                 task = asyncio.ensure_future(self.ns.instantiate(nsr_id, nslcmop_id))
 274                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_instantiate", task)
 275                 return
 276             elif command == "terminate":
 277                 # self.logger.debug("Deleting NS {}".format(nsr_id))
 278                 nslcmop = params
 279                 nslcmop_id = nslcmop["_id"]
 280                 nsr_id = nslcmop["nsInstanceId"]
 281                 self.lcm_tasks.cancel(topic, nsr_id)
 282                 task = asyncio.ensure_future(self.ns.terminate(nsr_id, nslcmop_id))
 283                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_terminate", task)
 284                 return
 285             elif command == "action":
 286                 # self.logger.debug("Update NS {}".format(nsr_id))
 287                 nslcmop = params
 288                 nslcmop_id = nslcmop["_id"]
 289                 nsr_id = nslcmop["nsInstanceId"]
 290                 task = asyncio.ensure_future(self.ns.action(nsr_id, nslcmop_id))
 291                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_action", task)
 292                 return
 293             elif command == "scale":
 294                 # self.logger.debug("Update NS {}".format(nsr_id))
 295                 nslcmop = params
 296                 nslcmop_id = nslcmop["_id"]
 297                 nsr_id = nslcmop["nsInstanceId"]
 298                 task = asyncio.ensure_future(self.ns.scale(nsr_id, nslcmop_id))
 299                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_scale", task)
 300                 return
 301             elif command == "show":
 302                 nsr_id = params
 303                 try:
 304                     db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
 305                     print("nsr:\n    _id={}\n    operational-status: {}\n    config-status: {}"
 306                           "\n    detailed-status: {}\n    deploy: {}\n    tasks: {}"
 307                           "".format(nsr_id, db_nsr["operational-status"], db_nsr["config-status"],
 308                                     db_nsr["detailed-status"],
 309                                     db_nsr["_admin"]["deployed"], self.lcm_ns_tasks.get(nsr_id)))
 310                 except Exception as e:
 311                     print("nsr {} not found: {}".format(nsr_id, e))
 312                 sys.stdout.flush()
 313                 return
 314             elif command == "deleted":
 315                 return  # TODO cleaning of task just in case should be done
 316             elif command in ("terminated", "instantiated", "scaled", "actioned"):  # "scaled-cooldown-time"
 317                 return
 318         elif topic == "nsi":  # netslice LCM processes (instantiate, terminate, etc)
 319             if command == "instantiate":
 320                 # self.logger.debug("Instantiating Network Slice {}".format(nsilcmop["netsliceInstanceId"]))
 321                 nsilcmop = params
 322                 nsilcmop_id = nsilcmop["_id"]  # slice operation id
 323                 nsir_id = nsilcmop["netsliceInstanceId"]  # slice record id
 324                 task = asyncio.ensure_future(self.netslice.instantiate(nsir_id, nsilcmop_id))
 325                 self.lcm_tasks.register("nsi", nsir_id, nsilcmop_id, "nsi_instantiate", task)
 326                 return
 327             elif command == "terminate":
 328                 # self.logger.debug("Terminating Network Slice NS {}".format(nsilcmop["netsliceInstanceId"]))
 329                 nsilcmop = params
 330                 nsilcmop_id = nsilcmop["_id"]  # slice operation id
 331                 nsir_id = nsilcmop["netsliceInstanceId"]  # slice record id
 332                 self.lcm_tasks.cancel(topic, nsir_id)
 333                 task = asyncio.ensure_future(self.netslice.terminate(nsir_id, nsilcmop_id))
 334                 self.lcm_tasks.register("nsi", nsir_id, nsilcmop_id, "nsi_terminate", task)
 335                 return
 336             elif command == "show":
 337                 nsir_id = params
 338                 try:
 339                     db_nsir = self.db.get_one("nsirs", {"_id": nsir_id})
 340                     print("nsir:\n    _id={}\n    operational-status: {}\n    config-status: {}"
 341                           "\n    detailed-status: {}\n    deploy: {}\n    tasks: {}"
 342                           "".format(nsir_id, db_nsir["operational-status"], db_nsir["config-status"],
 343                                     db_nsir["detailed-status"],
 344                                     db_nsir["_admin"]["deployed"], self.lcm_netslice_tasks.get(nsir_id)))
 345                 except Exception as e:
 346                     print("nsir {} not found: {}".format(nsir_id, e))
 347                 sys.stdout.flush()
 348                 return
 349             elif command == "deleted":
 350                 return  # TODO cleaning of task just in case should be done
 351             elif command in ("terminated", "instantiated", "scaled", "actioned"):  # "scaled-cooldown-time"
 352                 return
 353         elif topic == "vim_account":
 354             vim_id = params["_id"]
 355             if command == "create":
 356                 task = asyncio.ensure_future(self.vim.create(params, order_id))
 357                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_create", task)
 358                 return
 359             elif command == "delete":
 360                 self.lcm_tasks.cancel(topic, vim_id)
 361                 task = asyncio.ensure_future(self.vim.delete(vim_id, order_id))
 362                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_delete", task)
 363                 return
 364             elif command == "show":
 365                 print("not implemented show with vim_account")
 366                 sys.stdout.flush()
 367                 return
 368             elif command == "edit":
 369                 task = asyncio.ensure_future(self.vim.edit(params, order_id))
 370                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_edit", task)
 371                 return
 372         elif topic == "wim_account":
 373             wim_id = params["_id"]
 374             if command == "create":
 375                 task = asyncio.ensure_future(self.wim.create(params, order_id))
 376                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_create", task)
 377                 return
 378             elif command == "delete":
 379                 self.lcm_tasks.cancel(topic, wim_id)
 380                 task = asyncio.ensure_future(self.wim.delete(wim_id, order_id))
 381                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_delete", task)
 382                 return
 383             elif command == "show":
 384                 print("not implemented show with wim_account")
 385                 sys.stdout.flush()
 386                 return
 387             elif command == "edit":
 388                 task = asyncio.ensure_future(self.wim.edit(params, order_id))
 389                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_edit", task)
 390                 return
 391         elif topic == "sdn":
 392             _sdn_id = params["_id"]
 393             if command == "create":
 394                 task = asyncio.ensure_future(self.sdn.create(params, order_id))
 395                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_create", task)
 396                 return
 397             elif command == "delete":
 398                 self.lcm_tasks.cancel(topic, _sdn_id)
 399                 task = asyncio.ensure_future(self.sdn.delete(_sdn_id, order_id))
 400                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_delete", task)
 401                 return
 402             elif command == "edit":
 403                 task = asyncio.ensure_future(self.sdn.edit(params, order_id))
 404                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_edit", task)
 405                 return
 406         self.logger.critical("unknown topic {} and command '{}'".format(topic, command))
 407
 408     async def kafka_read(self):
 409         self.logger.debug("Task kafka_read Enter with worker_id={}".format(self.worker_id))
 410         # future = asyncio.Future()
 411         self.consecutive_errors = 0
 412         self.first_start = True
 413         while self.consecutive_errors < 10:
 414             try:
 415                 topics = ("ns", "vim_account", "wim_account", "sdn", "nsi")
 416                 topics_admin = ("admin", )
 417                 await asyncio.gather(
 418                     self.msg.aioread(topics, self.loop, self.kafka_read_callback),
 419                     self.msg_admin.aioread(topics_admin, self.loop, self.kafka_read_callback, group_id=False)
 420                 )
 421
 422             except LcmExceptionExit:
 423                 self.logger.debug("Bye!")
 424                 break
 425             except Exception as e:
 426                 # if not first_start is the first time after starting. So leave more time and wait
 427                 # to allow kafka starts
 428                 if self.consecutive_errors == 8 if not self.first_start else 30:
 429                     self.logger.error("Task kafka_read task exit error too many errors. Exception: {}".format(e))
 430                     raise
 431                 self.consecutive_errors += 1
 432                 self.logger.error("Task kafka_read retrying after Exception {}".format(e))
 433                 wait_time = 2 if not self.first_start else 5
 434                 await asyncio.sleep(wait_time, loop=self.loop)
 435
 436         # self.logger.debug("Task kafka_read terminating")
 437         self.logger.debug("Task kafka_read exit")
 438
 439     def start(self):
 440
 441         # check RO version
 442         self.loop.run_until_complete(self.check_RO_version())
 443
 444         self.loop.run_until_complete(asyncio.gather(
 445             self.kafka_read(),
 446             self.kafka_ping()
 447         ))
 448         # TODO
 449         # self.logger.debug("Terminating cancelling creation tasks")
 450         # self.lcm_tasks.cancel("ALL", "create")
 451         # timeout = 200
 452         # while self.is_pending_tasks():
 453         #     self.logger.debug("Task kafka_read terminating. Waiting for tasks termination")
 454         #     await asyncio.sleep(2, loop=self.loop)
 455         #     timeout -= 2
 456         #     if not timeout:
 457         #         self.lcm_tasks.cancel("ALL", "ALL")
 458         self.loop.close()
 459         self.loop = None
 460         if self.db:
 461             self.db.db_disconnect()
 462         if self.msg:
 463             self.msg.disconnect()
 464         if self.msg_admin:
 465             self.msg_admin.disconnect()
 466         if self.fs:
 467             self.fs.fs_disconnect()
 468
 469     def read_config_file(self, config_file):
 470         # TODO make a [ini] + yaml inside parser
 471         # the configparser library is not suitable, because it does not admit comments at the end of line,
 472         # and not parse integer or boolean
 473         try:
 474             with open(config_file) as f:
 475                 conf = yaml.load(f)
 476             for k, v in environ.items():
 477                 if not k.startswith("OSMLCM_"):
 478                     continue
 479                 k_items = k.lower().split("_")
 480                 if len(k_items) < 3:
 481                     continue
 482                 if k_items[1] in ("ro", "vca"):
 483                     # put in capital letter
 484                     k_items[1] = k_items[1].upper()
 485                 c = conf
 486                 try:
 487                     for k_item in k_items[1:-1]:
 488                         c = c[k_item]
 489                     if k_items[-1] == "port":
 490                         c[k_items[-1]] = int(v)
 491                     else:
 492                         c[k_items[-1]] = v
 493                 except Exception as e:
 494                     self.logger.warn("skipping environ '{}' on exception '{}'".format(k, e))
 495
 496             return conf
 497         except Exception as e:
 498             self.logger.critical("At config file '{}': {}".format(config_file, e))
 499             exit(1)
 500
 501     @staticmethod
 502     def get_process_id():
 503         """
 504         Obtain a unique ID for this process. If running from inside docker, it will get docker ID. If not it
 505         will provide a random one
 506         :return: Obtained ID
 507         """
 508         # Try getting docker id. If fails, get pid
 509         try:
 510             with open("/proc/self/cgroup", "r") as f:
 511                 text_id_ = f.readline()
 512                 _, _, text_id = text_id_.rpartition("/")
 513                 text_id = text_id.replace('\n', '')[:12]
 514                 if text_id:
 515                     return text_id
 516         except Exception:
 517             pass
 518         # Return a random id
 519         return ''.join(random_choice("0123456789abcdef") for _ in range(12))
 520
 521
 522 def usage():
 523     print("""Usage: {} [options]
 524         -c|--config [configuration_file]: loads the configuration file (default: ./nbi.cfg)
 525         --health-check: do not run lcm, but inspect kafka bus to determine if lcm is healthy
 526         -h|--help: shows this help
 527         """.format(sys.argv[0]))
 528     # --log-socket-host HOST: send logs to this host")
 529     # --log-socket-port PORT: send logs using this port (default: 9022)")
 530
 531
 532 def health_check():
 533     retry = 2
 534     while retry:
 535         retry -= 1
 536         try:
 537             with open(health_check_file, "r") as f:
 538                 last_received_ping = f.read()
 539
 540             if time() - float(last_received_ping) < Lcm.ping_interval_pace + 10:
 541                 exit(0)
 542         except Exception:
 543             pass
 544         if retry:
 545             sleep(6)
 546     exit(1)
 547
 548
 549 if __name__ == '__main__':
 550     try:
 551         # load parameters and configuration
 552         opts, args = getopt.getopt(sys.argv[1:], "hc:", ["config=", "help", "health-check"])
 553         # TODO add  "log-socket-host=", "log-socket-port=", "log-file="
 554         config_file = None
 555         for o, a in opts:
 556             if o in ("-h", "--help"):
 557                 usage()
 558                 sys.exit()
 559             elif o in ("-c", "--config"):
 560                 config_file = a
 561             elif o == "--health-check":
 562                 health_check()
 563             # elif o == "--log-socket-port":
 564             #     log_socket_port = a
 565             # elif o == "--log-socket-host":
 566             #     log_socket_host = a
 567             # elif o == "--log-file":
 568             #     log_file = a
 569             else:
 570                 assert False, "Unhandled option"
 571         if config_file:
 572             if not path.isfile(config_file):
 573                 print("configuration file '{}' not exist".format(config_file), file=sys.stderr)
 574                 exit(1)
 575         else:
 576             for config_file in (__file__[:__file__.rfind(".")] + ".cfg", "./lcm.cfg", "/etc/osm/lcm.cfg"):
 577                 if path.isfile(config_file):
 578                     break
 579             else:
 580                 print("No configuration file 'lcm.cfg' found neither at local folder nor at /etc/osm/", file=sys.stderr)
 581                 exit(1)
 582         lcm = Lcm(config_file)
 583         lcm.start()
 584     except (LcmException, getopt.GetoptError) as e:
 585         print(str(e), file=sys.stderr)
 586         # usage()
 587         exit(1)