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