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
  27 from osm_lcm import ROclient, ns, vim_sdn, netslice
  28 from time import time, sleep
  29 from osm_lcm.lcm_utils import versiontuple, LcmException, TaskRegistry, LcmExceptionExit
  30 from osm_lcm import version as lcm_version, version_date as lcm_version_date
  31
  32 from osm_common import dbmemory, dbmongo, fslocal, msglocal, msgkafka
  33 from osm_common import version as common_version
  34 from osm_common.dbbase import DbException
  35 from osm_common.fsbase import FsException
  36 from osm_common.msgbase import MsgException
  37 from os import environ, path
  38 from random import choice as random_choice
  39 from n2vc import version as n2vc_version
  40
  41
  42 __author__ = "Alfonso Tierno"
  43 min_RO_version = "0.6.3"
  44 min_n2vc_version = "0.0.2"
  45 min_common_version = "0.1.19"
  46 # uncomment if LCM is installed as library and installed, and get them from __init__.py
  47 # lcm_version = '0.1.41'
  48 # lcm_version_date = '2019-06-19'
  49 health_check_file = path.expanduser("~") + "/time_last_ping"   # TODO find better location for this file
  50
  51
  52 class Lcm:
  53
  54     ping_interval_pace = 120  # how many time ping is send once is confirmed all is running
  55     ping_interval_boot = 5    # how many time ping is sent when booting
  56
  57     def __init__(self, config_file, loop=None):
  58         """
  59         Init, Connect to database, filesystem storage, and messaging
  60         :param config: two level dictionary with configuration. Top level should contain 'database', 'storage',
  61         :return: None
  62         """
  63
  64         self.db = None
  65         self.msg = None
  66         self.msg_admin = None
  67         self.fs = None
  68         self.pings_not_received = 1
  69         self.consecutive_errors = 0
  70         self.first_start = False
  71
  72         # logging
  73         self.logger = logging.getLogger('lcm')
  74         # get id
  75         self.worker_id = self.get_process_id()
  76         # load configuration
  77         config = self.read_config_file(config_file)
  78         self.config = config
  79         self.ro_config = {
  80             "endpoint_url": "http://{}:{}/openmano".format(config["RO"]["host"], config["RO"]["port"]),
  81             "tenant": config.get("tenant", "osm"),
  82             "logger_name": "lcm.ROclient",
  83             "loglevel": "ERROR",
  84         }
  85
  86         self.vca_config = config["VCA"]
  87
  88         self.loop = loop or asyncio.get_event_loop()
  89
  90         # logging
  91         log_format_simple = "%(asctime)s %(levelname)s %(name)s %(filename)s:%(lineno)s %(message)s"
  92         log_formatter_simple = logging.Formatter(log_format_simple, datefmt='%Y-%m-%dT%H:%M:%S')
  93         config["database"]["logger_name"] = "lcm.db"
  94         config["storage"]["logger_name"] = "lcm.fs"
  95         config["message"]["logger_name"] = "lcm.msg"
  96         if config["global"].get("logfile"):
  97             file_handler = logging.handlers.RotatingFileHandler(config["global"]["logfile"],
  98                                                                 maxBytes=100e6, backupCount=9, delay=0)
  99             file_handler.setFormatter(log_formatter_simple)
 100             self.logger.addHandler(file_handler)
 101         if not config["global"].get("nologging"):
 102             str_handler = logging.StreamHandler()
 103             str_handler.setFormatter(log_formatter_simple)
 104             self.logger.addHandler(str_handler)
 105
 106         if config["global"].get("loglevel"):
 107             self.logger.setLevel(config["global"]["loglevel"])
 108
 109         # logging other modules
 110         for k1, logname in {"message": "lcm.msg", "database": "lcm.db", "storage": "lcm.fs"}.items():
 111             config[k1]["logger_name"] = logname
 112             logger_module = logging.getLogger(logname)
 113             if config[k1].get("logfile"):
 114                 file_handler = logging.handlers.RotatingFileHandler(config[k1]["logfile"],
 115                                                                     maxBytes=100e6, backupCount=9, delay=0)
 116                 file_handler.setFormatter(log_formatter_simple)
 117                 logger_module.addHandler(file_handler)
 118             if config[k1].get("loglevel"):
 119                 logger_module.setLevel(config[k1]["loglevel"])
 120         self.logger.critical("starting osm/lcm version {} {}".format(lcm_version, lcm_version_date))
 121
 122         # check version of N2VC
 123         # TODO enhance with int conversion or from distutils.version import LooseVersion
 124         # or with list(map(int, version.split(".")))
 125         if versiontuple(n2vc_version) < versiontuple(min_n2vc_version):
 126             raise LcmException("Not compatible osm/N2VC version '{}'. Needed '{}' or higher".format(
 127                 n2vc_version, min_n2vc_version))
 128         # check version of common
 129         if versiontuple(common_version) < versiontuple(min_common_version):
 130             raise LcmException("Not compatible osm/common version '{}'. Needed '{}' or higher".format(
 131                 common_version, min_common_version))
 132
 133         try:
 134             # TODO check database version
 135             if config["database"]["driver"] == "mongo":
 136                 self.db = dbmongo.DbMongo()
 137                 self.db.db_connect(config["database"])
 138             elif config["database"]["driver"] == "memory":
 139                 self.db = dbmemory.DbMemory()
 140                 self.db.db_connect(config["database"])
 141             else:
 142                 raise LcmException("Invalid configuration param '{}' at '[database]':'driver'".format(
 143                     config["database"]["driver"]))
 144
 145             if config["storage"]["driver"] == "local":
 146                 self.fs = fslocal.FsLocal()
 147                 self.fs.fs_connect(config["storage"])
 148             else:
 149                 raise LcmException("Invalid configuration param '{}' at '[storage]':'driver'".format(
 150                     config["storage"]["driver"]))
 151
 152             config_message = config["message"].copy()
 153             config_message["loop"] = self.loop
 154             if config_message["driver"] == "local":
 155                 self.msg = msglocal.MsgLocal()
 156                 self.msg.connect(config_message)
 157                 self.msg_admin = msglocal.MsgLocal()
 158                 config_message.pop("group_id", None)
 159                 self.msg_admin.connect(config_message)
 160             elif config_message["driver"] == "kafka":
 161                 self.msg = msgkafka.MsgKafka()
 162                 self.msg.connect(config_message)
 163                 self.msg_admin = msgkafka.MsgKafka()
 164                 config_message.pop("group_id", None)
 165                 self.msg_admin.connect(config_message)
 166             else:
 167                 raise LcmException("Invalid configuration param '{}' at '[message]':'driver'".format(
 168                     config["message"]["driver"]))
 169         except (DbException, FsException, MsgException) as e:
 170             self.logger.critical(str(e), exc_info=True)
 171             raise LcmException(str(e))
 172
 173         # contains created tasks/futures to be able to cancel
 174         self.lcm_tasks = TaskRegistry(self.worker_id, self.db, self.logger)
 175
 176         self.ns = ns.NsLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.vca_config, self.loop)
 177         self.netslice = netslice.NetsliceLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config,
 178                                              self.vca_config, self.loop)
 179         self.vim = vim_sdn.VimLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 180         self.wim = vim_sdn.WimLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 181         self.sdn = vim_sdn.SdnLcm(self.db, self.msg, self.fs, self.lcm_tasks, self.ro_config, self.loop)
 182
 183     async def check_RO_version(self):
 184         try:
 185             RO = ROclient.ROClient(self.loop, **self.ro_config)
 186             RO_version = await RO.get_version()
 187             if versiontuple(RO_version) < versiontuple(min_RO_version):
 188                 raise LcmException("Not compatible osm/RO version '{}.{}.{}'. Needed '{}.{}.{}' or higher".format(
 189                     *RO_version, *min_RO_version
 190                 ))
 191         except ROclient.ROClientException as e:
 192             error_text = "Error while conneting to osm/RO " + str(e)
 193             self.logger.critical(error_text, exc_info=True)
 194             raise LcmException(error_text)
 195
 196     async def test(self, param=None):
 197         self.logger.debug("Starting/Ending test task: {}".format(param))
 198
 199     async def kafka_ping(self):
 200         self.logger.debug("Task kafka_ping Enter")
 201         consecutive_errors = 0
 202         first_start = True
 203         kafka_has_received = False
 204         self.pings_not_received = 1
 205         while True:
 206             try:
 207                 await self.msg_admin.aiowrite(
 208                     "admin", "ping",
 209                     {"from": "lcm", "to": "lcm", "worker_id": self.worker_id, "version": lcm_version},
 210                     self.loop)
 211                 # time between pings are low when it is not received and at starting
 212                 wait_time = self.ping_interval_boot if not kafka_has_received else self.ping_interval_pace
 213                 if not self.pings_not_received:
 214                     kafka_has_received = True
 215                 self.pings_not_received += 1
 216                 await asyncio.sleep(wait_time, loop=self.loop)
 217                 if self.pings_not_received > 10:
 218                     raise LcmException("It is not receiving pings from Kafka bus")
 219                 consecutive_errors = 0
 220                 first_start = False
 221             except LcmException:
 222                 raise
 223             except Exception as e:
 224                 # if not first_start is the first time after starting. So leave more time and wait
 225                 # to allow kafka starts
 226                 if consecutive_errors == 8 if not first_start else 30:
 227                     self.logger.error("Task kafka_read task exit error too many errors. Exception: {}".format(e))
 228                     raise
 229                 consecutive_errors += 1
 230                 self.logger.error("Task kafka_read retrying after Exception {}".format(e))
 231                 wait_time = 2 if not first_start else 5
 232                 await asyncio.sleep(wait_time, loop=self.loop)
 233
 234     def kafka_read_callback(self, topic, command, params):
 235         order_id = 1
 236
 237         if topic != "admin" and command != "ping":
 238             self.logger.debug("Task kafka_read receives {} {}: {}".format(topic, command, params))
 239         self.consecutive_errors = 0
 240         self.first_start = False
 241         order_id += 1
 242         if command == "exit":
 243             raise LcmExceptionExit
 244         elif command.startswith("#"):
 245             return
 246         elif command == "echo":
 247             # just for test
 248             print(params)
 249             sys.stdout.flush()
 250             return
 251         elif command == "test":
 252             asyncio.Task(self.test(params), loop=self.loop)
 253             return
 254
 255         if topic == "admin":
 256             if command == "ping" and params["to"] == "lcm" and params["from"] == "lcm":
 257                 if params.get("worker_id") != self.worker_id:
 258                     return
 259                 self.pings_not_received = 0
 260                 try:
 261                     with open(health_check_file, "w") as f:
 262                         f.write(str(time()))
 263                 except Exception as e:
 264                     self.logger.error("Cannot write into '{}' for healthcheck: {}".format(health_check_file, e))
 265             return
 266         elif topic == "ns":
 267             if command == "instantiate":
 268                 # self.logger.debug("Deploying NS {}".format(nsr_id))
 269                 nslcmop = params
 270                 nslcmop_id = nslcmop["_id"]
 271                 nsr_id = nslcmop["nsInstanceId"]
 272                 task = asyncio.ensure_future(self.ns.instantiate(nsr_id, nslcmop_id))
 273                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_instantiate", task)
 274                 return
 275             elif command == "terminate":
 276                 # self.logger.debug("Deleting NS {}".format(nsr_id))
 277                 nslcmop = params
 278                 nslcmop_id = nslcmop["_id"]
 279                 nsr_id = nslcmop["nsInstanceId"]
 280                 self.lcm_tasks.cancel(topic, nsr_id)
 281                 task = asyncio.ensure_future(self.ns.terminate(nsr_id, nslcmop_id))
 282                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_terminate", task)
 283                 return
 284             elif command == "action":
 285                 # self.logger.debug("Update NS {}".format(nsr_id))
 286                 nslcmop = params
 287                 nslcmop_id = nslcmop["_id"]
 288                 nsr_id = nslcmop["nsInstanceId"]
 289                 task = asyncio.ensure_future(self.ns.action(nsr_id, nslcmop_id))
 290                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_action", task)
 291                 return
 292             elif command == "scale":
 293                 # self.logger.debug("Update NS {}".format(nsr_id))
 294                 nslcmop = params
 295                 nslcmop_id = nslcmop["_id"]
 296                 nsr_id = nslcmop["nsInstanceId"]
 297                 task = asyncio.ensure_future(self.ns.scale(nsr_id, nslcmop_id))
 298                 self.lcm_tasks.register("ns", nsr_id, nslcmop_id, "ns_scale", task)
 299                 return
 300             elif command == "show":
 301                 nsr_id = params
 302                 try:
 303                     db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
 304                     print("nsr:\n    _id={}\n    operational-status: {}\n    config-status: {}"
 305                           "\n    detailed-status: {}\n    deploy: {}\n    tasks: {}"
 306                           "".format(nsr_id, db_nsr["operational-status"], db_nsr["config-status"],
 307                                     db_nsr["detailed-status"],
 308                                     db_nsr["_admin"]["deployed"], self.lcm_ns_tasks.get(nsr_id)))
 309                 except Exception as e:
 310                     print("nsr {} not found: {}".format(nsr_id, e))
 311                 sys.stdout.flush()
 312                 return
 313             elif command == "deleted":
 314                 return  # TODO cleaning of task just in case should be done
 315             elif command in ("terminated", "instantiated", "scaled", "actioned"):  # "scaled-cooldown-time"
 316                 return
 317         elif topic == "nsi":  # netslice LCM processes (instantiate, terminate, etc)
 318             if command == "instantiate":
 319                 # self.logger.debug("Instantiating Network Slice {}".format(nsilcmop["netsliceInstanceId"]))
 320                 nsilcmop = params
 321                 nsilcmop_id = nsilcmop["_id"]  # slice operation id
 322                 nsir_id = nsilcmop["netsliceInstanceId"]  # slice record id
 323                 task = asyncio.ensure_future(self.netslice.instantiate(nsir_id, nsilcmop_id))
 324                 self.lcm_tasks.register("nsi", nsir_id, nsilcmop_id, "nsi_instantiate", task)
 325                 return
 326             elif command == "terminate":
 327                 # self.logger.debug("Terminating Network Slice NS {}".format(nsilcmop["netsliceInstanceId"]))
 328                 nsilcmop = params
 329                 nsilcmop_id = nsilcmop["_id"]  # slice operation id
 330                 nsir_id = nsilcmop["netsliceInstanceId"]  # slice record id
 331                 self.lcm_tasks.cancel(topic, nsir_id)
 332                 task = asyncio.ensure_future(self.netslice.terminate(nsir_id, nsilcmop_id))
 333                 self.lcm_tasks.register("nsi", nsir_id, nsilcmop_id, "nsi_terminate", task)
 334                 return
 335             elif command == "show":
 336                 nsir_id = params
 337                 try:
 338                     db_nsir = self.db.get_one("nsirs", {"_id": nsir_id})
 339                     print("nsir:\n    _id={}\n    operational-status: {}\n    config-status: {}"
 340                           "\n    detailed-status: {}\n    deploy: {}\n    tasks: {}"
 341                           "".format(nsir_id, db_nsir["operational-status"], db_nsir["config-status"],
 342                                     db_nsir["detailed-status"],
 343                                     db_nsir["_admin"]["deployed"], self.lcm_netslice_tasks.get(nsir_id)))
 344                 except Exception as e:
 345                     print("nsir {} not found: {}".format(nsir_id, e))
 346                 sys.stdout.flush()
 347                 return
 348             elif command == "deleted":
 349                 return  # TODO cleaning of task just in case should be done
 350             elif command in ("terminated", "instantiated", "scaled", "actioned"):  # "scaled-cooldown-time"
 351                 return
 352         elif topic == "vim_account":
 353             vim_id = params["_id"]
 354             if command == "create":
 355                 task = asyncio.ensure_future(self.vim.create(params, order_id))
 356                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_create", task)
 357                 return
 358             elif command == "delete":
 359                 self.lcm_tasks.cancel(topic, vim_id)
 360                 task = asyncio.ensure_future(self.vim.delete(params, order_id))
 361                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_delete", task)
 362                 return
 363             elif command == "show":
 364                 print("not implemented show with vim_account")
 365                 sys.stdout.flush()
 366                 return
 367             elif command == "edit":
 368                 task = asyncio.ensure_future(self.vim.edit(params, order_id))
 369                 self.lcm_tasks.register("vim_account", vim_id, order_id, "vim_edit", task)
 370                 return
 371         elif topic == "wim_account":
 372             wim_id = params["_id"]
 373             if command == "create":
 374                 task = asyncio.ensure_future(self.wim.create(params, order_id))
 375                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_create", task)
 376                 return
 377             elif command == "delete":
 378                 self.lcm_tasks.cancel(topic, wim_id)
 379                 task = asyncio.ensure_future(self.wim.delete(params, order_id))
 380                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_delete", task)
 381                 return
 382             elif command == "show":
 383                 print("not implemented show with wim_account")
 384                 sys.stdout.flush()
 385                 return
 386             elif command == "edit":
 387                 task = asyncio.ensure_future(self.wim.edit(params, order_id))
 388                 self.lcm_tasks.register("wim_account", wim_id, order_id, "wim_edit", task)
 389                 return
 390         elif topic == "sdn":
 391             _sdn_id = params["_id"]
 392             if command == "create":
 393                 task = asyncio.ensure_future(self.sdn.create(params, order_id))
 394                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_create", task)
 395                 return
 396             elif command == "delete":
 397                 self.lcm_tasks.cancel(topic, _sdn_id)
 398                 task = asyncio.ensure_future(self.sdn.delete(params, order_id))
 399                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_delete", task)
 400                 return
 401             elif command == "edit":
 402                 task = asyncio.ensure_future(self.sdn.edit(params, order_id))
 403                 self.lcm_tasks.register("sdn", _sdn_id, order_id, "sdn_edit", task)
 404                 return
 405         self.logger.critical("unknown topic {} and command '{}'".format(topic, command))
 406
 407     async def kafka_read(self):
 408         self.logger.debug("Task kafka_read Enter with worker_id={}".format(self.worker_id))
 409         # future = asyncio.Future()
 410         self.consecutive_errors = 0
 411         self.first_start = True
 412         while self.consecutive_errors < 10:
 413             try:
 414                 topics = ("ns", "vim_account", "wim_account", "sdn", "nsi")
 415                 topics_admin = ("admin", )
 416                 await asyncio.gather(
 417                     self.msg.aioread(topics, self.loop, self.kafka_read_callback),
 418                     self.msg_admin.aioread(topics_admin, self.loop, self.kafka_read_callback, group_id=False)
 419                 )
 420
 421             except LcmExceptionExit:
 422                 self.logger.debug("Bye!")
 423                 break
 424             except Exception as e:
 425                 # if not first_start is the first time after starting. So leave more time and wait
 426                 # to allow kafka starts
 427                 if self.consecutive_errors == 8 if not self.first_start else 30:
 428                     self.logger.error("Task kafka_read task exit error too many errors. Exception: {}".format(e))
 429                     raise
 430                 self.consecutive_errors += 1
 431                 self.logger.error("Task kafka_read retrying after Exception {}".format(e))
 432                 wait_time = 2 if not self.first_start else 5
 433                 await asyncio.sleep(wait_time, loop=self.loop)
 434
 435         # self.logger.debug("Task kafka_read terminating")
 436         self.logger.debug("Task kafka_read exit")
 437
 438     def start(self):
 439
 440         # check RO version
 441         self.loop.run_until_complete(self.check_RO_version())
 442
 443         self.loop.run_until_complete(asyncio.gather(
 444             self.kafka_read(),
 445             self.kafka_ping()
 446         ))
 447         # TODO
 448         # self.logger.debug("Terminating cancelling creation tasks")
 449         # self.lcm_tasks.cancel("ALL", "create")
 450         # timeout = 200
 451         # while self.is_pending_tasks():
 452         #     self.logger.debug("Task kafka_read terminating. Waiting for tasks termination")
 453         #     await asyncio.sleep(2, loop=self.loop)
 454         #     timeout -= 2
 455         #     if not timeout:
 456         #         self.lcm_tasks.cancel("ALL", "ALL")
 457         self.loop.close()
 458         self.loop = None
 459         if self.db:
 460             self.db.db_disconnect()
 461         if self.msg:
 462             self.msg.disconnect()
 463         if self.msg_admin:
 464             self.msg_admin.disconnect()
 465         if self.fs:
 466             self.fs.fs_disconnect()
 467
 468     def read_config_file(self, config_file):
 469         # TODO make a [ini] + yaml inside parser
 470         # the configparser library is not suitable, because it does not admit comments at the end of line,
 471         # and not parse integer or boolean
 472         try:
 473             with open(config_file) as f:
 474                 conf = yaml.load(f)
 475             for k, v in environ.items():
 476                 if not k.startswith("OSMLCM_"):
 477                     continue
 478                 k_items = k.lower().split("_")
 479                 if len(k_items) < 3:
 480                     continue
 481                 if k_items[1] in ("ro", "vca"):
 482                     # put in capital letter
 483                     k_items[1] = k_items[1].upper()
 484                 c = conf
 485                 try:
 486                     for k_item in k_items[1:-1]:
 487                         c = c[k_item]
 488                     if k_items[-1] == "port":
 489                         c[k_items[-1]] = int(v)
 490                     else:
 491                         c[k_items[-1]] = v
 492                 except Exception as e:
 493                     self.logger.warn("skipping environ '{}' on exception '{}'".format(k, e))
 494
 495             return conf
 496         except Exception as e:
 497             self.logger.critical("At config file '{}': {}".format(config_file, e))
 498             exit(1)
 499
 500     @staticmethod
 501     def get_process_id():
 502         """
 503         Obtain a unique ID for this process. If running from inside docker, it will get docker ID. If not it
 504         will provide a random one
 505         :return: Obtained ID
 506         """
 507         # Try getting docker id. If fails, get pid
 508         try:
 509             with open("/proc/self/cgroup", "r") as f:
 510                 text_id_ = f.readline()
 511                 _, _, text_id = text_id_.rpartition("/")
 512                 text_id = text_id.replace('\n', '')[:12]
 513                 if text_id:
 514                     return text_id
 515         except Exception:
 516             pass
 517         # Return a random id
 518         return ''.join(random_choice("0123456789abcdef") for _ in range(12))
 519
 520
 521 def usage():
 522     print("""Usage: {} [options]
 523         -c|--config [configuration_file]: loads the configuration file (default: ./nbi.cfg)
 524         --health-check: do not run lcm, but inspect kafka bus to determine if lcm is healthy
 525         -h|--help: shows this help
 526         """.format(sys.argv[0]))
 527     # --log-socket-host HOST: send logs to this host")
 528     # --log-socket-port PORT: send logs using this port (default: 9022)")
 529
 530
 531 def health_check():
 532     retry = 2
 533     while retry:
 534         retry -= 1
 535         try:
 536             with open(health_check_file, "r") as f:
 537                 last_received_ping = f.read()
 538
 539             if time() - float(last_received_ping) < Lcm.ping_interval_pace + 10:
 540                 exit(0)
 541         except Exception:
 542             pass
 543         if retry:
 544             sleep(6)
 545     exit(1)
 546
 547
 548 if __name__ == '__main__':
 549     try:
 550         # load parameters and configuration
 551         opts, args = getopt.getopt(sys.argv[1:], "hc:", ["config=", "help", "health-check"])
 552         # TODO add  "log-socket-host=", "log-socket-port=", "log-file="
 553         config_file = None
 554         for o, a in opts:
 555             if o in ("-h", "--help"):
 556                 usage()
 557                 sys.exit()
 558             elif o in ("-c", "--config"):
 559                 config_file = a
 560             elif o == "--health-check":
 561                 health_check()
 562             # elif o == "--log-socket-port":
 563             #     log_socket_port = a
 564             # elif o == "--log-socket-host":
 565             #     log_socket_host = a
 566             # elif o == "--log-file":
 567             #     log_file = a
 568             else:
 569                 assert False, "Unhandled option"
 570         if config_file:
 571             if not path.isfile(config_file):
 572                 print("configuration file '{}' not exist".format(config_file), file=sys.stderr)
 573                 exit(1)
 574         else:
 575             for config_file in (__file__[:__file__.rfind(".")] + ".cfg", "./lcm.cfg", "/etc/osm/lcm.cfg"):
 576                 if path.isfile(config_file):
 577                     break
 578             else:
 579                 print("No configuration file 'lcm.cfg' found neither at local folder nor at /etc/osm/", file=sys.stderr)
 580                 exit(1)
 581         lcm = Lcm(config_file)
 582         lcm.start()
 583     except (LcmException, getopt.GetoptError) as e:
 584         print(str(e), file=sys.stderr)
 585         # usage()
 586         exit(1)