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# -*- coding: utf-8 -*- |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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""" |
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This module implements a thread that reads from kafka bus reading VIM messages. |
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It is based on asyncio. |
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It is in charge of load tasks assigned to VIMs that nobody is in chage of it |
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""" |
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|
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import asyncio |
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from http import HTTPStatus |
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import logging |
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import threading |
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from time import time |
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|
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from osm_common import dbmemory, dbmongo, msgkafka, msglocal |
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from osm_common.dbbase import DbException |
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from osm_common.msgbase import MsgException |
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|
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__author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>" |
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class VimAdminException(Exception): |
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def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST): |
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self.http_code = http_code |
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Exception.__init__(self, message) |
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|
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|
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class LockRenew: |
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renew_list = [] |
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# ^ static method, common for all RO. Time ordered list of dictionaries with information of locks that needs to |
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# be renewed. The time order is achieved as it is appended at the end |
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|
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def __init__(self, config, logger): |
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""" |
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Constructor of class |
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:param config: configuration parameters of database and messaging |
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""" |
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self.config = config |
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self.logger = logger |
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self.to_terminate = False |
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self.loop = None |
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self.db = None |
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self.task_locked_time = config["global"]["task_locked_time"] |
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self.task_relock_time = config["global"]["task_relock_time"] |
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self.task_max_locked_time = config["global"]["task_max_locked_time"] |
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|
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def start(self, db, loop): |
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self.db = db |
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self.loop = loop |
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|
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@staticmethod |
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def add_lock_object(database_table, database_object, thread_object): |
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""" |
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Insert a task to renew the locking |
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:param database_table: database collection where to maintain the lock |
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:param database_object: database object. '_id' and 'locked_at' are mandatory keys |
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:param thread_object: Thread object that has locked to check if it is alive |
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:return: a locked_object needed for calling remove_lock_object. It will contain uptodya database 'locked_at' |
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""" |
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lock_object = { |
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"table": database_table, |
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"_id": database_object["_id"], |
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"initial_lock_time": database_object["locked_at"], |
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"locked_at": database_object["locked_at"], |
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"thread": thread_object, |
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"unlocked": False, # True when it is not needed any more |
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} |
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LockRenew.renew_list.append(lock_object) |
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|
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return lock_object |
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|
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@staticmethod |
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def remove_lock_object(lock_object): |
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lock_object["unlocked"] = True |
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|
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async def renew_locks(self): |
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while not self.to_terminate: |
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if not self.renew_list: |
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await asyncio.sleep( |
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self.task_locked_time - self.task_relock_time, loop=self.loop |
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) |
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continue |
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|
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lock_object = self.renew_list[0] |
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|
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if ( |
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lock_object["unlocked"] |
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or not lock_object["thread"] |
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or not lock_object["thread"].is_alive() |
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): |
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# task has been finished or locker thread is dead, not needed to re-locked. |
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self.renew_list.pop(0) |
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continue |
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locked_at = lock_object["locked_at"] |
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now = time() |
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time_to_relock = ( |
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locked_at + self.task_locked_time - self.task_relock_time - now |
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) |
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|
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if time_to_relock < 1: |
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if lock_object["initial_lock_time"] + self.task_max_locked_time < now: |
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self.renew_list.pop(0) |
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# re-lock |
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new_locked_at = locked_at + self.task_locked_time |
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|
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try: |
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if self.db.set_one( |
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lock_object["table"], |
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update_dict={ |
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"locked_at": new_locked_at, |
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"modified_at": now, |
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}, |
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q_filter={ |
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"_id": lock_object["_id"], |
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"locked_at": locked_at, |
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}, |
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fail_on_empty=False, |
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): |
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self.logger.debug( |
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"Renew lock for {}.{}".format( |
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lock_object["table"], lock_object["_id"] |
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) |
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) |
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lock_object["locked_at"] = new_locked_at |
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self.renew_list.append(lock_object) |
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else: |
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self.logger.info( |
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"Cannot renew lock for {}.{}".format( |
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lock_object["table"], lock_object["_id"] |
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) |
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) |
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except Exception as e: |
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self.logger.error( |
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"Exception when trying to renew lock for {}.{}: {}".format( |
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lock_object["table"], lock_object["_id"], e |
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) |
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) |
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else: |
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# wait until it is time to re-lock it |
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await asyncio.sleep(time_to_relock, loop=self.loop) |
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|
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def stop(self): |
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# unlock all locked items |
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now = time() |
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|
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for lock_object in self.renew_list: |
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locked_at = lock_object["locked_at"] |
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|
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if not lock_object["unlocked"] or locked_at + self.task_locked_time >= now: |
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self.db.set_one( |
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lock_object["table"], |
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update_dict={"locked_at": 0}, |
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q_filter={"_id": lock_object["_id"], "locked_at": locked_at}, |
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fail_on_empty=False, |
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) |
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|
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class VimAdminThread(threading.Thread): |
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MAX_TIME_UNATTENDED = 600 # 10min |
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TIME_CHECK_UNUSED_VIM = 3600 * 2 # 2h |
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kafka_topics = ("vim_account", "wim_account", "sdn") |
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|
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def __init__(self, config, engine): |
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""" |
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Constructor of class |
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:param config: configuration parameters of database and messaging |
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:param engine: an instance of Engine class, used for deleting instances |
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""" |
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threading.Thread.__init__(self) |
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self.to_terminate = False |
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self.config = config |
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self.db = None |
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self.msg = None |
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self.engine = engine |
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self.loop = None |
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self.last_rotask_time = 0 |
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self.next_check_unused_vim = time() + self.TIME_CHECK_UNUSED_VIM |
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self.logger = logging.getLogger("ro.vimadmin") |
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# asyncio task for receiving vim actions from kafka bus |
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self.aiomain_task_kafka = None |
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# asyncio task for watching ro_tasks not processed by nobody |
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self.aiomain_task_vim = None |
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self.aiomain_task_renew_lock = None |
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# ^asyncio task for maintain an ro_task locked when VIM plugin takes too much time processing an order |
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self.lock_renew = LockRenew(config, self.logger) |
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self.task_locked_time = config["global"]["task_locked_time"] |
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|
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async def vim_watcher(self): |
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"""Reads database periodically looking for tasks not processed by nobody because of a reboot |
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in order to load this vim""" |
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# firstly read VIMS not processed |
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for target_database in ("vim_accounts", "wim_accounts", "sdns"): |
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unattended_targets = self.db.get_list( |
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target_database, |
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q_filter={"_admin.operations.operationState": "PROCESSING"}, |
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) |
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for target in unattended_targets: |
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target_id = "{}:{}".format(target_database[:3], target["_id"]) |
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self.logger.info("ordered to check {}".format(target_id)) |
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self.engine.check_vim(target_id) |
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|
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while not self.to_terminate: |
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now = time() |
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processed_vims = [] |
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|
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if not self.last_rotask_time: |
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self.last_rotask_time = 0 |
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|
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ro_tasks = self.db.get_list( |
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"ro_tasks", |
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q_filter={ |
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"target_id.ncont": self.engine.get_assigned_vims(), |
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"tasks.status": ["SCHEDULED", "BUILD", "DONE", "FAILED"], |
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"locked_at.lt": now - self.task_locked_time, |
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"to_check_at.gt": self.last_rotask_time, |
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"to_check_at.lte": now - self.MAX_TIME_UNATTENDED, |
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}, |
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) |
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self.last_rotask_time = now - self.MAX_TIME_UNATTENDED |
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|
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for ro_task in ro_tasks: |
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# if already checked ignore |
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if ro_task["target_id"] in processed_vims: |
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continue |
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|
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processed_vims.append(ro_task["target_id"]) |
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|
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# if already assigned ignore |
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if ro_task["target_id"] in self.engine.get_assigned_vims(): |
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continue |
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|
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# if there is some task locked on this VIM, there is an RO working on it, so ignore |
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if self.db.get_list( |
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"ro_tasks", |
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q_filter={ |
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"target_id": ro_task["target_id"], |
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"tasks.status": ["SCHEDULED", "BUILD", "DONE", "FAILED"], |
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"locked_at.gt": now - self.task_locked_time, |
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}, |
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): |
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continue |
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|
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# unattended, assign vim |
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self.engine.assign_vim(ro_task["target_id"]) |
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self.logger.debug( |
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"ordered to load {}. Inactivity detected".format( |
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ro_task["target_id"] |
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) |
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) |
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|
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# every 2 hours check if there are vims without any ro_task and unload it |
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if now > self.next_check_unused_vim: |
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self.next_check_unused_vim = now + self.TIME_CHECK_UNUSED_VIM |
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self.engine.unload_unused_vims() |
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|
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await asyncio.sleep(self.MAX_TIME_UNATTENDED, loop=self.loop) |
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|
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async def aiomain(self): |
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kafka_working = True |
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while not self.to_terminate: |
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try: |
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0 |
if not self.aiomain_task_kafka: |
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# await self.msg.aiowrite("admin", "echo", "dummy message", loop=self.loop) |
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for kafka_topic in self.kafka_topics: |
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await self.msg.aiowrite( |
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kafka_topic, "echo", "dummy message", loop=self.loop |
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) |
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kafka_working = True |
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self.logger.debug("Starting vim_account subscription task") |
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self.aiomain_task_kafka = asyncio.ensure_future( |
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self.msg.aioread( |
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self.kafka_topics, |
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loop=self.loop, |
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group_id=False, |
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aiocallback=self._msg_callback, |
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), |
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loop=self.loop, |
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) |
| 294 |
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|
| 295 |
0 |
if not self.aiomain_task_vim: |
| 296 |
0 |
self.aiomain_task_vim = asyncio.ensure_future( |
| 297 |
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self.vim_watcher(), loop=self.loop |
| 298 |
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) |
| 299 |
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|
| 300 |
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if not self.aiomain_task_renew_lock: |
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0 |
self.aiomain_task_renew_lock = asyncio.ensure_future( |
| 302 |
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self.lock_renew.renew_locks(), loop=self.loop |
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) |
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|
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done, _ = await asyncio.wait( |
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[ |
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self.aiomain_task_kafka, |
| 308 |
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self.aiomain_task_vim, |
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self.aiomain_task_renew_lock, |
| 310 |
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], |
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timeout=None, |
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loop=self.loop, |
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return_when=asyncio.FIRST_COMPLETED, |
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) |
| 315 |
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|
| 316 |
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try: |
| 317 |
0 |
if self.aiomain_task_kafka in done: |
| 318 |
0 |
exc = self.aiomain_task_kafka.exception() |
| 319 |
0 |
self.logger.error( |
| 320 |
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"kafka subscription task exception: {}".format(exc) |
| 321 |
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) |
| 322 |
0 |
self.aiomain_task_kafka = None |
| 323 |
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|
| 324 |
0 |
if self.aiomain_task_vim in done: |
| 325 |
0 |
exc = self.aiomain_task_vim.exception() |
| 326 |
0 |
self.logger.error( |
| 327 |
|
"vim_account watcher task exception: {}".format(exc) |
| 328 |
|
) |
| 329 |
0 |
self.aiomain_task_vim = None |
| 330 |
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|
| 331 |
0 |
if self.aiomain_task_renew_lock in done: |
| 332 |
0 |
exc = self.aiomain_task_renew_lock.exception() |
| 333 |
0 |
self.logger.error("renew_locks task exception: {}".format(exc)) |
| 334 |
0 |
self.aiomain_task_renew_lock = None |
| 335 |
0 |
except asyncio.CancelledError: |
| 336 |
0 |
self.logger.exception("asyncio.CancelledError occured.") |
| 337 |
|
|
| 338 |
0 |
except Exception as e: |
| 339 |
0 |
if self.to_terminate: |
| 340 |
0 |
return |
| 341 |
|
|
| 342 |
0 |
if kafka_working: |
| 343 |
|
# logging only first time |
| 344 |
0 |
self.logger.critical( |
| 345 |
|
"Error accessing kafka '{}'. Retrying ...".format(e) |
| 346 |
|
) |
| 347 |
0 |
kafka_working = False |
| 348 |
|
|
| 349 |
0 |
await asyncio.sleep(10, loop=self.loop) |
| 350 |
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|
| 351 |
1 |
def run(self): |
| 352 |
|
""" |
| 353 |
|
Start of the thread |
| 354 |
|
:return: None |
| 355 |
|
""" |
| 356 |
0 |
self.loop = asyncio.new_event_loop() |
| 357 |
0 |
try: |
| 358 |
0 |
if not self.db: |
| 359 |
0 |
if self.config["database"]["driver"] == "mongo": |
| 360 |
0 |
self.db = dbmongo.DbMongo() |
| 361 |
0 |
self.db.db_connect(self.config["database"]) |
| 362 |
0 |
elif self.config["database"]["driver"] == "memory": |
| 363 |
0 |
self.db = dbmemory.DbMemory() |
| 364 |
0 |
self.db.db_connect(self.config["database"]) |
| 365 |
|
else: |
| 366 |
0 |
raise VimAdminException( |
| 367 |
|
"Invalid configuration param '{}' at '[database]':'driver'".format( |
| 368 |
|
self.config["database"]["driver"] |
| 369 |
|
) |
| 370 |
|
) |
| 371 |
|
|
| 372 |
0 |
self.lock_renew.start(self.db, self.loop) |
| 373 |
|
|
| 374 |
0 |
if not self.msg: |
| 375 |
0 |
config_msg = self.config["message"].copy() |
| 376 |
0 |
config_msg["loop"] = self.loop |
| 377 |
|
|
| 378 |
0 |
if config_msg["driver"] == "local": |
| 379 |
0 |
self.msg = msglocal.MsgLocal() |
| 380 |
0 |
self.msg.connect(config_msg) |
| 381 |
0 |
elif config_msg["driver"] == "kafka": |
| 382 |
0 |
self.msg = msgkafka.MsgKafka() |
| 383 |
0 |
self.msg.connect(config_msg) |
| 384 |
|
else: |
| 385 |
0 |
raise VimAdminException( |
| 386 |
|
"Invalid configuration param '{}' at '[message]':'driver'".format( |
| 387 |
|
config_msg["driver"] |
| 388 |
|
) |
| 389 |
|
) |
| 390 |
0 |
except (DbException, MsgException) as e: |
| 391 |
0 |
raise VimAdminException(str(e), http_code=e.http_code) |
| 392 |
|
|
| 393 |
0 |
self.logger.info("Starting") |
| 394 |
0 |
while not self.to_terminate: |
| 395 |
0 |
try: |
| 396 |
0 |
self.loop.run_until_complete( |
| 397 |
|
asyncio.ensure_future(self.aiomain(), loop=self.loop) |
| 398 |
|
) |
| 399 |
|
# except asyncio.CancelledError: |
| 400 |
|
# break # if cancelled it should end, breaking loop |
| 401 |
0 |
except Exception as e: |
| 402 |
0 |
if not self.to_terminate: |
| 403 |
0 |
self.logger.exception( |
| 404 |
|
"Exception '{}' at messaging read loop".format(e), exc_info=True |
| 405 |
|
) |
| 406 |
|
|
| 407 |
0 |
self.logger.info("Finishing") |
| 408 |
0 |
self._stop() |
| 409 |
0 |
self.loop.close() |
| 410 |
|
|
| 411 |
1 |
async def _msg_callback(self, topic, command, params): |
| 412 |
|
""" |
| 413 |
|
Callback to process a received message from kafka |
| 414 |
|
:param topic: topic received |
| 415 |
|
:param command: command received |
| 416 |
|
:param params: rest of parameters |
| 417 |
|
:return: None |
| 418 |
|
""" |
| 419 |
0 |
try: |
| 420 |
0 |
if command == "echo": |
| 421 |
0 |
return |
| 422 |
|
|
| 423 |
0 |
if topic in self.kafka_topics: |
| 424 |
0 |
target = topic[0:3] # vim, wim or sdn |
| 425 |
0 |
target_id = target + ":" + params["_id"] |
| 426 |
|
|
| 427 |
0 |
if command in ("edited", "edit"): |
| 428 |
0 |
self.engine.reload_vim(target_id) |
| 429 |
0 |
self.logger.debug("ordered to reload {}".format(target_id)) |
| 430 |
0 |
elif command in ("deleted", "delete"): |
| 431 |
0 |
self.engine.unload_vim(target_id) |
| 432 |
0 |
self.logger.debug("ordered to unload {}".format(target_id)) |
| 433 |
0 |
elif command in ("create", "created"): |
| 434 |
0 |
self.engine.check_vim(target_id) |
| 435 |
0 |
self.logger.debug("ordered to check {}".format(target_id)) |
| 436 |
0 |
except (DbException, MsgException) as e: |
| 437 |
0 |
self.logger.error( |
| 438 |
|
"Error while processing topic={} command={}: {}".format( |
| 439 |
|
topic, command, e |
| 440 |
|
) |
| 441 |
|
) |
| 442 |
0 |
except Exception as e: |
| 443 |
0 |
self.logger.exception( |
| 444 |
|
"Exception while processing topic={} command={}: {}".format( |
| 445 |
|
topic, command, e |
| 446 |
|
), |
| 447 |
|
exc_info=True, |
| 448 |
|
) |
| 449 |
|
|
| 450 |
1 |
def _stop(self): |
| 451 |
|
""" |
| 452 |
|
Close all connections |
| 453 |
|
:return: None |
| 454 |
|
""" |
| 455 |
0 |
try: |
| 456 |
0 |
if self.db: |
| 457 |
0 |
self.db.db_disconnect() |
| 458 |
|
|
| 459 |
0 |
if self.msg: |
| 460 |
0 |
self.msg.disconnect() |
| 461 |
0 |
except (DbException, MsgException) as e: |
| 462 |
0 |
raise VimAdminException(str(e), http_code=e.http_code) |
| 463 |
|
|
| 464 |
1 |
def terminate(self): |
| 465 |
|
""" |
| 466 |
|
This is a threading safe method to terminate this thread. Termination is done asynchronous afterwards, |
| 467 |
|
but not immediately. |
| 468 |
|
:return: None |
| 469 |
|
""" |
| 470 |
0 |
self.to_terminate = True |
| 471 |
0 |
self.lock_renew.to_terminate = True |
| 472 |
|
|
| 473 |
0 |
if self.aiomain_task_kafka: |
| 474 |
0 |
self.loop.call_soon_threadsafe(self.aiomain_task_kafka.cancel) |
| 475 |
|
|
| 476 |
0 |
if self.aiomain_task_vim: |
| 477 |
0 |
self.loop.call_soon_threadsafe(self.aiomain_task_vim.cancel) |
| 478 |
|
|
| 479 |
0 |
if self.aiomain_task_renew_lock: |
| 480 |
0 |
self.loop.call_soon_threadsafe(self.aiomain_task_renew_lock.cancel) |
| 481 |
|
|
| 482 |
0 |
self.lock_renew.stop() |
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