osm_lcm/lcm_utils.py

   1 # -*- coding: utf-8 -*-
   2
   3 ##
   4 # Copyright 2018 Telefonica S.A.
   5 #
   6 # Licensed under the Apache License, Version 2.0 (the "License"); you may
   7 # not use this file except in compliance with the License. You may obtain
   8 # a copy of the License at
   9 #
  10 #         http://www.apache.org/licenses/LICENSE-2.0
  11 #
  12 # Unless required by applicable law or agreed to in writing, software
  13 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  14 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  15 # License for the specific language governing permissions and limitations
  16 # under the License.
  17 ##
  18
  19 from collections import OrderedDict
  20 from osm_common.dbbase import DbException
  21
  22 __author__ = "Alfonso Tierno"
  23
  24
  25 class LcmException(Exception):
  26     pass
  27
  28
  29 class LcmExceptionNoMgmtIP(LcmException):
  30     pass
  31
  32
  33 class LcmExceptionExit(LcmException):
  34     pass
  35
  36
  37 def versiontuple(v):
  38     """utility for compare dot separate versions. Fills with zeros to proper number comparison
  39     package version will be something like 4.0.1.post11+gb3f024d.dirty-1. Where 4.0.1 is the git tag, postXX is the
  40     number of commits from this tag, and +XXXXXXX is the git commit short id. Total length is 16 with until 999 commits
  41     """
  42     filled = []
  43     for point in v.split("."):
  44         filled.append(point.zfill(16))
  45     return tuple(filled)
  46
  47
  48 class TaskRegistry:
  49     """
  50     Implements a registry of task needed for later cancelation, look for related tasks that must be completed before
  51     etc. It stores a four level dict
  52     First level is the topic, ns, vim_account, sdn
  53     Second level is the _id
  54     Third level is the operation id
  55     Fourth level is a descriptive name, the value is the task class
  56     """
  57
  58     def __init__(self):
  59         self.task_registry = {
  60             "ns": {},
  61             "nsi": {},
  62             "vim_account": {},
  63             "wim_account": {},
  64             "sdn": {},
  65         }
  66
  67     def register(self, topic, _id, op_id, task_name, task):
  68         """
  69         Register a new task
  70         :param topic: Can be "ns", "nsi", "vim_account", "sdn"
  71         :param _id: _id of the related item
  72         :param op_id: id of the operation of the related item
  73         :param task_name: Task descriptive name, as create, instantiate, terminate. Must be unique in this op_id
  74         :param task: Task class
  75         :return: none
  76         """
  77         if _id not in self.task_registry[topic]:
  78             self.task_registry[topic][_id] = OrderedDict()
  79         if op_id not in self.task_registry[topic][_id]:
  80             self.task_registry[topic][_id][op_id] = {task_name: task}
  81         else:
  82             self.task_registry[topic][_id][op_id][task_name] = task
  83         # print("registering task", topic, _id, op_id, task_name, task)
  84
  85     def remove(self, topic, _id, op_id, task_name=None):
  86         """
  87         When task is ended, it should removed. It ignores missing tasks
  88         :param topic: Can be "ns", "nsi", "vim_account", "sdn"
  89         :param _id: _id of the related item
  90         :param op_id: id of the operation of the related item
  91         :param task_name: Task descriptive name. If note it deletes all
  92         :return:
  93         """
  94         if not self.task_registry[topic].get(_id) or not self.task_registry[topic][_id].get(op_id):
  95             return
  96         if not task_name:
  97             # print("deleting tasks", topic, _id, op_id, self.task_registry[topic][_id][op_id])
  98             del self.task_registry[topic][_id][op_id]
  99         elif task_name in self.task_registry[topic][_id][op_id]:
 100             # print("deleting tasks", topic, _id, op_id, task_name, self.task_registry[topic][_id][op_id][task_name])
 101             del self.task_registry[topic][_id][op_id][task_name]
 102             if not self.task_registry[topic][_id][op_id]:
 103                 del self.task_registry[topic][_id][op_id]
 104         if not self.task_registry[topic][_id]:
 105             del self.task_registry[topic][_id]
 106
 107     def lookfor_related(self, topic, _id, my_op_id=None):
 108         task_list = []
 109         task_name_list = []
 110         if _id not in self.task_registry[topic]:
 111             return "", task_name_list
 112         for op_id in reversed(self.task_registry[topic][_id]):
 113             if my_op_id:
 114                 if my_op_id == op_id:
 115                     my_op_id = None  # so that the next task is taken
 116                 continue
 117
 118             for task_name, task in self.task_registry[topic][_id][op_id].items():
 119                 task_list.append(task)
 120                 task_name_list.append(task_name)
 121             break
 122         return ", ".join(task_name_list), task_list
 123
 124     def cancel(self, topic, _id, target_op_id=None, target_task_name=None):
 125         """
 126         Cancel all active tasks of a concrete ns, nsi, vim_account, sdn identified for _id. If op_id is supplied only
 127         this is cancelled, and the same with task_name
 128         """
 129         if not self.task_registry[topic].get(_id):
 130             return
 131         for op_id in reversed(self.task_registry[topic][_id]):
 132             if target_op_id and target_op_id != op_id:
 133                 continue
 134             for task_name, task in self.task_registry[topic][_id][op_id].items():
 135                 if target_task_name and target_task_name != task_name:
 136                     continue
 137                 # result =
 138                 task.cancel()
 139                 # if result:
 140                 #     self.logger.debug("{} _id={} order_id={} task={} cancelled".format(topic, _id, op_id, task_name))
 141
 142
 143 class LcmBase:
 144
 145     def __init__(self, db, msg, fs, logger):
 146         """
 147
 148         :param db: database connection
 149         """
 150         self.db = db
 151         self.msg = msg
 152         self.fs = fs
 153         self.logger = logger
 154
 155     def update_db_2(self, item, _id, _desc):
 156         """
 157         Updates database with _desc information. Upon success _desc is cleared
 158         :param item:
 159         :param _id:
 160         :param _desc:
 161         :return:
 162         """
 163         if not _desc:
 164             return
 165         try:
 166             self.db.set_one(item, {"_id": _id}, _desc)
 167             _desc.clear()
 168         except DbException as e:
 169             self.logger.error("Updating {} _id={} with '{}'. Error: {}".format(item, _id, _desc, e))