[osm/RO.git] / NG-RO / osm_ng_ro / ns.py

# -*- coding: utf-8 -*-

##
# Copyright 2020 Telefonica Investigacion y Desarrollo, S.A.U.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##

from copy import deepcopy
from http import HTTPStatus
from itertools import product
import logging
from random import choice as random_choice
from threading import Lock
from time import time
from traceback import format_exc as traceback_format_exc
from typing import Any, Dict, List, Optional, Tuple, Type
from uuid import uuid4

from cryptography.hazmat.backends import default_backend as crypto_default_backend
from cryptography.hazmat.primitives import serialization as crypto_serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from jinja2 import (
    Environment,
    select_autoescape,
    StrictUndefined,
    TemplateError,
    TemplateNotFound,
    UndefinedError,
)
from osm_common import (
    dbmemory,
    dbmongo,
    fslocal,
    fsmongo,
    msgkafka,
    msglocal,
    version as common_version,
)
from osm_common.dbbase import DbBase, DbException
from osm_common.fsbase import FsBase, FsException
from osm_common.msgbase import MsgException
from osm_ng_ro.ns_thread import deep_get, NsWorker, NsWorkerException
from osm_ng_ro.validation import deploy_schema, validate_input
import yaml

__author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
min_common_version = "0.1.16"


class NsException(Exception):
    def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST):
        self.http_code = http_code
        super(Exception, self).__init__(message)


def get_process_id():
    """
    Obtain a unique ID for this process. If running from inside docker, it will get docker ID. If not it
    will provide a random one
    :return: Obtained ID
    """
    # Try getting docker id. If fails, get pid
    try:
        with open("/proc/self/cgroup", "r") as f:
            text_id_ = f.readline()
            _, _, text_id = text_id_.rpartition("/")
            text_id = text_id.replace("\n", "")[:12]

            if text_id:
                return text_id
    except Exception as error:
        logging.exception(f"{error} occured while getting process id")

    # Return a random id
    return "".join(random_choice("0123456789abcdef") for _ in range(12))


def versiontuple(v):
    """utility for compare dot separate versions. Fills with zeros to proper number comparison"""
    filled = []

    for point in v.split("."):
        filled.append(point.zfill(8))

    return tuple(filled)


class Ns(object):
    def __init__(self):
        self.db = None
        self.fs = None
        self.msg = None
        self.config = None
        # self.operations = None
        self.logger = None
        # ^ Getting logger inside method self.start because parent logger (ro) is not available yet.
        # If done now it will not be linked to parent not getting its handler and level
        self.map_topic = {}
        self.write_lock = None
        self.vims_assigned = {}
        self.next_worker = 0
        self.plugins = {}
        self.workers = []
        self.process_params_function_map = {
            "net": Ns._process_net_params,
            "image": Ns._process_image_params,
            "flavor": Ns._process_flavor_params,
            "vdu": Ns._process_vdu_params,
            "classification": Ns._process_classification_params,
            "sfi": Ns._process_sfi_params,
            "sf": Ns._process_sf_params,
            "sfp": Ns._process_sfp_params,
            "affinity-or-anti-affinity-group": Ns._process_affinity_group_params,
            "shared-volumes": Ns._process_shared_volumes_params,
        }
        self.db_path_map = {
            "net": "vld",
            "image": "image",
            "flavor": "flavor",
            "vdu": "vdur",
            "classification": "classification",
            "sfi": "sfi",
            "sf": "sf",
            "sfp": "sfp",
            "affinity-or-anti-affinity-group": "affinity-or-anti-affinity-group",
            "shared-volumes": "shared-volumes",
        }

    def init_db(self, target_version):
        pass

    def start(self, config):
        """
        Connect to database, filesystem storage, and messaging
        :param config: two level dictionary with configuration. Top level should contain 'database', 'storage',
        :param config: Configuration of db, storage, etc
        :return: None
        """
        self.config = config
        self.config["process_id"] = get_process_id()  # used for HA identity
        self.logger = logging.getLogger("ro.ns")

        # check right version of common
        if versiontuple(common_version) < versiontuple(min_common_version):
            raise NsException(
                "Not compatible osm/common version '{}'. Needed '{}' or higher".format(
                    common_version, min_common_version
                )
            )

        try:
            if not self.db:
                if config["database"]["driver"] == "mongo":
                    self.db = dbmongo.DbMongo()
                    self.db.db_connect(config["database"])
                elif config["database"]["driver"] == "memory":
                    self.db = dbmemory.DbMemory()
                    self.db.db_connect(config["database"])
                else:
                    raise NsException(
                        "Invalid configuration param '{}' at '[database]':'driver'".format(
                            config["database"]["driver"]
                        )
                    )

            if not self.fs:
                if config["storage"]["driver"] == "local":
                    self.fs = fslocal.FsLocal()
                    self.fs.fs_connect(config["storage"])
                elif config["storage"]["driver"] == "mongo":
                    self.fs = fsmongo.FsMongo()
                    self.fs.fs_connect(config["storage"])
                elif config["storage"]["driver"] is None:
                    pass
                else:
                    raise NsException(
                        "Invalid configuration param '{}' at '[storage]':'driver'".format(
                            config["storage"]["driver"]
                        )
                    )

            if not self.msg:
                if config["message"]["driver"] == "local":
                    self.msg = msglocal.MsgLocal()
                    self.msg.connect(config["message"])
                elif config["message"]["driver"] == "kafka":
                    self.msg = msgkafka.MsgKafka()
                    self.msg.connect(config["message"])
                else:
                    raise NsException(
                        "Invalid configuration param '{}' at '[message]':'driver'".format(
                            config["message"]["driver"]
                        )
                    )

            # TODO load workers to deal with exising database tasks

            self.write_lock = Lock()
        except (DbException, FsException, MsgException) as e:
            raise NsException(str(e), http_code=e.http_code)

    def get_assigned_vims(self):
        return list(self.vims_assigned.keys())

    def stop(self):
        try:
            if self.db:
                self.db.db_disconnect()

            if self.fs:
                self.fs.fs_disconnect()

            if self.msg:
                self.msg.disconnect()

            self.write_lock = None
        except (DbException, FsException, MsgException) as e:
            raise NsException(str(e), http_code=e.http_code)

        for worker in self.workers:
            worker.insert_task(("terminate",))

    def _create_worker(self):
        """
        Look for a worker thread in idle status. If not found it creates one unless the number of threads reach the
        limit of 'server.ns_threads' configuration. If reached, it just assigns one existing thread
        return the index of the assigned worker thread. Worker threads are storead at self.workers
        """
        # Look for a thread in idle status
        worker_id = next(
            (
                i
                for i in range(len(self.workers))
                if self.workers[i] and self.workers[i].idle
            ),
            None,
        )

        if worker_id is not None:
            # unset idle status to avoid race conditions
            self.workers[worker_id].idle = False
        else:
            worker_id = len(self.workers)

            if worker_id < self.config["global"]["server.ns_threads"]:
                # create a new worker
                self.workers.append(
                    NsWorker(worker_id, self.config, self.plugins, self.db)
                )
                self.workers[worker_id].start()
            else:
                # reached maximum number of threads, assign VIM to an existing one
                worker_id = self.next_worker
                self.next_worker = (self.next_worker + 1) % self.config["global"][
                    "server.ns_threads"
                ]

        return worker_id

    def assign_vim(self, target_id):
        with self.write_lock:
            return self._assign_vim(target_id)

    def _assign_vim(self, target_id):
        if target_id not in self.vims_assigned:
            worker_id = self.vims_assigned[target_id] = self._create_worker()
            self.workers[worker_id].insert_task(("load_vim", target_id))

    def reload_vim(self, target_id):
        # send reload_vim to the thread working with this VIM and inform all that a VIM has been changed,
        # this is because database VIM information is cached for threads working with SDN
        with self.write_lock:
            for worker in self.workers:
                if worker and not worker.idle:
                    worker.insert_task(("reload_vim", target_id))

    def unload_vim(self, target_id):
        with self.write_lock:
            return self._unload_vim(target_id)

    def _unload_vim(self, target_id):
        if target_id in self.vims_assigned:
            worker_id = self.vims_assigned[target_id]
            self.workers[worker_id].insert_task(("unload_vim", target_id))
            del self.vims_assigned[target_id]

    def check_vim(self, target_id):
        with self.write_lock:
            if target_id in self.vims_assigned:
                worker_id = self.vims_assigned[target_id]
            else:
                worker_id = self._create_worker()

        worker = self.workers[worker_id]
        worker.insert_task(("check_vim", target_id))

    def unload_unused_vims(self):
        with self.write_lock:
            vims_to_unload = []

            for target_id in self.vims_assigned:
                if not self.db.get_one(
                    "ro_tasks",
                    q_filter={
                        "target_id": target_id,
                        "tasks.status": ["SCHEDULED", "BUILD", "DONE", "FAILED"],
                    },
                    fail_on_empty=False,
                ):
                    vims_to_unload.append(target_id)

            for target_id in vims_to_unload:
                self._unload_vim(target_id)

    @staticmethod
    def _get_cloud_init(
        db: Type[DbBase],
        fs: Type[FsBase],
        location: str,
    ) -> str:
        """This method reads cloud init from a file.

        Note: Not used as cloud init content is provided in the http body.

        Args:
            db (Type[DbBase]): [description]
            fs (Type[FsBase]): [description]
            location (str): can be 'vnfr_id:file:file_name' or 'vnfr_id:vdu:vdu_idex'

        Raises:
            NsException: [description]
            NsException: [description]

        Returns:
            str: [description]
        """
        vnfd_id, _, other = location.partition(":")
        _type, _, name = other.partition(":")
        vnfd = db.get_one("vnfds", {"_id": vnfd_id})

        if _type == "file":
            base_folder = vnfd["_admin"]["storage"]
            cloud_init_file = "{}/{}/cloud_init/{}".format(
                base_folder["folder"], base_folder["pkg-dir"], name
            )

            if not fs:
                raise NsException(
                    "Cannot read file '{}'. Filesystem not loaded, change configuration at storage.driver".format(
                        cloud_init_file
                    )
                )

            with fs.file_open(cloud_init_file, "r") as ci_file:
                cloud_init_content = ci_file.read()
        elif _type == "vdu":
            cloud_init_content = vnfd["vdu"][int(name)]["cloud-init"]
        else:
            raise NsException("Mismatch descriptor for cloud init: {}".format(location))

        return cloud_init_content

    @staticmethod
    def _parse_jinja2(
        cloud_init_content: str,
        params: Dict[str, Any],
        context: str,
    ) -> str:
        """Function that processes the cloud init to replace Jinja2 encoded parameters.

        Args:
            cloud_init_content (str): [description]
            params (Dict[str, Any]): [description]
            context (str): [description]

        Raises:
            NsException: [description]
            NsException: [description]

        Returns:
            str: [description]
        """
        try:
            env = Environment(
                undefined=StrictUndefined,
                autoescape=select_autoescape(default_for_string=True, default=True),
            )
            template = env.from_string(cloud_init_content)

            return template.render(params or {})
        except UndefinedError as e:
            raise NsException(
                "Variable '{}' defined at vnfd='{}' must be provided in the instantiation parameters"
                "inside the 'additionalParamsForVnf' block".format(e, context)
            )
        except (TemplateError, TemplateNotFound) as e:
            raise NsException(
                "Error parsing Jinja2 to cloud-init content at vnfd='{}': {}".format(
                    context, e
                )
            )

    def _create_db_ro_nsrs(self, nsr_id, now):
        try:
            key = rsa.generate_private_key(
                backend=crypto_default_backend(), public_exponent=65537, key_size=2048
            )
            private_key = key.private_bytes(
                crypto_serialization.Encoding.PEM,
                crypto_serialization.PrivateFormat.PKCS8,
                crypto_serialization.NoEncryption(),
            )
            public_key = key.public_key().public_bytes(
                crypto_serialization.Encoding.OpenSSH,
                crypto_serialization.PublicFormat.OpenSSH,
            )
            private_key = private_key.decode("utf8")
            # Change first line because Paramiko needs a explicit start with 'BEGIN RSA PRIVATE KEY'
            i = private_key.find("\n")
            private_key = "-----BEGIN RSA PRIVATE KEY-----" + private_key[i:]
            public_key = public_key.decode("utf8")
        except Exception as e:
            raise NsException("Cannot create ssh-keys: {}".format(e))

        schema_version = "1.1"
        private_key_encrypted = self.db.encrypt(
            private_key, schema_version=schema_version, salt=nsr_id
        )
        db_content = {
            "_id": nsr_id,
            "_admin": {
                "created": now,
                "modified": now,
                "schema_version": schema_version,
            },
            "public_key": public_key,
            "private_key": private_key_encrypted,
            "actions": [],
        }
        self.db.create("ro_nsrs", db_content)

        return db_content

    @staticmethod
    def _create_task(
        deployment_info: Dict[str, Any],
        target_id: str,
        item: str,
        action: str,
        target_record: str,
        target_record_id: str,
        extra_dict: Dict[str, Any] = None,
    ) -> Dict[str, Any]:
        """Function to create task dict from deployment information.

        Args:
            deployment_info (Dict[str, Any]): [description]
            target_id (str): [description]
            item (str): [description]
            action (str): [description]
            target_record (str): [description]
            target_record_id (str): [description]
            extra_dict (Dict[str, Any], optional): [description]. Defaults to None.

        Returns:
            Dict[str, Any]: [description]
        """
        task = {
            "target_id": target_id,  # it will be removed before pushing at database
            "action_id": deployment_info.get("action_id"),
            "nsr_id": deployment_info.get("nsr_id"),
            "task_id": f"{deployment_info.get('action_id')}:{deployment_info.get('task_index')}",
            "status": "SCHEDULED",
            "action": action,
            "item": item,
            "target_record": target_record,
            "target_record_id": target_record_id,
        }

        if extra_dict:
            task.update(extra_dict)  # params, find_params, depends_on

        deployment_info["task_index"] = deployment_info.get("task_index", 0) + 1

        return task

    @staticmethod
    def _create_ro_task(
        target_id: str,
        task: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Function to create an RO task from task information.

        Args:
            target_id (str): [description]
            task (Dict[str, Any]): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        now = time()

        _id = task.get("task_id")
        db_ro_task = {
            "_id": _id,
            "locked_by": None,
            "locked_at": 0.0,
            "target_id": target_id,
            "vim_info": {
                "created": False,
                "created_items": None,
                "vim_id": None,
                "vim_name": None,
                "vim_status": None,
                "vim_details": None,
                "vim_message": None,
                "refresh_at": None,
            },
            "modified_at": now,
            "created_at": now,
            "to_check_at": now,
            "tasks": [task],
        }

        return db_ro_task

    @staticmethod
    def _process_image_params(
        target_image: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Function to process VDU image parameters.

        Args:
            target_image (Dict[str, Any]): [description]
            indata (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        find_params = {}

        if target_image.get("image"):
            find_params["filter_dict"] = {"name": target_image.get("image")}

        if target_image.get("vim_image_id"):
            find_params["filter_dict"] = {"id": target_image.get("vim_image_id")}

        if target_image.get("image_checksum"):
            find_params["filter_dict"] = {
                "checksum": target_image.get("image_checksum")
            }

        return {"find_params": find_params}

    @staticmethod
    def _get_resource_allocation_params(
        quota_descriptor: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Read the quota_descriptor from vnfd and fetch the resource allocation properties from the
        descriptor object.

        Args:
            quota_descriptor (Dict[str, Any]): cpu/mem/vif/disk-io quota descriptor

        Returns:
            Dict[str, Any]: quota params for limit, reserve, shares from the descriptor object
        """
        quota = {}

        if quota_descriptor.get("limit"):
            quota["limit"] = int(quota_descriptor["limit"])

        if quota_descriptor.get("reserve"):
            quota["reserve"] = int(quota_descriptor["reserve"])

        if quota_descriptor.get("shares"):
            quota["shares"] = int(quota_descriptor["shares"])

        return quota

    @staticmethod
    def _process_guest_epa_quota_params(
        guest_epa_quota: Dict[str, Any],
        epa_vcpu_set: bool,
    ) -> Dict[str, Any]:
        """Function to extract the guest epa quota parameters.

        Args:
            guest_epa_quota (Dict[str, Any]): [description]
            epa_vcpu_set (bool): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        result = {}

        if guest_epa_quota.get("cpu-quota") and not epa_vcpu_set:
            cpuquota = Ns._get_resource_allocation_params(
                guest_epa_quota.get("cpu-quota")
            )

            if cpuquota:
                result["cpu-quota"] = cpuquota

        if guest_epa_quota.get("mem-quota"):
            vduquota = Ns._get_resource_allocation_params(
                guest_epa_quota.get("mem-quota")
            )

            if vduquota:
                result["mem-quota"] = vduquota

        if guest_epa_quota.get("disk-io-quota"):
            diskioquota = Ns._get_resource_allocation_params(
                guest_epa_quota.get("disk-io-quota")
            )

            if diskioquota:
                result["disk-io-quota"] = diskioquota

        if guest_epa_quota.get("vif-quota"):
            vifquota = Ns._get_resource_allocation_params(
                guest_epa_quota.get("vif-quota")
            )

            if vifquota:
                result["vif-quota"] = vifquota

        return result

    @staticmethod
    def _process_guest_epa_numa_params(
        guest_epa_quota: Dict[str, Any],
    ) -> Tuple[Dict[str, Any], bool]:
        """[summary]

        Args:
            guest_epa_quota (Dict[str, Any]): [description]

        Returns:
            Tuple[Dict[str, Any], bool]: [description]
        """
        numa = {}
        numa_list = []
        epa_vcpu_set = False

        if guest_epa_quota.get("numa-node-policy"):
            numa_node_policy = guest_epa_quota.get("numa-node-policy")

            if numa_node_policy.get("node"):
                for numa_node in numa_node_policy["node"]:
                    vcpu_list = []
                    if numa_node.get("id"):
                        numa["id"] = int(numa_node["id"])

                    if numa_node.get("vcpu"):
                        for vcpu in numa_node.get("vcpu"):
                            vcpu_id = int(vcpu.get("id"))
                            vcpu_list.append(vcpu_id)
                        numa["vcpu"] = vcpu_list

                    if numa_node.get("num-cores"):
                        numa["cores"] = numa_node["num-cores"]
                        epa_vcpu_set = True

                    paired_threads = numa_node.get("paired-threads", {})
                    if paired_threads.get("num-paired-threads"):
                        numa["paired_threads"] = int(
                            numa_node["paired-threads"]["num-paired-threads"]
                        )
                        epa_vcpu_set = True

                    if paired_threads.get("paired-thread-ids"):
                        numa["paired-threads-id"] = []

                        for pair in paired_threads["paired-thread-ids"]:
                            numa["paired-threads-id"].append(
                                (
                                    str(pair["thread-a"]),
                                    str(pair["thread-b"]),
                                )
                            )

                    if numa_node.get("num-threads"):
                        numa["threads"] = int(numa_node["num-threads"])
                        epa_vcpu_set = True

                    if numa_node.get("memory-mb"):
                        numa["memory"] = max(int(int(numa_node["memory-mb"]) / 1024), 1)

                    numa_list.append(numa)
                    numa = {}

        return numa_list, epa_vcpu_set

    @staticmethod
    def _process_guest_epa_cpu_pinning_params(
        guest_epa_quota: Dict[str, Any],
        vcpu_count: int,
        epa_vcpu_set: bool,
    ) -> Tuple[Dict[str, Any], bool]:
        """[summary]

        Args:
            guest_epa_quota (Dict[str, Any]): [description]
            vcpu_count (int): [description]
            epa_vcpu_set (bool): [description]

        Returns:
            Tuple[Dict[str, Any], bool]: [description]
        """
        numa = {}
        local_epa_vcpu_set = epa_vcpu_set

        if (
            guest_epa_quota.get("cpu-pinning-policy") == "DEDICATED"
            and not epa_vcpu_set
        ):
            # Pinning policy "REQUIRE" uses threads as host should support SMT architecture
            # Pinning policy "ISOLATE" uses cores as host should not support SMT architecture
            # Pinning policy "PREFER" uses threads in case host supports SMT architecture
            numa[
                "cores"
                if guest_epa_quota.get("cpu-thread-pinning-policy") == "ISOLATE"
                else "threads"
            ] = max(vcpu_count, 1)
            local_epa_vcpu_set = True

        return numa, local_epa_vcpu_set

    @staticmethod
    def _process_epa_params(
        target_flavor: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_flavor (Dict[str, Any]): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        extended = {}
        numa = {}
        numa_list = []

        if target_flavor.get("guest-epa"):
            guest_epa = target_flavor["guest-epa"]

            numa_list, epa_vcpu_set = Ns._process_guest_epa_numa_params(
                guest_epa_quota=guest_epa
            )

            if guest_epa.get("mempage-size"):
                extended["mempage-size"] = guest_epa.get("mempage-size")

            if guest_epa.get("cpu-pinning-policy"):
                extended["cpu-pinning-policy"] = guest_epa.get("cpu-pinning-policy")

            if guest_epa.get("cpu-thread-pinning-policy"):
                extended["cpu-thread-pinning-policy"] = guest_epa.get(
                    "cpu-thread-pinning-policy"
                )

            if guest_epa.get("numa-node-policy"):
                if guest_epa.get("numa-node-policy").get("mem-policy"):
                    extended["mem-policy"] = guest_epa.get("numa-node-policy").get(
                        "mem-policy"
                    )

            tmp_numa, epa_vcpu_set = Ns._process_guest_epa_cpu_pinning_params(
                guest_epa_quota=guest_epa,
                vcpu_count=int(target_flavor.get("vcpu-count", 1)),
                epa_vcpu_set=epa_vcpu_set,
            )
            for numa in numa_list:
                numa.update(tmp_numa)

            extended.update(
                Ns._process_guest_epa_quota_params(
                    guest_epa_quota=guest_epa,
                    epa_vcpu_set=epa_vcpu_set,
                )
            )

        if numa:
            extended["numas"] = numa_list

        return extended

    @staticmethod
    def _process_flavor_params(
        target_flavor: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_flavor (Dict[str, Any]): [description]
            indata (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        db = kwargs.get("db")
        target_vdur = {}

        for vnf in indata.get("vnf", []):
            for vdur in vnf.get("vdur", []):
                if vdur.get("ns-flavor-id") == target_flavor.get("id"):
                    target_vdur = vdur

        vim_flavor_id = (
            target_vdur.get("additionalParams", {}).get("OSM", {}).get("vim_flavor_id")
        )
        if vim_flavor_id:  # vim-flavor-id was passed so flavor won't be created
            return {"find_params": {"vim_flavor_id": vim_flavor_id}}

        flavor_data = {
            "disk": int(target_flavor["storage-gb"]),
            "ram": int(target_flavor["memory-mb"]),
            "vcpus": int(target_flavor["vcpu-count"]),
        }

        if db and isinstance(indata.get("vnf"), list):
            vnfd_id = indata.get("vnf")[0].get("vnfd-id")
            vnfd = db.get_one("vnfds", {"_id": vnfd_id})
            # check if there is persistent root disk
            for vdu in vnfd.get("vdu", ()):
                if vdu["name"] == target_vdur.get("vdu-name"):
                    for vsd in vnfd.get("virtual-storage-desc", ()):
                        if vsd.get("id") == vdu.get("virtual-storage-desc", [[]])[0]:
                            root_disk = vsd
                            if (
                                root_disk.get("type-of-storage")
                                == "persistent-storage:persistent-storage"
                            ):
                                flavor_data["disk"] = 0

        for storage in target_vdur.get("virtual-storages", []):
            if (
                storage.get("type-of-storage")
                == "etsi-nfv-descriptors:ephemeral-storage"
            ):
                flavor_data["ephemeral"] = int(storage.get("size-of-storage", 0))
            elif storage.get("type-of-storage") == "etsi-nfv-descriptors:swap-storage":
                flavor_data["swap"] = int(storage.get("size-of-storage", 0))

        extended = Ns._process_epa_params(target_flavor)
        if extended:
            flavor_data["extended"] = extended

        extra_dict = {"find_params": {"flavor_data": flavor_data}}
        flavor_data_name = flavor_data.copy()
        flavor_data_name["name"] = target_flavor["name"]
        extra_dict["params"] = {"flavor_data": flavor_data_name}
        return extra_dict

    @staticmethod
    def _prefix_ip_address(ip_address):
        if "/" not in ip_address:
            ip_address += "/32"
        return ip_address

    @staticmethod
    def _process_ip_proto(ip_proto):
        if ip_proto:
            if ip_proto == 1:
                ip_proto = "icmp"
            elif ip_proto == 6:
                ip_proto = "tcp"
            elif ip_proto == 17:
                ip_proto = "udp"
        return ip_proto

    @staticmethod
    def _process_classification_params(
        target_classification: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_classification (Dict[str, Any]): Classification dictionary parameters that needs to be processed to create resource on VIM
            indata (Dict[str, Any]): Deployment info
            vim_info (Dict[str, Any]):To add items created by OSM on the VIM.
            target_record_id (str): Task record ID.
            **kwargs (Dict[str, Any]): Used to send additional information to the task.

        Returns:
            Dict[str, Any]: Return parameters required to create classification and Items on which classification is dependent.
        """
        vnfr_id = target_classification["vnfr_id"]
        vdur_id = target_classification["vdur_id"]
        port_index = target_classification["ingress_port_index"]
        extra_dict = {}

        classification_data = {
            "name": target_classification["id"],
            "source_port_range_min": target_classification["source-port"],
            "source_port_range_max": target_classification["source-port"],
            "destination_port_range_min": target_classification["destination-port"],
            "destination_port_range_max": target_classification["destination-port"],
        }

        classification_data["source_ip_prefix"] = Ns._prefix_ip_address(
            target_classification["source-ip-address"]
        )

        classification_data["destination_ip_prefix"] = Ns._prefix_ip_address(
            target_classification["destination-ip-address"]
        )

        classification_data["protocol"] = Ns._process_ip_proto(
            int(target_classification["ip-proto"])
        )

        db = kwargs.get("db")
        vdu_text = Ns._get_vnfr_vdur_text(db, vnfr_id, vdur_id)

        extra_dict = {"depends_on": [vdu_text]}

        extra_dict = {"depends_on": [vdu_text]}
        classification_data["logical_source_port"] = "TASK-" + vdu_text
        classification_data["logical_source_port_index"] = port_index

        extra_dict["params"] = classification_data

        return extra_dict

    @staticmethod
    def _process_sfi_params(
        target_sfi: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_sfi (Dict[str, Any]): SFI dictionary parameters that needs to be processed to create resource on VIM
            indata (Dict[str, Any]): deployment info
            vim_info (Dict[str, Any]): To add items created by OSM on the VIM.
            target_record_id (str): Task record ID.
            **kwargs (Dict[str, Any]): Used to send additional information to the task.

        Returns:
            Dict[str, Any]: Return parameters required to create SFI and Items on which SFI is dependent.
        """

        vnfr_id = target_sfi["vnfr_id"]
        vdur_id = target_sfi["vdur_id"]

        sfi_data = {
            "name": target_sfi["id"],
            "ingress_port_index": target_sfi["ingress_port_index"],
            "egress_port_index": target_sfi["egress_port_index"],
        }

        db = kwargs.get("db")
        vdu_text = Ns._get_vnfr_vdur_text(db, vnfr_id, vdur_id)

        extra_dict = {"depends_on": [vdu_text]}
        sfi_data["ingress_port"] = "TASK-" + vdu_text
        sfi_data["egress_port"] = "TASK-" + vdu_text

        extra_dict["params"] = sfi_data

        return extra_dict

    @staticmethod
    def _get_vnfr_vdur_text(db, vnfr_id, vdur_id):
        vnf_preffix = "vnfrs:{}".format(vnfr_id)
        db_vnfr = db.get_one("vnfrs", {"_id": vnfr_id})
        vdur_list = []
        vdu_text = ""

        if db_vnfr:
            vdur_list = [
                vdur["id"] for vdur in db_vnfr["vdur"] if vdur["vdu-id-ref"] == vdur_id
            ]

        if vdur_list:
            vdu_text = vnf_preffix + ":vdur." + vdur_list[0]

        return vdu_text

    @staticmethod
    def _process_sf_params(
        target_sf: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_sf (Dict[str, Any]): SF dictionary parameters that needs to be processed to create resource on VIM
            indata (Dict[str, Any]): Deployment info.
            vim_info (Dict[str, Any]):To add items created by OSM on the VIM.
            target_record_id (str): Task record ID.
            **kwargs (Dict[str, Any]): Used to send additional information to the task.

        Returns:
            Dict[str, Any]: Return parameters required to create SF and Items on which SF is dependent.
        """

        nsr_id = kwargs.get("nsr_id", "")
        sfis = target_sf["sfis"]
        ns_preffix = "nsrs:{}".format(nsr_id)
        extra_dict = {"depends_on": [], "params": []}
        sf_data = {"name": target_sf["id"], "sfis": sfis}

        for count, sfi in enumerate(sfis):
            sfi_text = ns_preffix + ":sfi." + sfi
            sfis[count] = "TASK-" + sfi_text
            extra_dict["depends_on"].append(sfi_text)

        extra_dict["params"] = sf_data

        return extra_dict

    @staticmethod
    def _process_sfp_params(
        target_sfp: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """[summary]

        Args:
            target_sfp (Dict[str, Any]): SFP dictionary parameters that needs to be processed to create resource on VIM.
            indata (Dict[str, Any]): Deployment info
            vim_info (Dict[str, Any]):To add items created by OSM on the VIM.
            target_record_id (str): Task record ID.
            **kwargs (Dict[str, Any]): Used to send additional information to the task.

        Returns:
            Dict[str, Any]: Return parameters required to create SFP and Items on which SFP is dependent.
        """

        nsr_id = kwargs.get("nsr_id")
        sfs = target_sfp["sfs"]
        classifications = target_sfp["classifications"]
        ns_preffix = "nsrs:{}".format(nsr_id)
        extra_dict = {"depends_on": [], "params": []}
        sfp_data = {
            "name": target_sfp["id"],
            "sfs": sfs,
            "classifications": classifications,
        }

        for count, sf in enumerate(sfs):
            sf_text = ns_preffix + ":sf." + sf
            sfs[count] = "TASK-" + sf_text
            extra_dict["depends_on"].append(sf_text)

        for count, classi in enumerate(classifications):
            classi_text = ns_preffix + ":classification." + classi
            classifications[count] = "TASK-" + classi_text
            extra_dict["depends_on"].append(classi_text)

        extra_dict["params"] = sfp_data

        return extra_dict

    @staticmethod
    def _process_net_params(
        target_vld: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Function to process network parameters.

        Args:
            target_vld (Dict[str, Any]): [description]
            indata (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        extra_dict = {}

        if vim_info.get("sdn"):
            # vnf_preffix = "vnfrs:{}".format(vnfr_id)
            # ns_preffix = "nsrs:{}".format(nsr_id)
            # remove the ending ".sdn
            vld_target_record_id, _, _ = target_record_id.rpartition(".")
            extra_dict["params"] = {
                k: vim_info[k]
                for k in ("sdn-ports", "target_vim", "vlds", "type")
                if vim_info.get(k)
            }

            # TODO needed to add target_id in the dependency.
            if vim_info.get("target_vim"):
                extra_dict["depends_on"] = [
                    f"{vim_info.get('target_vim')} {vld_target_record_id}"
                ]

            return extra_dict

        if vim_info.get("vim_network_name"):
            extra_dict["find_params"] = {
                "filter_dict": {
                    "name": vim_info.get("vim_network_name"),
                },
            }
        elif vim_info.get("vim_network_id"):
            extra_dict["find_params"] = {
                "filter_dict": {
                    "id": vim_info.get("vim_network_id"),
                },
            }
        elif target_vld.get("mgmt-network") and not vim_info.get("provider_network"):
            extra_dict["find_params"] = {
                "mgmt": True,
                "name": target_vld["id"],
            }
        else:
            # create
            extra_dict["params"] = {
                "net_name": (
                    f"{indata.get('name')[:16]}-{target_vld.get('name', target_vld.get('id'))[:16]}"
                ),
                "ip_profile": vim_info.get("ip_profile"),
                "provider_network_profile": vim_info.get("provider_network"),
            }

            if not target_vld.get("underlay"):
                extra_dict["params"]["net_type"] = "bridge"
            else:
                extra_dict["params"]["net_type"] = (
                    "ptp" if target_vld.get("type") == "ELINE" else "data"
                )

        return extra_dict

    @staticmethod
    def find_persistent_root_volumes(
        vnfd: dict,
        target_vdu: dict,
        vdu_instantiation_volumes_list: list,
        disk_list: list,
    ) -> Dict[str, any]:
        """Find the persistent root volumes and add them to the disk_list
        by parsing the instantiation parameters.

        Args:
            vnfd    (dict):                                 VNF descriptor
            target_vdu      (dict):                         processed VDU
            vdu_instantiation_volumes_list  (list):         instantiation parameters for the each VDU as a list
            disk_list   (list):                             to be filled up

        Returns:
            persistent_root_disk    (dict):                 Details of persistent root disk

        """
        persistent_root_disk = {}
        # There can be only one root disk, when we find it, it will return the result

        for vdu, vsd in product(
            vnfd.get("vdu", ()), vnfd.get("virtual-storage-desc", ())
        ):
            if (
                vdu["name"] == target_vdu["vdu-name"]
                and vsd.get("id") == vdu.get("virtual-storage-desc", [[]])[0]
            ):
                root_disk = vsd
                if (
                    root_disk.get("type-of-storage")
                    == "persistent-storage:persistent-storage"
                ):
                    for vdu_volume in vdu_instantiation_volumes_list:
                        if (
                            vdu_volume["vim-volume-id"]
                            and root_disk["id"] == vdu_volume["name"]
                        ):
                            persistent_root_disk[vsd["id"]] = {
                                "vim_volume_id": vdu_volume["vim-volume-id"],
                                "image_id": vdu.get("sw-image-desc"),
                            }

                            disk_list.append(persistent_root_disk[vsd["id"]])

                            return persistent_root_disk

                    else:
                        if root_disk.get("size-of-storage"):
                            persistent_root_disk[vsd["id"]] = {
                                "image_id": vdu.get("sw-image-desc"),
                                "size": root_disk.get("size-of-storage"),
                                "keep": Ns.is_volume_keeping_required(root_disk),
                            }

                            disk_list.append(persistent_root_disk[vsd["id"]])

                            return persistent_root_disk
                return persistent_root_disk

    @staticmethod
    def find_persistent_volumes(
        persistent_root_disk: dict,
        target_vdu: dict,
        vdu_instantiation_volumes_list: list,
        disk_list: list,
    ) -> None:
        """Find the ordinary persistent volumes and add them to the disk_list
        by parsing the instantiation parameters.

        Args:
            persistent_root_disk:   persistent root disk dictionary
            target_vdu: processed VDU
            vdu_instantiation_volumes_list: instantiation parameters for the each VDU as a list
            disk_list:  to be filled up

        """
        # Find the ordinary volumes which are not added to the persistent_root_disk
        persistent_disk = {}
        for disk in target_vdu.get("virtual-storages", {}):
            if (
                disk.get("type-of-storage") == "persistent-storage:persistent-storage"
                and disk["id"] not in persistent_root_disk.keys()
            ):
                for vdu_volume in vdu_instantiation_volumes_list:
                    if vdu_volume["vim-volume-id"] and disk["id"] == vdu_volume["name"]:
                        persistent_disk[disk["id"]] = {
                            "vim_volume_id": vdu_volume["vim-volume-id"],
                        }
                        disk_list.append(persistent_disk[disk["id"]])

                else:
                    if disk["id"] not in persistent_disk.keys():
                        persistent_disk[disk["id"]] = {
                            "size": disk.get("size-of-storage"),
                            "keep": Ns.is_volume_keeping_required(disk),
                        }
                        disk_list.append(persistent_disk[disk["id"]])

    @staticmethod
    def is_volume_keeping_required(virtual_storage_desc: Dict[str, Any]) -> bool:
        """Function to decide keeping persistent volume
        upon VDU deletion.

        Args:
            virtual_storage_desc (Dict[str, Any]): virtual storage description dictionary

        Returns:
            bool (True/False)
        """

        if not virtual_storage_desc.get("vdu-storage-requirements"):
            return False
        for item in virtual_storage_desc.get("vdu-storage-requirements", {}):
            if item.get("key") == "keep-volume" and item.get("value").lower() == "true":
                return True
        return False

    @staticmethod
    def is_shared_volume(
        virtual_storage_desc: Dict[str, Any], vnfd_id: str
    ) -> (str, bool):
        """Function to decide if the volume type is multi attached or not .

        Args:
            virtual_storage_desc (Dict[str, Any]): virtual storage description dictionary
            vnfd_id (str): vnfd id

        Returns:
            bool (True/False)
            name (str) New name if it is a multiattach disk
        """

        if vdu_storage_requirements := virtual_storage_desc.get(
            "vdu-storage-requirements", {}
        ):
            for item in vdu_storage_requirements:
                if (
                    item.get("key") == "multiattach"
                    and item.get("value").lower() == "true"
                ):
                    name = f"shared-{virtual_storage_desc['id']}-{vnfd_id}"
                    return name, True
        return virtual_storage_desc["id"], False

    @staticmethod
    def _sort_vdu_interfaces(target_vdu: dict) -> None:
        """Sort the interfaces according to position number.

        Args:
            target_vdu  (dict):     Details of VDU to be created

        """
        # If the position info is provided for all the interfaces, it will be sorted
        # according to position number ascendingly.
        sorted_interfaces = sorted(
            target_vdu["interfaces"],
            key=lambda x: (x.get("position") is None, x.get("position")),
        )
        target_vdu["interfaces"] = sorted_interfaces

    @staticmethod
    def _partially_locate_vdu_interfaces(target_vdu: dict) -> None:
        """Only place the interfaces which has specific position.

        Args:
            target_vdu  (dict):     Details of VDU to be created

        """
        # If the position info is provided for some interfaces but not all of them, the interfaces
        # which has specific position numbers will be placed and others' positions will not be taken care.
        if any(
            i.get("position") + 1
            for i in target_vdu["interfaces"]
            if i.get("position") is not None
        ):
            n = len(target_vdu["interfaces"])
            sorted_interfaces = [-1] * n
            k, m = 0, 0

            while k < n:
                if target_vdu["interfaces"][k].get("position") is not None:
                    if any(i.get("position") == 0 for i in target_vdu["interfaces"]):
                        idx = target_vdu["interfaces"][k]["position"] + 1
                    else:
                        idx = target_vdu["interfaces"][k]["position"]
                    sorted_interfaces[idx - 1] = target_vdu["interfaces"][k]
                k += 1

            while m < n:
                if target_vdu["interfaces"][m].get("position") is None:
                    idy = sorted_interfaces.index(-1)
                    sorted_interfaces[idy] = target_vdu["interfaces"][m]
                m += 1

            target_vdu["interfaces"] = sorted_interfaces

    @staticmethod
    def _prepare_vdu_cloud_init(
        target_vdu: dict, vdu2cloud_init: dict, db: object, fs: object
    ) -> Dict:
        """Fill cloud_config dict with cloud init details.

        Args:
            target_vdu  (dict):         Details of VDU to be created
            vdu2cloud_init  (dict):     Cloud init dict
            db  (object):               DB object
            fs  (object):               FS object

        Returns:
            cloud_config (dict):        Cloud config details of VDU

        """
        # cloud config
        cloud_config = {}

        if target_vdu.get("cloud-init"):
            if target_vdu["cloud-init"] not in vdu2cloud_init:
                vdu2cloud_init[target_vdu["cloud-init"]] = Ns._get_cloud_init(
                    db=db,
                    fs=fs,
                    location=target_vdu["cloud-init"],
                )

            cloud_content_ = vdu2cloud_init[target_vdu["cloud-init"]]
            cloud_config["user-data"] = Ns._parse_jinja2(
                cloud_init_content=cloud_content_,
                params=target_vdu.get("additionalParams"),
                context=target_vdu["cloud-init"],
            )

        if target_vdu.get("boot-data-drive"):
            cloud_config["boot-data-drive"] = target_vdu.get("boot-data-drive")

        return cloud_config

    @staticmethod
    def _check_vld_information_of_interfaces(
        interface: dict, ns_preffix: str, vnf_preffix: str
    ) -> Optional[str]:
        """Prepare the net_text by the virtual link information for vnf and ns level.
        Args:
            interface   (dict):         Interface details
            ns_preffix  (str):          Prefix of NS
            vnf_preffix (str):          Prefix of VNF

        Returns:
            net_text    (str):          information of net

        """
        net_text = ""
        if interface.get("ns-vld-id"):
            net_text = ns_preffix + ":vld." + interface["ns-vld-id"]
        elif interface.get("vnf-vld-id"):
            net_text = vnf_preffix + ":vld." + interface["vnf-vld-id"]

        return net_text

    @staticmethod
    def _prepare_interface_port_security(interface: dict) -> None:
        """

        Args:
            interface   (dict):     Interface details

        """
        if "port-security-enabled" in interface:
            interface["port_security"] = interface.pop("port-security-enabled")

        if "port-security-disable-strategy" in interface:
            interface["port_security_disable_strategy"] = interface.pop(
                "port-security-disable-strategy"
            )

    @staticmethod
    def _create_net_item_of_interface(interface: dict, net_text: str) -> dict:
        """Prepare net item including name, port security, floating ip etc.

        Args:
            interface   (dict):         Interface details
            net_text    (str):          information of net

        Returns:
            net_item    (dict):         Dict including net details

        """

        net_item = {
            x: v
            for x, v in interface.items()
            if x
            in (
                "name",
                "vpci",
                "port_security",
                "port_security_disable_strategy",
                "floating_ip",
            )
        }
        net_item["net_id"] = "TASK-" + net_text
        net_item["type"] = "virtual"

        return net_item

    @staticmethod
    def _prepare_type_of_interface(
        interface: dict, tasks_by_target_record_id: dict, net_text: str, net_item: dict
    ) -> None:
        """Fill the net item type by interface type such as SR-IOV, OM-MGMT, bridge etc.

        Args:
            interface   (dict):                     Interface details
            tasks_by_target_record_id   (dict):     Task details
            net_text    (str):                      information of net
            net_item    (dict):                     Dict including net details

        """
        # TODO mac_address: used for  SR-IOV ifaces #TODO for other types
        # TODO floating_ip: True/False (or it can be None)

        if interface.get("type") in ("SR-IOV", "PCI-PASSTHROUGH"):
            # Mark the net create task as type data
            if deep_get(
                tasks_by_target_record_id,
                net_text,
                "extra_dict",
                "params",
                "net_type",
            ):
                tasks_by_target_record_id[net_text]["extra_dict"]["params"][
                    "net_type"
                ] = "data"

            net_item["use"] = "data"
            net_item["model"] = interface["type"]
            net_item["type"] = interface["type"]

        elif (
            interface.get("type") == "OM-MGMT"
            or interface.get("mgmt-interface")
            or interface.get("mgmt-vnf")
        ):
            net_item["use"] = "mgmt"

        else:
            # If interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
            net_item["use"] = "bridge"
            net_item["model"] = interface.get("type")

    @staticmethod
    def _prepare_vdu_interfaces(
        target_vdu: dict,
        extra_dict: dict,
        ns_preffix: str,
        vnf_preffix: str,
        logger: object,
        tasks_by_target_record_id: dict,
        net_list: list,
    ) -> None:
        """Prepare the net_item and add net_list, add mgmt interface to extra_dict.

        Args:
            target_vdu  (dict):                             VDU to be created
            extra_dict  (dict):                             Dictionary to be filled
            ns_preffix  (str):                              NS prefix as string
            vnf_preffix (str):                              VNF prefix as string
            logger  (object):                               Logger Object
            tasks_by_target_record_id  (dict):              Task details
            net_list    (list):                             Net list of VDU
        """
        for iface_index, interface in enumerate(target_vdu["interfaces"]):
            net_text = Ns._check_vld_information_of_interfaces(
                interface, ns_preffix, vnf_preffix
            )
            if not net_text:
                # Interface not connected to any vld
                logger.error(
                    "Interface {} from vdu {} not connected to any vld".format(
                        iface_index, target_vdu["vdu-name"]
                    )
                )
                continue

            extra_dict["depends_on"].append(net_text)

            Ns._prepare_interface_port_security(interface)

            net_item = Ns._create_net_item_of_interface(interface, net_text)

            Ns._prepare_type_of_interface(
                interface, tasks_by_target_record_id, net_text, net_item
            )

            if interface.get("ip-address"):
                net_item["ip_address"] = interface["ip-address"]

            if interface.get("mac-address"):
                net_item["mac_address"] = interface["mac-address"]

            net_list.append(net_item)

            if interface.get("mgmt-vnf"):
                extra_dict["mgmt_vnf_interface"] = iface_index
            elif interface.get("mgmt-interface"):
                extra_dict["mgmt_vdu_interface"] = iface_index

    @staticmethod
    def _prepare_vdu_ssh_keys(
        target_vdu: dict, ro_nsr_public_key: dict, cloud_config: dict
    ) -> None:
        """Add ssh keys to cloud config.

        Args:
           target_vdu  (dict):                 Details of VDU to be created
           ro_nsr_public_key   (dict):          RO NSR public Key
           cloud_config  (dict):               Cloud config details

        """
        ssh_keys = []

        if target_vdu.get("ssh-keys"):
            ssh_keys += target_vdu.get("ssh-keys")

        if target_vdu.get("ssh-access-required"):
            ssh_keys.append(ro_nsr_public_key)

        if ssh_keys:
            cloud_config["key-pairs"] = ssh_keys

    @staticmethod
    def _select_persistent_root_disk(vsd: dict, vdu: dict) -> dict:
        """Selects the persistent root disk if exists.
        Args:
            vsd (dict):             Virtual storage descriptors in VNFD
            vdu (dict):             VNF descriptor

        Returns:
            root_disk   (dict):     Selected persistent root disk
        """
        if vsd.get("id") == vdu.get("virtual-storage-desc", [[]])[0]:
            root_disk = vsd
            if root_disk.get(
                "type-of-storage"
            ) == "persistent-storage:persistent-storage" and root_disk.get(
                "size-of-storage"
            ):
                return root_disk

    @staticmethod
    def _add_persistent_root_disk_to_disk_list(
        vnfd: dict, target_vdu: dict, persistent_root_disk: dict, disk_list: list
    ) -> None:
        """Find the persistent root disk and add to disk list.

        Args:
            vnfd  (dict):                           VNF descriptor
            target_vdu  (dict):                     Details of VDU to be created
            persistent_root_disk    (dict):         Details of persistent root disk
            disk_list   (list):                     Disks of VDU

        """
        for vdu in vnfd.get("vdu", ()):
            if vdu["name"] == target_vdu["vdu-name"]:
                for vsd in vnfd.get("virtual-storage-desc", ()):
                    root_disk = Ns._select_persistent_root_disk(vsd, vdu)
                    if not root_disk:
                        continue

                    persistent_root_disk[vsd["id"]] = {
                        "image_id": vdu.get("sw-image-desc"),
                        "size": root_disk["size-of-storage"],
                        "keep": Ns.is_volume_keeping_required(root_disk),
                    }
                    disk_list.append(persistent_root_disk[vsd["id"]])
                    break

    @staticmethod
    def _add_persistent_ordinary_disks_to_disk_list(
        target_vdu: dict,
        persistent_root_disk: dict,
        persistent_ordinary_disk: dict,
        disk_list: list,
        extra_dict: dict,
        vnf_id: str = None,
        nsr_id: str = None,
    ) -> None:
        """Fill the disk list by adding persistent ordinary disks.

        Args:
            target_vdu  (dict):                     Details of VDU to be created
            persistent_root_disk    (dict):         Details of persistent root disk
            persistent_ordinary_disk    (dict):     Details of persistent ordinary disk
            disk_list   (list):                     Disks of VDU

        """
        if target_vdu.get("virtual-storages"):
            for disk in target_vdu["virtual-storages"]:
                if (
                    disk.get("type-of-storage")
                    == "persistent-storage:persistent-storage"
                    and disk["id"] not in persistent_root_disk.keys()
                ):
                    name, multiattach = Ns.is_shared_volume(disk, vnf_id)
                    persistent_ordinary_disk[disk["id"]] = {
                        "name": name,
                        "size": disk["size-of-storage"],
                        "keep": Ns.is_volume_keeping_required(disk),
                        "multiattach": multiattach,
                    }
                    disk_list.append(persistent_ordinary_disk[disk["id"]])
                    if multiattach:  # VDU creation has to wait for shared volumes
                        extra_dict["depends_on"].append(
                            f"nsrs:{nsr_id}:shared-volumes.{name}"
                        )

    @staticmethod
    def _prepare_vdu_affinity_group_list(
        target_vdu: dict, extra_dict: dict, ns_preffix: str
    ) -> List[Dict[str, any]]:
        """Process affinity group details to prepare affinity group list.

        Args:
            target_vdu  (dict):     Details of VDU to be created
            extra_dict  (dict):     Dictionary to be filled
            ns_preffix  (str):      Prefix as string

        Returns:

            affinity_group_list (list):     Affinity group details

        """
        affinity_group_list = []

        if target_vdu.get("affinity-or-anti-affinity-group-id"):
            for affinity_group_id in target_vdu["affinity-or-anti-affinity-group-id"]:
                affinity_group = {}
                affinity_group_text = (
                    ns_preffix + ":affinity-or-anti-affinity-group." + affinity_group_id
                )

                if not isinstance(extra_dict.get("depends_on"), list):
                    raise NsException("Invalid extra_dict format.")

                extra_dict["depends_on"].append(affinity_group_text)
                affinity_group["affinity_group_id"] = "TASK-" + affinity_group_text
                affinity_group_list.append(affinity_group)

        return affinity_group_list

    @staticmethod
    def _process_vdu_params(
        target_vdu: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Function to process VDU parameters.

        Args:
            target_vdu (Dict[str, Any]): [description]
            indata (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        vnfr_id = kwargs.get("vnfr_id")
        nsr_id = kwargs.get("nsr_id")
        vnfr = kwargs.get("vnfr")
        vdu2cloud_init = kwargs.get("vdu2cloud_init")
        tasks_by_target_record_id = kwargs.get("tasks_by_target_record_id")
        logger = kwargs.get("logger")
        db = kwargs.get("db")
        fs = kwargs.get("fs")
        ro_nsr_public_key = kwargs.get("ro_nsr_public_key")

        vnf_preffix = "vnfrs:{}".format(vnfr_id)
        ns_preffix = "nsrs:{}".format(nsr_id)
        image_text = ns_preffix + ":image." + target_vdu["ns-image-id"]
        flavor_text = ns_preffix + ":flavor." + target_vdu["ns-flavor-id"]
        extra_dict = {"depends_on": [image_text, flavor_text]}
        net_list = []
        persistent_root_disk = {}
        persistent_ordinary_disk = {}
        vdu_instantiation_volumes_list = []
        disk_list = []
        vnfd_id = vnfr["vnfd-id"]
        vnfd = db.get_one("vnfds", {"_id": vnfd_id})
        # If the position info is provided for all the interfaces, it will be sorted
        # according to position number ascendingly.
        if all(
            True if i.get("position") is not None else False
            for i in target_vdu["interfaces"]
        ):
            Ns._sort_vdu_interfaces(target_vdu)

        # If the position info is provided for some interfaces but not all of them, the interfaces
        # which has specific position numbers will be placed and others' positions will not be taken care.
        else:
            Ns._partially_locate_vdu_interfaces(target_vdu)

        # If the position info is not provided for the interfaces, interfaces will be attached
        # according to the order in the VNFD.
        Ns._prepare_vdu_interfaces(
            target_vdu,
            extra_dict,
            ns_preffix,
            vnf_preffix,
            logger,
            tasks_by_target_record_id,
            net_list,
        )

        # cloud config
        cloud_config = Ns._prepare_vdu_cloud_init(target_vdu, vdu2cloud_init, db, fs)

        # Prepare VDU ssh keys
        Ns._prepare_vdu_ssh_keys(target_vdu, ro_nsr_public_key, cloud_config)

        if target_vdu.get("additionalParams"):
            vdu_instantiation_volumes_list = (
                target_vdu.get("additionalParams").get("OSM", {}).get("vdu_volumes")
            )

        if vdu_instantiation_volumes_list:
            # Find the root volumes and add to the disk_list
            persistent_root_disk = Ns.find_persistent_root_volumes(
                vnfd, target_vdu, vdu_instantiation_volumes_list, disk_list
            )

            # Find the ordinary volumes which are not added to the persistent_root_disk
            # and put them to the disk list
            Ns.find_persistent_volumes(
                persistent_root_disk,
                target_vdu,
                vdu_instantiation_volumes_list,
                disk_list,
            )

        else:
            # Vdu_instantiation_volumes_list is empty
            # First get add the persistent root disks to disk_list
            Ns._add_persistent_root_disk_to_disk_list(
                vnfd, target_vdu, persistent_root_disk, disk_list
            )
            # Add the persistent non-root disks to disk_list
            Ns._add_persistent_ordinary_disks_to_disk_list(
                target_vdu,
                persistent_root_disk,
                persistent_ordinary_disk,
                disk_list,
                extra_dict,
                vnfd["id"],
                nsr_id,
            )

        affinity_group_list = Ns._prepare_vdu_affinity_group_list(
            target_vdu, extra_dict, ns_preffix
        )

        extra_dict["params"] = {
            "name": "{}-{}-{}-{}".format(
                indata["name"][:16],
                vnfr["member-vnf-index-ref"][:16],
                target_vdu["vdu-name"][:32],
                target_vdu.get("count-index") or 0,
            ),
            "description": target_vdu["vdu-name"],
            "start": True,
            "image_id": "TASK-" + image_text,
            "flavor_id": "TASK-" + flavor_text,
            "affinity_group_list": affinity_group_list,
            "net_list": net_list,
            "cloud_config": cloud_config or None,
            "disk_list": disk_list,
            "availability_zone_index": None,  # TODO
            "availability_zone_list": None,  # TODO
        }
        return extra_dict

    @staticmethod
    def _process_shared_volumes_params(
        target_shared_volume: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        extra_dict = {}
        shared_volume_data = {
            "size": target_shared_volume["size-of-storage"],
            "name": target_shared_volume["id"],
            "type": target_shared_volume["type-of-storage"],
            "keep": Ns.is_volume_keeping_required(target_shared_volume),
        }
        extra_dict["params"] = shared_volume_data
        return extra_dict

    @staticmethod
    def _process_affinity_group_params(
        target_affinity_group: Dict[str, Any],
        indata: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Get affinity or anti-affinity group parameters.

        Args:
            target_affinity_group (Dict[str, Any]): [description]
            indata (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """

        extra_dict = {}
        affinity_group_data = {
            "name": target_affinity_group["name"],
            "type": target_affinity_group["type"],
            "scope": target_affinity_group["scope"],
        }

        if target_affinity_group.get("vim-affinity-group-id"):
            affinity_group_data["vim-affinity-group-id"] = target_affinity_group[
                "vim-affinity-group-id"
            ]

        extra_dict["params"] = {
            "affinity_group_data": affinity_group_data,
        }
        return extra_dict

    @staticmethod
    def _process_recreate_vdu_params(
        existing_vdu: Dict[str, Any],
        db_nsr: Dict[str, Any],
        vim_info: Dict[str, Any],
        target_record_id: str,
        target_id: str,
        **kwargs: Dict[str, Any],
    ) -> Dict[str, Any]:
        """Function to process VDU parameters to recreate.

        Args:
            existing_vdu (Dict[str, Any]): [description]
            db_nsr (Dict[str, Any]): [description]
            vim_info (Dict[str, Any]): [description]
            target_record_id (str): [description]
            target_id (str): [description]

        Returns:
            Dict[str, Any]: [description]
        """
        vnfr = kwargs.get("vnfr")
        vdu2cloud_init = kwargs.get("vdu2cloud_init")
        # logger = kwargs.get("logger")
        db = kwargs.get("db")
        fs = kwargs.get("fs")
        ro_nsr_public_key = kwargs.get("ro_nsr_public_key")

        extra_dict = {}
        net_list = []

        vim_details = {}
        vim_details_text = existing_vdu["vim_info"][target_id].get("vim_details", None)

        if vim_details_text:
            vim_details = yaml.safe_load(f"{vim_details_text}")

        for iface_index, interface in enumerate(existing_vdu["interfaces"]):
            if "port-security-enabled" in interface:
                interface["port_security"] = interface.pop("port-security-enabled")

            if "port-security-disable-strategy" in interface:
                interface["port_security_disable_strategy"] = interface.pop(
                    "port-security-disable-strategy"
                )

            net_item = {
                x: v
                for x, v in interface.items()
                if x
                in (
                    "name",
                    "vpci",
                    "port_security",
                    "port_security_disable_strategy",
                    "floating_ip",
                )
            }
            existing_ifaces = existing_vdu["vim_info"][target_id].get(
                "interfaces_backup", []
            )
            net_id = next(
                (
                    i["vim_net_id"]
                    for i in existing_ifaces
                    if i["ip_address"] == interface["ip-address"]
                ),
                None,
            )

            net_item["net_id"] = net_id
            net_item["type"] = "virtual"

            # TODO mac_address: used for  SR-IOV ifaces #TODO for other types
            # TODO floating_ip: True/False (or it can be None)
            if interface.get("type") in ("SR-IOV", "PCI-PASSTHROUGH"):
                net_item["use"] = "data"
                net_item["model"] = interface["type"]
                net_item["type"] = interface["type"]
            elif (
                interface.get("type") == "OM-MGMT"
                or interface.get("mgmt-interface")
                or interface.get("mgmt-vnf")
            ):
                net_item["use"] = "mgmt"
            else:
                # if interface.get("type") in ("VIRTIO", "E1000", "PARAVIRT"):
                net_item["use"] = "bridge"
                net_item["model"] = interface.get("type")

            if interface.get("ip-address"):
                net_item["ip_address"] = interface["ip-address"]

            if interface.get("mac-address"):
                net_item["mac_address"] = interface["mac-address"]

            net_list.append(net_item)

            if interface.get("mgmt-vnf"):
                extra_dict["mgmt_vnf_interface"] = iface_index
            elif interface.get("mgmt-interface"):
                extra_dict["mgmt_vdu_interface"] = iface_index

        # cloud config
        cloud_config = {}

        if existing_vdu.get("cloud-init"):
            if existing_vdu["cloud-init"] not in vdu2cloud_init:
                vdu2cloud_init[existing_vdu["cloud-init"]] = Ns._get_cloud_init(
                    db=db,
                    fs=fs,
                    location=existing_vdu["cloud-init"],
                )

            cloud_content_ = vdu2cloud_init[existing_vdu["cloud-init"]]
            cloud_config["user-data"] = Ns._parse_jinja2(
                cloud_init_content=cloud_content_,
                params=existing_vdu.get("additionalParams"),
                context=existing_vdu["cloud-init"],
            )

        if existing_vdu.get("boot-data-drive"):
            cloud_config["boot-data-drive"] = existing_vdu.get("boot-data-drive")

        ssh_keys = []

        if existing_vdu.get("ssh-keys"):
            ssh_keys += existing_vdu.get("ssh-keys")

        if existing_vdu.get("ssh-access-required"):
            ssh_keys.append(ro_nsr_public_key)

        if ssh_keys:
            cloud_config["key-pairs"] = ssh_keys

        disk_list = []
        for vol_id in vim_details.get("os-extended-volumes:volumes_attached", []):
            disk_list.append({"vim_id": vol_id["id"]})

        affinity_group_list = []

        if existing_vdu.get("affinity-or-anti-affinity-group-id"):
            affinity_group = {}
            for affinity_group_id in existing_vdu["affinity-or-anti-affinity-group-id"]:
                for group in db_nsr.get("affinity-or-anti-affinity-group"):
                    if (
                        group["id"] == affinity_group_id
                        and group["vim_info"][target_id].get("vim_id", None) is not None
                    ):
                        affinity_group["affinity_group_id"] = group["vim_info"][
                            target_id
                        ].get("vim_id", None)
                        affinity_group_list.append(affinity_group)

        extra_dict["params"] = {
            "name": "{}-{}-{}-{}".format(
                db_nsr["name"][:16],
                vnfr["member-vnf-index-ref"][:16],
                existing_vdu["vdu-name"][:32],
                existing_vdu.get("count-index") or 0,
            ),
            "description": existing_vdu["vdu-name"],
            "start": True,
            "image_id": vim_details["image"]["id"],
            "flavor_id": vim_details["flavor"]["id"],
            "affinity_group_list": affinity_group_list,
            "net_list": net_list,
            "cloud_config": cloud_config or None,
            "disk_list": disk_list,
            "availability_zone_index": None,  # TODO
            "availability_zone_list": None,  # TODO
        }

        return extra_dict

    def calculate_diff_items(
        self,
        indata,
        db_nsr,
        db_ro_nsr,
        db_nsr_update,
        item,
        tasks_by_target_record_id,
        action_id,
        nsr_id,
        task_index,
        vnfr_id=None,
        vnfr=None,
    ):
        """Function that returns the incremental changes (creation, deletion)
        related to a specific item `item` to be done. This function should be
        called for NS instantiation, NS termination, NS update to add a new VNF
        or a new VLD, remove a VNF or VLD, etc.
        Item can be `net`, `flavor`, `image` or `vdu`.
        It takes a list of target items from indata (which came from the REST API)
        and compares with the existing items from db_ro_nsr, identifying the
        incremental changes to be done. During the comparison, it calls the method
        `process_params` (which was passed as parameter, and is particular for each
        `item`)

        Args:
            indata (Dict[str, Any]): deployment info
            db_nsr: NSR record from DB
            db_ro_nsr (Dict[str, Any]): record from "ro_nsrs"
            db_nsr_update (Dict[str, Any]): NSR info to update in DB
            item (str): element to process (net, vdu...)
            tasks_by_target_record_id (Dict[str, Any]):
                [<target_record_id>, <task>]
            action_id (str): action id
            nsr_id (str): NSR id
            task_index (number): task index to add to task name
            vnfr_id (str): VNFR id
            vnfr (Dict[str, Any]): VNFR info

        Returns:
            List: list with the incremental changes (deletes, creates) for each item
            number: current task index
        """

        diff_items = []
        db_path = ""
        db_record = ""
        target_list = []
        existing_list = []
        process_params = None
        vdu2cloud_init = indata.get("cloud_init_content") or {}
        ro_nsr_public_key = db_ro_nsr["public_key"]
        # According to the type of item, the path, the target_list,
        # the existing_list and the method to process params are set
        db_path = self.db_path_map[item]
        process_params = self.process_params_function_map[item]

        if item in ("sfp", "classification", "sf", "sfi"):
            db_record = "nsrs:{}:{}".format(nsr_id, db_path)
            target_vnffg = indata.get("vnffg", [])[0]
            target_list = target_vnffg[item]
            existing_list = db_nsr.get(item, [])
        elif item in ("net", "vdu"):
            # This case is specific for the NS VLD (not applied to VDU)
            if vnfr is None:
                db_record = "nsrs:{}:{}".format(nsr_id, db_path)
                target_list = indata.get("ns", []).get(db_path, [])
                existing_list = db_nsr.get(db_path, [])
            # This case is common for VNF VLDs and VNF VDUs
            else:
                db_record = "vnfrs:{}:{}".format(vnfr_id, db_path)
                target_vnf = next(
                    (vnf for vnf in indata.get("vnf", ()) if vnf["_id"] == vnfr_id),
                    None,
                )
                target_list = target_vnf.get(db_path, []) if target_vnf else []
                existing_list = vnfr.get(db_path, [])
        elif item in (
            "image",
            "flavor",
            "affinity-or-anti-affinity-group",
            "shared-volumes",
        ):
            db_record = "nsrs:{}:{}".format(nsr_id, db_path)
            target_list = indata.get(item, [])
            existing_list = db_nsr.get(item, [])
        else:
            raise NsException("Item not supported: {}", item)
        # ensure all the target_list elements has an "id". If not assign the index as id
        if target_list is None:
            target_list = []
        for target_index, tl in enumerate(target_list):
            if tl and not tl.get("id"):
                tl["id"] = str(target_index)
        # step 1 items (networks,vdus,...) to be deleted/updated
        for item_index, existing_item in enumerate(existing_list):
            target_item = next(
                (t for t in target_list if t["id"] == existing_item["id"]),
                None,
            )
            for target_vim, existing_viminfo in existing_item.get(
                "vim_info", {}
            ).items():
                if existing_viminfo is None:
                    continue

                if target_item:
                    target_viminfo = target_item.get("vim_info", {}).get(target_vim)
                else:
                    target_viminfo = None

                if target_viminfo is None:
                    # must be deleted
                    self._assign_vim(target_vim)
                    target_record_id = "{}.{}".format(db_record, existing_item["id"])
                    item_ = item

                    if target_vim.startswith("sdn") or target_vim.startswith("wim"):
                        # item must be sdn-net instead of net if target_vim is a sdn
                        item_ = "sdn_net"
                        target_record_id += ".sdn"

                    deployment_info = {
                        "action_id": action_id,
                        "nsr_id": nsr_id,
                        "task_index": task_index,
                    }

                    diff_items.append(
                        {
                            "deployment_info": deployment_info,
                            "target_id": target_vim,
                            "item": item_,
                            "action": "DELETE",
                            "target_record": f"{db_record}.{item_index}.vim_info.{target_vim}",
                            "target_record_id": target_record_id,
                        }
                    )
                    task_index += 1

        # step 2 items (networks,vdus,...) to be created
        for target_item in target_list:
            item_index = -1
            for item_index, existing_item in enumerate(existing_list):
                if existing_item["id"] == target_item["id"]:
                    break
            else:
                item_index += 1
                db_nsr_update[db_path + ".{}".format(item_index)] = target_item
                existing_list.append(target_item)
                existing_item = None

            for target_vim, target_viminfo in target_item.get("vim_info", {}).items():
                existing_viminfo = None

                if existing_item:
                    existing_viminfo = existing_item.get("vim_info", {}).get(target_vim)

                if existing_viminfo is not None:
                    continue

                target_record_id = "{}.{}".format(db_record, target_item["id"])
                item_ = item

                if target_vim.startswith("sdn") or target_vim.startswith("wim"):
                    # item must be sdn-net instead of net if target_vim is a sdn
                    item_ = "sdn_net"
                    target_record_id += ".sdn"

                kwargs = {}
                self.logger.debug(
                    "ns.calculate_diff_items target_item={}".format(target_item)
                )
                if process_params == Ns._process_flavor_params:
                    kwargs.update(
                        {
                            "db": self.db,
                        }
                    )
                    self.logger.debug(
                        "calculate_diff_items for flavor kwargs={}".format(kwargs)
                    )

                if process_params == Ns._process_vdu_params:
                    self.logger.debug("calculate_diff_items self.fs={}".format(self.fs))
                    kwargs.update(
                        {
                            "vnfr_id": vnfr_id,
                            "nsr_id": nsr_id,
                            "vnfr": vnfr,
                            "vdu2cloud_init": vdu2cloud_init,
                            "tasks_by_target_record_id": tasks_by_target_record_id,
                            "logger": self.logger,
                            "db": self.db,
                            "fs": self.fs,
                            "ro_nsr_public_key": ro_nsr_public_key,
                        }
                    )
                    self.logger.debug("calculate_diff_items kwargs={}".format(kwargs))
                if (
                    process_params == Ns._process_sfi_params
                    or Ns._process_sf_params
                    or Ns._process_classification_params
                    or Ns._process_sfp_params
                ):
                    kwargs.update({"nsr_id": nsr_id, "db": self.db})

                    self.logger.debug("calculate_diff_items kwargs={}".format(kwargs))

                extra_dict = process_params(
                    target_item,
                    indata,
                    target_viminfo,
                    target_record_id,
                    **kwargs,
                )
                self._assign_vim(target_vim)

                deployment_info = {
                    "action_id": action_id,
                    "nsr_id": nsr_id,
                    "task_index": task_index,
                }

                new_item = {
                    "deployment_info": deployment_info,
                    "target_id": target_vim,
                    "item": item_,
                    "action": "CREATE",
                    "target_record": f"{db_record}.{item_index}.vim_info.{target_vim}",
                    "target_record_id": target_record_id,
                    "extra_dict": extra_dict,
                    "common_id": target_item.get("common_id", None),
                }
                diff_items.append(new_item)
                tasks_by_target_record_id[target_record_id] = new_item
                task_index += 1

                db_nsr_update[db_path + ".{}".format(item_index)] = target_item

        return diff_items, task_index

    def _process_vnfgd_sfp(self, sfp):
        processed_sfp = {}
        # getting sfp name, sfs and classifications in sfp to store it in processed_sfp
        processed_sfp["id"] = sfp["id"]
        sfs_in_sfp = [
            sf["id"] for sf in sfp.get("position-desc-id", [])[0].get("cp-profile-id")
        ]
        classifications_in_sfp = [
            classi["id"]
            for classi in sfp.get("position-desc-id", [])[0].get("match-attributes")
        ]

        # creating a list of sfp with sfs and classifications
        processed_sfp["sfs"] = sfs_in_sfp
        processed_sfp["classifications"] = classifications_in_sfp

        return processed_sfp

    def _process_vnfgd_sf(self, sf):
        processed_sf = {}
        # getting name of sf
        processed_sf["id"] = sf["id"]
        # getting sfis in sf
        sfis_in_sf = sf.get("constituent-profile-elements")
        sorted_sfis = sorted(sfis_in_sf, key=lambda i: i["order"])
        # getting sfis names
        processed_sf["sfis"] = [sfi["id"] for sfi in sorted_sfis]

        return processed_sf

    def _process_vnfgd_sfi(self, sfi, db_vnfrs):
        processed_sfi = {}
        # getting name of sfi
        processed_sfi["id"] = sfi["id"]

        # getting ports in sfi
        ingress_port = sfi["ingress-constituent-cpd-id"]
        egress_port = sfi["egress-constituent-cpd-id"]
        sfi_vnf_member_index = sfi["constituent-base-element-id"]

        processed_sfi["ingress_port"] = ingress_port
        processed_sfi["egress_port"] = egress_port

        all_vnfrs = db_vnfrs.values()

        sfi_vnfr = [
            element
            for element in all_vnfrs
            if element["member-vnf-index-ref"] == sfi_vnf_member_index
        ]
        processed_sfi["vnfr_id"] = sfi_vnfr[0]["id"]

        sfi_vnfr_cp = sfi_vnfr[0]["connection-point"]

        ingress_port_index = [
            c for c, element in enumerate(sfi_vnfr_cp) if element["id"] == ingress_port
        ]
        ingress_port_index = ingress_port_index[0]

        processed_sfi["vdur_id"] = sfi_vnfr_cp[ingress_port_index][
            "connection-point-vdu-id"
        ]
        processed_sfi["ingress_port_index"] = ingress_port_index
        processed_sfi["egress_port_index"] = ingress_port_index

        if egress_port != ingress_port:
            egress_port_index = [
                c
                for c, element in enumerate(sfi_vnfr_cp)
                if element["id"] == egress_port
            ]
            processed_sfi["egress_port_index"] = egress_port_index

        return processed_sfi

    def _process_vnfgd_classification(self, classification, db_vnfrs):
        processed_classification = {}

        processed_classification = deepcopy(classification)
        classi_vnf_member_index = processed_classification[
            "constituent-base-element-id"
        ]
        logical_source_port = processed_classification["constituent-cpd-id"]

        all_vnfrs = db_vnfrs.values()

        classi_vnfr = [
            element
            for element in all_vnfrs
            if element["member-vnf-index-ref"] == classi_vnf_member_index
        ]
        processed_classification["vnfr_id"] = classi_vnfr[0]["id"]

        classi_vnfr_cp = classi_vnfr[0]["connection-point"]

        ingress_port_index = [
            c
            for c, element in enumerate(classi_vnfr_cp)
            if element["id"] == logical_source_port
        ]
        ingress_port_index = ingress_port_index[0]

        processed_classification["ingress_port_index"] = ingress_port_index
        processed_classification["vdur_id"] = classi_vnfr_cp[ingress_port_index][
            "connection-point-vdu-id"
        ]

        return processed_classification

    def _update_db_nsr_with_vnffg(self, processed_vnffg, vim_info, nsr_id):
        """This method used to add viminfo dict to sfi, sf sfp and classification in indata and count info in db_nsr.

        Args:
            processed_vnffg (Dict[str, Any]): deployment info
            vim_info (Dict): dictionary to store VIM resource information
            nsr_id (str): NSR id

        Returns: None
        """

        nsr_sfi = {}
        nsr_sf = {}
        nsr_sfp = {}
        nsr_classification = {}
        db_nsr_vnffg = deepcopy(processed_vnffg)

        for count, sfi in enumerate(processed_vnffg["sfi"]):
            sfi["vim_info"] = vim_info
            sfi_count = "sfi.{}".format(count)
            nsr_sfi[sfi_count] = db_nsr_vnffg["sfi"][count]

        self.db.set_list("nsrs", {"_id": nsr_id}, nsr_sfi)

        for count, sf in enumerate(processed_vnffg["sf"]):
            sf["vim_info"] = vim_info
            sf_count = "sf.{}".format(count)
            nsr_sf[sf_count] = db_nsr_vnffg["sf"][count]

        self.db.set_list("nsrs", {"_id": nsr_id}, nsr_sf)

        for count, sfp in enumerate(processed_vnffg["sfp"]):
            sfp["vim_info"] = vim_info
            sfp_count = "sfp.{}".format(count)
            nsr_sfp[sfp_count] = db_nsr_vnffg["sfp"][count]

        self.db.set_list("nsrs", {"_id": nsr_id}, nsr_sfp)

        for count, classi in enumerate(processed_vnffg["classification"]):
            classi["vim_info"] = vim_info
            classification_count = "classification.{}".format(count)
            nsr_classification[classification_count] = db_nsr_vnffg["classification"][
                count
            ]

            self.db.set_list("nsrs", {"_id": nsr_id}, nsr_classification)

    def process_vnffgd_descriptor(
        self,
        indata: dict,
        nsr_id: str,
        db_nsr: dict,
        db_vnfrs: dict,
    ) -> dict:
        """This method used to process vnffgd parameters from descriptor.

        Args:
            indata (Dict[str, Any]): deployment info
            nsr_id (str): NSR id
            db_nsr: NSR record from DB
            db_vnfrs: VNFRS record from DB

        Returns:
            Dict: Processed vnffg parameters.
        """

        processed_vnffg = {}
        vnffgd = db_nsr.get("nsd", {}).get("vnffgd")
        vnf_list = indata.get("vnf", [])
        vim_text = ""

        if vnf_list:
            vim_text = "vim:" + vnf_list[0].get("vim-account-id", "")

        vim_info = {}
        vim_info[vim_text] = {}
        processed_sfps = []
        processed_classifications = []
        processed_sfs = []
        processed_sfis = []

        # setting up intial empty entries for vnffg items in mongodb.
        self.db.set_list(
            "nsrs",
            {"_id": nsr_id},
            {
                "sfi": [],
                "sf": [],
                "sfp": [],
                "classification": [],
            },
        )

        vnffg = vnffgd[0]
        # getting sfps
        sfps = vnffg.get("nfpd")
        for sfp in sfps:
            processed_sfp = self._process_vnfgd_sfp(sfp)
            # appending the list of processed sfps
            processed_sfps.append(processed_sfp)

            # getting sfs in sfp
            sfs = sfp.get("position-desc-id")[0].get("cp-profile-id")
            for sf in sfs:
                processed_sf = self._process_vnfgd_sf(sf)

                # appending the list of processed sfs
                processed_sfs.append(processed_sf)

                # getting sfis in sf
                sfis_in_sf = sf.get("constituent-profile-elements")
                sorted_sfis = sorted(sfis_in_sf, key=lambda i: i["order"])

                for sfi in sorted_sfis:
                    processed_sfi = self._process_vnfgd_sfi(sfi, db_vnfrs)

                    processed_sfis.append(processed_sfi)

            classifications = sfp.get("position-desc-id")[0].get("match-attributes")
            # getting classifications from sfp
            for classification in classifications:
                processed_classification = self._process_vnfgd_classification(
                    classification, db_vnfrs
                )

                processed_classifications.append(processed_classification)

        processed_vnffg["sfi"] = processed_sfis
        processed_vnffg["sf"] = processed_sfs
        processed_vnffg["classification"] = processed_classifications
        processed_vnffg["sfp"] = processed_sfps

        # adding viminfo dict to sfi, sf sfp and classification
        self._update_db_nsr_with_vnffg(processed_vnffg, vim_info, nsr_id)

        # updating indata with vnffg porcessed parameters
        indata["vnffg"].append(processed_vnffg)

    def calculate_all_differences_to_deploy(
        self,
        indata,
        nsr_id,
        db_nsr,
        db_vnfrs,
        db_ro_nsr,
        db_nsr_update,
        db_vnfrs_update,
        action_id,
        tasks_by_target_record_id,
    ):
        """This method calculates the ordered list of items (`changes_list`)
        to be created and deleted.

        Args:
            indata (Dict[str, Any]): deployment info
            nsr_id (str): NSR id
            db_nsr: NSR record from DB
            db_vnfrs: VNFRS record from DB
            db_ro_nsr (Dict[str, Any]): record from "ro_nsrs"
            db_nsr_update (Dict[str, Any]): NSR info to update in DB
            db_vnfrs_update (Dict[str, Any]): VNFRS info to update in DB
            action_id (str): action id
            tasks_by_target_record_id (Dict[str, Any]):
                [<target_record_id>, <task>]

        Returns:
            List: ordered list of items to be created and deleted.
        """

        task_index = 0
        # set list with diffs:
        changes_list = []

        # processing vnffg from descriptor parameter
        vnffgd = db_nsr.get("nsd").get("vnffgd")
        if vnffgd is not None:
            indata["vnffg"] = []
            vnf_list = indata["vnf"]
            processed_vnffg = {}

            # in case of ns-delete
            if not vnf_list:
                processed_vnffg["sfi"] = []
                processed_vnffg["sf"] = []
                processed_vnffg["classification"] = []
                processed_vnffg["sfp"] = []

                indata["vnffg"].append(processed_vnffg)

            else:
                self.process_vnffgd_descriptor(
                    indata=indata,
                    nsr_id=nsr_id,
                    db_nsr=db_nsr,
                    db_vnfrs=db_vnfrs,
                )

                # getting updated db_nsr having vnffg parameters
                db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})

                self.logger.debug(
                    "After processing vnffd parameters indata={} nsr={}".format(
                        indata, db_nsr
                    )
                )

            for item in ["sfp", "classification", "sf", "sfi"]:
                self.logger.debug("process NS={} {}".format(nsr_id, item))
                diff_items, task_index = self.calculate_diff_items(
                    indata=indata,
                    db_nsr=db_nsr,
                    db_ro_nsr=db_ro_nsr,
                    db_nsr_update=db_nsr_update,
                    item=item,
                    tasks_by_target_record_id=tasks_by_target_record_id,
                    action_id=action_id,
                    nsr_id=nsr_id,
                    task_index=task_index,
                    vnfr_id=None,
                )
                changes_list += diff_items

        # NS vld, image and flavor
        for item in [
            "net",
            "image",
            "flavor",
            "affinity-or-anti-affinity-group",
        ]:
            self.logger.debug("process NS={} {}".format(nsr_id, item))
            diff_items, task_index = self.calculate_diff_items(
                indata=indata,
                db_nsr=db_nsr,
                db_ro_nsr=db_ro_nsr,
                db_nsr_update=db_nsr_update,
                item=item,
                tasks_by_target_record_id=tasks_by_target_record_id,
                action_id=action_id,
                nsr_id=nsr_id,
                task_index=task_index,
                vnfr_id=None,
            )
            changes_list += diff_items

        # VNF vlds and vdus
        for vnfr_id, vnfr in db_vnfrs.items():
            # vnfr_id need to be set as global variable for among others nested method _process_vdu_params
            for item in ["net", "vdu", "shared-volumes"]:
                self.logger.debug("process VNF={} {}".format(vnfr_id, item))
                diff_items, task_index = self.calculate_diff_items(
                    indata=indata,
                    db_nsr=db_nsr,
                    db_ro_nsr=db_ro_nsr,
                    db_nsr_update=db_vnfrs_update[vnfr["_id"]],
                    item=item,
                    tasks_by_target_record_id=tasks_by_target_record_id,
                    action_id=action_id,
                    nsr_id=nsr_id,
                    task_index=task_index,
                    vnfr_id=vnfr_id,
                    vnfr=vnfr,
                )
                changes_list += diff_items

        return changes_list

    def define_all_tasks(
        self,
        changes_list,
        db_new_tasks,
        tasks_by_target_record_id,
    ):
        """Function to create all the task structures obtanied from
        the method calculate_all_differences_to_deploy

        Args:
            changes_list (List): ordered list of items to be created or deleted
            db_new_tasks (List): tasks list to be created
            action_id (str): action id
            tasks_by_target_record_id (Dict[str, Any]):
                [<target_record_id>, <task>]

        """

        for change in changes_list:
            task = Ns._create_task(
                deployment_info=change["deployment_info"],
                target_id=change["target_id"],
                item=change["item"],
                action=change["action"],
                target_record=change["target_record"],
                target_record_id=change["target_record_id"],
                extra_dict=change.get("extra_dict", None),
            )

            self.logger.debug("ns.define_all_tasks task={}".format(task))
            tasks_by_target_record_id[change["target_record_id"]] = task
            db_new_tasks.append(task)

            if change.get("common_id"):
                task["common_id"] = change["common_id"]

    def upload_all_tasks(
        self,
        db_new_tasks,
        now,
    ):
        """Function to save all tasks in the common DB

        Args:
            db_new_tasks (List): tasks list to be created
            now (time): current time

        """

        nb_ro_tasks = 0  # for logging

        for db_task in db_new_tasks:
            target_id = db_task.pop("target_id")
            common_id = db_task.get("common_id")

            # Do not chek tasks with vim_status DELETED
            # because in manual heealing there are two tasks for the same vdur:
            #   one with vim_status deleted and the other one with the actual VM status.

            if common_id:
                if self.db.set_one(
                    "ro_tasks",
                    q_filter={
                        "target_id": target_id,
                        "tasks.common_id": common_id,
                        "vim_info.vim_status.ne": "DELETED",
                    },
                    update_dict={"to_check_at": now, "modified_at": now},
                    push={"tasks": db_task},
                    fail_on_empty=False,
                ):
                    continue

            if not self.db.set_one(
                "ro_tasks",
                q_filter={
                    "target_id": target_id,
                    "tasks.target_record": db_task["target_record"],
                    "vim_info.vim_status.ne": "DELETED",
                },
                update_dict={"to_check_at": now, "modified_at": now},
                push={"tasks": db_task},
                fail_on_empty=False,
            ):
                # Create a ro_task
                self.logger.debug("Updating database, Creating ro_tasks")
                db_ro_task = Ns._create_ro_task(target_id, db_task)
                nb_ro_tasks += 1
                self.db.create("ro_tasks", db_ro_task)

        self.logger.debug(
            "Created {} ro_tasks; {} tasks - db_new_tasks={}".format(
                nb_ro_tasks, len(db_new_tasks), db_new_tasks
            )
        )

    def upload_recreate_tasks(
        self,
        db_new_tasks,
        now,
    ):
        """Function to save recreate tasks in the common DB

        Args:
            db_new_tasks (List): tasks list to be created
            now (time): current time

        """

        nb_ro_tasks = 0  # for logging

        for db_task in db_new_tasks:
            target_id = db_task.pop("target_id")
            self.logger.debug("target_id={} db_task={}".format(target_id, db_task))

            action = db_task.get("action", None)

            # Create a ro_task
            self.logger.debug("Updating database, Creating ro_tasks")
            db_ro_task = Ns._create_ro_task(target_id, db_task)

            # If DELETE task: the associated created items should be removed
            # (except persistent volumes):
            if action == "DELETE":
                db_ro_task["vim_info"]["created"] = True
                db_ro_task["vim_info"]["created_items"] = db_task.get(
                    "created_items", {}
                )
                db_ro_task["vim_info"]["volumes_to_hold"] = db_task.get(
                    "volumes_to_hold", []
                )
                db_ro_task["vim_info"]["vim_id"] = db_task.get("vim_id", None)

            nb_ro_tasks += 1
            self.logger.debug("upload_all_tasks db_ro_task={}".format(db_ro_task))
            self.db.create("ro_tasks", db_ro_task)

        self.logger.debug(
            "Created {} ro_tasks; {} tasks - db_new_tasks={}".format(
                nb_ro_tasks, len(db_new_tasks), db_new_tasks
            )
        )

    def _prepare_created_items_for_healing(
        self,
        nsr_id,
        target_record,
    ):
        created_items = {}
        # Get created_items from ro_task
        ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
        for ro_task in ro_tasks:
            for task in ro_task["tasks"]:
                if (
                    task["target_record"] == target_record
                    and task["action"] == "CREATE"
                    and ro_task["vim_info"]["created_items"]
                ):
                    created_items = ro_task["vim_info"]["created_items"]
                    break

        return created_items

    def _prepare_persistent_volumes_for_healing(
        self,
        target_id,
        existing_vdu,
    ):
        # The associated volumes of the VM shouldn't be removed
        volumes_list = []
        vim_details = {}
        vim_details_text = existing_vdu["vim_info"][target_id].get("vim_details", None)
        if vim_details_text:
            vim_details = yaml.safe_load(f"{vim_details_text}")

            for vol_id in vim_details.get("os-extended-volumes:volumes_attached", []):
                volumes_list.append(vol_id["id"])

        return volumes_list

    def prepare_changes_to_recreate(
        self,
        indata,
        nsr_id,
        db_nsr,
        db_vnfrs,
        db_ro_nsr,
        action_id,
        tasks_by_target_record_id,
    ):
        """This method will obtain an ordered list of items (`changes_list`)
        to be created and deleted to meet the recreate request.
        """

        self.logger.debug(
            "ns.prepare_changes_to_recreate nsr_id={} indata={}".format(nsr_id, indata)
        )

        task_index = 0
        # set list with diffs:
        changes_list = []
        db_path = self.db_path_map["vdu"]
        target_list = indata.get("healVnfData", {})
        vdu2cloud_init = indata.get("cloud_init_content") or {}
        ro_nsr_public_key = db_ro_nsr["public_key"]

        # Check each VNF of the target
        for target_vnf in target_list:
            # Find this VNF in the list from DB, raise exception if vnfInstanceId is not found
            vnfr_id = target_vnf["vnfInstanceId"]
            existing_vnf = db_vnfrs.get(vnfr_id, {})
            db_record = "vnfrs:{}:{}".format(vnfr_id, db_path)
            # vim_account_id = existing_vnf.get("vim-account-id", "")

            target_vdus = target_vnf.get("additionalParams", {}).get("vdu", [])
            # Check each VDU of this VNF
            if not target_vdus:
                # Create target_vdu_list from DB, if VDUs are not specified
                target_vdus = []
                for existing_vdu in existing_vnf.get("vdur"):
                    vdu_name = existing_vdu.get("vdu-name", None)
                    vdu_index = existing_vdu.get("count-index", 0)
                    vdu_to_be_healed = {"vdu-id": vdu_name, "count-index": vdu_index}
                    target_vdus.append(vdu_to_be_healed)
            for target_vdu in target_vdus:
                vdu_name = target_vdu.get("vdu-id", None)
                # For multi instance VDU count-index is mandatory
                # For single session VDU count-indes is 0
                count_index = target_vdu.get("count-index", 0)
                item_index = 0
                existing_instance = {}
                if existing_vnf:
                    for instance in existing_vnf.get("vdur", {}):
                        if (
                            instance["vdu-name"] == vdu_name
                            and instance["count-index"] == count_index
                        ):
                            existing_instance = instance
                            break
                        else:
                            item_index += 1

                target_record_id = "{}.{}".format(db_record, existing_instance["id"])

                # The target VIM is the one already existing in DB to recreate
                for target_vim, target_viminfo in existing_instance.get(
                    "vim_info", {}
                ).items():
                    # step 1 vdu to be deleted
                    self._assign_vim(target_vim)
                    deployment_info = {
                        "action_id": action_id,
                        "nsr_id": nsr_id,
                        "task_index": task_index,
                    }

                    target_record = f"{db_record}.{item_index}.vim_info.{target_vim}"
                    created_items = self._prepare_created_items_for_healing(
                        nsr_id, target_record
                    )

                    volumes_to_hold = self._prepare_persistent_volumes_for_healing(
                        target_vim, existing_instance
                    )

                    # Specific extra params for recreate tasks:
                    extra_dict = {
                        "created_items": created_items,
                        "vim_id": existing_instance["vim-id"],
                        "volumes_to_hold": volumes_to_hold,
                    }

                    changes_list.append(
                        {
                            "deployment_info": deployment_info,
                            "target_id": target_vim,
                            "item": "vdu",
                            "action": "DELETE",
                            "target_record": target_record,
                            "target_record_id": target_record_id,
                            "extra_dict": extra_dict,
                        }
                    )
                    delete_task_id = f"{action_id}:{task_index}"
                    task_index += 1

                    # step 2 vdu to be created
                    kwargs = {}
                    kwargs.update(
                        {
                            "vnfr_id": vnfr_id,
                            "nsr_id": nsr_id,
                            "vnfr": existing_vnf,
                            "vdu2cloud_init": vdu2cloud_init,
                            "tasks_by_target_record_id": tasks_by_target_record_id,
                            "logger": self.logger,
                            "db": self.db,
                            "fs": self.fs,
                            "ro_nsr_public_key": ro_nsr_public_key,
                        }
                    )

                    extra_dict = self._process_recreate_vdu_params(
                        existing_instance,
                        db_nsr,
                        target_viminfo,
                        target_record_id,
                        target_vim,
                        **kwargs,
                    )

                    # The CREATE task depens on the DELETE task
                    extra_dict["depends_on"] = [delete_task_id]

                    # Add volumes created from created_items if any
                    # Ports should be deleted with delete task and automatically created with create task
                    volumes = {}
                    for k, v in created_items.items():
                        try:
                            k_item, _, k_id = k.partition(":")
                            if k_item == "volume":
                                volumes[k] = v
                        except Exception as e:
                            self.logger.error(
                                "Error evaluating created item {}: {}".format(k, e)
                            )
                    extra_dict["previous_created_volumes"] = volumes

                    deployment_info = {
                        "action_id": action_id,
                        "nsr_id": nsr_id,
                        "task_index": task_index,
                    }
                    self._assign_vim(target_vim)

                    new_item = {
                        "deployment_info": deployment_info,
                        "target_id": target_vim,
                        "item": "vdu",
                        "action": "CREATE",
                        "target_record": target_record,
                        "target_record_id": target_record_id,
                        "extra_dict": extra_dict,
                    }
                    changes_list.append(new_item)
                    tasks_by_target_record_id[target_record_id] = new_item
                    task_index += 1

        return changes_list

    def recreate(self, session, indata, version, nsr_id, *args, **kwargs):
        self.logger.debug("ns.recreate nsr_id={} indata={}".format(nsr_id, indata))
        # TODO: validate_input(indata, recreate_schema)
        action_id = indata.get("action_id", str(uuid4()))
        # get current deployment
        db_vnfrs = {}  # vnf's info indexed by _id
        step = ""
        logging_text = "Recreate nsr_id={} action_id={} indata={}".format(
            nsr_id, action_id, indata
        )
        self.logger.debug(logging_text + "Enter")

        try:
            step = "Getting ns and vnfr record from db"
            db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
            db_new_tasks = []
            tasks_by_target_record_id = {}
            # read from db: vnf's of this ns
            step = "Getting vnfrs from db"
            db_vnfrs_list = self.db.get_list("vnfrs", {"nsr-id-ref": nsr_id})
            self.logger.debug("ns.recreate: db_vnfrs_list={}".format(db_vnfrs_list))

            if not db_vnfrs_list:
                raise NsException("Cannot obtain associated VNF for ns")

            for vnfr in db_vnfrs_list:
                db_vnfrs[vnfr["_id"]] = vnfr

            now = time()
            db_ro_nsr = self.db.get_one("ro_nsrs", {"_id": nsr_id}, fail_on_empty=False)
            self.logger.debug("ns.recreate: db_ro_nsr={}".format(db_ro_nsr))

            if not db_ro_nsr:
                db_ro_nsr = self._create_db_ro_nsrs(nsr_id, now)

            with self.write_lock:
                # NS
                step = "process NS elements"
                changes_list = self.prepare_changes_to_recreate(
                    indata=indata,
                    nsr_id=nsr_id,
                    db_nsr=db_nsr,
                    db_vnfrs=db_vnfrs,
                    db_ro_nsr=db_ro_nsr,
                    action_id=action_id,
                    tasks_by_target_record_id=tasks_by_target_record_id,
                )

                self.define_all_tasks(
                    changes_list=changes_list,
                    db_new_tasks=db_new_tasks,
                    tasks_by_target_record_id=tasks_by_target_record_id,
                )

                # Delete all ro_tasks registered for the targets vdurs (target_record)
                # If task of type CREATE exist then vim will try to get info form deleted VMs.
                # So remove all task related to target record.
                ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
                for change in changes_list:
                    for ro_task in ro_tasks:
                        for task in ro_task["tasks"]:
                            if task["target_record"] == change["target_record"]:
                                self.db.del_one(
                                    "ro_tasks",
                                    q_filter={
                                        "_id": ro_task["_id"],
                                        "modified_at": ro_task["modified_at"],
                                    },
                                    fail_on_empty=False,
                                )

                step = "Updating database, Appending tasks to ro_tasks"
                self.upload_recreate_tasks(
                    db_new_tasks=db_new_tasks,
                    now=now,
                )

            self.logger.debug(
                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
            )

            return (
                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
                action_id,
                True,
            )
        except Exception as e:
            if isinstance(e, (DbException, NsException)):
                self.logger.error(
                    logging_text + "Exit Exception while '{}': {}".format(step, e)
                )
            else:
                e = traceback_format_exc()
                self.logger.critical(
                    logging_text + "Exit Exception while '{}': {}".format(step, e),
                    exc_info=True,
                )

            raise NsException(e)

    def deploy(self, session, indata, version, nsr_id, *args, **kwargs):
        self.logger.debug("ns.deploy nsr_id={} indata={}".format(nsr_id, indata))
        validate_input(indata, deploy_schema)
        action_id = indata.get("action_id", str(uuid4()))
        task_index = 0
        # get current deployment
        db_nsr_update = {}  # update operation on nsrs
        db_vnfrs_update = {}
        db_vnfrs = {}  # vnf's info indexed by _id
        step = ""
        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
        self.logger.debug(logging_text + "Enter")

        try:
            step = "Getting ns and vnfr record from db"
            db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
            self.logger.debug("ns.deploy: db_nsr={}".format(db_nsr))
            db_new_tasks = []
            tasks_by_target_record_id = {}
            # read from db: vnf's of this ns
            step = "Getting vnfrs from db"
            db_vnfrs_list = self.db.get_list("vnfrs", {"nsr-id-ref": nsr_id})

            if not db_vnfrs_list:
                raise NsException("Cannot obtain associated VNF for ns")

            for vnfr in db_vnfrs_list:
                db_vnfrs[vnfr["_id"]] = vnfr
                db_vnfrs_update[vnfr["_id"]] = {}
            self.logger.debug("ns.deploy db_vnfrs={}".format(db_vnfrs))

            now = time()
            db_ro_nsr = self.db.get_one("ro_nsrs", {"_id": nsr_id}, fail_on_empty=False)

            if not db_ro_nsr:
                db_ro_nsr = self._create_db_ro_nsrs(nsr_id, now)

            # check that action_id is not in the list of actions. Suffixed with :index
            if action_id in db_ro_nsr["actions"]:
                index = 1

                while True:
                    new_action_id = "{}:{}".format(action_id, index)

                    if new_action_id not in db_ro_nsr["actions"]:
                        action_id = new_action_id
                        self.logger.debug(
                            logging_text
                            + "Changing action_id in use to {}".format(action_id)
                        )
                        break

                    index += 1

            def _process_action(indata):
                nonlocal db_new_tasks
                nonlocal action_id
                nonlocal nsr_id
                nonlocal task_index
                nonlocal db_vnfrs
                nonlocal db_ro_nsr

                if indata["action"]["action"] == "inject_ssh_key":
                    key = indata["action"].get("key")
                    user = indata["action"].get("user")
                    password = indata["action"].get("password")

                    for vnf in indata.get("vnf", ()):
                        if vnf["_id"] not in db_vnfrs:
                            raise NsException("Invalid vnf={}".format(vnf["_id"]))

                        db_vnfr = db_vnfrs[vnf["_id"]]

                        for target_vdu in vnf.get("vdur", ()):
                            vdu_index, vdur = next(
                                (
                                    i_v
                                    for i_v in enumerate(db_vnfr["vdur"])
                                    if i_v[1]["id"] == target_vdu["id"]
                                ),
                                (None, None),
                            )

                            if not vdur:
                                raise NsException(
                                    "Invalid vdu vnf={}.{}".format(
                                        vnf["_id"], target_vdu["id"]
                                    )
                                )

                            target_vim, vim_info = next(
                                k_v for k_v in vdur["vim_info"].items()
                            )
                            self._assign_vim(target_vim)
                            target_record = "vnfrs:{}:vdur.{}.ssh_keys".format(
                                vnf["_id"], vdu_index
                            )
                            extra_dict = {
                                "depends_on": [
                                    "vnfrs:{}:vdur.{}".format(vnf["_id"], vdur["id"])
                                ],
                                "params": {
                                    "ip_address": vdur.get("ip-address"),
                                    "user": user,
                                    "key": key,
                                    "password": password,
                                    "private_key": db_ro_nsr["private_key"],
                                    "salt": db_ro_nsr["_id"],
                                    "schema_version": db_ro_nsr["_admin"][
                                        "schema_version"
                                    ],
                                },
                            }

                            deployment_info = {
                                "action_id": action_id,
                                "nsr_id": nsr_id,
                                "task_index": task_index,
                            }

                            task = Ns._create_task(
                                deployment_info=deployment_info,
                                target_id=target_vim,
                                item="vdu",
                                action="EXEC",
                                target_record=target_record,
                                target_record_id=None,
                                extra_dict=extra_dict,
                            )

                            task_index = deployment_info.get("task_index")

                            db_new_tasks.append(task)

            with self.write_lock:
                if indata.get("action"):
                    _process_action(indata)
                else:
                    # compute network differences
                    # NS
                    step = "process NS elements"
                    changes_list = self.calculate_all_differences_to_deploy(
                        indata=indata,
                        nsr_id=nsr_id,
                        db_nsr=db_nsr,
                        db_vnfrs=db_vnfrs,
                        db_ro_nsr=db_ro_nsr,
                        db_nsr_update=db_nsr_update,
                        db_vnfrs_update=db_vnfrs_update,
                        action_id=action_id,
                        tasks_by_target_record_id=tasks_by_target_record_id,
                    )
                    self.define_all_tasks(
                        changes_list=changes_list,
                        db_new_tasks=db_new_tasks,
                        tasks_by_target_record_id=tasks_by_target_record_id,
                    )

                step = "Updating database, Appending tasks to ro_tasks"
                self.upload_all_tasks(
                    db_new_tasks=db_new_tasks,
                    now=now,
                )

                step = "Updating database, nsrs"
                if db_nsr_update:
                    self.db.set_one("nsrs", {"_id": nsr_id}, db_nsr_update)

                for vnfr_id, db_vnfr_update in db_vnfrs_update.items():
                    if db_vnfr_update:
                        step = "Updating database, vnfrs={}".format(vnfr_id)
                        self.db.set_one("vnfrs", {"_id": vnfr_id}, db_vnfr_update)

            self.logger.debug(
                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
            )

            return (
                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
                action_id,
                True,
            )
        except Exception as e:
            if isinstance(e, (DbException, NsException)):
                self.logger.error(
                    logging_text + "Exit Exception while '{}': {}".format(step, e)
                )
            else:
                e = traceback_format_exc()
                self.logger.critical(
                    logging_text + "Exit Exception while '{}': {}".format(step, e),
                    exc_info=True,
                )

            raise NsException(e)

    def delete(self, session, indata, version, nsr_id, *args, **kwargs):
        self.logger.debug("ns.delete version={} nsr_id={}".format(version, nsr_id))
        # self.db.del_list({"_id": ro_task["_id"], "tasks.nsr_id.ne": nsr_id})

        with self.write_lock:
            try:
                NsWorker.delete_db_tasks(self.db, nsr_id, None)
            except NsWorkerException as e:
                raise NsException(e)

        return None, None, True

    def status(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
        self.logger.debug(
            "ns.status version={} nsr_id={}, action_id={} indata={}".format(
                version, nsr_id, action_id, indata
            )
        )
        task_list = []
        done = 0
        total = 0
        ro_tasks = self.db.get_list("ro_tasks", {"tasks.action_id": action_id})
        global_status = "DONE"
        details = []

        for ro_task in ro_tasks:
            for task in ro_task["tasks"]:
                if task and task["action_id"] == action_id:
                    task_list.append(task)
                    total += 1

                    if task["status"] == "FAILED":
                        global_status = "FAILED"
                        error_text = "Error at {} {}: {}".format(
                            task["action"].lower(),
                            task["item"],
                            ro_task["vim_info"].get("vim_message") or "unknown",
                        )
                        details.append(error_text)
                    elif task["status"] in ("SCHEDULED", "BUILD"):
                        if global_status != "FAILED":
                            global_status = "BUILD"
                    else:
                        done += 1

        return_data = {
            "status": global_status,
            "details": ". ".join(details)
            if details
            else "progress {}/{}".format(done, total),
            "nsr_id": nsr_id,
            "action_id": action_id,
            "tasks": task_list,
        }

        return return_data, None, True

    def recreate_status(
        self, session, indata, version, nsr_id, action_id, *args, **kwargs
    ):
        return self.status(session, indata, version, nsr_id, action_id, *args, **kwargs)

    def cancel(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
        print(
            "ns.cancel session={} indata={} version={} nsr_id={}, action_id={}".format(
                session, indata, version, nsr_id, action_id
            )
        )

        return None, None, True

    def rebuild_start_stop_task(
        self,
        vdu_id,
        vnf_id,
        vdu_index,
        action_id,
        nsr_id,
        task_index,
        target_vim,
        extra_dict,
    ):
        self._assign_vim(target_vim)
        target_record = "vnfrs:{}:vdur.{}.vim_info.{}".format(
            vnf_id, vdu_index, target_vim
        )
        target_record_id = "vnfrs:{}:vdur.{}".format(vnf_id, vdu_id)
        deployment_info = {
            "action_id": action_id,
            "nsr_id": nsr_id,
            "task_index": task_index,
        }

        task = Ns._create_task(
            deployment_info=deployment_info,
            target_id=target_vim,
            item="update",
            action="EXEC",
            target_record=target_record,
            target_record_id=target_record_id,
            extra_dict=extra_dict,
        )
        return task

    def rebuild_start_stop(
        self, session, action_dict, version, nsr_id, *args, **kwargs
    ):
        task_index = 0
        extra_dict = {}
        now = time()
        action_id = action_dict.get("action_id", str(uuid4()))
        step = ""
        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
        self.logger.debug(logging_text + "Enter")

        action = list(action_dict.keys())[0]
        task_dict = action_dict.get(action)
        vim_vm_id = action_dict.get(action).get("vim_vm_id")

        if action_dict.get("stop"):
            action = "shutoff"
        db_new_tasks = []
        try:
            step = "lock the operation & do task creation"
            with self.write_lock:
                extra_dict["params"] = {
                    "vim_vm_id": vim_vm_id,
                    "action": action,
                }
                task = self.rebuild_start_stop_task(
                    task_dict["vdu_id"],
                    task_dict["vnf_id"],
                    task_dict["vdu_index"],
                    action_id,
                    nsr_id,
                    task_index,
                    task_dict["target_vim"],
                    extra_dict,
                )
                db_new_tasks.append(task)
                step = "upload Task to db"
                self.upload_all_tasks(
                    db_new_tasks=db_new_tasks,
                    now=now,
                )
                self.logger.debug(
                    logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
                )
                return (
                    {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
                    action_id,
                    True,
                )
        except Exception as e:
            if isinstance(e, (DbException, NsException)):
                self.logger.error(
                    logging_text + "Exit Exception while '{}': {}".format(step, e)
                )
            else:
                e = traceback_format_exc()
                self.logger.critical(
                    logging_text + "Exit Exception while '{}': {}".format(step, e),
                    exc_info=True,
                )
            raise NsException(e)

    def get_deploy(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
        nsrs = self.db.get_list("nsrs", {})
        return_data = []

        for ns in nsrs:
            return_data.append({"_id": ns["_id"], "name": ns["name"]})

        return return_data, None, True

    def get_actions(self, session, indata, version, nsr_id, action_id, *args, **kwargs):
        ro_tasks = self.db.get_list("ro_tasks", {"tasks.nsr_id": nsr_id})
        return_data = []

        for ro_task in ro_tasks:
            for task in ro_task["tasks"]:
                if task["action_id"] not in return_data:
                    return_data.append(task["action_id"])

        return return_data, None, True

    def migrate_task(
        self, vdu, vnf, vdu_index, action_id, nsr_id, task_index, extra_dict
    ):
        target_vim, vim_info = next(k_v for k_v in vdu["vim_info"].items())
        self._assign_vim(target_vim)
        target_record = "vnfrs:{}:vdur.{}.vim_info.{}".format(
            vnf["_id"], vdu_index, target_vim
        )
        target_record_id = "vnfrs:{}:vdur.{}".format(vnf["_id"], vdu["id"])
        deployment_info = {
            "action_id": action_id,
            "nsr_id": nsr_id,
            "task_index": task_index,
        }

        task = Ns._create_task(
            deployment_info=deployment_info,
            target_id=target_vim,
            item="migrate",
            action="EXEC",
            target_record=target_record,
            target_record_id=target_record_id,
            extra_dict=extra_dict,
        )

        return task

    def migrate(self, session, indata, version, nsr_id, *args, **kwargs):
        task_index = 0
        extra_dict = {}
        now = time()
        action_id = indata.get("action_id", str(uuid4()))
        step = ""
        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
        self.logger.debug(logging_text + "Enter")
        try:
            vnf_instance_id = indata["vnfInstanceId"]
            step = "Getting vnfrs from db"
            db_vnfr = self.db.get_one("vnfrs", {"_id": vnf_instance_id})
            vdu = indata.get("vdu")
            migrateToHost = indata.get("migrateToHost")
            db_new_tasks = []

            with self.write_lock:
                if vdu is not None:
                    vdu_id = indata["vdu"]["vduId"]
                    vdu_count_index = indata["vdu"].get("vduCountIndex", 0)
                    for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
                        if (
                            vdu["vdu-id-ref"] == vdu_id
                            and vdu["count-index"] == vdu_count_index
                        ):
                            extra_dict["params"] = {
                                "vim_vm_id": vdu["vim-id"],
                                "migrate_host": migrateToHost,
                                "vdu_vim_info": vdu["vim_info"],
                            }
                            step = "Creating migration task for vdu:{}".format(vdu)
                            task = self.migrate_task(
                                vdu,
                                db_vnfr,
                                vdu_index,
                                action_id,
                                nsr_id,
                                task_index,
                                extra_dict,
                            )
                            db_new_tasks.append(task)
                            task_index += 1
                            break
                else:
                    for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
                        extra_dict["params"] = {
                            "vim_vm_id": vdu["vim-id"],
                            "migrate_host": migrateToHost,
                            "vdu_vim_info": vdu["vim_info"],
                        }
                        step = "Creating migration task for vdu:{}".format(vdu)
                        task = self.migrate_task(
                            vdu,
                            db_vnfr,
                            vdu_index,
                            action_id,
                            nsr_id,
                            task_index,
                            extra_dict,
                        )
                        db_new_tasks.append(task)
                        task_index += 1

                self.upload_all_tasks(
                    db_new_tasks=db_new_tasks,
                    now=now,
                )

            self.logger.debug(
                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
            )
            return (
                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
                action_id,
                True,
            )
        except Exception as e:
            if isinstance(e, (DbException, NsException)):
                self.logger.error(
                    logging_text + "Exit Exception while '{}': {}".format(step, e)
                )
            else:
                e = traceback_format_exc()
                self.logger.critical(
                    logging_text + "Exit Exception while '{}': {}".format(step, e),
                    exc_info=True,
                )
            raise NsException(e)

    def verticalscale_task(
        self, vdu, vnf, vdu_index, action_id, nsr_id, task_index, extra_dict
    ):
        target_vim, vim_info = next(k_v for k_v in vdu["vim_info"].items())
        self._assign_vim(target_vim)
        ns_preffix = "nsrs:{}".format(nsr_id)
        flavor_text = ns_preffix + ":flavor." + vdu["ns-flavor-id"]
        extra_dict["depends_on"] = [flavor_text]
        extra_dict["params"].update({"flavor_id": "TASK-" + flavor_text})
        target_record = "vnfrs:{}:vdur.{}.vim_info.{}".format(
            vnf["_id"], vdu_index, target_vim
        )
        target_record_id = "vnfrs:{}:vdur.{}".format(vnf["_id"], vdu["id"])
        deployment_info = {
            "action_id": action_id,
            "nsr_id": nsr_id,
            "task_index": task_index,
        }

        task = Ns._create_task(
            deployment_info=deployment_info,
            target_id=target_vim,
            item="verticalscale",
            action="EXEC",
            target_record=target_record,
            target_record_id=target_record_id,
            extra_dict=extra_dict,
        )
        return task

    def verticalscale_flavor_task(
        self, vdu, vnf, vdu_index, action_id, nsr_id, task_index, extra_dict
    ):
        target_vim, vim_info = next(k_v for k_v in vdu["vim_info"].items())
        self._assign_vim(target_vim)
        db_nsr = self.db.get_one("nsrs", {"_id": nsr_id})
        target_record = "nsrs:{}:flavor.{}.vim_info.{}".format(
            nsr_id, len(db_nsr["flavor"]) - 1, target_vim
        )
        target_record_id = "nsrs:{}:flavor.{}".format(nsr_id, len(db_nsr["flavor"]) - 1)
        deployment_info = {
            "action_id": action_id,
            "nsr_id": nsr_id,
            "task_index": task_index,
        }
        task = Ns._create_task(
            deployment_info=deployment_info,
            target_id=target_vim,
            item="flavor",
            action="CREATE",
            target_record=target_record,
            target_record_id=target_record_id,
            extra_dict=extra_dict,
        )
        return task

    def verticalscale(self, session, indata, version, nsr_id, *args, **kwargs):
        task_index = 0
        extra_dict = {}
        flavor_extra_dict = {}
        now = time()
        action_id = indata.get("action_id", str(uuid4()))
        step = ""
        logging_text = "Task deploy nsr_id={} action_id={} ".format(nsr_id, action_id)
        self.logger.debug(logging_text + "Enter")
        try:
            VnfFlavorData = indata.get("changeVnfFlavorData")
            vnf_instance_id = VnfFlavorData["vnfInstanceId"]
            step = "Getting vnfrs from db"
            db_vnfr = self.db.get_one("vnfrs", {"_id": vnf_instance_id})
            vduid = VnfFlavorData["additionalParams"]["vduid"]
            vduCountIndex = VnfFlavorData["additionalParams"]["vduCountIndex"]
            virtualMemory = VnfFlavorData["additionalParams"]["virtualMemory"]
            numVirtualCpu = VnfFlavorData["additionalParams"]["numVirtualCpu"]
            sizeOfStorage = VnfFlavorData["additionalParams"]["sizeOfStorage"]
            flavor_dict = {
                "name": vduid + "-flv",
                "ram": virtualMemory,
                "vcpus": numVirtualCpu,
                "disk": sizeOfStorage,
            }
            flavor_data = {
                "ram": virtualMemory,
                "vcpus": numVirtualCpu,
                "disk": sizeOfStorage,
            }
            flavor_extra_dict["find_params"] = {"flavor_data": flavor_data}
            flavor_extra_dict["params"] = {"flavor_data": flavor_dict}
            db_new_tasks = []
            step = "Creating Tasks for vertical scaling"
            with self.write_lock:
                for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
                    if (
                        vdu["vdu-id-ref"] == vduid
                        and vdu["count-index"] == vduCountIndex
                    ):
                        extra_dict["params"] = {
                            "vim_vm_id": vdu["vim-id"],
                            "flavor_dict": flavor_dict,
                            "vdu-id-ref": vdu["vdu-id-ref"],
                            "count-index": vdu["count-index"],
                            "vnf_instance_id": vnf_instance_id,
                        }
                        task = self.verticalscale_flavor_task(
                            vdu,
                            db_vnfr,
                            vdu_index,
                            action_id,
                            nsr_id,
                            task_index,
                            flavor_extra_dict,
                        )
                        db_new_tasks.append(task)
                        task_index += 1
                        task = self.verticalscale_task(
                            vdu,
                            db_vnfr,
                            vdu_index,
                            action_id,
                            nsr_id,
                            task_index,
                            extra_dict,
                        )
                        db_new_tasks.append(task)
                        task_index += 1
                        break
                self.upload_all_tasks(
                    db_new_tasks=db_new_tasks,
                    now=now,
                )
            self.logger.debug(
                logging_text + "Exit. Created {} tasks".format(len(db_new_tasks))
            )
            return (
                {"status": "ok", "nsr_id": nsr_id, "action_id": action_id},
                action_id,
                True,
            )
        except Exception as e:
            if isinstance(e, (DbException, NsException)):
                self.logger.error(
                    logging_text + "Exit Exception while '{}': {}".format(step, e)
                )
            else:
                e = traceback_format_exc()
                self.logger.critical(
                    logging_text + "Exit Exception while '{}': {}".format(step, e),
                    exc_info=True,
                )
            raise NsException(e)