fix error ns_instances_content when not instantiated, rollback problems and pdu usage...
[osm/NBI.git] / osm_nbi / engine.py
index 53bf219..38cc08e 100644 (file)
@@ -1,54 +1,61 @@
 # -*- coding: utf-8 -*-
 
-from osm_common import dbmongo
-from osm_common import dbmemory
-from osm_common import fslocal
-from osm_common import msglocal
-from osm_common import msgkafka
-import tarfile
-import yaml
-import json
+# 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.
+
 import logging
-from uuid import uuid4
-from hashlib import sha256, md5
-from osm_common.dbbase import DbException, deep_update
+from osm_common import dbmongo, dbmemory, fslocal, msglocal, msgkafka, version as common_version
+from osm_common.dbbase import DbException
 from osm_common.fsbase import FsException
 from osm_common.msgbase import MsgException
 from http import HTTPStatus
-from time import time
-from copy import copy
-from validation import validate_input, ValidationError
+from base_topic import EngineException, versiontuple
+from admin_topics import UserTopic, ProjectTopic, VimAccountTopic, WimAccountTopic, SdnTopic
+from descriptor_topics import VnfdTopic, NsdTopic, PduTopic, NstTopic
+from instance_topics import NsrTopic, VnfrTopic, NsLcmOpTopic, NsiTopic, NsiLcmOpTopic
+from base64 import b64encode
+from os import urandom
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"
-
-
-class EngineException(Exception):
-
-    def __init__(self, message, http_code=HTTPStatus.BAD_REQUEST):
-        self.http_code = http_code
-        Exception.__init__(self, message)
-
-
-def get_iterable(input):
-    """
-    Returns an iterable, in case input is None it just returns an empty tuple
-    :param input:
-    :return: iterable
-    """
-    if input is None:
-        return ()
-    return input
+min_common_version = "0.1.8"
 
 
 class Engine(object):
+    map_from_topic_to_class = {
+        "vnfds": VnfdTopic,
+        "nsds": NsdTopic,
+        "nsts": NstTopic,
+        "pdus": PduTopic,
+        "nsrs": NsrTopic,
+        "vnfrs": VnfrTopic,
+        "nslcmops": NsLcmOpTopic,
+        "vim_accounts": VimAccountTopic,
+        "wim_accounts": WimAccountTopic,
+        "sdns": SdnTopic,
+        "users": UserTopic,
+        "projects": ProjectTopic,
+        "nsis": NsiTopic,
+        "nsilcmops": NsiLcmOpTopic
+        # [NEW_TOPIC]: add an entry here
+    }
 
     def __init__(self):
-        self.tokens = {}
         self.db = None
         self.fs = None
         self.msg = None
         self.config = None
         self.logger = logging.getLogger("nbi.engine")
+        self.map_topic = {}
 
     def start(self, config):
         """
@@ -57,6 +64,11 @@ class Engine(object):
         :return: None
         """
         self.config = config
+        # check right version of common
+        if versiontuple(common_version) < versiontuple(min_common_version):
+            raise EngineException("Not compatible osm/common version '{}'. Needed '{}' or higher".format(
+                common_version, min_common_version))
+
         try:
             if not self.db:
                 if config["database"]["driver"] == "mongo":
@@ -85,6 +97,10 @@ class Engine(object):
                 else:
                     raise EngineException("Invalid configuration param '{}' at '[message]':'driver'".format(
                         config["storage"]["driver"]))
+
+            # create one class per topic
+            for topic, topic_class in self.map_from_topic_to_class.items():
+                self.map_topic[topic] = topic_class(self.db, self.fs, self.msg)
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
@@ -99,905 +115,116 @@ class Engine(object):
         except (DbException, FsException, MsgException) as e:
             raise EngineException(str(e), http_code=e.http_code)
 
-    @staticmethod
-    def _remove_envelop(item, indata=None):
-        """
-        Obtain the useful data removing the envelop. It goes throw the vnfd or nsd catalog and returns the
-        vnfd or nsd content
-        :param item: can be vnfds, nsds, users, projects, userDefinedData (initial content of a vnfds, nsds
-        :param indata: Content to be inspected
-        :return: the useful part of indata
-        """
-        clean_indata = indata
-        if not indata:
-            return {}
-        if item == "vnfds":
-            if clean_indata.get('vnfd:vnfd-catalog'):
-                clean_indata = clean_indata['vnfd:vnfd-catalog']
-            elif clean_indata.get('vnfd-catalog'):
-                clean_indata = clean_indata['vnfd-catalog']
-            if clean_indata.get('vnfd'):
-                if not isinstance(clean_indata['vnfd'], list) or len(clean_indata['vnfd']) != 1:
-                    raise EngineException("'vnfd' must be a list only one element")
-                clean_indata = clean_indata['vnfd'][0]
-        elif item == "nsds":
-            if clean_indata.get('nsd:nsd-catalog'):
-                clean_indata = clean_indata['nsd:nsd-catalog']
-            elif clean_indata.get('nsd-catalog'):
-                clean_indata = clean_indata['nsd-catalog']
-            if clean_indata.get('nsd'):
-                if not isinstance(clean_indata['nsd'], list) or len(clean_indata['nsd']) != 1:
-                    raise EngineException("'nsd' must be a list only one element")
-                clean_indata = clean_indata['nsd'][0]
-        elif item == "userDefinedData":
-            if "userDefinedData" in indata:
-                clean_indata = clean_indata['userDefinedData']
-        return clean_indata
-
-    def _check_project_dependencies(self, project_id):
-        """
-        Check if a project can be deleted
-        :param session:
-        :param _id:
-        :return:
-        """
-        # TODO Is it needed to check descriptors _admin.project_read/project_write??
-        _filter = {"projects": project_id}
-        if self.db.get_list("users", _filter):
-            raise EngineException("There are users that uses this project", http_code=HTTPStatus.CONFLICT)
-
-    def _check_dependencies_on_descriptor(self, session, item, descriptor_id, _id):
-        """
-        Check that the descriptor to be deleded is not a dependency of others
-        :param session: client session information
-        :param item: can be vnfds, nsds
-        :param descriptor_id: id (provided by client) of descriptor to be deleted
-        :param _id: internal id of descriptor to be deleted
-        :return: None or raises exception
-        """
-        if item == "vnfds":
-            _filter = {"constituent-vnfd.ANYINDEX.vnfd-id-ref": descriptor_id}
-            if self.get_item_list(session, "nsds", _filter):
-                raise EngineException("There are nsd that depends on this VNFD", http_code=HTTPStatus.CONFLICT)
-            if self.get_item_list(session, "vnfrs", {"vnfd-id": _id}):
-                raise EngineException("There are vnfr that depends on this VNFD", http_code=HTTPStatus.CONFLICT)
-        elif item == "nsds":
-            _filter = {"nsdId": _id}
-            if self.get_item_list(session, "nsrs", _filter):
-                raise EngineException("There are nsr that depends on this NSD", http_code=HTTPStatus.CONFLICT)
-
-    def _check_descriptor_dependencies(self, session, item, descriptor):
-        """
-        Check that the dependent descriptors exist on a new descriptor or edition
-        :param session: client session information
-        :param item: can be nsds, nsrs
-        :param descriptor: descriptor to be inserted or edit
-        :return: None or raises exception
-        """
-        if item == "nsds":
-            if not descriptor.get("constituent-vnfd"):
-                return
-            for vnf in descriptor["constituent-vnfd"]:
-                vnfd_id = vnf["vnfd-id-ref"]
-                if not self.get_item_list(session, "vnfds", {"id": vnfd_id}):
-                    raise EngineException("Descriptor error at 'constituent-vnfd':'vnfd-id-ref'='{}' references a non "
-                                          "existing vnfd".format(vnfd_id), http_code=HTTPStatus.CONFLICT)
-        elif item == "nsrs":
-            if not descriptor.get("nsdId"):
-                return
-            nsd_id = descriptor["nsdId"]
-            if not self.get_item_list(session, "nsds", {"id": nsd_id}):
-                raise EngineException("Descriptor error at nsdId='{}' references a non exist nsd".format(nsd_id),
-                                      http_code=HTTPStatus.CONFLICT)
-
-    def _check_edition(self, session, item, indata, id, force=False):
-        if item == "users":
-            if indata.get("projects"):
-                if not session["admin"]:
-                    raise EngineException("Needed admin privileges to edit user projects", HTTPStatus.UNAUTHORIZED)
-            if indata.get("password"):
-                # regenerate salt and encrypt password
-                salt = uuid4().hex
-                indata["_admin"] = {"salt": salt}
-                indata["password"] = sha256(indata["password"].encode('utf-8') + salt.encode('utf-8')).hexdigest()
-
-    def _validate_new_data(self, session, item, indata, id=None, force=False):
-        if item == "users":
-            # check username not exists
-            if not id and self.db.get_one(item, {"username": indata.get("username")}, fail_on_empty=False,
-                                          fail_on_more=False):
-                raise EngineException("username '{}' exists".format(indata["username"]), HTTPStatus.CONFLICT)
-            # check projects
-            if not force:
-                for p in indata["projects"]:
-                    if p == "admin":
-                        continue
-                    if not self.db.get_one("projects", {"_id": p}, fail_on_empty=False, fail_on_more=False):
-                        raise EngineException("project '{}' does not exists".format(p), HTTPStatus.CONFLICT)
-        elif item == "projects":
-            if not indata.get("name"):
-                raise EngineException("missing 'name'")
-            # check name not exists
-            if not id and self.db.get_one(item, {"name": indata.get("name")}, fail_on_empty=False, fail_on_more=False):
-                raise EngineException("name '{}' exists".format(indata["name"]), HTTPStatus.CONFLICT)
-        elif item in ("vnfds", "nsds"):
-            filter = {"id": indata["id"]}
-            if id:
-                filter["_id.neq"] = id
-            # TODO add admin to filter, validate rights
-            self._add_read_filter(session, item, filter)
-            if self.db.get_one(item, filter, fail_on_empty=False):
-                raise EngineException("{} with id '{}' already exists for this tenant".format(item[:-1], indata["id"]),
-                                      HTTPStatus.CONFLICT)
-            # TODO validate with pyangbind. Load and dumps to convert data types
-            if item == "nsds":
-                # transform constituent-vnfd:member-vnf-index to string
-                if indata.get("constituent-vnfd"):
-                    for constituent_vnfd in indata["constituent-vnfd"]:
-                        if "member-vnf-index" in constituent_vnfd:
-                            constituent_vnfd["member-vnf-index"] = str(constituent_vnfd["member-vnf-index"])
-
-            if item == "nsds" and not force:
-                self._check_descriptor_dependencies(session, "nsds", indata)
-        elif item == "userDefinedData":
-            # TODO validate userDefinedData is a keypair values
-            pass
-
-        elif item == "nsrs":
-            pass
-        elif item == "vim_accounts" or item == "sdns":
-            filter = {"name": indata.get("name")}
-            if id:
-                filter["_id.neq"] = id
-            if self.db.get_one(item, filter, fail_on_empty=False, fail_on_more=False):
-                raise EngineException("name '{}' already exists for {}".format(indata["name"], item),
-                                      HTTPStatus.CONFLICT)
-
-    def _check_ns_operation(self, session, nsr, operation, indata):
-        """
-        Check that user has enter right parameters for the operation
-        :param session:
-        :param operation: it can be: instantiate, terminate, action, TODO: update, heal
-        :param indata: descriptor with the parameters of the operation
-        :return: None
-        """
-        vnfds = {}
-        vim_accounts = []
-        nsd = nsr["nsd"]
-
-        def check_valid_vnf_member_index(member_vnf_index):
-            for vnf in nsd["constituent-vnfd"]:
-                if member_vnf_index == vnf["member-vnf-index"]:
-                    vnfd_id = vnf["vnfd-id-ref"]
-                    if vnfd_id not in vnfds:
-                        vnfds[vnfd_id] = self.db.get_one("vnfds", {"id": vnfd_id})
-                    return vnfds[vnfd_id]
-            else:
-                raise EngineException("Invalid parameter member_vnf_index='{}' is not one of the "
-                                      "nsd:constituent-vnfd".format(member_vnf_index))
-
-        def check_valid_vim_account(vim_account):
-            if vim_account in vim_accounts:
-                return
-            try:
-                self.db.get_one("vim_accounts", {"_id": vim_account})
-            except Exception:
-                raise EngineException("Invalid vimAccountId='{}' not present".format(vim_account))
-            vim_accounts.append(vim_account)
-
-        if operation == "action":
-            # check vnf_member_index
-            if indata.get("vnf_member_index"):
-                indata["member_vnf_index"] = indata.pop("vnf_member_index")    # for backward compatibility
-            if not indata.get("member_vnf_index"):
-                raise EngineException("Missing 'member_vnf_index' parameter")
-            vnfd = check_valid_vnf_member_index(indata["member_vnf_index"])
-            # check primitive
-            for config_primitive in get_iterable(vnfd.get("vnf-configuration", {}).get("config-primitive")):
-                if indata["primitive"] == config_primitive["name"]:
-                    # check needed primitive_params are provided
-                    if indata.get("primitive_params"):
-                        in_primitive_params_copy = copy(indata["primitive_params"])
-                    else:
-                        in_primitive_params_copy = {}
-                    for paramd in get_iterable(config_primitive.get("parameter")):
-                        if paramd["name"] in in_primitive_params_copy:
-                            del in_primitive_params_copy[paramd["name"]]
-                        elif not paramd.get("default-value"):
-                            raise EngineException("Needed parameter {} not provided for primitive '{}'".format(
-                                paramd["name"], indata["primitive"]))
-                    # check no extra primitive params are provided
-                    if in_primitive_params_copy:
-                        raise EngineException("parameter/s '{}' not present at vnfd for primitive '{}'".format(
-                            list(in_primitive_params_copy.keys()), indata["primitive"]))
-                    break
-            else:
-                raise EngineException("Invalid primitive '{}' is not present at vnfd".format(indata["primitive"]))
-        if operation == "scale":
-            vnfd = check_valid_vnf_member_index(indata["scaleVnfData"]["scaleByStepData"]["member-vnf-index"])
-            for scaling_group in get_iterable(vnfd.get("scaling-group-descriptor")):
-                if indata["scaleVnfData"]["scaleByStepData"]["scaling-group-descriptor"] == scaling_group["name"]:
-                    break
-            else:
-                raise EngineException("Invalid scaleVnfData:scaleByStepData:scaling-group-descriptor '{}' is not "
-                                      "present at vnfd:scaling-group-descriptor".format(
-                                          indata["scaleVnfData"]["scaleByStepData"]["scaling-group-descriptor"]))
-        if operation == "instantiate":
-            # check vim_account
-            check_valid_vim_account(indata["vimAccountId"])
-            for in_vnf in get_iterable(indata.get("vnf")):
-                vnfd = check_valid_vnf_member_index(in_vnf["member-vnf-index"])
-                if in_vnf.get("vimAccountId"):
-                    check_valid_vim_account(in_vnf["vimAccountId"])
-                for in_vdu in get_iterable(in_vnf.get("vdu")):
-                    for vdud in get_iterable(vnfd.get("vdu")):
-                        if vdud["id"] == in_vdu["id"]:
-                            for volume in get_iterable(in_vdu.get("volume")):
-                                for volumed in get_iterable(vdud.get("volumes")):
-                                    if volumed["name"] == volume["name"]:
-                                        break
-                                else:
-                                    raise EngineException("Invalid parameter vnf[member-vnf-index='{}']:vdu[id='{}']:"
-                                                          "volume:name='{}' is not present at vnfd:vdu:volumes list".
-                                                          format(in_vnf["member-vnf-index"], in_vdu["id"],
-                                                                 volume["name"]))
-                            break
-                    else:
-                        raise EngineException("Invalid parameter vnf[member-vnf-index='{}']:vdu:id='{}' is not "
-                                              "present at vnfd".format(in_vnf["member-vnf-index"], in_vdu["id"]))
-
-                for in_internal_vld in get_iterable(in_vnf.get("internal-vld")):
-                    for internal_vldd in get_iterable(vnfd.get("internal-vld")):
-                        if in_internal_vld["name"] == internal_vldd["name"] or \
-                                in_internal_vld["name"] == internal_vldd["id"]:
-                            break
-                    else:
-                        raise EngineException("Invalid parameter vnf[member-vnf-index='{}']:internal-vld:name='{}'"
-                                              " is not present at vnfd '{}'".format(in_vnf["member-vnf-index"],
-                                                                                    in_internal_vld["name"],
-                                                                                    vnfd["id"]))
-            for in_vld in get_iterable(indata.get("vld")):
-                for vldd in get_iterable(nsd.get("vld")):
-                    if in_vld["name"] == vldd["name"] or in_vld["name"] == vldd["id"]:
-                        break
-                else:
-                    raise EngineException("Invalid parameter vld:name='{}' is not present at nsd:vld".format(
-                        in_vld["name"]))
-
-    def _format_new_data(self, session, item, indata):
-        now = time()
-        if "_admin" not in indata:
-            indata["_admin"] = {}
-        indata["_admin"]["created"] = now
-        indata["_admin"]["modified"] = now
-        if item == "users":
-            indata["_id"] = indata["username"]
-            salt = uuid4().hex
-            indata["_admin"]["salt"] = salt
-            indata["password"] = sha256(indata["password"].encode('utf-8') + salt.encode('utf-8')).hexdigest()
-        elif item == "projects":
-            indata["_id"] = indata["name"]
-        else:
-            if not indata.get("_id"):
-                indata["_id"] = str(uuid4())
-            if item in ("vnfds", "nsds", "nsrs", "vnfrs"):
-                if not indata["_admin"].get("projects_read"):
-                    indata["_admin"]["projects_read"] = [session["project_id"]]
-                if not indata["_admin"].get("projects_write"):
-                    indata["_admin"]["projects_write"] = [session["project_id"]]
-            if item in ("vnfds", "nsds"):
-                indata["_admin"]["onboardingState"] = "CREATED"
-                indata["_admin"]["operationalState"] = "DISABLED"
-                indata["_admin"]["usageSate"] = "NOT_IN_USE"
-            if item == "nsrs":
-                indata["_admin"]["nsState"] = "NOT_INSTANTIATED"
-            if item in ("vim_accounts", "sdns"):
-                indata["_admin"]["operationalState"] = "PROCESSING"
-
-    def upload_content(self, session, item, _id, indata, kwargs, headers):
-        """
-        Used for receiving content by chunks (with a transaction_id header and/or gzip file. It will store and extract)
-        :param session: session
-        :param item: can be nsds or vnfds
-        :param _id : the nsd,vnfd is already created, this is the id
-        :param indata: http body request
-        :param kwargs: user query string to override parameters. NOT USED
-        :param headers:  http request headers
-        :return: True package has is completely uploaded or False if partial content has been uplodaed.
-            Raise exception on error
-        """
-        # Check that _id exists and it is valid
-        current_desc = self.get_item(session, item, _id)
-
-        content_range_text = headers.get("Content-Range")
-        expected_md5 = headers.get("Content-File-MD5")
-        compressed = None
-        content_type = headers.get("Content-Type")
-        if content_type and "application/gzip" in content_type or "application/x-gzip" in content_type or \
-                "application/zip" in content_type:
-            compressed = "gzip"
-        filename = headers.get("Content-Filename")
-        if not filename:
-            filename = "package.tar.gz" if compressed else "package"
-        # TODO change to Content-Disposition filename https://tools.ietf.org/html/rfc6266
-        file_pkg = None
-        error_text = ""
-        try:
-            if content_range_text:
-                content_range = content_range_text.replace("-", " ").replace("/", " ").split()
-                if content_range[0] != "bytes":  # TODO check x<y not negative < total....
-                    raise IndexError()
-                start = int(content_range[1])
-                end = int(content_range[2]) + 1
-                total = int(content_range[3])
-            else:
-                start = 0
-
-            if start:
-                if not self.fs.file_exists(_id, 'dir'):
-                    raise EngineException("invalid Transaction-Id header", HTTPStatus.NOT_FOUND)
-            else:
-                self.fs.file_delete(_id, ignore_non_exist=True)
-                self.fs.mkdir(_id)
-
-            storage = self.fs.get_params()
-            storage["folder"] = _id
-
-            file_path = (_id, filename)
-            if self.fs.file_exists(file_path, 'file'):
-                file_size = self.fs.file_size(file_path)
-            else:
-                file_size = 0
-            if file_size != start:
-                raise EngineException("invalid Content-Range start sequence, expected '{}' but received '{}'".format(
-                    file_size, start), HTTPStatus.REQUESTED_RANGE_NOT_SATISFIABLE)
-            file_pkg = self.fs.file_open(file_path, 'a+b')
-            if isinstance(indata, dict):
-                indata_text = yaml.safe_dump(indata, indent=4, default_flow_style=False)
-                file_pkg.write(indata_text.encode(encoding="utf-8"))
-            else:
-                indata_len = 0
-                while True:
-                    indata_text = indata.read(4096)
-                    indata_len += len(indata_text)
-                    if not indata_text:
-                        break
-                    file_pkg.write(indata_text)
-            if content_range_text:
-                if indata_len != end-start:
-                    raise EngineException("Mismatch between Content-Range header {}-{} and body length of {}".format(
-                        start, end-1, indata_len), HTTPStatus.REQUESTED_RANGE_NOT_SATISFIABLE)
-                if end != total:
-                    # TODO update to UPLOADING
-                    return False
-
-            # PACKAGE UPLOADED
-            if expected_md5:
-                file_pkg.seek(0, 0)
-                file_md5 = md5()
-                chunk_data = file_pkg.read(1024)
-                while chunk_data:
-                    file_md5.update(chunk_data)
-                    chunk_data = file_pkg.read(1024)
-                if expected_md5 != file_md5.hexdigest():
-                    raise EngineException("Error, MD5 mismatch", HTTPStatus.CONFLICT)
-            file_pkg.seek(0, 0)
-            if compressed == "gzip":
-                tar = tarfile.open(mode='r', fileobj=file_pkg)
-                descriptor_file_name = None
-                for tarinfo in tar:
-                    tarname = tarinfo.name
-                    tarname_path = tarname.split("/")
-                    if not tarname_path[0] or ".." in tarname_path:  # if start with "/" means absolute path
-                        raise EngineException("Absolute path or '..' are not allowed for package descriptor tar.gz")
-                    if len(tarname_path) == 1 and not tarinfo.isdir():
-                        raise EngineException("All files must be inside a dir for package descriptor tar.gz")
-                    if tarname.endswith(".yaml") or tarname.endswith(".json") or tarname.endswith(".yml"):
-                        storage["pkg-dir"] = tarname_path[0]
-                        if len(tarname_path) == 2:
-                            if descriptor_file_name:
-                                raise EngineException(
-                                    "Found more than one descriptor file at package descriptor tar.gz")
-                            descriptor_file_name = tarname
-                if not descriptor_file_name:
-                    raise EngineException("Not found any descriptor file at package descriptor tar.gz")
-                storage["descriptor"] = descriptor_file_name
-                storage["zipfile"] = filename
-                self.fs.file_extract(tar, _id)
-                with self.fs.file_open((_id, descriptor_file_name), "r") as descriptor_file:
-                    content = descriptor_file.read()
-            else:
-                content = file_pkg.read()
-                storage["descriptor"] = descriptor_file_name = filename
-
-            if descriptor_file_name.endswith(".json"):
-                error_text = "Invalid json format "
-                indata = json.load(content)
-            else:
-                error_text = "Invalid yaml format "
-                indata = yaml.load(content)
-
-            current_desc["_admin"]["storage"] = storage
-            current_desc["_admin"]["onboardingState"] = "ONBOARDED"
-            current_desc["_admin"]["operationalState"] = "ENABLED"
-
-            self._edit_item(session, item, _id, current_desc, indata, kwargs)
-            # TODO if descriptor has changed because kwargs update content and remove cached zip
-            # TODO if zip is not present creates one
-            return True
-
-        except EngineException:
-            raise
-        except IndexError:
-            raise EngineException("invalid Content-Range header format. Expected 'bytes start-end/total'",
-                                  HTTPStatus.REQUESTED_RANGE_NOT_SATISFIABLE)
-        except IOError as e:
-            raise EngineException("invalid upload transaction sequence: '{}'".format(e), HTTPStatus.BAD_REQUEST)
-        except tarfile.ReadError as e:
-            raise EngineException("invalid file content {}".format(e), HTTPStatus.BAD_REQUEST)
-        except (ValueError, yaml.YAMLError) as e:
-            raise EngineException(error_text + str(e))
-        finally:
-            if file_pkg:
-                file_pkg.close()
-
-    def new_nsr(self, rollback, session, ns_request):
-        """
-        Creates a new nsr into database. It also creates needed vnfrs
-        :param rollback: list where this method appends created items at database in case a rollback may to be done
-        :param session: contains the used login username and working project
-        :param ns_request: params to be used for the nsr
-        :return: the _id of nsr descriptor stored at database
-        """
-        rollback_index = len(rollback)
-        step = ""
-        try:
-            # look for nsr
-            step = "getting nsd id='{}' from database".format(ns_request.get("nsdId"))
-            nsd = self.get_item(session, "nsds", ns_request["nsdId"])
-            nsr_id = str(uuid4())
-            now = time()
-            step = "filling nsr from input data"
-            nsr_descriptor = {
-                "name": ns_request["nsName"],
-                "name-ref": ns_request["nsName"],
-                "short-name": ns_request["nsName"],
-                "admin-status": "ENABLED",
-                "nsd": nsd,
-                "datacenter": ns_request["vimAccountId"],
-                "resource-orchestrator": "osmopenmano",
-                "description": ns_request.get("nsDescription", ""),
-                "constituent-vnfr-ref": [],
-
-                "operational-status": "init",    # typedef ns-operational-
-                "config-status": "init",         # typedef config-states
-                "detailed-status": "scheduled",
-
-                "orchestration-progress": {},
-                # {"networks": {"active": 0, "total": 0}, "vms": {"active": 0, "total": 0}},
-
-                "create-time": now,
-                "nsd-name-ref": nsd["name"],
-                "operational-events": [],   # "id", "timestamp", "description", "event",
-                "nsd-ref": nsd["id"],
-                "nsdId": nsd["_id"],
-                "instantiate_params": ns_request,
-                "ns-instance-config-ref": nsr_id,
-                "id": nsr_id,
-                "_id": nsr_id,
-                # "input-parameter": xpath, value,
-                "ssh-authorized-key": ns_request.get("key-pair-ref"),
-            }
-            ns_request["nsr_id"] = nsr_id
-
-            # Create VNFR
-            needed_vnfds = {}
-            for member_vnf in nsd["constituent-vnfd"]:
-                vnfd_id = member_vnf["vnfd-id-ref"]
-                step = "getting vnfd id='{}' constituent-vnfd='{}' from database".format(
-                    member_vnf["vnfd-id-ref"], member_vnf["member-vnf-index"])
-                if vnfd_id not in needed_vnfds:
-                    # Obtain vnfd
-                    vnf_filter = {"id": vnfd_id}
-                    self._add_read_filter(session, "vnfds", vnf_filter)
-                    vnfd = self.db.get_one("vnfds", vnf_filter)
-                    vnfd.pop("_admin")
-                    needed_vnfds[vnfd_id] = vnfd
-                else:
-                    vnfd = needed_vnfds[vnfd_id]
-                step = "filling vnfr  vnfd-id='{}' constituent-vnfd='{}'".format(
-                    member_vnf["vnfd-id-ref"], member_vnf["member-vnf-index"])
-                vnfr_id = str(uuid4())
-                vnfr_descriptor = {
-                    "id": vnfr_id,
-                    "_id": vnfr_id,
-                    "nsr-id-ref": nsr_id,
-                    "member-vnf-index-ref": member_vnf["member-vnf-index"],
-                    "created-time": now,
-                    # "vnfd": vnfd,        # at OSM model.but removed to avoid data duplication TODO: revise
-                    "vnfd-ref": vnfd_id,
-                    "vnfd-id": vnfd["_id"],    # not at OSM model, but useful
-                    "vim-account-id": None,
-                    "vdur": [],
-                    "connection-point": [],
-                    "ip-address": None,  # mgmt-interface filled by LCM
-                }
-                for cp in vnfd.get("connection-point", ()):
-                    vnf_cp = {
-                        "name": cp["name"],
-                        "connection-point-id": cp.get("id"),
-                        "id": cp.get("id"),
-                        # "ip-address", "mac-address" # filled by LCM
-                        # vim-id  # TODO it would be nice having a vim port id
-                    }
-                    vnfr_descriptor["connection-point"].append(vnf_cp)
-                for vdu in vnfd["vdu"]:
-                    vdur_id = str(uuid4())
-                    vdur = {
-                        "id": vdur_id,
-                        "vdu-id-ref": vdu["id"],
-                        # TODO      "name": ""     Name of the VDU in the VIM
-                        "ip-address": None,  # mgmt-interface filled by LCM
-                        # "vim-id", "flavor-id", "image-id", "management-ip" # filled by LCM
-                        "internal-connection-point": [],
-                        "interfaces": [],
-                    }
-                    # TODO volumes: name, volume-id
-                    for icp in vdu.get("internal-connection-point", ()):
-                        vdu_icp = {
-                            "id": icp["id"],
-                            "connection-point-id": icp["id"],
-                            "name": icp.get("name"),
-                            # "ip-address", "mac-address" # filled by LCM
-                            # vim-id  # TODO it would be nice having a vim port id
-                        }
-                        vdur["internal-connection-point"].append(vdu_icp)
-                    for iface in vdu.get("interface", ()):
-                        vdu_iface = {
-                            "name": iface.get("name"),
-                            # "ip-address", "mac-address" # filled by LCM
-                            # vim-id  # TODO it would be nice having a vim port id
-                        }
-                        vdur["interfaces"].append(vdu_iface)
-                    vnfr_descriptor["vdur"].append(vdur)
-
-                step = "creating vnfr vnfd-id='{}' constituent-vnfd='{}' at database".format(
-                    member_vnf["vnfd-id-ref"], member_vnf["member-vnf-index"])
-                self._format_new_data(session, "vnfrs", vnfr_descriptor)
-                self.db.create("vnfrs", vnfr_descriptor)
-                rollback.insert(0, {"item": "vnfrs", "_id": vnfr_id})
-                nsr_descriptor["constituent-vnfr-ref"].append(vnfr_id)
-
-            step = "creating nsr at database"
-            self._format_new_data(session, "nsrs", nsr_descriptor)
-            self.db.create("nsrs", nsr_descriptor)
-            rollback.insert(rollback_index, {"item": "nsrs", "_id": nsr_id})
-            return nsr_id
-        except Exception as e:
-            raise EngineException("Error {}: {}".format(step, e))
-
-    @staticmethod
-    def _update_descriptor(desc, kwargs):
-        """
-        Update descriptor with the kwargs. It contains dot separated keys
-        :param desc: dictionary to be updated
-        :param kwargs: plain dictionary to be used for updating.
-        :return:
-        """
-        if not kwargs:
-            return
-        try:
-            for k, v in kwargs.items():
-                update_content = desc
-                kitem_old = None
-                klist = k.split(".")
-                for kitem in klist:
-                    if kitem_old is not None:
-                        update_content = update_content[kitem_old]
-                    if isinstance(update_content, dict):
-                        kitem_old = kitem
-                    elif isinstance(update_content, list):
-                        kitem_old = int(kitem)
-                    else:
-                        raise EngineException(
-                            "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
-                update_content[kitem_old] = v
-        except KeyError:
-            raise EngineException(
-                "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
-        except ValueError:
-            raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
-                k, kitem))
-        except IndexError:
-            raise EngineException(
-                "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
-
-    def new_item(self, rollback, session, item, indata={}, kwargs=None, headers={}, force=False):
+    def new_item(self, rollback, session, topic, indata=None, kwargs=None, headers=None, force=False):
         """
         Creates a new entry into database. For nsds and vnfds it creates an almost empty DISABLED  entry,
         that must be completed with a call to method upload_content
-        :param rollback: list where this method appends created items at database in case a rollback may to be done
+        :param rollback: list to append created items at database in case a rollback must to be done
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vim_accounts, sdns, nsrs, nsds, vnfds
+        :param topic: it can be: users, projects, vim_accounts, sdns, nsrs, nsds, vnfds
         :param indata: data to be inserted
         :param kwargs: used to override the indata descriptor
         :param headers: http request headers
         :param force: If True avoid some dependence checks
         :return: _id: identity of the inserted data.
         """
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].new(rollback, session, indata, kwargs, headers, force)
 
-        if not session["admin"] and item in ("users", "projects"):
-            raise EngineException("Needed admin privileges to perform this operation", HTTPStatus.UNAUTHORIZED)
-
-        try:
-            item_envelop = item
-            if item in ("nsds", "vnfds"):
-                item_envelop = "userDefinedData"
-            content = self._remove_envelop(item_envelop, indata)
-
-            # Override descriptor with query string kwargs
-            self._update_descriptor(content, kwargs)
-            if not content and item not in ("nsds", "vnfds"):
-                raise EngineException("Empty payload")
-
-            validate_input(content, item, new=True)
-
-            if item == "nsrs":
-                # in this case the input descriptor is not the data to be stored
-                return self.new_nsr(rollback, session, ns_request=content)
-
-            self._validate_new_data(session, item_envelop, content, force=force)
-            if item in ("nsds", "vnfds"):
-                content = {"_admin": {"userDefinedData": content}}
-            self._format_new_data(session, item, content)
-            _id = self.db.create(item, content)
-            rollback.insert(0, {"item": item, "_id": _id})
-
-            if item == "vim_accounts":
-                msg_data = self.db.get_one(item, {"_id": _id})
-                msg_data.pop("_admin", None)
-                self.msg.write("vim_account", "create", msg_data)
-            elif item == "sdns":
-                msg_data = self.db.get_one(item, {"_id": _id})
-                msg_data.pop("_admin", None)
-                self.msg.write("sdn", "create", msg_data)
-            return _id
-        except ValidationError as e:
-            raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
-
-    def new_nslcmop(self, session, nsInstanceId, operation, params):
-        now = time()
-        _id = str(uuid4())
-        nslcmop = {
-            "id": _id,
-            "_id": _id,
-            "operationState": "PROCESSING",  # COMPLETED,PARTIALLY_COMPLETED,FAILED_TEMP,FAILED,ROLLING_BACK,ROLLED_BACK
-            "statusEnteredTime": now,
-            "nsInstanceId": nsInstanceId,
-            "lcmOperationType": operation,
-            "startTime": now,
-            "isAutomaticInvocation": False,
-            "operationParams": params,
-            "isCancelPending": False,
-            "links": {
-                "self": "/osm/nslcm/v1/ns_lcm_op_occs/" + _id,
-                "nsInstance": "/osm/nslcm/v1/ns_instances/" + nsInstanceId,
-            }
-        }
-        return nslcmop
-
-    def ns_operation(self, rollback, session, nsInstanceId, operation, indata, kwargs=None):
+    def upload_content(self, session, topic, _id, indata, kwargs, headers, force=False):
         """
-        Performs a new operation over a ns
-        :param rollback: list where this method appends created items at database in case a rollback may to be done
+        Upload content for an already created entry (_id)
         :param session: contains the used login username and working project
-        :param nsInstanceId: _id of the nsr to perform the operation
-        :param operation: it can be: instantiate, terminate, action, TODO: update, heal
-        :param indata: descriptor with the parameters of the operation
+        :param topic: it can be: users, projects, vnfds, nsds,
+        :param _id: server id of the item
+        :param indata: data to be inserted
         :param kwargs: used to override the indata descriptor
-        :return: id of the nslcmops
+        :param headers: http request headers
+        :param force: If True avoid some dependence checks
+        :return: _id: identity of the inserted data.
         """
-        try:
-            # Override descriptor with query string kwargs
-            self._update_descriptor(indata, kwargs)
-            validate_input(indata, "ns_" + operation, new=True)
-            # get ns from nsr_id
-            nsr = self.get_item(session, "nsrs", nsInstanceId)
-            if not nsr["_admin"].get("nsState") or nsr["_admin"]["nsState"] == "NOT_INSTANTIATED":
-                if operation == "terminate" and indata.get("autoremove"):
-                    # NSR must be deleted
-                    return self.del_item(session, "nsrs", nsInstanceId)
-                if operation != "instantiate":
-                    raise EngineException("ns_instance '{}' cannot be '{}' because it is not instantiated".format(
-                        nsInstanceId, operation), HTTPStatus.CONFLICT)
-            else:
-                if operation == "instantiate" and not indata.get("force"):
-                    raise EngineException("ns_instance '{}' cannot be '{}' because it is already instantiated".format(
-                        nsInstanceId, operation), HTTPStatus.CONFLICT)
-            indata["nsInstanceId"] = nsInstanceId
-            self._check_ns_operation(session, nsr, operation, indata)
-            nslcmop = self.new_nslcmop(session, nsInstanceId, operation, indata)
-            self._format_new_data(session, "nslcmops", nslcmop)
-            _id = self.db.create("nslcmops", nslcmop)
-            rollback.insert(0, {"item": "nslcmops", "_id": _id})
-            indata["_id"] = _id
-            self.msg.write("ns", operation, nslcmop)
-            return _id
-        except ValidationError as e:
-            raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
-        # except DbException as e:
-        #     raise EngineException("Cannot get ns_instance '{}': {}".format(e), HTTPStatus.NOT_FOUND)
-
-    def _add_read_filter(self, session, item, filter):
-        if session["admin"]:  # allows all
-            return filter
-        if item == "users":
-            filter["username"] = session["username"]
-        elif item in ("vnfds", "nsds", "nsrs", "vnfrs"):
-            filter["_admin.projects_read.cont"] = ["ANY", session["project_id"]]
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].upload_content(session, _id, indata, kwargs, headers, force)
 
-    def _add_delete_filter(self, session, item, filter):
-        if not session["admin"] and item in ("users", "projects"):
-            raise EngineException("Only admin users can perform this task", http_code=HTTPStatus.FORBIDDEN)
-        if item == "users":
-            if filter.get("_id") == session["username"] or filter.get("username") == session["username"]:
-                raise EngineException("You cannot delete your own user", http_code=HTTPStatus.CONFLICT)
-        elif item == "project":
-            if filter.get("_id") == session["project_id"]:
-                raise EngineException("You cannot delete your own project", http_code=HTTPStatus.CONFLICT)
-        elif item in ("vnfds", "nsds") and not session["admin"]:
-            filter["_admin.projects_write.cont"] = ["ANY", session["project_id"]]
-
-    def get_file(self, session, item, _id, path=None, accept_header=None):
+    def get_item_list(self, session, topic, filter_q=None):
         """
-        Return the file content of a vnfd or nsd
+        Get a list of items
         :param session: contains the used login username and working project
-        :param item: it can be vnfds or nsds
-        :param _id: Identity of the vnfd, ndsd
-        :param path: artifact path or "$DESCRIPTOR" or None
-        :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
-        :return: opened file or raises an exception
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param filter_q: filter of data to be applied
+        :return: The list, it can be empty if no one match the filter_q.
         """
-        accept_text = accept_zip = False
-        if accept_header:
-            if 'text/plain' in accept_header or '*/*' in accept_header:
-                accept_text = True
-            if 'application/zip' in accept_header or '*/*' in accept_header:
-                accept_zip = True
-        if not accept_text and not accept_zip:
-            raise EngineException("provide request header 'Accept' with 'application/zip' or 'text/plain'",
-                                  http_code=HTTPStatus.NOT_ACCEPTABLE)
-
-        content = self.get_item(session, item, _id)
-        if content["_admin"]["onboardingState"] != "ONBOARDED":
-            raise EngineException("Cannot get content because this resource is not at 'ONBOARDED' state. "
-                                  "onboardingState is {}".format(content["_admin"]["onboardingState"]),
-                                  http_code=HTTPStatus.CONFLICT)
-        storage = content["_admin"]["storage"]
-        if path is not None and path != "$DESCRIPTOR":   # artifacts
-            if not storage.get('pkg-dir'):
-                raise EngineException("Packages does not contains artifacts", http_code=HTTPStatus.BAD_REQUEST)
-            if self.fs.file_exists((storage['folder'], storage['pkg-dir'], *path), 'dir'):
-                folder_content = self.fs.dir_ls((storage['folder'], storage['pkg-dir'], *path))
-                return folder_content, "text/plain"
-                # TODO manage folders in http
-            else:
-                return self.fs.file_open((storage['folder'], storage['pkg-dir'], *path), "rb"),\
-                    "application/octet-stream"
-
-        # pkgtype   accept  ZIP  TEXT    -> result
-        # manyfiles         yes  X       -> zip
-        #                   no   yes     -> error
-        # onefile           yes  no      -> zip
-        #                   X    yes     -> text
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].list(session, filter_q)
 
-        if accept_text and (not storage.get('pkg-dir') or path == "$DESCRIPTOR"):
-            return self.fs.file_open((storage['folder'], storage['descriptor']), "r"), "text/plain"
-        elif storage.get('pkg-dir') and not accept_zip:
-            raise EngineException("Packages that contains several files need to be retrieved with 'application/zip'"
-                                  "Accept header", http_code=HTTPStatus.NOT_ACCEPTABLE)
-        else:
-            if not storage.get('zipfile'):
-                # TODO generate zipfile if not present
-                raise EngineException("Only allowed 'text/plain' Accept header for this descriptor. To be solved in "
-                                      "future versions", http_code=HTTPStatus.NOT_ACCEPTABLE)
-            return self.fs.file_open((storage['folder'], storage['zipfile']), "rb"), "application/zip"
-
-    def get_item_list(self, session, item, filter={}):
+    def get_item(self, session, topic, _id):
         """
-        Get a list of items
+        Get complete information on an item
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param filter: filter of data to be applied
-        :return: The list, it can be empty if no one match the filter.
+        :param topic: it can be: users, projects, vnfds, nsds,
+        :param _id: server id of the item
+        :return: dictionary, raise exception if not found.
         """
-        # TODO add admin to filter, validate rights
-        # TODO transform data for SOL005 URL requests. Transform filtering
-        # TODO implement "field-type" query string SOL005
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].show(session, _id)
 
-        self._add_read_filter(session, item, filter)
-        return self.db.get_list(item, filter)
-
-    def get_item(self, session, item, _id):
+    def get_file(self, session, topic, _id, path=None, accept_header=None):
         """
-        Get complete information on an items
+        Get descriptor package or artifact file content
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds,
+        :param topic: it can be: users, projects, vnfds, nsds,
         :param _id: server id of the item
-        :return: dictionary, raise exception if not found.
+        :param path: artifact path or "$DESCRIPTOR" or None
+        :param accept_header: Content of Accept header. Must contain applition/zip or/and text/plain
+        :return: opened file plus Accept format or raises an exception
         """
-        filter = {"_id": _id}
-        # TODO add admin to filter, validate rights
-        # TODO transform data for SOL005 URL requests
-        self._add_read_filter(session, item, filter)
-        return self.db.get_one(item, filter)
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].get_file(session, _id, path, accept_header)
 
-    def del_item_list(self, session, item, filter={}):
+    def del_item_list(self, session, topic, _filter=None):
         """
         Delete a list of items
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param filter: filter of data to be applied
-        :return: The deleted list, it can be empty if no one match the filter.
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param _filter: filter of data to be applied
+        :return: The deleted list, it can be empty if no one match the _filter.
         """
-        # TODO add admin to filter, validate rights
-        self._add_read_filter(session, item, filter)
-        return self.db.del_list(item, filter)
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].delete_list(session, _filter)
 
-    def del_item(self, session, item, _id, force=False):
+    def del_item(self, session, topic, _id, force=False):
         """
         Delete item by its internal id
         :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
+        :param topic: it can be: users, projects, vnfds, nsds, ...
         :param _id: server id of the item
         :param force: indicates if deletion must be forced in case of conflict
         :return: dictionary with deleted item _id. It raises exception if not found.
         """
-        # TODO add admin to filter, validate rights
-        # data = self.get_item(item, _id)
-        filter = {"_id": _id}
-        self._add_delete_filter(session, item, filter)
-        if item in ("vnfds", "nsds") and not force:
-            descriptor = self.get_item(session, item, _id)
-            descriptor_id = descriptor.get("id")
-            if descriptor_id:
-                self._check_dependencies_on_descriptor(session, item, descriptor_id, _id)
-        elif item == "projects":
-            if not force:
-                self._check_project_dependencies(_id)
-
-        if item == "nsrs":
-            nsr = self.db.get_one(item, filter)
-            if nsr["_admin"].get("nsState") == "INSTANTIATED" and not force:
-                raise EngineException("nsr '{}' cannot be deleted because it is in 'INSTANTIATED' state. "
-                                      "Launch 'terminate' operation first; or force deletion".format(_id),
-                                      http_code=HTTPStatus.CONFLICT)
-            v = self.db.del_one(item, {"_id": _id})
-            self.db.del_list("nslcmops", {"nsInstanceId": _id})
-            self.db.del_list("vnfrs", {"nsr-id-ref": _id})
-            self.msg.write("ns", "deleted", {"_id": _id})
-            return v
-        if item in ("vim_accounts", "sdns") and not force:
-            self.db.set_one(item, {"_id": _id}, {"_admin.to_delete": True})   # TODO change status
-            if item == "vim_accounts":
-                self.msg.write("vim_account", "delete", {"_id": _id})
-            elif item == "sdns":
-                self.msg.write("sdn", "delete", {"_id": _id})
-            return {"deleted": 1}  # TODO indicate an offline operation to return 202 ACCEPTED
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].delete(session, _id, force)
 
-        v = self.db.del_one(item, filter)
-        if item in ("vnfds", "nsds"):
-            self.fs.file_delete(_id, ignore_non_exist=True)
-        if item in ("vim_accounts", "sdns", "vnfds", "nsds"):
-            self.msg.write(item[:-1], "deleted", {"_id": _id})
-        return v
-
-    def prune(self):
+    def edit_item(self, session, topic, _id, indata=None, kwargs=None, force=False):
         """
-        Prune database not needed content
-        :return: None
+        Update an existing entry at database
+        :param session: contains the used login username and working project
+        :param topic: it can be: users, projects, vnfds, nsds, ...
+        :param _id: identifier to be updated
+        :param indata: data to be inserted
+        :param kwargs: used to override the indata descriptor
+        :param force: If True avoid some dependence checks
+        :return: dictionary, raise exception if not found.
         """
-        return self.db.del_list("nsrs", {"_admin.to_delete": True})
+        if topic not in self.map_topic:
+            raise EngineException("Unknown topic {}!!!".format(topic), HTTPStatus.INTERNAL_SERVER_ERROR)
+        return self.map_topic[topic].edit(session, _id, indata, kwargs, force)
 
     def create_admin(self):
         """
@@ -1008,103 +235,55 @@ class Engine(object):
         if users:
             return None
             # raise EngineException("Unauthorized. Database users is not empty", HTTPStatus.UNAUTHORIZED)
-        indata = {"username": "admin", "password": "admin", "projects": ["admin"]}
-        fake_session = {"project_id": "admin", "username": "admin"}
-        self._format_new_data(fake_session, "users", indata)
-        _id = self.db.create("users", indata)
+        user_desc = {"username": "admin", "password": "admin", "projects": ["admin"]}
+        fake_session = {"project_id": "admin", "username": "admin", "admin": True}
+        roolback_list = []
+        _id = self.map_topic["users"].new(roolback_list, fake_session, user_desc, force=True)
         return _id
 
+    def upgrade_db(self, current_version, target_version):
+        if not target_version or current_version == target_version:
+            return
+        if target_version == '1.0':
+            if not current_version:
+                # create database version
+                serial = urandom(32)
+                version_data = {
+                    "_id": 'version',               # Always 'version'
+                    "version_int": 1000,            # version number
+                    "version": '1.0',               # version text
+                    "date": "2018-10-25",           # version date
+                    "description": "added serial",  # changes in this version
+                    'status': 'ENABLED',            # ENABLED, DISABLED (migration in process), ERROR,
+                    'serial': b64encode(serial)
+                }
+                self.db.create("admin", version_data)
+                self.db.set_secret_key(serial)
+            # TODO add future migrations here
+
+        raise EngineException("Wrong database version '{}'. Expected '{}'"
+                              ". It cannot be up/down-grade".format(current_version, target_version),
+                              http_code=HTTPStatus.INTERNAL_SERVER_ERROR)
+
     def init_db(self, target_version='1.0'):
         """
-        Init database if empty. If not empty it checks that database version is ok.
+        Init database if empty. If not empty it checks that database version and migrates if needed
         If empty, it creates a new user admin/admin at 'users' and a new entry at 'version'
+        :param target_version: check desired database version. Migrate to it if possible or raises exception
         :return: None if ok, exception if error or if the version is different.
         """
-        version = self.db.get_one("version", fail_on_empty=False, fail_on_more=False)
-        if not version:
-            # create user admin
-            self.create_admin()
-            # create database version
-            version_data = {
-                "_id": '1.0',                     # version text
-                "version": 1000,                  # version number
-                "date": "2018-04-12",             # version date
-                "description": "initial design",  # changes in this version
-                'status': 'ENABLED'               # ENABLED, DISABLED (migration in process), ERROR,
-            }
-            self.db.create("version", version_data)
-        elif version["_id"] != target_version:
-            # TODO implement migration process
-            raise EngineException("Wrong database version '{}'. Expected '{}'".format(
-                version["_id"], target_version), HTTPStatus.INTERNAL_SERVER_ERROR)
-        elif version["status"] != 'ENABLED':
-            raise EngineException("Wrong database status '{}'".format(
-                version["status"]), HTTPStatus.INTERNAL_SERVER_ERROR)
-        return
-
-    def _edit_item(self, session, item, id, content, indata={}, kwargs=None, force=False):
-        if indata:
-            indata = self._remove_envelop(item, indata)
 
-        # Override descriptor with query string kwargs
-        if kwargs:
-            try:
-                for k, v in kwargs.items():
-                    update_content = indata
-                    kitem_old = None
-                    klist = k.split(".")
-                    for kitem in klist:
-                        if kitem_old is not None:
-                            update_content = update_content[kitem_old]
-                        if isinstance(update_content, dict):
-                            kitem_old = kitem
-                        elif isinstance(update_content, list):
-                            kitem_old = int(kitem)
-                        else:
-                            raise EngineException(
-                                "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
-                    update_content[kitem_old] = v
-            except KeyError:
-                raise EngineException(
-                    "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
-            except ValueError:
-                raise EngineException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
-                    k, kitem))
-            except IndexError:
-                raise EngineException(
-                    "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))
-        try:
-            validate_input(indata, item, new=False)
-        except ValidationError as e:
-            raise EngineException(e, HTTPStatus.UNPROCESSABLE_ENTITY)
+        version_data = self.db.get_one("admin", {"_id": "version"}, fail_on_empty=False, fail_on_more=True)
+        # check database status is ok
+        if version_data and version_data.get("status") != 'ENABLED':
+            raise EngineException("Wrong database status '{}'".format(
+                version_data["status"]), HTTPStatus.INTERNAL_SERVER_ERROR)
 
-        self._check_edition(session, item, indata, id, force)
-        deep_update(content, indata)
-        self._validate_new_data(session, item, content, id=id, force=force)
-        # self._format_new_data(session, item, content)
-        self.db.replace(item, id, content)
-        if item in ("vim_accounts", "sdns"):
-            indata.pop("_admin", None)
-            indata["_id"] = id
-            if item == "vim_accounts":
-                self.msg.write("vim_account", "edit", indata)
-            elif item == "sdns":
-                self.msg.write("sdn", "edit", indata)
-        return id
+        # check version
+        db_version = None if not version_data else version_data.get("version")
+        if db_version != target_version:
+            self.upgrade_db(db_version, target_version)
 
-    def edit_item(self, session, item, _id, indata={}, kwargs=None, force=False):
-        """
-        Update an existing entry at database
-        :param session: contains the used login username and working project
-        :param item: it can be: users, projects, vnfds, nsds, ...
-        :param _id: identifier to be updated
-        :param indata: data to be inserted
-        :param kwargs: used to override the indata descriptor
-        :param force: If True avoid some dependence checks
-        :return: dictionary, raise exception if not found.
-        """
-        if not session["admin"] and item == "projects":
-            raise EngineException("Needed admin privileges to perform this operation", HTTPStatus.UNAUTHORIZED)
-
-        content = self.get_item(session, item, _id)
-        return self._edit_item(session, item, _id, content, indata, kwargs, force)
+        # create user admin if not exist
+        self.create_admin()
+        return