osm_lcm/ROclient.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

##
# Copyright 2015 Telefónica Investigación y Desarrollo, S.A.U.
# This file is part of openmano
# All Rights Reserved.
#
# 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.
#
# For those usages not covered by the Apache License, Version 2.0 please
# contact with: nfvlabs@tid.es
##

"""
asyncio RO python client to interact with RO-server
"""

import asyncio
import aiohttp
import json
import yaml
import logging
from urllib.parse import quote
from uuid import UUID
from copy import deepcopy

__author__ = "Alfonso Tierno"
__date__ = "$09-Jan-2018 09:09:48$"
__version__ = "0.1.2"
version_date = "2018-05-16"
requests = None


class ROClientException(Exception):
    def __init__(self, message, http_code=400):
        """Common Exception for all RO client exceptions"""
        self.http_code = http_code
        Exception.__init__(self, message)


def remove_envelop(item, indata=None):
    """
    Obtain the useful data removing the envelop. It goes through the vnfd or nsd catalog and returns the
    vnfd or nsd content
    :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
    :param indata: Content to be inspected
    :return: the useful part of indata (a reference, not a new dictionay)
    """
    clean_indata = indata
    if not indata:
        return {}
    if item == "vnfd":
        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 ROClientException("'vnfd' must be a list only one element")
            clean_indata = clean_indata['vnfd'][0]
    elif item == "nsd":
        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 ROClientException("'nsd' must be a list only one element")
            clean_indata = clean_indata['nsd'][0]
    elif item == "sdn":
        if len(indata) == 1 and "sdn_controller" in indata:
            clean_indata = indata["sdn_controller"]
    elif item == "tenant":
        if len(indata) == 1 and "tenant" in indata:
            clean_indata = indata["tenant"]
    elif item in ("vim", "vim_account", "datacenters"):
        if len(indata) == 1 and "datacenter" in indata:
            clean_indata = indata["datacenter"]
    elif item == "ns" or item == "instances":
        if len(indata) == 1 and "instance" in indata:
            clean_indata = indata["instance"]
    else:
        assert False, "remove_envelop with unknown item {}".format(item)

    return clean_indata


class ROClient:
    headers_req = {'Accept': 'application/yaml', 'content-type': 'application/yaml'}
    client_to_RO = {'tenant': 'tenants', 'vim': 'datacenters', 'vim_account': 'datacenters', 'sdn': 'sdn_controllers',
                    'vnfd': 'vnfs', 'nsd': 'scenarios',
                    'ns': 'instances'}
    mandatory_for_create = {
        'tenant': ("name", ),
        'vnfd': ("name", "id", "connection-point", "vdu"),
        'nsd': ("name", "id", "constituent-vnfd"),
        'ns': ("name", "scenario", "datacenter"),
        'vim': ("name", "vim_url"),
        'vim_account': (),
        'sdn': ("name", "port", 'ip', 'dpid', 'type'),
    }
    timeout_large = 120
    timeout_short = 30

    def __init__(self, loop, endpoint_url, **kwargs):
        self.loop = loop
        self.endpoint_url = endpoint_url

        self.username = kwargs.get("username")
        self.password = kwargs.get("password")
        self.tenant_id_name = kwargs.get("tenant")
        self.tenant = None
        self.datacenter_id_name = kwargs.get("datacenter")
        self.datacenter = None
        logger_name = kwargs.get('logger_name', 'ROClient')
        self.logger = logging.getLogger(logger_name)
        if kwargs.get("loglevel"):
            self.logger.setLevel(kwargs["loglevel"])
        global requests
        requests = kwargs.get("TODO remove")

    def __getitem__(self, index):
        if index == 'tenant':
            return self.tenant_id_name
        elif index == 'datacenter':
            return self.datacenter_id_name
        elif index == 'username':
            return self.username
        elif index == 'password':
            return self.password
        elif index == 'endpoint_url':
            return self.endpoint_url
        else:
            raise KeyError("Invalid key '{}'".format(index))
        
    def __setitem__(self, index, value):
        if index == 'tenant':
            self.tenant_id_name = value
        elif index == 'datacenter' or index == 'vim':
            self.datacenter_id_name = value
        elif index == 'username':
            self.username = value
        elif index == 'password':
            self.password = value
        elif index == 'endpoint_url':
            self.endpoint_url = value
        else:
            raise KeyError("Invalid key '{}'".format(index))
        self.tenant = None      # force to reload tenant with different credentials
        self.datacenter = None  # force to reload datacenter with different credentials

    def _parse(self, descriptor, descriptor_format, response=False):
        if descriptor_format and descriptor_format != "json" and descriptor_format != "yaml":
            raise ROClientException("'descriptor_format' must be a 'json' or 'yaml' text")
        if descriptor_format != "json":
            try:
                return yaml.load(descriptor)
            except yaml.YAMLError as exc:
                error_pos = ""
                if hasattr(exc, 'problem_mark'):
                    mark = exc.problem_mark
                    error_pos = " at line:{} column:{}s".format(mark.line + 1, mark.column + 1)
                error_text = "yaml format error" + error_pos
        elif descriptor_format != "yaml":
            try:
                return json.loads(descriptor)
            except Exception as e:
                if response:
                    error_text = "json format error" + str(e)

        if response:
            raise ROClientException(error_text)
        raise ROClientException(error_text)
    
    def _parse_yaml(self, descriptor, response=False):
        try:
            return yaml.load(descriptor)
        except yaml.YAMLError as exc:
            error_pos = ""
            if hasattr(exc, 'problem_mark'):
                mark = exc.problem_mark
                error_pos = " at line:{} column:{}s".format(mark.line + 1, mark.column + 1)
            error_text = "yaml format error" + error_pos
            if response:
                raise ROClientException(error_text)
            raise ROClientException(error_text)

    @staticmethod
    def check_if_uuid(uuid_text):
        """
        Check if text correspond to an uuid foramt
        :param uuid_text:
        :return: True if it is an uuid False if not
        """
        try:
            UUID(uuid_text)
            return True
        except (ValueError, TypeError):
            return False

    @staticmethod
    def _create_envelop(item, indata=None):
        """
        Returns a new dict that incledes indata with the expected envelop
        :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
        :param indata: Content to be enveloped
        :return: a new dic with {<envelop>: {indata} } where envelop can be e.g. tenant, datacenter, ...
        """
        if item == "vnfd":
            return {'vnfd-catalog': {'vnfd': [indata]}}
        elif item == "nsd":
            return {'nsd-catalog': {'nsd': [indata]}}
        elif item == "tenant":
            return {'tenant': indata}
        elif item in ("vim", "vim_account", "datacenter"):
            return {'datacenter': indata}
        elif item == "ns" or item == "instances":
            return {'instance': indata}
        elif item == "sdn":
            return {'sdn_controller': indata}
        else:
            assert False, "_create_envelop with unknown item {}".format(item)

    @staticmethod
    def update_descriptor(desc, kwargs):
        desc = deepcopy(desc)  # do not modify original descriptor
        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 ROClientException(
                            "Invalid query string '{}'. Descriptor is not a list nor dict at '{}'".format(k, kitem))
                if v == "__DELETE__":
                    del update_content[kitem_old]
                else:
                    update_content[kitem_old] = v
            return desc
        except KeyError:
            raise ROClientException(
                "Invalid query string '{}'. Descriptor does not contain '{}'".format(k, kitem_old))
        except ValueError:
            raise ROClientException("Invalid query string '{}'. Expected integer index list instead of '{}'".format(
                k, kitem))
        except IndexError:
            raise ROClientException(
                "Invalid query string '{}'. Index '{}' out of  range".format(k, kitem_old))

    @staticmethod
    def check_ns_status(ns_descriptor):
        """
        Inspect RO instance descriptor and indicates the status
        :param ns_descriptor: instance descriptor obtained with self.show("ns", )
        :return: status, message: status can be BUILD,ACTIVE,ERROR, message is a text message
        """
        net_total = 0
        vm_total = 0
        net_done = 0
        vm_done = 0

        for net in ns_descriptor["nets"]:
            net_total += 1
            if net["status"] in ("ERROR", "VIM_ERROR"):
                return "ERROR", net["error_msg"]
            elif net["status"] == "ACTIVE":
                net_done += 1
        for vnf in ns_descriptor["vnfs"]:
            for vm in vnf["vms"]:
                vm_total += 1
                if vm["status"] in ("ERROR", "VIM_ERROR"):
                    return "ERROR", vm["error_msg"]
                elif vm["status"] == "ACTIVE":
                    vm_done += 1

        if net_total == net_done and vm_total == vm_done:
            return "ACTIVE", "VMs {}, networks: {}".format(vm_total, net_total)
        else:
            return "BUILD", "VMs: {}/{}, networks: {}/{}".format(vm_done, vm_total, net_done, net_total)

    @staticmethod
    def get_ns_vnf_info(ns_descriptor):
        """
        Get a dict with the VIM_id, ip_addresses, mac_addresses of every vnf and vdu
        :param ns_descriptor: instance descriptor obtained with self.show("ns", )
        :return: dict with {<member_vnf_index>: {ip_address: XXXX, vdur:{ip_address: XXX, vim_id: XXXX}}}
        """
        ns_info = {}
        for vnf in ns_descriptor["vnfs"]:
            if not vnf.get("ip_address"):
                raise ROClientException("ns member_vnf_index '{}' has no IP address".format(
                    vnf["member_vnf_index"]), http_code=409)
            vnfr_info = {
                "ip_address": vnf.get("ip_address"),
                "vdur": {}
            }
            for vm in vnf["vms"]:
                vdur = {
                    "vim_id": vm.get("vim_vm_id"),
                    "ip_address": vm.get("ip_address")
                }
                for iface in vm["interfaces"]:
                    if iface.get("type") == "mgmt" and not iface.get("ip_address"):
                        raise ROClientException("ns member_vnf_index '{}' vm '{}' management interface '{}' has no IP "
                                                "address".format(vnf["member_vnf_index"], vm["vdu_osm_id"],
                                                                 iface["external_name"]), http_code=409)
                vnfr_info["vdur"][vm["vdu_osm_id"]] = vdur
            ns_info[str(vnf["member_vnf_index"])] = vnfr_info
        return ns_info

    async def _get_item_uuid(self, session, item, item_id_name, all_tenants=False):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant

        item_id = 0
        url = "{}{}/{}".format(self.endpoint_url, tenant_text, item)
        if self.check_if_uuid(item_id_name):
            item_id = item_id_name
            url += "/" + item_id_name
        elif item_id_name and item_id_name.startswith("'") and item_id_name.endswith("'"):
            item_id_name = item_id_name[1:-1]
        self.logger.debug("RO GET %s", url)
        with aiohttp.Timeout(self.timeout_short):
            async with session.get(url, headers=self.headers_req) as response:
                response_text = await response.read()
                self.logger.debug("GET {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status == 404:  # NOT_FOUND
                    raise ROClientException("No {} found with id '{}'".format(item[:-1], item_id_name),
                                            http_code=404)
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)
            content = self._parse_yaml(response_text, response=True)

        if item_id:
            return item_id
        desc = content[item]
        assert isinstance(desc, list), "_get_item_uuid get a non dict with a list inside {}".format(type(desc))
        uuid = None
        for i in desc:
            if item_id_name and i["name"] != item_id_name:
                continue
            if uuid:  # found more than one
                raise ROClientException(
                    "Found more than one {} with name '{}'. uuid must be used".format(item, item_id_name),
                    http_code=404)
            uuid = i["uuid"]
        if not uuid:
            raise ROClientException("No {} found with name '{}'".format(item[:-1], item_id_name), http_code=404)
        return uuid

    async def _get_item(self, session, item, item_id_name, all_tenants=False):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant

        if self.check_if_uuid(item_id_name):
            uuid = item_id_name
        else:
            # check that exist
            uuid = await self._get_item_uuid(session, item, item_id_name, all_tenants)

        url = "{}{}/{}/{}".format(self.endpoint_url, tenant_text, item, uuid)
        self.logger.debug("GET %s", url)
        with aiohttp.Timeout(self.timeout_short):
            async with session.get(url, headers=self.headers_req) as response:
                response_text = await response.read()
                self.logger.debug("GET {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)

        return self._parse_yaml(response_text, response=True)

    async def _get_tenant(self, session):
        if not self.tenant:
            self.tenant = await self._get_item_uuid(session, "tenants", self.tenant_id_name, None)
        return self.tenant
    
    async def _get_datacenter(self, session):
        if not self.tenant:
            await self._get_tenant(session)
        if not self.datacenter:
            self.datacenter = await self._get_item_uuid(session, "datacenters", self.datacenter_id_name, True)
        return self.datacenter

    async def _create_item(self, session, item, descriptor, item_id_name=None, action=None, all_tenants=False):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant
        payload_req = yaml.safe_dump(descriptor)
        # print payload_req

        api_version_text = ""
        if item == "vnfs":
            # assumes version v3 only
            api_version_text = "/v3"
            item = "vnfd"
        elif item == "scenarios":
            # assumes version v3 only
            api_version_text = "/v3"
            item = "nsd"

        if not item_id_name:
            uuid = ""
        elif self.check_if_uuid(item_id_name):
            uuid = "/{}".format(item_id_name)
        else:
            # check that exist
            uuid = await self._get_item_uuid(session, item, item_id_name, all_tenants)
            uuid = "/{}".format(uuid)
        if not action:
            action = ""
        else:
            action = "/".format(action)

        url = "{}{apiver}{tenant}/{item}{id}{action}".format(self.endpoint_url, apiver=api_version_text,
                                                             tenant=tenant_text, item=item, id=uuid, action=action)
        self.logger.debug("RO POST %s %s", url, payload_req)
        with aiohttp.Timeout(self.timeout_large):
            async with session.post(url, headers=self.headers_req, data=payload_req) as response:
                response_text = await response.read()
                self.logger.debug("POST {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)

        return self._parse_yaml(response_text, response=True)

    async def _del_item(self, session, item, item_id_name, all_tenants=False):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant
        if not self.check_if_uuid(item_id_name):
            # check that exist
            _all_tenants = all_tenants
            if item == "datacenters":
                _all_tenants = True
            uuid = await self._get_item_uuid(session, item, item_id_name, all_tenants=_all_tenants)
        else:
            uuid = item_id_name

        url = "{}{}/{}/{}".format(self.endpoint_url, tenant_text, item, uuid)
        self.logger.debug("DELETE %s", url)
        with aiohttp.Timeout(self.timeout_short):
            async with session.delete(url, headers=self.headers_req) as response:
                response_text = await response.read()
                self.logger.debug("DELETE {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)
        return self._parse_yaml(response_text, response=True)

    async def _list_item(self, session, item, all_tenants=False, filter_dict=None):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant

        url = "{}{}/{}".format(self.endpoint_url, tenant_text, item)
        separator = "?"
        if filter_dict:
            for k in filter_dict:
                url += separator + quote(str(k)) + "=" + quote(str(filter_dict[k]))
                separator = "&"
        self.logger.debug("RO GET %s", url)
        with aiohttp.Timeout(self.timeout_short):
            async with session.get(url, headers=self.headers_req) as response:
                response_text = await response.read()
                self.logger.debug("GET {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)
        return self._parse_yaml(response_text, response=True)

    async def _edit_item(self, session, item, item_id, descriptor, all_tenants=False):
        if all_tenants:
            tenant_text = "/any"
        elif all_tenants is None:
            tenant_text = ""
        else:
            if not self.tenant:
                await self._get_tenant(session)
            tenant_text = "/" + self.tenant

        payload_req = yaml.safe_dump(descriptor)
            
        # print payload_req
        url = "{}{}/{}/{}".format(self.endpoint_url, tenant_text, item, item_id)
        self.logger.debug("RO PUT %s %s", url, payload_req)
        with aiohttp.Timeout(self.timeout_large):
            async with session.put(url, headers=self.headers_req, data=payload_req) as response:
                response_text = await response.read()
                self.logger.debug("PUT {} [{}] {}".format(url, response.status, response_text[:100]))
                if response.status >= 300:
                    raise ROClientException(response_text, http_code=response.status)
        return self._parse_yaml(response_text, response=True)

    async def get_list(self, item, all_tenants=False, filter_by=None):
        """
        Obtain a list of items filtering by the specigy filter_by.
        :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
        :param all_tenants: True if not filtering by tenant. Only allowed for admin
        :param filter_by: dictionary with filtering
        :return: a list of dict. It can be empty. Raises ROClientException on Error,
        """
        try:
            if item not in self.client_to_RO:
                raise ROClientException("Invalid item {}".format(item))
            if item == 'tenant':
                all_tenants = None
            with aiohttp.ClientSession(loop=self.loop) as session:
                content = await self._list_item(session, self.client_to_RO[item], all_tenants=all_tenants,
                                                filter_dict=filter_by)
            if isinstance(content, dict):
                if len(content) == 1:
                    for _, v in content.items():
                        return v
                    return content.values()[0]
                else:
                    raise ROClientException("Output not a list neither dict with len equal 1", http_code=500)
                return content
        except aiohttp.errors.ClientOSError as e:
            raise ROClientException(e, http_code=504)

    async def show(self, item, item_id_name=None, all_tenants=False):
        """
        Obtain the information of an item from its id or name
        :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
        :param item_id_name: RO id or name of the item. Raise and exception if more than one found
        :param all_tenants: True if not filtering by tenant. Only allowed for admin
        :return: dictionary with the information or raises ROClientException on Error, NotFound, found several
        """
        try:
            if item not in self.client_to_RO:
                raise ROClientException("Invalid item {}".format(item))
            if item == 'tenant':
                all_tenants = None
            elif item == 'vim':
                all_tenants = True
            elif item == 'vim_account':
                all_tenants = False

            with aiohttp.ClientSession(loop=self.loop) as session:
                content = await self._get_item(session, self.client_to_RO[item], item_id_name, all_tenants=all_tenants)
                return remove_envelop(item, content)
        except aiohttp.errors.ClientOSError as e:
            raise ROClientException(e, http_code=504)

    async def delete(self, item, item_id_name=None, all_tenants=False):
        """
        Delete  the information of an item from its id or name
        :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns'
        :param item_id_name: RO id or name of the item. Raise and exception if more than one found
        :param all_tenants: True if not filtering by tenant. Only allowed for admin
        :return: dictionary with the information or raises ROClientException on Error, NotFound, found several
        """
        try:
            if item not in self.client_to_RO:
                raise ROClientException("Invalid item {}".format(item))
            if item == 'tenant' or item == 'vim':
                all_tenants = None

            with aiohttp.ClientSession(loop=self.loop) as session:
                return await self._del_item(session, self.client_to_RO[item], item_id_name, all_tenants=all_tenants)
        except aiohttp.errors.ClientOSError as e:
            raise ROClientException(e, http_code=504)

    async def edit(self, item, item_id_name, descriptor=None, descriptor_format=None, **kwargs):
        """ Edit an item
        :param item: can be 'tenant', 'vim', 'vnfd', 'nsd', 'ns', 'vim'
        :param descriptor: can be a dict, or a yaml/json text. Autodetect unless descriptor_format is provided
        :param descriptor_format: Can be 'json' or 'yaml'
        :param kwargs: Overrides descriptor with values as name, description, vim_url, vim_url_admin, vim_type
               keys can be a dot separated list to specify elements inside dict
        :return: dictionary with the information or raises ROClientException on Error
        """
        try:
            if isinstance(descriptor, str):
                descriptor = self._parse(descriptor, descriptor_format)
            elif descriptor:
                pass
            else:
                descriptor = {}

            if item not in self.client_to_RO:
                raise ROClientException("Invalid item {}".format(item))
            desc = remove_envelop(item, descriptor)

            # Override descriptor with kwargs
            if kwargs:
                desc = self.update_descriptor(desc, kwargs)
            all_tenants = False
            if item in ('tenant', 'vim'):
                all_tenants = None

            create_desc = self._create_envelop(item, desc)

            with aiohttp.ClientSession(loop=self.loop) as session:
                _all_tenants = all_tenants
                if item == 'vim':
                    _all_tenants = True
                item_id = await self._get_item_uuid(session, self.client_to_RO[item], item_id_name,
                                                    all_tenants=_all_tenants)
                # await self._get_tenant(session)
                outdata = await self._edit_item(session, self.client_to_RO[item], item_id, create_desc,
                                                all_tenants=_all_tenants)
                return remove_envelop(item, outdata)
        except aiohttp.errors.ClientOSError as e:
            raise ROClientException(e, http_code=504)

    async def create(self, item, descriptor=None, descriptor_format=None, **kwargs):
        """
        Creates an item from its descriptor
        :param item: can be 'tenant', 'vnfd', 'nsd', 'ns', 'vim', 'vim_account', 'sdn'
        :param descriptor: can be a dict, or a yaml/json text. Autodetect unless descriptor_format is provided
        :param descriptor_format: Can be 'json' or 'yaml'
        :param kwargs: Overrides descriptor with values as name, description, vim_url, vim_url_admin, vim_type
               keys can be a dot separated list to specify elements inside dict
        :return: dictionary with the information or raises ROClientException on Error
        """
        try:
            if isinstance(descriptor, str):
                descriptor = self._parse(descriptor, descriptor_format)
            elif descriptor:
                pass
            else:
                descriptor = {}

            if item not in self.client_to_RO:
                raise ROClientException("Invalid item {}".format(item))
            desc = remove_envelop(item, descriptor)

            # Override descriptor with kwargs
            if kwargs:
                desc = self.update_descriptor(desc, kwargs)

            for mandatory in self.mandatory_for_create[item]:
                if mandatory not in desc:
                    raise ROClientException("'{}' is mandatory parameter for {}".format(mandatory, item))

            all_tenants = False
            if item in ('tenant', 'vim'):
                all_tenants = None

            create_desc = self._create_envelop(item, desc)

            with aiohttp.ClientSession(loop=self.loop) as session:
                outdata = await self._create_item(session, self.client_to_RO[item], create_desc,
                                                  all_tenants=all_tenants)
                return remove_envelop(item, outdata)
        except aiohttp.errors.ClientOSError as e:
            raise ROClientException(e, http_code=504)

    async def attach_datacenter(self, datacenter=None, descriptor=None, descriptor_format=None, **kwargs):

        if isinstance(descriptor, str):
            descriptor = self._parse(descriptor, descriptor_format)
        elif descriptor:
            pass
        else:
            descriptor = {}
        desc = remove_envelop("vim", descriptor)

        # # check that exist
        # uuid = self._get_item_uuid(session, "datacenters", uuid_name, all_tenants=True)
        # tenant_text = "/" + self._get_tenant()
        if kwargs:
            desc = self.update_descriptor(desc, kwargs)

        if not desc.get("vim_tenant_name") and not desc.get("vim_tenant_id"):
            raise ROClientException("Wrong descriptor. At least vim_tenant_name or vim_tenant_id must be provided")
        create_desc = self._create_envelop("vim", desc)
        payload_req = yaml.safe_dump(create_desc)
        with aiohttp.ClientSession(loop=self.loop) as session:
            # check that exist
            item_id = await self._get_item_uuid(session, "datacenters", datacenter, all_tenants=True)
            await self._get_tenant(session)

            url = "{}/{tenant}/datacenters/{datacenter}".format(self.endpoint_url, tenant=self.tenant,
                                                                datacenter=item_id)
            self.logger.debug("RO POST %s %s", url, payload_req)
            with aiohttp.Timeout(self.timeout_large):
                async with session.post(url, headers=self.headers_req, data=payload_req) as response:
                    response_text = await response.read()
                    self.logger.debug("POST {} [{}] {}".format(url, response.status, response_text[:100]))
                    if response.status >= 300:
                        raise ROClientException(response_text, http_code=response.status)

            response_desc = self._parse_yaml(response_text, response=True)
            desc = remove_envelop("vim", response_desc)
            return desc

    async def detach_datacenter(self, datacenter=None):
        # TODO replace the code with delete_item(vim_account,...)
        with aiohttp.ClientSession(loop=self.loop) as session:
            # check that exist
            item_id = await self._get_item_uuid(session, "datacenters", datacenter, all_tenants=False)
            tenant = await self._get_tenant(session)

            url = "{}/{tenant}/datacenters/{datacenter}".format(self.endpoint_url, tenant=tenant,
                                                                datacenter=item_id)
            self.logger.debug("RO DELETE %s", url)
            with aiohttp.Timeout(self.timeout_large):
                async with session.delete(url, headers=self.headers_req) as response:
                    response_text = await response.read()
                    self.logger.debug("DELETE {} [{}] {}".format(url, response.status, response_text[:100]))
                    if response.status >= 300:
                        raise ROClientException(response_text, http_code=response.status)

            response_desc = self._parse_yaml(response_text, response=True)
            desc = remove_envelop("vim", response_desc)
            return desc

    # TODO convert to asyncio
    # DATACENTERS

    def edit_datacenter(self, uuid=None, name=None, descriptor=None, descriptor_format=None, all_tenants=False,
                        **kwargs):
        """Edit the parameters of a datacenter
        Params: must supply a descriptor or/and a parameter to change
            uuid or/and name. If only name is supplied, there must be only one or an exception is raised
            descriptor: with format {'datacenter':{params to change info}}
                must be a dictionary or a json/yaml text.
            parameters to change can be supplyied by the descriptor or as parameters:
                new_name: the datacenter name
                vim_url: the datacenter URL
                vim_url_admin: the datacenter URL for administrative issues
                vim_type: the datacenter type, can be openstack or openvim.
                public: boolean, available to other tenants
                description: datacenter description
        Return: Raises an exception on error, not found or found several
                Obtain a dictionary with format {'datacenter':{new_datacenter_info}}
        """

        if isinstance(descriptor, str):
            descriptor = self.parse(descriptor, descriptor_format)
        elif descriptor:
            pass
        elif kwargs:
            descriptor = {"datacenter": {}}
        else:
            raise ROClientException("Missing descriptor")

        if 'datacenter' not in descriptor or len(descriptor) != 1:
            raise ROClientException("Descriptor must contain only one 'datacenter' field")
        for param in kwargs:
            if param == 'new_name':
                descriptor['datacenter']['name'] = kwargs[param]
            else:
                descriptor['datacenter'][param] = kwargs[param]
        return self._edit_item("datacenters", descriptor, uuid, name, all_tenants=None)

    def edit_scenario(self, uuid=None, name=None, descriptor=None, descriptor_format=None, all_tenants=False, **kwargs):
        """Edit the parameters of a scenario
        Params: must supply a descriptor or/and a parameters to change
            uuid or/and name. If only name is supplied, there must be only one or an exception is raised
            descriptor: with format {'scenario':{params to change info}}
                must be a dictionary or a json/yaml text.
            parameters to change can be supplyied by the descriptor or as parameters:
                new_name: the scenario name
                public: boolean, available to other tenants
                description: scenario description
                tenant_id. Propietary tenant
        Return: Raises an exception on error, not found or found several
                Obtain a dictionary with format {'scenario':{new_scenario_info}}
        """

        if isinstance(descriptor, str):
            descriptor = self.parse(descriptor, descriptor_format)
        elif descriptor:
            pass
        elif kwargs:
            descriptor = {"scenario": {}}
        else:
            raise ROClientException("Missing descriptor")

        if 'scenario' not in descriptor or len(descriptor) > 2:
            raise ROClientException("Descriptor must contain only one 'scenario' field")
        for param in kwargs:
            if param == 'new_name':
                descriptor['scenario']['name'] = kwargs[param]
            else:
                descriptor['scenario'][param] = kwargs[param]
        return self._edit_item("scenarios", descriptor, uuid, name, all_tenants=None)

    # VIM ACTIONS
    def vim_action(self, action, item, uuid=None, all_tenants=False, **kwargs):
        """Perform an action over a vim
        Params:
            action: can be 'list', 'get'/'show', 'delete' or 'create'
            item: can be 'tenants' or 'networks'
            uuid: uuid of the tenant/net to show or to delete. Ignore otherwise
            other parameters:
                datacenter_name, datacenter_id: datacenters to act on, if missing uses classes store datacenter
                descriptor, descriptor_format: descriptor needed on creation, can be a dict or a yaml/json str
                    must be a dictionary or a json/yaml text.
                name: for created tenant/net Overwrite descriptor name if any
                description: tenant descriptor. Overwrite descriptor description if any

        Return: Raises an exception on error
                Obtain a dictionary with format {'tenant':{new_tenant_info}}
        """
        session = None  # TODO remove when changed to asyncio
        if item not in ("tenants", "networks", "images"):
            raise ROClientException("Unknown value for item '{}', must be 'tenants', 'nets' or "
                                    "images".format(str(item)))

        image_actions = ['list', 'get', 'show', 'delete']
        if item == "images" and action not in image_actions:
            raise ROClientException("Only available actions for item '{}' are {}\n"
                                    "Requested action was '{}'".format(item, ', '.join(image_actions), action))
        if all_tenants:
            tenant_text = "/any"
        else:
            tenant_text = "/" + self._get_tenant()

        if "datacenter_id" in kwargs or "datacenter_name" in kwargs:
            datacenter = self._get_item_uuid(session, "datacenters", kwargs.get("datacenter"), all_tenants=all_tenants)
        else:
            datacenter = self.get_datacenter(session)

        if action == "list":
            url = "{}{}/vim/{}/{}".format(self.endpoint_url, tenant_text, datacenter, item)
            self.logger.debug("GET %s", url)
            mano_response = requests.get(url, headers=self.headers_req)
            self.logger.debug("RO response: %s", mano_response.text)
            content = self._parse_yaml(mano_response.text, response=True)            
            if mano_response.status_code == 200:
                return content
            else:
                raise ROClientException(str(content), http_code=mano_response.status)        
        elif action == "get" or action == "show":
            url = "{}{}/vim/{}/{}/{}".format(self.endpoint_url, tenant_text, datacenter, item, uuid)
            self.logger.debug("GET %s", url)
            mano_response = requests.get(url, headers=self.headers_req)
            self.logger.debug("RO response: %s", mano_response.text)
            content = self._parse_yaml(mano_response.text, response=True)            
            if mano_response.status_code == 200:
                return content
            else:
                raise ROClientException(str(content), http_code=mano_response.status)        
        elif action == "delete":
            url = "{}{}/vim/{}/{}/{}".format(self.endpoint_url, tenant_text, datacenter, item, uuid)
            self.logger.debug("DELETE %s", url)
            mano_response = requests.delete(url, headers=self.headers_req)
            self.logger.debug("RO response: %s", mano_response.text)
            content = self._parse_yaml(mano_response.text, response=True)            
            if mano_response.status_code == 200:
                return content
            else:
                raise ROClientException(str(content), http_code=mano_response.status)        
        elif action == "create":
            if "descriptor" in kwargs:
                if isinstance(kwargs["descriptor"], str):
                    descriptor = self._parse(kwargs["descriptor"], kwargs.get("descriptor_format"))
                else:
                    descriptor = kwargs["descriptor"]
            elif "name" in kwargs:
                descriptor = {item[:-1]: {"name": kwargs["name"]}}
            else:
                raise ROClientException("Missing descriptor")
        
            if item[:-1] not in descriptor or len(descriptor) != 1:
                raise ROClientException("Descriptor must contain only one 'tenant' field")
            if "name" in kwargs:
                descriptor[item[:-1]]['name'] = kwargs["name"]
            if "description" in kwargs:
                descriptor[item[:-1]]['description'] = kwargs["description"]
            payload_req = yaml.safe_dump(descriptor)
            # print payload_req
            url = "{}{}/vim/{}/{}".format(self.endpoint_url, tenant_text, datacenter, item)
            self.logger.debug("RO POST %s %s", url, payload_req)
            mano_response = requests.post(url, headers=self.headers_req, data=payload_req)
            self.logger.debug("RO response: %s", mano_response.text)
            content = self._parse_yaml(mano_response.text, response=True)
            if mano_response.status_code == 200:
                return content
            else:
                raise ROClientException(str(content), http_code=mano_response.status)
        else:
            raise ROClientException("Unknown value for action '{}".format(str(action)))


if __name__ == '__main__':
    RO_URL = "http://localhost:9090/openmano"
    TEST_TENANT = "myTenant"
    TEST_VIM1 = "myvim"
    TEST_URL1 = "https://localhost:5000/v1"
    TEST_TYPE1 = "openstack"
    TEST_CONFIG1 = {"use_floating_ip": True}
    TEST_VIM2 = "myvim2"
    TEST_URL2 = "https://localhost:5000/v2"
    TEST_TYPE2 = "openvim"
    TEST_CONFIG2 = {"config2": "config2", "config3": True}

    streamformat = "%(asctime)s %(name)s %(levelname)s: %(message)s"
    logging.basicConfig(format=streamformat)
    logger = logging.getLogger("ROClient")

    tenant_id = None
    vim_id = False
    loop = asyncio.get_event_loop()
    myClient = ROClient(endpoint_url=RO_URL, loop=loop, loglevel="DEBUG")
    try:
        # test tenant
        content = loop.run_until_complete(myClient.get_list("tenant"))
        print("tenants", content)
        content = loop.run_until_complete(myClient.create("tenant", name=TEST_TENANT))
        tenant_id = True
        content = loop.run_until_complete(myClient.show("tenant", TEST_TENANT))
        print("tenant", TEST_TENANT, content)
        content = loop.run_until_complete(myClient.edit("tenant", TEST_TENANT, description="another description"))
        content = loop.run_until_complete(myClient.show("tenant", TEST_TENANT))
        print("tenant edited", TEST_TENANT, content)
        myClient["tenant"] = TEST_TENANT

        # test VIM
        content = loop.run_until_complete(myClient.create("vim", name=TEST_VIM1, type=TEST_TYPE1, vim_url=TEST_URL1,
                                                          config=TEST_CONFIG1))
        vim_id = True
        content = loop.run_until_complete(myClient.get_list("vim"))
        print("vim", content)
        content = loop.run_until_complete(myClient.show("vim", TEST_VIM1))
        print("vim", TEST_VIM1, content)
        content = loop.run_until_complete(myClient.edit("vim", TEST_VIM1, description="another description",
                                                        name=TEST_VIM2, type=TEST_TYPE2, vim_url=TEST_URL2,
                                                        config=TEST_CONFIG2))
        content = loop.run_until_complete(myClient.show("vim", TEST_VIM2))
        print("vim edited", TEST_VIM2, content)

        # test VIM_ACCOUNT
        content = loop.run_until_complete(myClient.attach_datacenter(TEST_VIM2, vim_username='user',
                                                                     vim_password='pass', vim_tenant_name='vimtenant1',
                                                                     config=TEST_CONFIG1))
        vim_id = True
        content = loop.run_until_complete(myClient.get_list("vim_account"))
        print("vim_account", content)
        content = loop.run_until_complete(myClient.show("vim_account", TEST_VIM2))
        print("vim_account", TEST_VIM2, content)
        content = loop.run_until_complete(myClient.edit("vim_account", TEST_VIM2, vim_username='user2',
                                                        vim_password='pass2', vim_tenant_name="vimtenant2",
                                                        config=TEST_CONFIG2))
        content = loop.run_until_complete(myClient.show("vim_account", TEST_VIM2))
        print("vim_account edited", TEST_VIM2, content)

        myClient["vim"] = TEST_VIM2

    except Exception as e:
        logger.error("Error {}".format(e), exc_info=True)

    for item in (("vim_account", TEST_VIM1), ("vim", TEST_VIM1),
                 ("vim_account", TEST_VIM2), ("vim", TEST_VIM2),
                 ("tenant", TEST_TENANT)):
        try:
            content = loop.run_until_complete(myClient.delete(item[0], item[1]))
            print("{} {} deleted; {}".format(item[0], item[1], content))
        except Exception as e:
            if e.http_code == 404:
                print("{} {} not present or already deleted".format(item[0], item[1]))
            else:
                logger.error("Error {}".format(e), exc_info=True)

    loop.close()