Seed code for OSDF placement adapter

Issue-ID: OPTFRA-46
Change-Id: Ia1e5ecae1052d0ef93d99cf560216822051c438f
Signed-off-by: Sastry Isukapalli <sastry@research.att.com>

6 files changed, 601 insertions, 0 deletions

diff --git a/optimizers/placementopt/__init__.py b/optimizers/placementopt/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/optimizers/placementopt/__init__.py
diff --git a/optimizers/placementopt/conductor/__init__.py b/optimizers/placementopt/conductor/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/optimizers/placementopt/conductor/__init__.py
diff --git a/optimizers/placementopt/conductor/api_builder.py b/optimizers/placementopt/conductor/api_builder.py
new file mode 100644
index 0000000..c0281fe
--- /dev/null
+++ b/optimizers/placementopt/conductor/api_builder.py
@@ -0,0 +1,121 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2015-2017 AT&T Intellectual Property
+#
+#   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 copy
+import json
+from osdf.utils import data_mapping
+from jinja2 import Template
+from osdf.utils.programming_utils import list_flatten, dot_notation
+import osdf.optimizers.placementopt.conductor.translation as tr
+from osdf.adapters.policy.utils import group_policies
+
+
+def conductor_api_builder(request_json, flat_policies: list, local_config, prov_status,
+                          template="templates/conductor_interface.json"):
+    """Build a SNIRO southbound API call for Conductor/Placement optimization
+    :param request_json: parameter data received from a client
+    :param flat_policies: policy data received from the policy platform (flat policies)
+    :param template: template to generate southbound API call to conductor
+    :param local_config: local configuration file with pointers for the service specific information
+    :param prov_status: provStatus retrieved from Subscriber policy
+    :return: json to be sent to Conductor/placement optimization
+    """
+    templ = Template(open(template).read())
+    gp = group_policies(flat_policies)
+    demand_vnf_name_list = []
+
+    for placementDemand in request_json['placementInfo']['demandInfo']['placementDemand']:
+        demand_vnf_name_list.append(placementDemand['resourceModuleName'])
+
+    demand_list = tr.gen_demands(request_json['placementInfo']['demandInfo'], gp['vnfPolicy'])
+    attribute_policy_list = tr.gen_attribute_policy(demand_vnf_name_list, gp['attribute'])
+    distance_to_location_policy_list = tr.gen_distance_to_location_policy(
+        demand_vnf_name_list, gp['distance_to_location'])
+    inventory_policy_list = tr.gen_inventory_group_policy(demand_vnf_name_list, gp['inventory_group'])
+    resource_instance_policy_list = tr.gen_resource_instance_policy(
+        demand_vnf_name_list, gp['instance_fit'])
+    resource_region_policy_list = tr.gen_resource_region_policy(demand_vnf_name_list, gp['region_fit'])
+    zone_policy_list = tr.gen_zone_policy(demand_vnf_name_list, gp['zone'])
+    optimization_policy_list = tr.gen_optimization_policy(demand_vnf_name_list, gp['placementOptimization'])
+    reservation_policy_list = tr.gen_reservation_policy(demand_vnf_name_list, gp['instance_reservation'])
+    conductor_policies = [attribute_policy_list, distance_to_location_policy_list, inventory_policy_list,
+                          resource_instance_policy_list, resource_region_policy_list, zone_policy_list]
+    filtered_policies = [x for x in conductor_policies if len(x) > 0]
+    policy_groups = list_flatten(filtered_policies)
+    reservation_policies = [x for x in reservation_policy_list if len(x) > 0]
+    reservation_groups = list_flatten(reservation_policies)
+    req_info = request_json['requestInfo']
+    model_name = request_json['placementInfo']['serviceModelInfo']['modelName']
+    service_type = data_mapping.get_service_type(model_name)
+    service_info = local_config.get('service_info', {}).get(service_type, {})
+    if 'orderInfo' in request_json["placementInfo"]:
+        order_info = json.loads(request_json["placementInfo"]["orderInfo"])
+    request_type = req_info.get('requestType', None)
+    subs_com_site_id = ""
+    if 'subscriberInfo' in request_json['placementInfo']: 
+        subs_com_site_id = request_json['placementInfo']['subscriberInfo'].get('subscriberCommonSiteId', "")
+    if service_type == 'vCPE':
+        data_mapping.normalize_user_params(order_info)
+        rendered_req = templ.render(
+            requestType=request_type,
+            chosenComplex=subs_com_site_id,
+            demand_list=demand_list,
+            policy_groups=policy_groups,
+            optimization_policies=optimization_policy_list,
+            name=req_info['requestId'],
+            timeout=req_info['timeout'],
+            limit=req_info['numSolutions'],
+            serviceType=service_type,
+            serviceInstance=request_json['placementInfo']['serviceInstanceId'],
+            provStatus = prov_status,
+            chosenRegion=order_info['requestParameters']['lcpCloudRegionId'],
+            json=json)
+    elif service_type == 'UNKNOWN':
+        rendered_req = templ.render(
+            requestType=request_type,
+            chosenComplex=subs_com_site_id,
+            demand_list=demand_list,
+            policy_groups=policy_groups,
+            reservation_groups=reservation_groups,
+            optimization_policies=optimization_policy_list,
+            name=req_info['requestId'],
+            timeout=req_info['timeout'],
+            limit=req_info['numSolutions'],
+            serviceType=service_type,
+            serviceInstance=request_json['placementInfo']['serviceInstanceId'],
+            provStatus = prov_status,
+            # process order data
+            bandwidth=dot_notation(order_info, service_info['bandwidth']),
+            bandwidth_unit=dot_notation(order_info, service_info['bandwidth_units']),
+            json=json)
+    json_payload = json.dumps(json.loads(rendered_req)) # need this because template's JSON is ugly!
+    return json_payload
+
+
+def retrieve_node(req_json, reference):
+    """
+    Get the child node(s) from the dot-notation [reference] and parent [req_json].
+    For placement and other requests, there are encoded JSONs inside the request or policy,
+    so we need to expand it and then do a search over the parent plus expanded JSON.
+    """
+    req_json_copy = copy.deepcopy(req_json)  # since we expand the JSON in place, we work on a copy
+    if 'orderInfo' in req_json_copy['placementInfo']:
+        req_json_copy['placementInfo']['orderInfo'] = json.loads(req_json_copy['placementInfo']['orderInfo'])
+    info = dot_notation(req_json_copy, reference)
+    return list_flatten(info) if isinstance(info, list) else info
+
diff --git a/optimizers/placementopt/conductor/conductor.py b/optimizers/placementopt/conductor/conductor.py
new file mode 100644
index 0000000..bdc7f17
--- /dev/null
+++ b/optimizers/placementopt/conductor/conductor.py
@@ -0,0 +1,186 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2015-2017 AT&T Intellectual Property
+#
+#   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.
+#
+# -------------------------------------------------------------------------
+#
+
+"""
+This application generates conductor API calls using the information received from SO and Policy platform.
+"""
+
+import json
+import time
+
+from jinja2 import Template
+from requests import RequestException
+
+from osdf.logging.osdf_logging import debug_log
+from osdf.optimizers.placementopt.conductor.api_builder import conductor_api_builder
+from osdf.utils.interfaces import RestClient
+from osdf.operation.exceptions import BusinessException
+
+
+def request(req_object, osdf_config, grouped_policies, prov_status):
+    """
+    Process a placement request from a Client (build Conductor API call, make the call, return result)
+    :param req_object: Request parameters from the client
+    :param osdf_config: Configuration specific to SNIRO application (core + deployment)
+    :param grouped_policies: policies related to placement (fetched based on request, and grouped by policy type)
+    :param prov_status: provStatus retrieved from Subscriber policy
+    :return: response from Conductor (accounting for redirects from Conductor service
+    """
+    config = osdf_config.deployment
+    local_config = osdf_config.core
+    uid, passwd = config['conductorUsername'], config['conductorPassword']
+    conductor_url = config['conductorUrl']
+    req_id = req_object['requestInfo']['requestId']
+    transaction_id = req_object['requestInfo']['transactionId']
+    headers = dict(transaction_id=transaction_id)
+
+    max_retries = config.get('conductorMaxRetries', 30)
+    ping_wait_time = config.get('conductorPingWaitTime', 60)
+
+    rc = RestClient(userid=uid, passwd=passwd, method="GET", log_func=debug_log.debug, headers=headers)
+    conductor_req_json_str = conductor_api_builder(req_object, grouped_policies, local_config, prov_status)
+    conductor_req_json = json.loads(conductor_req_json_str)
+
+    debug_log.debug("Sending first Conductor request for request_id {}".format(req_id))
+    resp, raw_resp = initial_request_to_conductor(rc, conductor_url, conductor_req_json)
+    # Very crude way of keeping track of time.
+    # We are not counting initial request time, first call back, or time for HTTP request
+    total_time, ctr = 0, 2
+    client_timeout = req_object['requestInfo']['timeout']
+    configured_timeout = max_retries * ping_wait_time
+    max_timeout = min(client_timeout, configured_timeout)
+
+    while True:  # keep requesting conductor till we get a result or we run out of time
+        if resp is not None:
+            if resp["plans"][0].get("status") in ["error"]:
+                raise RequestException(response=raw_resp, request=raw_resp.request)
+
+            if resp["plans"][0].get("status") in ["done", "not found"]:
+                if resp["plans"][0].get("recommendations"):
+                    return conductor_response_processor(resp, raw_resp, req_id)
+                else:  # "solved" but no solutions found
+                    return conductor_no_solution_processor(resp, raw_resp, req_id)
+            new_url = resp['plans'][0]['links'][0][0]['href']  # TODO: check why a list of lists
+
+        if total_time >= max_timeout:
+            raise BusinessException("Conductor could not provide a solution within {} seconds, this transaction is timing out".format(max_timeout))
+        time.sleep(ping_wait_time)
+        ctr += 1
+        debug_log.debug("Attempt number {} url {}; prior status={}".format(ctr, new_url, resp['plans'][0]['status']))
+        total_time += ping_wait_time
+
+        try:
+            raw_resp = rc.request(new_url, raw_response=True)
+            resp = raw_resp.json()
+        except RequestException as e:
+            debug_log.debug("Conductor attempt {} for request_id {} has failed because {}".format(ctr, req_id, str(e)))
+
+
+def initial_request_to_conductor(rc, conductor_url, conductor_req_json):
+    """First steps in the request-redirect chain in making a call to Conductor
+    :param rc: REST client object for calling conductor
+    :param conductor_url: conductor's base URL to submit a placement request
+    :param conductor_req_json: request json object to send to Conductor
+    :return: URL to check for follow up (similar to redirects); we keep checking these till we get a result/error
+    """
+    debug_log.debug("Payload to Conductor: {}".format(json.dumps(conductor_req_json)))
+    raw_resp = rc.request(url=conductor_url, raw_response=True, method="POST", json=conductor_req_json)
+    resp = raw_resp.json()
+    if resp["status"] != "template":
+        raise RequestException(response=raw_resp, request=raw_resp.request)
+    time.sleep(10)  # 10 seconds wait time to avoid being too quick!
+    plan_url = resp["links"][0][0]["href"]
+    debug_log.debug("Attemping to read the plan from the conductor provided url {}".format(plan_url))
+    raw_resp = rc.request(raw_response=True, url=plan_url)  # TODO: check why a list of lists for links
+    resp = raw_resp.json()
+
+    if resp["plans"][0]["status"] in ["error"]:
+        raise RequestException(response=raw_resp, request=raw_resp.request)
+    return resp, raw_resp  # now the caller of this will handle further follow-ups
+
+
+def conductor_response_processor(conductor_response, raw_response, req_id):
+    """Build a response object to be sent to client's callback URL from Conductor's response
+    This includes Conductor's placement optimization response, and required ASDC license artifacts
+
+    :param conductor_response: JSON response from Conductor
+    :param raw_response: Raw HTTP response corresponding to above
+    :param req_id: Id of a request
+    :return: JSON object that can be sent to the client's callback URL
+    """
+    composite_solutions = []
+    name_map = {"physical-location-id": "cloudClli", "host_id": "vnfHostName",
+                "cloud_version": "cloudVersion", "cloud_owner": "cloudOwner"}
+    for reco in conductor_response['plans'][0]['recommendations']:
+        for resource in reco.keys():
+            c = reco[resource]['candidate']
+            solution = {
+                'resourceModuleName': resource,
+                'serviceResourceId': reco[resource]['service_resource_id'],
+                'inventoryType': c['inventory_type'],
+                'serviceInstanceId': c['candidate_id'] if c['inventory_type'] == "service" else "",
+                'cloudRegionId': c['location_id'],
+                'assignmentInfo': []
+            }
+
+            for key, value in reco[resource]['attributes'].items():
+                try:
+                    solution['assignmentInfo'].append({"variableName": name_map[key], "variableValue": value})
+                except KeyError:
+                    debug_log.debug("The key[{}] is not mapped and will not be returned in assignment info".format(key))
+
+            if c.get('host_id'):
+                solution['assignmentInfo'].append({'variableName': name_map['host_id'], 'variableValue': c['host_id']})
+            composite_solutions.append(solution)
+
+    request_state = conductor_response['plans'][0]['status']
+    transaction_id = raw_response.headers.get('transaction_id', "")
+    status_message = conductor_response.get('plans')[0].get('message', "")
+
+    solution_info = {}
+    if composite_solutions:
+        solution_info['placementInfo'] = composite_solutions
+
+    resp = {
+        "transactionId": transaction_id,
+        "requestId": req_id,
+        "requestState": request_state,
+        "statusMessage": status_message,
+        "solutionInfo": solution_info
+    }
+    return resp
+
+
+def conductor_no_solution_processor(conductor_response, raw_response, request_id,
+                                    template_placement_response="templates/plc_opt_response.jsont"):
+    """Build a response object to be sent to client's callback URL from Conductor's response
+    This is for case where no solution is found
+
+    :param conductor_response: JSON response from Conductor
+    :param raw_response: Raw HTTP response corresponding to above
+    :param request_id: request Id associated with the client request (same as conductor response's "name")
+    :param template_placement_response: the template for generating response to client (plc_opt_response.jsont)
+    :return: JSON object that can be sent to the client's callback URL
+    """
+    status_message = conductor_response["plans"][0].get("message")
+    templ = Template(open(template_placement_response).read())
+    return json.loads(templ.render(composite_solutions=[], requestId=request_id,
+                                   transactionId=raw_response.headers.get('transaction_id', ""),
+                                   statusMessage=status_message, json=json))
+
+
diff --git a/optimizers/placementopt/conductor/remote_opt_processor.py b/optimizers/placementopt/conductor/remote_opt_processor.py
new file mode 100644
index 0000000..f753a70
--- /dev/null
+++ b/optimizers/placementopt/conductor/remote_opt_processor.py
@@ -0,0 +1,79 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2015-2017 AT&T Intellectual Property
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# -------------------------------------------------------------------------
+#
+
+from requests import RequestException
+
+import traceback
+from osdf.operation.error_handling import build_json_error_body
+from osdf.logging.osdf_logging import metrics_log, MH, error_log
+from osdf.optimizers.placementopt.conductor import conductor
+from osdf.optimizers.licenseopt.simple_license_allocation import license_optim
+from osdf.utils.interfaces import get_rest_client
+
+
+def process_placement_opt(request_json, policies, osdf_config, prov_status):
+    """Perform the work for placement optimization (e.g. call SDC artifact and make conductor request)
+    NOTE: there is scope to make the requests to policy asynchronous to speed up overall performance
+    :param request_json: json content from original request
+    :param policies: flattened policies corresponding to this request
+    :param osdf_config: configuration specific to OSDF app
+    :param prov_status: provStatus retrieved from Subscriber policy
+    :return: None, but make a POST to callback URL
+    """
+    
+    try:
+        rc = get_rest_client(request_json, service="so")
+        req_id = request_json["requestInfo"]["requestId"]
+        transaction_id = request_json['requestInfo']['transactionId']
+
+        metrics_log.info(MH.inside_worker_thread(req_id))
+        license_info = None
+        if 'licenseDemand' in request_json['placementInfo']['demandInfo']:
+            license_info = license_optim(request_json)
+
+        # Conductor only handles placement, only call Conductor if placementDemands exist
+        if 'placementDemand' in request_json['placementInfo']['demandInfo']:
+            metrics_log.info(MH.requesting("placement/conductor", req_id))
+            placement_response = conductor.request(request_json, osdf_config, policies, prov_status)
+            if license_info:  # Attach license solution if it exists
+                placement_response['solutionInfo']['licenseInfo'] = license_info
+        else:  # License selection only scenario
+            placement_response = {
+                "transactionId": transaction_id,
+                "requestId": req_id,
+                "requestState": "complete",
+                "statusMessage": "License selection completed successfully",
+                "solutionInfo": {"licenseInfo": license_info}
+            }
+    except Exception as err:
+        error_log.error("Error for {} {}".format(req_id, traceback.format_exc()))
+
+        try:
+            body = build_json_error_body(err)
+            metrics_log.info(MH.sending_response(req_id, "ERROR"))
+            rc.request(json=body, noresponse=True)
+        except RequestException:
+            error_log.error("Error sending asynchronous notification for {} {}".format(req_id, traceback.format_exc()))
+        return
+
+    try:
+        metrics_log.info(MH.calling_back_with_body(req_id, rc.url,placement_response))
+        rc.request(json=placement_response, noresponse=True)
+    except RequestException :  # can't do much here but log it and move on
+        error_log.error("Error sending asynchronous notification for {} {}".format(req_id, traceback.format_exc()))
+
diff --git a/optimizers/placementopt/conductor/translation.py b/optimizers/placementopt/conductor/translation.py
new file mode 100644
index 0000000..036398a
--- /dev/null
+++ b/optimizers/placementopt/conductor/translation.py
@@ -0,0 +1,215 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2015-2017 AT&T Intellectual Property
+#
+#   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 json
+from osdf.utils.data_conversion import text_to_symbol
+from osdf.utils import data_mapping
+
+def gen_optimization_policy(vnf_list, optimization_policy):
+    """Generate optimization policy details to pass to Conductor
+    :param vnf_list: List of vnf's to used in placement request
+    :param optimization_policy: optimization policy information provided in the incoming request
+    :return: List of optimization policies in a format required by Conductor
+    """
+    optimization_policy_list = []
+    for policy in optimization_policy:
+        content = policy['content']
+        parameter_list = []
+
+        for attr in content['objectiveParameter']['parameterAttributes']:
+            parameter = attr['parameter'] if attr['parameter'] == "cloud_version" else attr['parameter']+"_between"
+            for res in attr['resource']:
+                vnf = get_matching_vnf(res, vnf_list)
+                value = [vnf] if attr['parameter'] == "cloud_version" else [attr['customerLocationInfo'], vnf]
+                parameter_list.append({
+                    attr['operator']: [attr['weight'], {parameter: value}]
+                })
+
+        optimization_policy_list.append({
+                content['objective']: {content['objectiveParameter']['operator']: parameter_list }
+        })
+    return optimization_policy_list
+
+
+def get_matching_vnf(resource, vnf_list):
+    
+    for vnf in vnf_list:
+        if resource in vnf:
+            return vnf
+    return resource
+
+
+def get_matching_vnfs(resources, vnf_list, match_type="intersection"):
+    """Get a list of matching VNFs from the list of resources
+    :param resources:
+    :param vnf_list: List of vnf's to used in placement request
+    :param match_type: "intersection" or "all" or "any" (any => send all_vnfs if there is any intersection)
+    :return: List of matching VNFs
+    """
+    common_vnfs = []
+    for vnf in vnf_list:
+        for resource in resources:
+            if resource in vnf:
+                common_vnfs.append(vnf)
+    if match_type == "intersection":  # specifically requested intersection
+        return common_vnfs
+    elif common_vnfs or match_type == "all":  # ("any" and common) OR "all"
+        return resources
+    return None
+
+
+def gen_policy_instance(vnf_list, resource_policy, match_type="intersection", rtype=None):
+    """Generate a list of policies
+    :param vnf_list: List of vnf's to used in placement request
+    :param resource_policy: policy for this specific resource
+    :param match_type: How to match the vnf_names with the vnf_list (intersection or "any")
+             intersection => return intersection; "any" implies return all vnf_names if intersection is not null
+    :param rtype: resource type (e.g. resourceRegionProperty or resourceInstanceProperty)
+             None => no controller information added to the policy specification to Conductor
+    :return: resource policy list in a format required by Conductor
+    """
+    resource_policy_list = []
+    related_policies = []
+    for policy in resource_policy:
+        pc = policy['content']
+        demands = get_matching_vnfs(pc['resourceInstanceType'], vnf_list, match_type=match_type)
+        resource = {pc['identity']: {'type': pc['type'], 'demands': demands}}
+
+        if rtype:
+            resource[pc['identity']]['properties'] = {'controller': pc[rtype]['controller'],
+                                                      'request': json.loads(pc[rtype]['request'])}
+        if demands and len(demands) != 0:
+            resource_policy_list.append(resource)
+            related_policies.append(policy)
+    return resource_policy_list, related_policies
+
+
+def gen_resource_instance_policy(vnf_list, resource_instance_policy):
+    """Get policies governing resource instances in order to populate the Conductor API call"""
+    cur_policies, _ = gen_policy_instance(vnf_list, resource_instance_policy, rtype='resourceInstanceProperty')
+    return cur_policies
+
+
+def gen_resource_region_policy(vnf_list, resource_region_policy):
+    """Get policies governing resource region in order to populate the Conductor API call"""
+    cur_policies, _ = gen_policy_instance(vnf_list, resource_region_policy, rtype='resourceRegionProperty')
+    return cur_policies
+
+
+def gen_inventory_group_policy(vnf_list, inventory_group_policy):
+    """Get policies governing inventory group in order to populate the Conductor API call"""
+    cur_policies, _ = gen_policy_instance(vnf_list, inventory_group_policy, rtype=None)
+    return cur_policies
+
+
+def gen_reservation_policy(vnf_list, reservation_policy):
+    """Get policies governing resource instances in order to populate the Conductor API call"""
+    cur_policies, _ = gen_policy_instance(vnf_list, reservation_policy, rtype='instanceReservationProperty')
+    return cur_policies
+
+
+def gen_distance_to_location_policy(vnf_list, distance_to_location_policy):
+    """Get policies governing distance-to-location for VNFs in order to populate the Conductor API call"""
+    cur_policies, related_policies = gen_policy_instance(vnf_list, distance_to_location_policy, rtype=None)
+    for p_new, p_main in zip(cur_policies, related_policies):  # add additional fields to each policy
+        properties = p_main['content']['distanceToLocationProperty']
+        pcp_d = properties['distanceCondition']
+        p_new[p_main['content']['identity']]['properties'] = {
+            'distance': text_to_symbol[pcp_d['operator']] + " " + pcp_d['value'].lower(),
+            'location': properties['locationInfo']
+        }
+    return cur_policies
+
+
+def gen_attribute_policy(vnf_list, attribute_policy):
+    """Get policies governing attributes of VNFs in order to populate the Conductor API call"""
+    cur_policies, related_policies = gen_policy_instance(vnf_list, attribute_policy, rtype=None)
+    for p_new, p_main in zip(cur_policies, related_policies):  # add additional fields to each policy
+        properties = p_main['content']['cloudAttributeProperty']
+        p_new[p_main['content']['identity']]['properties'] = {
+            'evaluate': {
+                'hypervisor': properties.get('hypervisor', ''),
+                'cloud_version': properties.get('cloudVersion', ''),
+                'cloud_type': properties.get('cloudType', ''),
+                'dataplane': properties.get('dataPlane', ''),
+                'network_roles': properties.get('networkRoles', ''),
+                'complex': properties.get('complex', ''),
+                'state': properties.get('state', ''),
+                'country': properties.get('country', ''),
+                'geo_region': properties.get('geoRegion', ''),
+                'exclusivity_groups': properties.get('exclusivityGroups', ''),
+                'replication_role': properties.get('replicationRole', '')
+            }
+        }
+    return cur_policies
+
+
+def gen_zone_policy(vnf_list, zone_policy):
+    """Get zone policies in order to populate the Conductor API call"""
+    cur_policies, related_policies = gen_policy_instance(vnf_list, zone_policy, rtype=None)
+    for p_new, p_main in zip(cur_policies, related_policies):  # add additional fields to each policy
+        pmz = p_main['content']['zoneProperty']
+        p_new[p_main['content']['identity']]['properties'] = {'category': pmz['category'], 'qualifier': pmz['qualifier']}
+    return cur_policies
+
+
+def get_demand_properties(demand, policies):
+    """Get list demand properties objects (named tuples) from policy"""
+    def _get_candidates(candidate_info):
+        return [dict(inventory_type=x['candidateType'], candidate_id=x['candidates']) for x in candidate_info]
+    properties = []
+    for policy in policies:
+        for resourceInstanceType in policy['content']['resourceInstanceType']:
+            if resourceInstanceType in demand['resourceModuleName']:
+                for x in policy['content']['property']:
+                    property = dict(inventory_provider=x['inventoryProvider'], 
+                                    inventory_type=x['inventoryType'],
+                                    service_resource_id=demand['serviceResourceId'])
+                    if 'attributes' in x:
+                        attributes = {}
+                        for k,v in x['attributes'].items():
+                            key=data_mapping.convert(k)
+                            attributes[key] = v
+                            if(key=="model-invariant-id"):
+                                attributes[key]=demand['resourceModelInfo']['modelInvariantId']
+                            elif(key=="model-version-id"):
+                                attributes[key]=demand['resourceModelInfo']['modelVersionId']
+                        property.update({"attributes": attributes})
+                    if x['inventoryType'] == "cloud":
+                        property['region'] = {'get_param': "CHOSEN_REGION"}
+                    if 'exclusionCandidateInfo' in demand:
+                        property['excluded_candidates'] = _get_candidates(demand['exclusionCandidateInfo'])
+                    if 'requiredCandidateInfo' in demand:
+                        property['required_candidates'] = _get_candidates(demand['requiredCandidateInfo'])
+                    properties.append(property)
+    if len(properties) == 0:
+        properties.append(dict(customer_id="", service_type="", inventory_provider="", inventory_type=""))
+    return properties
+
+
+def gen_demands(req_json, vnf_policies):
+    """Generate list of demands based on request and VNF policies
+    :param req_json: Request object from the client (e.g. MSO)
+    :param vnf_policies: Policies associated with demand resources (e.g. from grouped_policies['vnfPolicy'])
+    :return: list of demand parameters to populate the Conductor API call
+    """
+    demand_dictionary = {}
+    for placementDemand in req_json['placementDemand']:
+        demand_dictionary.update({placementDemand['resourceModuleName']: get_demand_properties(placementDemand, vnf_policies)})
+
+    return demand_dictionary