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# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (https://tfs.etsi.org/)
#
# 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 math
from typing import Dict, Optional
from common.Constants import DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME, ServiceNameEnum
from common.Settings import ENVVAR_SUFIX_SERVICE_HOST, ENVVAR_SUFIX_SERVICE_PORT_GRPC, find_environment_variables, get_env_var_name
from common.method_wrappers.ServiceExceptions import InvalidArgumentException
from common.proto.context_pb2 import Constraint_Schedule, Service, TopologyDetails
from common.proto.forecaster_pb2 import ForecastLinkCapacityReply, ForecastTopologyCapacityRequest
from common.proto.pathcomp_pb2 import PathCompRequest
from common.tools.context_queries.Topology import get_topology_details
from common.tools.grpc.Tools import grpc_message_to_json_string
from context.client.ContextClient import ContextClient
from forecaster.client.ForecasterClient import ForecasterClient
def get_service_schedule(service : Service) -> Optional[Constraint_Schedule]:
for constraint in service.service_constraints:
if constraint.WhichOneof('constraint') != 'schedule': continue
return constraint.schedule
return None
def get_pathcomp_topology_details(request : PathCompRequest, allow_forecasting : bool = False) -> TopologyDetails:
context_client = ContextClient()
topology_details = get_topology_details(
context_client, DEFAULT_TOPOLOGY_NAME, context_uuid=DEFAULT_CONTEXT_NAME, rw_copy=True
)
if len(request.services) == 0:
raise InvalidArgumentException('services', grpc_message_to_json_string(request), 'must not be empty')
if len(request.services) > 1:
# Forecaster does not support multiple services
return topology_details
if not allow_forecasting:
# Forecaster explicitly disabled
return topology_details
env_vars = find_environment_variables([
get_env_var_name(ServiceNameEnum.FORECASTER, ENVVAR_SUFIX_SERVICE_HOST ),
get_env_var_name(ServiceNameEnum.FORECASTER, ENVVAR_SUFIX_SERVICE_PORT_GRPC),
])
if len(env_vars) != 2:
# Forecaster not available
return topology_details
service = request.services[0]
service_schedule = get_service_schedule(service)
if service_schedule is None:
# Service provides no schedule constraint, so forecast cannot be computed
return topology_details
#start_timestamp = service_schedule.start_timestamp
duration_days = service_schedule.duration_days
if float(duration_days) > 0.0:
# Service provides no scheduled duration, so forecast cannot be computed
return topology_details
forecaster_client = ForecasterClient()
forecaster_client.connect()
forecast_request = ForecastTopologyCapacityRequest(
topology_id=topology_details.topology_id,
forecast_window_seconds = duration_days * 24 * 60 * 60
)
forecast_reply = forecaster_client.ForecastTopologyCapacity(forecast_request)
forecasted_link_capacities : Dict[str, ForecastLinkCapacityReply] = {
link_capacity.link_id.link_uuid.uuid : link_capacity
for link_capacity in forecast_reply.link_capacities
}
for link in topology_details.links:
link_uuid = link.link_id.link_uuid.uuid
forecasted_link_capacity = forecasted_link_capacities.get(link_uuid)
if forecasted_link_capacity is None: continue
link.attributes.used_capacity_gbps = forecasted_link_capacity.forecast_used_capacity_gbps
if link.attributes.total_capacity_gbps < link.attributes.used_capacity_gbps:
total_capacity_gbps = link.attributes.used_capacity_gbps
total_capacity_gbps = math.ceil(total_capacity_gbps / 100) * 100 # round up in steps of 100
link.attributes.total_capacity_gbps = total_capacity_gbps
return topology_details