diff --git a/src/pathcomp/frontend/Config.py b/src/pathcomp/frontend/Config.py
index 714eb7278074ac860caa76dc3ed8b4a40ae9f192..61aa31a8316a67cdba4b214fc0a1ff4b3843b003 100644
--- a/src/pathcomp/frontend/Config.py
+++ b/src/pathcomp/frontend/Config.py
@@ -13,6 +13,7 @@
# limitations under the License.
import os
+from common.Settings import get_setting
DEFAULT_PATHCOMP_BACKEND_SCHEME = 'http'
DEFAULT_PATHCOMP_BACKEND_HOST = '127.0.0.1'
@@ -37,3 +38,13 @@ PATHCOMP_BACKEND_PORT = int(os.environ.get('PATHCOMP_BACKEND_PORT', backend_port
BACKEND_URL = '{:s}://{:s}:{:d}{:s}'.format(
PATHCOMP_BACKEND_SCHEME, PATHCOMP_BACKEND_HOST, PATHCOMP_BACKEND_PORT, PATHCOMP_BACKEND_BASEURL)
+
+
+SETTING_NAME_ENABLE_FORECASTER = 'ENABLE_FORECASTER'
+TRUE_VALUES = {'Y', 'YES', 'TRUE', 'T', 'E', 'ENABLE', 'ENABLED'}
+
+def is_forecaster_enabled() -> bool:
+ is_enabled = get_setting(SETTING_NAME_ENABLE_FORECASTER, default=None)
+ if is_enabled is None: return False
+ str_is_enabled = str(is_enabled).upper()
+ return str_is_enabled in TRUE_VALUES
diff --git a/src/pathcomp/frontend/service/PathCompServiceServicerImpl.py b/src/pathcomp/frontend/service/PathCompServiceServicerImpl.py
index 784a09e32c2dbb6f6cfcbbbe51048e49ad9a7005..5d3d352d7ddf0638b3d9a3894eb1f9ac3f91c4fb 100644
--- a/src/pathcomp/frontend/service/PathCompServiceServicerImpl.py
+++ b/src/pathcomp/frontend/service/PathCompServiceServicerImpl.py
@@ -13,18 +13,20 @@
# limitations under the License.
import grpc, logging, threading
-from common.Constants import DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME, INTERDOMAIN_TOPOLOGY_NAME
+#from common.Constants import DEFAULT_CONTEXT_NAME, DEFAULT_TOPOLOGY_NAME, INTERDOMAIN_TOPOLOGY_NAME
from common.method_wrappers.Decorator import MetricsPool, safe_and_metered_rpc_method
-from common.proto.context_pb2 import ContextId, Empty, TopologyId
+#from common.proto.context_pb2 import ContextId, Empty, TopologyId
from common.proto.pathcomp_pb2 import PathCompReply, PathCompRequest
from common.proto.pathcomp_pb2_grpc import PathCompServiceServicer
-from common.tools.context_queries.Device import get_devices_in_topology
-from common.tools.context_queries.Link import get_links_in_topology
-from common.tools.context_queries.InterDomain import is_inter_domain
+#from common.tools.context_queries.Device import get_devices_in_topology
+#from common.tools.context_queries.Link import get_links_in_topology
+#from common.tools.context_queries.InterDomain import is_inter_domain
from common.tools.grpc.Tools import grpc_message_to_json_string
-from common.tools.object_factory.Context import json_context_id
-from common.tools.object_factory.Topology import json_topology_id
-from context.client.ContextClient import ContextClient
+from pathcomp.frontend.Config import is_forecaster_enabled
+#from common.tools.object_factory.Context import json_context_id
+#from common.tools.object_factory.Topology import json_topology_id
+#from context.client.ContextClient import ContextClient
+from pathcomp.frontend.service.TopologyTools import get_pathcomp_topology_details
from pathcomp.frontend.service.algorithms.Factory import get_algorithm
LOGGER = logging.getLogger(__name__)
@@ -43,9 +45,7 @@ class PathCompServiceServicerImpl(PathCompServiceServicer):
def Compute(self, request : PathCompRequest, context : grpc.ServicerContext) -> PathCompReply:
LOGGER.debug('[Compute] begin ; request = {:s}'.format(grpc_message_to_json_string(request)))
- context_client = ContextClient()
-
- context_id = json_context_id(DEFAULT_CONTEXT_NAME)
+ #context_client = ContextClient()
# TODO: improve definition of topologies; for interdomain the current topology design might be not convenient
#if (len(request.services) == 1) and is_inter_domain(context_client, request.services[0].service_endpoint_ids):
# #devices = get_devices_in_topology(context_client, ADMIN_CONTEXT_ID, INTERDOMAIN_TOPOLOGY_NAME)
@@ -56,10 +56,11 @@ class PathCompServiceServicerImpl(PathCompServiceServicer):
# # TODO: add contexts, topologies, and membership of devices/links in topologies
# #devices = context_client.ListDevices(Empty())
# #links = context_client.ListLinks(Empty())
+ # context_id = json_context_id(DEFAULT_CONTEXT_NAME)
# topology_id = json_topology_id(DEFAULT_TOPOLOGY_NAME, context_id)
- topology_id = json_topology_id(DEFAULT_TOPOLOGY_NAME, context_id)
- topology_details = context_client.GetTopologyDetails(TopologyId(**topology_id))
+ allow_forecasting = is_forecaster_enabled()
+ topology_details = get_pathcomp_topology_details(request, allow_forecasting=allow_forecasting)
algorithm = get_algorithm(request)
algorithm.add_devices(topology_details.devices)
diff --git a/src/pathcomp/frontend/service/TopologyTools.py b/src/pathcomp/frontend/service/TopologyTools.py
new file mode 100644
index 0000000000000000000000000000000000000000..b66fa13dd32731a0611c7683b858be2019cdb480
--- /dev/null
+++ b/src/pathcomp/frontend/service/TopologyTools.py
@@ -0,0 +1,96 @@
+# 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
diff --git a/src/pathcomp/frontend/service/algorithms/tools/ComposeRequest.py b/src/pathcomp/frontend/service/algorithms/tools/ComposeRequest.py
index e2c6dc13804703d89242b27156763ce887aa4884..02765901ec1084e32fde440ff531f035249fc750 100644
--- a/src/pathcomp/frontend/service/algorithms/tools/ComposeRequest.py
+++ b/src/pathcomp/frontend/service/algorithms/tools/ComposeRequest.py
@@ -118,9 +118,25 @@ def compose_link(grpc_link : Link) -> Dict:
for link_endpoint_id in grpc_link.link_endpoint_ids
]
+ total_capacity_gbps, used_capacity_gbps = None, None
+ if grpc_link.HasField('attributes'):
+ attributes = grpc_link.attributes
+ # In proto3, HasField() does not work for scalar fields, using ListFields() instead.
+ attribute_names = set([field.name for field,_ in attributes.ListFields()])
+ if 'total_capacity_gbps' in attribute_names:
+ total_capacity_gbps = attributes.total_capacity_gbps
+ if 'used_capacity_gbps' in attribute_names:
+ used_capacity_gbps = attributes.used_capacity_gbps
+ elif total_capacity_gbps is not None:
+ used_capacity_gbps = total_capacity_gbps
+
+ if total_capacity_gbps is None: total_capacity_gbps = 100
+ if used_capacity_gbps is None: used_capacity_gbps = 0
+ available_capacity_gbps = total_capacity_gbps - used_capacity_gbps
+
forwarding_direction = LinkForwardingDirection.UNIDIRECTIONAL.value
- total_potential_capacity = compose_capacity(200, CapacityUnit.MBPS.value)
- available_capacity = compose_capacity(200, CapacityUnit.MBPS.value)
+ total_potential_capacity = compose_capacity(total_capacity_gbps, CapacityUnit.GBPS.value)
+ available_capacity = compose_capacity(available_capacity_gbps, CapacityUnit.GBPS.value)
cost_characteristics = compose_cost_characteristics('linkcost', '1', '0')
latency_characteristics = compose_latency_characteristics('1')