Forecaster component:

## PathComp Impact

After retrieving the topology, if the service has a duration constraint configured, the PathComp component should interrogate the Forecaster and request a topology forecast according to the requested duration of the service. The computed link capacity forecast should be used as link capacity in path computations.

```

  link_capacities : Dict[str, float] = dict() # link_uuid => available_capacity_gbps

  service_duration = get_service_duration(request.service)

  if service_duration is None:

    topology = context_client.GetTopologyDetails(topology_id)

    for link in topology.links:

      link_capacities[link.link_id.uuid] = link.available_capacity_gbps

  else:

    forecast_request = ForecastTopology(

      topology_id = TopologyId(service.context_id, admin),

      forecast_window_seconds = service.duration

    )

    forecast_reply = forecaster_client.ComputeTopologyForecast(forecast_request)

    for link_capacity in forecast_reply.link_capacities:

      total_capacity_gbps = link_capacity.total_capacity_gbps

      forecast_used_capacity_gbps = link_capacity.forecast_used_capacity_gbps

      forecast_available_capacity_gbps = total_capacity_gbps - forecast_used_capacity_gbps

      link_capacities[link_capacity.link_id.uuid] = forecast_available_capacity_gbps

  # Continue path computation passing link_capacities to the path comp algorithms.

```

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