text: #!/usr/bin/env python3
  # MIT License
  #
  # Copyright (c) 2020 FABRIC Testbed
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
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  #
  # Author: Komal Thareja (kthare10@renci.org)
  from datetime import datetime, timedelta
  from typing import List, Tuple, Dict
  
  from fabric_mb.message_bus.messages.lease_reservation_avro import LeaseReservationAvro
  from fabric_mb.message_bus.messages.reservation_predecessor_avro import ReservationPredecessorAvro
  from fabric_mb.message_bus.messages.ticket_reservation_avro import TicketReservationAvro
  from fim.slivers.base_sliver import BaseSliver
  from fim.slivers.network_node import NodeSliver
  
  from fabric_cf.actor.core.apis.abc_mgmt_controller_mixin import ABCMgmtControllerMixin
  from fabric_cf.actor.core.common.constants import Constants
  from fabric_cf.actor.core.kernel.reservation_states import ReservationStates, ReservationPendingStates
  from fabric_cf.actor.core.time.actor_clock import ActorClock
  from fabric_cf.actor.core.util.id import ID
  
  
  class ReservationConverter:
      """
      Class responsible for computing reservations from slivers
      """
      def __init__(self, *, controller: ABCMgmtControllerMixin, broker: ID):
          self.controller = controller
          self.broker = broker
  
      def generate_reservation(self, *, sliver: BaseSliver, slice_id: str, end_time: datetime,
                               pred_list: List[str] = None) -> TicketReservationAvro:
          """
          Responsible to generate reservation from the sliver
          :param sliver Network Service or Network Node Sliver
          :param slice_id Slice Id
          :param end_time End Time
          :param pred_list Predecessor Reservation Id List
          :returns list of tickets
          """
          ticket = None
          if pred_list is not None:
              ticket = LeaseReservationAvro()
              ticket.redeem_processors = []
              for rid in pred_list:
                  pred = ReservationPredecessorAvro()
                  pred.set_reservation_id(value=rid)
                  ticket.redeem_processors.append(pred)
          else:
              ticket = TicketReservationAvro()
          ticket.set_slice_id(slice_id)
          ticket.set_broker(str(self.broker))
          ticket.set_units(1)
          ticket.set_resource_type(str(sliver.get_type()))
          start = datetime.utcnow()
          end = start + timedelta(hours=Constants.DEFAULT_LEASE_IN_HOURS)
          if end_time is not None:
              end = end_time
          ticket.set_start(ActorClock.to_milliseconds(when=start))
          ticket.set_end(ActorClock.to_milliseconds(when=end))
          ticket.set_state(ReservationStates.Unknown.value)
          ticket.set_pending_state(ReservationPendingStates.None_.value)
          ticket.set_sliver(sliver)
          ticket.set_reservation_id(value=str(ID()))
          return ticket
  
  