60 lines
2.4 KiB
Python
60 lines
2.4 KiB
Python
import datetime, time, calendar
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from trackdirect.repositories.PacketRepository import PacketRepository
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from trackdirect.websocket.queries.MissingPacketsQuery import MissingPacketsQuery
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class MostRecentPacketsQuery() :
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"""This query class returnes the latest packet for moving stations and the latest packet for every uniqe position for stationary stations.
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Note:
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If no packet are found we will simulate them
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"""
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def __init__(self, state, db) :
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"""The __init__ method.
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Args:
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state (WebsocketConnectionState): The current state for a websocket connection
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db (psycopg2.Connection): Database connection
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"""
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self.state = state
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self.db = db
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self.packetRepository = PacketRepository(db)
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self.simulateEmptyStation = False
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def enableSimulateEmptyStation(self) :
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"""Enable simulation even if we have no packet from station at all
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"""
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self.simulateEmptyStation = True
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def getPackets(self, stationIds) :
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"""Fetch the most recent packets for the specified stations.
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Returns the latest packet for moving stations and the latest packet for every uniqe position for stationary stations.
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Args:
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stationIds (array): An array of all stations we want packets for
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Returns:
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array
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"""
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if (self.state.latestTimeTravelRequest is not None) :
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timestamp = int(self.state.latestTimeTravelRequest) - (int(self.state.latestMinutesRequest)*60)
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packets = self.packetRepository.getMostRecentConfirmedObjectListByStationIdListAndTimeInterval(stationIds, timestamp, self.state.latestTimeTravelRequest)
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else :
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timestamp = int(time.time()) - (int(self.state.latestMinutesRequest)*60)
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packets = self.packetRepository.getMostRecentConfirmedObjectListByStationIdList(stationIds, timestamp)
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if (len(packets) < len(stationIds)) :
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# If we have no recent markers we just send the latest that we have
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query = MissingPacketsQuery(self.state, self.db)
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if (self.simulateEmptyStation) :
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query.enableSimulateEmptyStation()
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foundMissingPackets = query.getMissingPackets(stationIds, packets)
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if (foundMissingPackets) :
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foundMissingPackets.extend(packets)
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packets = foundMissingPackets
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return packets
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