ogn-python/app/backend/liveglidernet.py

from datetime import datetime, timedelta, timezone, date

from app.model import AircraftBeacon, Device, Receiver

from app import db
from app.model import ReceiverBeacon


def utc_to_local(utc_dt):
    return utc_dt.replace(tzinfo=timezone.utc).astimezone(tz=None)


def encode(address):
    return "xx" + address


def decode(code):
    return code[2:9]


def rec(min_timestamp, min_online_timestamp):
    last_seen_query = (
        db.session.query(ReceiverBeacon).filter(ReceiverBeacon.timestamp > min_timestamp).order_by(ReceiverBeacon.receiver_id, ReceiverBeacon.timestamp).distinct(ReceiverBeacon.receiver_id)
    )

    lines = []
    lines.append('<?xml version="1.0" encoding="UTF-8"?>')
    lines.append("<markers>")
    lines.append('<m e="0"/>')
    for receiver_beacon in last_seen_query:
        if receiver_beacon.location == None or receiver_beacon.name.startswith("FNB"):
            continue
        lines.append(
            '<m a="{0}" b="{1:.7f}" c="{2:.7f}" d="{3:1d}"/>'.format(
                receiver_beacon.name, receiver_beacon.location.latitude, receiver_beacon.location.longitude, receiver_beacon.timestamp < min_online_timestamp
            )
        )

    lines.append("</markers>")
    xml = "\n".join(lines)

    return xml


def lxml(show_offline=False, lat_max=90, lat_min=-90, lon_max=180, lon_min=-180):

    timestamp_range_filter = [db.between(AircraftBeacon.timestamp, datetime(2018, 7, 31, 11, 55, 0), datetime(2018, 7, 31, 12, 5, 0))]

    last_seen_query = db.session.query(AircraftBeacon).filter(*timestamp_range_filter).order_by(AircraftBeacon.device_id, AircraftBeacon.timestamp).distinct(AircraftBeacon.device_id)
    lines = list()
    lines.append('<?xml version="1.0" encoding="UTF-8"?>')
    lines.append("<markers>")

    for aircraft_beacon in last_seen_query:
        device = aircraft_beacon.device

        code = encode(device.address)

        if device.info:
            if not device.info.tracked or not device.info.identified:
                continue

            if not device.info.competition:
                competition = device.info.registration[-2:]
            else:
                competition = device.info.competition

            if not device.info.registration:
                registration = "???"
            else:
                registration = device.info.registration

            address = device.address

        else:
            competition = ("_" + code[-2:]).lower()
            registration = code
            address = 0

        elapsed_time = datetime.utcnow() - aircraft_beacon.timestamp
        elapsed_seconds = int(elapsed_time.total_seconds())

        lines.append(
            '   <m a="{0:.7f},{1:.7f},{2},{3},{4},{5},{6},{7},{8},{9},{10},{11},{12},{13}"/>'.format(
                aircraft_beacon.location.latitude,
                aircraft_beacon.location.longitude,
                competition,
                registration,
                int(aircraft_beacon.altitude),
                utc_to_local(aircraft_beacon.timestamp).strftime("%H:%M:%S"),
                elapsed_seconds,
                int(aircraft_beacon.track),
                int(aircraft_beacon.ground_speed),
                int(aircraft_beacon.climb_rate * 10) / 10,
                aircraft_beacon.aircraft_type,
                aircraft_beacon.receiver_name,
                address,
                code,
            )
        )

    lines.append("</markers>")
    xml = "\n".join(lines)

    return xml