403 lines
14 KiB
Python
403 lines
14 KiB
Python
import requests
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import logging
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import math
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import random
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from datetime import datetime, timedelta
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import ephem
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import lxml
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import settings
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from tqdm import tqdm
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import os
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import sys
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def get_paginated_endpoint(url, max_entries=None):
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r = requests.get(url=url)
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r.raise_for_status()
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data = r.json()
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while 'next' in r.links and (not max_entries or len(data) < max_entries):
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next_page_url = r.links['next']['url']
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r = requests.get(url=next_page_url)
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r.raise_for_status()
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data.extend(r.json())
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return data
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def read_priorities_transmitters(filename):
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# Priorities and favorite transmitters
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# read the following format
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# 43017 1. KgazZMKEa74VnquqXLwAvD
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if filename is not None and os.path.exists(filename):
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with open(filename, "r") as fp:
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satprio = {}
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sattrans = {}
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lines = fp.readlines()
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for line in lines:
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if line[0]=="#":
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continue
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parts = line.strip().split(" ")
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sat = parts[0]
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prio = parts[1]
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transmitter = parts[2]
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satprio[sat] = float(prio)
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sattrans[sat] = transmitter
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return (satprio, sattrans)
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else:
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return ({}, {})
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def get_satellite_info():
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# Open session
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logging.info("Fetching satellite information from DB.")
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r = requests.get('{}/api/satellites'.format(settings.DB_BASE_URL))
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logging.info("Satellites received!")
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# Select alive satellites
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norad_cat_ids = []
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for o in r.json():
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if o["status"] == "alive":
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norad_cat_ids.append(o["norad_cat_id"])
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return norad_cat_ids
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def get_active_transmitter_info(fmin, fmax):
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# Open session
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logging.info("Fetching transmitter information from DB.")
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r = requests.get('{}/api/transmitters'.format(settings.DB_BASE_URL))
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logging.info("Transmitters received!")
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# Loop
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transmitters = []
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for o in r.json():
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if o["downlink_low"]:
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if o["status"] == "active" and o["downlink_low"] > fmin and o["downlink_low"] <= fmax:
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transmitter = {"norad_cat_id": o["norad_cat_id"], "uuid": o["uuid"], "mode": o["mode"]}
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transmitters.append(transmitter)
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logging.info("Transmitters filtered based on ground station capability.")
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return transmitters
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def get_transmitter_stats():
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logging.debug("Requesting transmitter success rates for all satellite")
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transmitters = get_paginated_endpoint('{}/api/transmitters/'.format(settings.NETWORK_BASE_URL))
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return transmitters
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def get_scheduled_passes_from_network(ground_station, tmin, tmax):
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# Get first page
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client = requests.session()
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# Loop
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start = True
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scheduledpasses = []
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logging.info("Requesting scheduled passes for ground station %d" % ground_station)
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# Fetch observations until the time of the end of the last fetched observation happends to be
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# before the start time of the selected timerange for scheduling
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# NOTE: This algorithm is based on the order in which the API returns the observations, i.e.
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# most recent observations are returned at first!
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while True:
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if start:
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r = client.get('{}/api/observations/?ground_station={:d}'.format(
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settings.NETWORK_BASE_URL, ground_station))
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start = False
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else:
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nextpage = r.links.get("next")
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r = client.get(nextpage["url"])
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if not r.json():
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# Ground station has no observations yet
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break
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# r.json() is a list of dicts/observations
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for o in r.json():
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satpass = {
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"id": o['norad_cat_id'],
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"tr": datetime.strptime(o['start'].replace("Z", ""), "%Y-%m-%dT%H:%M:%S"),
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"ts": datetime.strptime(o['end'].replace("Z", ""), "%Y-%m-%dT%H:%M:%S"),
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"scheduled": True,
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"altt": o['max_altitude'],
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"priority": 1,
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"uuid": o['transmitter'],
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"name": '',
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"mode": ''
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}
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if satpass['ts'] > tmin and satpass['tr'] < tmax:
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# Only store observations which are during the ROI for scheduling
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scheduledpasses.append(satpass)
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if satpass['ts'] < tmin:
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# Last fetched observation is older than the ROI for scheduling, end loop.
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break
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logging.info("Scheduled passes for ground station %d retrieved!" % ground_station)
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return scheduledpasses
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def overlap(satpass, scheduledpasses, wait_time_seconds):
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"""Check if this pass overlaps with already scheduled passes"""
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# No overlap
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overlap = False
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# Add wait time
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tr = satpass['tr']
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ts = satpass['ts'] + timedelta(seconds=wait_time_seconds)
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# Loop over scheduled passes
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for scheduledpass in scheduledpasses:
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# Test pass falls within scheduled pass
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if tr >= scheduledpass['tr'] and ts < scheduledpass['ts'] + timedelta(
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seconds=wait_time_seconds):
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overlap = True
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# Scheduled pass falls within test pass
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elif scheduledpass['tr'] >= tr and scheduledpass['ts'] + timedelta(
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seconds=wait_time_seconds) < ts:
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overlap = True
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# Pass start falls within pass
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elif tr >= scheduledpass['tr'] and tr < scheduledpass['ts'] + timedelta(
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seconds=wait_time_seconds):
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overlap = True
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# Pass end falls within end
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elif ts >= scheduledpass['tr'] and ts < scheduledpass['ts'] + timedelta(
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seconds=wait_time_seconds):
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overlap = True
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if overlap:
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break
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return overlap
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def ordered_scheduler(passes, scheduledpasses, wait_time_seconds):
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"""Loop through a list of ordered passes and schedule each next one that fits"""
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# Loop over passes
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for satpass in passes:
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# Schedule if there is no overlap with already scheduled passes
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if not overlap(satpass, scheduledpasses, wait_time_seconds):
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scheduledpasses.append(satpass)
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return scheduledpasses
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def random_scheduler(passes, scheduledpasses, wait_time_seconds):
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"""Schedule passes based on random ordering"""
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# Shuffle passes
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random.shuffle(passes)
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return ordered_scheduler(passes, scheduledpasses, wait_time_seconds)
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def report_efficiency(scheduledpasses, passes):
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if scheduledpasses:
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# Loop over passes
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start = False
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for satpass in scheduledpasses:
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if not start:
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dt = satpass['ts'] - satpass['tr']
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tmin = satpass['tr']
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tmax = satpass['ts']
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start = True
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else:
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dt += satpass['ts'] - satpass['tr']
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if satpass['tr'] < tmin:
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tmin = satpass['tr']
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if satpass['ts'] > tmax:
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tmax = satpass['ts']
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# Total time covered
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dttot = tmax - tmin
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logging.info("%d passes selected out of %d, %.0f s out of %.0f s at %.3f%% efficiency" %
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(len(scheduledpasses), len(passes), dt.total_seconds(), dttot.total_seconds(),
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100 * dt.total_seconds() / dttot.total_seconds()))
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else:
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logging.info("No appropriate passes found for scheduling.")
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def find_passes(satellites, observer, tmin, tmax, minimum_altitude, min_pass_duration):
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# Loop over satellites
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passes = []
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passid = 0
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logging.info('Finding all passes for %s satellites:' % len(satellites))
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for satellite in tqdm(satellites):
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# Set start time
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observer.date = ephem.date(tmin)
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# Load TLE
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try:
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sat_ephem = ephem.readtle(str(satellite.tle0), str(satellite.tle1), str(satellite.tle2))
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except (ValueError, AttributeError):
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continue
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# Loop over passes
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keep_digging = True
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while keep_digging:
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sat_ephem.compute(observer)
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try:
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tr, azr, tt, altt, ts, azs = observer.next_pass(sat_ephem)
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except ValueError:
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break # there will be sats in our list that fall below horizon, skip
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except TypeError:
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break # if there happens to be a non-EarthSatellite object in the list
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except Exception:
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break
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if tr is None:
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break
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# using the angles module convert the sexagesimal degree into
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# something more easily read by a human
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try:
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elevation = format(math.degrees(altt), '.0f')
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azimuth_r = format(math.degrees(azr), '.0f')
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azimuth_s = format(math.degrees(azs), '.0f')
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except TypeError:
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break
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passid += 1
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pass_duration = ts.datetime() - tr.datetime()
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# show only if >= configured horizon and till tmax,
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# and not directly overhead (tr < ts see issue 199)
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if tr < ephem.date(tmax):
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if (float(elevation) >= minimum_altitude and tr < ts and
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pass_duration > timedelta(minutes=min_pass_duration)):
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valid = True
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# invalidate passes that start too soon
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if tr < ephem.Date(datetime.now() + timedelta(minutes=5)):
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valid = False
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# get pass information
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satpass = {
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'passid': passid,
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'mytime': str(observer.date),
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'name': str(satellite.name),
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'id': str(satellite.id),
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'tle1': str(satellite.tle1),
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'tle2': str(satellite.tle2),
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'tr': tr.datetime(), # Rise time
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'azr': azimuth_r, # Rise Azimuth
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'tt': tt.datetime(), # Max altitude time
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'altt': elevation, # Max altitude
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'ts': ts.datetime(), # Set time
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'azs': azimuth_s, # Set azimuth
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'valid': valid,
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'uuid': satellite.transmitter,
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'success_rate': satellite.success_rate,
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'good_count': satellite.good_count,
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'data_count': satellite.data_count,
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'mode': satellite.mode,
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'scheduled': False
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}
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passes.append(satpass)
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observer.date = ephem.Date(ts).datetime() + timedelta(minutes=1)
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else:
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keep_digging = False
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return passes
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def get_priority_passes(passes, priorities, favorite_transmitters, search, min_priority):
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priority = []
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normal = []
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for satpass in passes:
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# Get user defined priorities
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if satpass['id'] in priorities:
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satpass['priority'] = priorities[satpass['id']]
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if satpass['id'] in favorite_transmitters:
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satpass['uuid'] = favorite_transmitters[satpass['id']]
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# Add if priority is high enough
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if satpass['priority'] >= min_priority:
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priority.append(satpass)
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elif search:
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# Find satellite transmitter with highest number of good observations
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max_good_count = max([s['good_count'] for s in passes if s["id"] == satpass["id"]])
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if max_good_count > 0:
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satpass['priority'] = \
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(float(satpass['altt']) / 90.0) \
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* satpass['success_rate'] \
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* float(satpass['good_count']) / max_good_count
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else:
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satpass['priority'] = (float(satpass['altt']) / 90.0) * satpass['success_rate']
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# Add if priority is high enough
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if satpass['priority'] >= min_priority:
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normal.append(satpass)
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return (priority, normal)
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def get_groundstation_info(ground_station_id):
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logging.info("Requesting information for ground station %d" % ground_station_id)
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# Loop
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r = requests.get("{}/api/stations/?id={:d}".format(settings.NETWORK_BASE_URL,
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ground_station_id))
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selected_stations = list(filter(lambda s: s['id'] == ground_station_id, r.json()))
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if not selected_stations:
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logging.info('No ground station information found!')
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# Exit if no ground station found
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sys.exit()
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logging.info('Ground station information retrieved!')
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station = selected_stations[0]
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if station['status'] == 'Online' or station['status'] == 'Testing':
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return station
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else:
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logging.info("Ground station {} neither in 'online' nor in 'testing' mode, "
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"can't schedule!".format(ground_station_id))
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return {}
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def get_last_update(fname):
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try:
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fp = open(fname, "r")
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line = fp.readline()
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fp.close()
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return datetime.strptime(line.strip(), "%Y-%m-%dT%H:%M:%S")
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except IOError:
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return None
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def update_needed(tnow, ground_station_id, cache_dir):
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# Get last update
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tlast = get_last_update(os.path.join(cache_dir, "last_update_%d.txt" % ground_station_id))
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if tlast is None or (tnow - tlast).total_seconds() > settings.CACHE_AGE * 3600:
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return True
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if not os.path.isfile(os.path.join(cache_dir, "transmitters_%d.txt" % ground_station_id)):
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return True
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if not os.path.isfile(os.path.join(cache_dir, "tles_%d.txt" % ground_station_id)):
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return True
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return False
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def schedule_observation(session, norad_cat_id, uuid, ground_station_id, starttime, endtime):
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obsURL = '{}/observations/new/'.format(settings.NETWORK_BASE_URL) # Observation URL
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# Get the observation/new/ page to get the CSFR token
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obs = session.get(obsURL)
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obs_html = lxml.html.fromstring(obs.text)
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hidden_inputs = obs_html.xpath(r'//form//input[@type="hidden"]')
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form = {x.attrib["name"]: x.attrib["value"] for x in hidden_inputs}
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form["satellite"] = norad_cat_id
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form["transmitter"] = uuid
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form["start-time"] = starttime
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form["end-time"] = endtime
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form["0-starting_time"] = starttime
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form["0-ending_time"] = endtime
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form["0-station"] = ground_station_id
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form["total"] = str(1)
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session.post(obsURL, data=form, headers={'referer': obsURL})
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logging.debug("Scheduled!")
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