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db-timetable.py
executable file
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db-timetable.py
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#!/usr/bin/env python3
import paho.mqtt.publish as publish
import requests
import argparse
import logging
import json
import time
import datetime
import dateparser
import xml.dom.minidom
from diskcache import Cache
parser = argparse.ArgumentParser(description='Parse DB timetable')
parser.add_argument(
'--log', help='Log level: DEBUG, INFO, WARNING, ERROR, CRITICAL', default='INFO')
parser.add_argument('--mqtt-host', help='MQTT broker host',
default='localhost')
parser.add_argument('--mqtt-port', help='MQTT broker port', default='1883')
parser.add_argument('--mqtt-user', help='MQTT broker user', default='user')
parser.add_argument(
'--mqtt-pass', help='MQTT broker password', default='password')
parser.add_argument('--mqtt-topic', help='MQTT broker topic',
default='db-timetable')
parser.add_argument('--stop-id',
help='Stop id (please find proper one in https://developer.deutschebahn.com/'
' and copy it from URL), value "eva" numeric, default is Karlsruhe Hbf (8000191)',
default='8000191')
parser.add_argument('--api-key',
help='API key. Please find proper one in https://developer.deutschebahn.com/'
'it is free, just register there',
)
parser.add_argument('--size',
help='Try to find minimum trains amount (maximum 20 requests limit)',
default=4
)
args = parser.parse_args()
cache = Cache(directory='/tmp/db-timetable')
numeric_level = getattr(logging, args.log.upper(), None)
if not isinstance(numeric_level, int):
raise ValueError('Invalid log level: %s' % numeric_level)
logging.basicConfig(level=numeric_level)
logging.debug(args)
mqtt_auth = {'username': args.mqtt_user, 'password': args.mqtt_pass}
# Find amount
trains = []
request_time = datetime.datetime.now()
for x in range(20):
if len(trains) >= args.size:
logging.debug(f"Reached max trains with {len(trains)} records")
break
cache_id = f"{args.stop_id}-{request_time.strftime('%Y-%m-%d-%H')}"
logging.debug(f"Requesting table for {request_time.isoformat()}")
data = cache.get(cache_id)
if not data:
logging.debug(f"Cache miss, reading from network")
# f = open('test-db.xml', 'r')
# data = f.read()
headers = {"Authorization": f"Bearer {args.api_key}"}
api_url = f"https://api.deutschebahn.com/timetables/v1/plan/{args.stop_id}/{request_time.strftime('%y%m%d')}/{request_time.strftime('%H')}"
data = requests.get(api_url, headers=headers).content.decode('UTF-8')
cache.set(cache_id, data, expire=86400)
else:
logging.debug(f"Cache used")
# Next hour
request_time += datetime.timedelta(hours=1)
doc = xml.dom.minidom.parseString(data)
doc_trains = doc.getElementsByTagName("s")
station = doc.getElementsByTagName("timetable")[0].getAttribute("station")
for el in doc_trains:
train_id = el.getAttribute("id")
el_train = el.getElementsByTagName("tl")[0]
train_number = '?'
train_path = []
train_dst = ''
# Only arrives? (no DST)
if not el.getElementsByTagName("dp"):
# DST is current station
el_depart = el.getElementsByTagName("ar")[0]
train_path = []
train_dst = station
else:
el_depart = el.getElementsByTagName("dp")[0]
train_path = el_depart.getAttribute("ppth").split('|')
train_dst = train_path[-1]
# Avoid duplicates
train_exists = False
try:
train_exists = next(x for x in trains if x["id"] == train_id)
except:
pass
train = {}
train['id'] = train_id
train['type'] = el_train.getAttribute('c')
train['number'] = el_depart.getAttribute("l")
train['route'] = f"{train['type']}{train['number']}"
train['path'] = train_path
train['destination_city'] = train_dst
train['tms'] = datetime.datetime.fromtimestamp(time.mktime(time.strptime(
el_depart.getAttribute("pt"), '%y%m%d%H%M')))
# Skip trains from the past
time_delta = train['tms'] - datetime.datetime.now()
time_delta_past = time_delta.total_seconds() < 0
if not time_delta_past and not train_exists:
trains.append(train)
logging.debug(train)
# Sort data
trains.sort(key=lambda x: x.get('tms'), reverse=False)
logging.debug(f"Total trains: {len(trains)}")
# If we have less trains as requested, fill DB array with N/A values
if len(trains) < args.size:
for x in range(args.size - len(trains)):
train = {}
train['id'] = 'N/A'
train['type'] = 'N/A'
train['number'] = 'N/A'
train['route'] = 'N/A'
train['path'] = []
train['destination_city'] = 'N/A'
train['tms'] = datetime.datetime.now()
trains.append(train)
# Publish trains
for idx, train in enumerate(trains):
# Human-nice time
time_diff = train['tms'] - datetime.datetime.now()
time_diff = time_diff.total_seconds() // 60
if (time_diff < 10):
train['time'] = f"{time_diff:.0f} min"
else:
train['time'] = train['tms'].strftime('%H:%M')
train['tms'] = train['tms'].isoformat()
train['summary_text'] = f"{train['route']} {train['destination_city']} | {train['time']}"
payload = json.dumps(train)
logging.debug(payload)
# Publish route to MQTT
publish.single(args.mqtt_topic+'/route-'+str(idx), payload=payload, qos=0, retain=True, hostname=args.mqtt_host,
port=int(args.mqtt_port), client_id="DB-Routes", auth=mqtt_auth)