89 lines
2.3 KiB
Python
89 lines
2.3 KiB
Python
# Helper functions for various Lora receivers
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# Nico Schottelius <nico.schottelius -at- ungleich.ch>
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# 2016-11-02
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# GPLv3+
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import psycopg2
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import json
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import logging
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import select
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import psycopg2
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import psycopg2.extensions
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import sys
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import time
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import websocket
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log = logging.getLogger("lorautil")
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dbname="lorawan"
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def db_notify(provider, payload='', deveui=''):
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notify="{}:{}".format(deveui, payload)
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log.debug("Notify: {} {}".format(provider, notify))
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try:
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conn = psycopg2.connect("dbname={}".format(dbname))
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cursor = conn.cursor()
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cursor.execute("select pg_notify (%s, %s)", (provider, notify))
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cursor.connection.commit()
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except Exception as e:
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log.error("DB Notify failed: %s" % e)
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def db_insert_json(provider, data, payload='', deveui=''):
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try:
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conn = psycopg2.connect("dbname={}".format(dbname))
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cursor = conn.cursor()
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cursor.execute("insert into packets values (DEFAULT, DEFAULT, %s, %s, %s, %s)", (provider, data, payload, deveui))
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cursor.connection.commit()
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conn.close()
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except Exception as e:
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log.error("DB Insert failed: %s" % e)
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def jsonToDict(data):
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return json.loads(data)
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def nodered_from_stdin():
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provider = sys.argv[1]
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for line in sys.stdin:
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print("{} -> {}".format(provider, line))
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nodered_send(provider,line)
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time.sleep(0.1)
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def nodered_send(provider, data):
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ws = websocket.create_connection("ws://localhost:1880/{}".format(provider))
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ws.send("%s" % data)
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ws.close()
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channels = [ "loriot", "swisscom", "ttn" ]
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def pg_conn_notify():
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conns = []
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for channel in channels:
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conn = psycopg2.connect("dbname={}".format(dbname))
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conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
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curs = conn.cursor()
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curs.execute("LISTEN {};".format(channel))
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conns.append(conn)
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log.debug("Waiting for notifications on channel {}".format(channel))
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return conns
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def pg_wait_for_pkg(conns, callback):
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readable, writable, exceptional = select.select(conns,[],[])
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for conn in readable:
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conn.poll()
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while conn.notifies:
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notify = conn.notifies.pop(0)
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log.debug("Got NOTIFY: {} {} {}".format(notify.pid, notify.channel, notify.payload))
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callback(notify.channel, notify.payload)
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