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#!/usr/bin/env python3
import logging
import os
import signal
import sqlite3
import sys
import time
import yaml
from RFXtrx import PySerialTransport
def setup_database(database_path, logger):
db_connection = sqlite3.connect(database_path)
db_cursor = db_connection.cursor()
try:
db_cursor.execute("CREATE TABLE weather( \
id INTEGER PRIMARY KEY, \
timestamp DATETIME, \
handle TEXT, \
temperature FLOAT, \
humidity FLOAT);")
except sqlite3.OperationalError:
logger.info("Not re-creating 'weather' table")
pass
return db_connection
def setup_serial(device_path):
serial_connection = PySerialTransport(device_path)
serial_connection.reset()
return serial_connection
def add_data_to_db(data, handle, db_connection):
db_cursor = db_connection.cursor()
db_cursor.execute(f"INSERT INTO weather \
(timestamp, handle, temperature, humidity) \
VALUES ( {int(time.time())}, \
\"{handle}\", \
{data.values['Temperature']}, \
{data.values['Humidity']})")
db_connection.commit()
def loop(known_devices, serial_connection, db_connection, logger):
while True:
logger.info("(Re-)Starting receiver loop")
data = serial_connection.receive_blocking()
if data is None:
logger.info("Didn't receive data")
continue
logger.info(data)
try:
if data.device.id_string not in known_devices:
logger.info(f"Unknown device with id \"{device_id}\" and type \"{device_type}\", ignoring")
continue
except:
logger.info("Device ID not found, likely not a 'SensorEvent', ignoring")
continue
handle = known_devices[data.device.id_string]["handle"]
add_data_to_db(data, handle, db_connection)
def write_pid_file(pid_file_path, logger):
if os.path.exists(pid_file_path):
with open(pid_file_path, "r") as pid_file:
pid = pid_file.read()
logger.error(f"Possibly already running with PID {pid}, exiting")
sys.exit(1)
with open(pid_file_path, "w") as pid_file:
pid_file.write(str(os.getpid()))
def load_config(config_file_path, logger):
with open(config_file_path, "r") as f:
config = yaml.safe_load(f.read())
logger.info(f"Loaded configuration from \"{config_file_path}\"")
return config
if __name__ == "__main__":
# logger setup
logging.basicConfig(format='%(asctime)-2s %(levelname)-8s %(message)s',
datefmt='%Y-%m-%dT%H:%M:%S',
level=logging.INFO)
logger = logging.getLogger("weather-logger-receiver")
# load configuration
if len(sys.argv) != 2:
logger.error("Missing path to configuration file, exiting")
sys.exit(1)
config_file_path = sys.argv[1]
config = load_config(config_file_path, logger)
# get known devices
active_location = config["active_location"]
known_devices = config["locations"][active_location]
logger.info(f"Loaded known devices for location \"{active_location}\"")
# write pid file
write_pid_file(config["pid_file_path"], logger)
logger.info(f"Wrote PID file to \"{config['pid_file_path']}\"")
# database setup
db_connection = setup_database(config["database_path"], logger)
logger.info(f"Set up database \"{config['database_path']}\"")
# serial connection setup
serial_connection = setup_serial(config["device_path"])
logger.info(f"Set up serial connection to \"{config['device_path']}\"")
# handle shutdown
def shutdown(*args):
logger.info("Shutting down")
serial_connection.close()
db_connection.close()
try:
os.remove(config["pid_file_path"])
except FileNotFoundError:
pass
sys.exit(0)
signal.signal(signal.SIGINT, shutdown)
signal.signal(signal.SIGTERM, shutdown)
# start main loop
try:
loop(known_devices, serial_connection, db_connection, logger)
except Exception as e:
logger.error(f"Exception: {e}")
finally:
shutdown(config, serial_connection, db_connection, logger)
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