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#!/usr/bin/env python3
import asyncio
import json
import logging
from typing import Optional
from home.config import config
from home.util import parse_addr
from home.temphum import SensorType, create_sensor, TempHumSensor
logger = logging.getLogger(__name__)
sensor: Optional[TempHumSensor] = None
lock = asyncio.Lock()
delay = 0.01
async def get_measurements():
async with lock:
await asyncio.sleep(delay)
temp = sensor.temperature()
rh = sensor.humidity()
return rh, temp
async def handle_client(reader, writer):
request = None
while request != 'quit':
try:
request = await reader.read(255)
if request == b'\x04':
break
request = request.decode('utf-8').strip()
except Exception:
break
if request == 'read':
try:
rh, temp = await asyncio.wait_for(get_measurements(), timeout=3)
data = dict(humidity=rh, temp=temp)
except asyncio.TimeoutError as e:
logger.exception(e)
data = dict(error='i2c call timed out')
else:
data = dict(error='invalid request')
writer.write((json.dumps(data) + '\r\n').encode('utf-8'))
try:
await writer.drain()
except ConnectionResetError:
pass
writer.close()
async def run_server(host, port):
server = await asyncio.start_server(handle_client, host, port)
async with server:
logger.info('Server started.')
await server.serve_forever()
if __name__ == '__main__':
config.load()
if 'measure_delay' in config['sensor']:
delay = float(config['sensor']['measure_delay'])
sensor = create_sensor(SensorType(config['sensor']['type']),
int(config['sensor']['bus']))
try:
host, port = parse_addr(config['server']['listen'])
asyncio.run(run_server(host, port))
except KeyboardInterrupt:
logging.info('Exiting...')
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