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import asyncio
import logging
from pyA20.gpio import gpio
from pyA20.gpio import port as gpioport
from ..util import Addr
logger = logging.getLogger(__name__)
class RelayServer:
OFF = 1
ON = 0
def __init__(self,
pinname: str,
addr: Addr):
if not hasattr(gpioport, pinname):
raise ValueError(f'invalid pin {pinname}')
self.pin = getattr(gpioport, pinname)
self.addr = addr
gpio.init()
gpio.setcfg(self.pin, gpio.OUTPUT)
self.lock = asyncio.Lock()
def run(self):
asyncio.run(self.run_server())
async def relay_set(self, value):
async with self.lock:
gpio.output(self.pin, value)
async def relay_get(self):
async with self.lock:
return int(gpio.input(self.pin)) == RelayServer.ON
async def handle_client(self, 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
data = 'unknown'
if request == 'on':
await self.relay_set(RelayServer.ON)
logger.debug('set on')
data = 'ok'
elif request == 'off':
await self.relay_set(RelayServer.OFF)
logger.debug('set off')
data = 'ok'
elif request == 'get':
status = await self.relay_get()
data = 'on' if status is True else 'off'
writer.write((data + '\r\n').encode('utf-8'))
try:
await writer.drain()
except ConnectionError:
break
try:
writer.close()
except ConnectionError:
pass
async def run_server(self):
host, port = self.addr
server = await asyncio.start_server(self.handle_client, host, port)
async with server:
logger.info('Server started.')
await server.serve_forever()
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