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import asyncio
import json
import logging
import threading
from ..config import config
from aiohttp import web
from aiohttp.web_exceptions import (
HTTPNotFound
)
from typing import Type
from ..util import Addr, stringify, format_tb
logger = logging.getLogger(__name__)
class SoundSensorHitHandler(asyncio.DatagramProtocol):
def datagram_received(self, data, addr):
try:
data = json.loads(data)
except json.JSONDecodeError as e:
logger.error('failed to parse json datagram')
logger.exception(e)
return
try:
name, hits = data
except (ValueError, IndexError) as e:
logger.error('failed to unpack data')
logger.exception(e)
return
self.handler(name, hits)
def handler(self, name: str, hits: int):
pass
class SoundSensorServer:
def __init__(self,
addr: Addr,
handler_impl: Type[SoundSensorHitHandler]):
self.addr = addr
self.impl = handler_impl
self._recording_lock = threading.Lock()
self._recording_enabled = True
if self.guard_control_enabled():
if 'guard_recording_default' in config['server']:
self._recording_enabled = config['server']['guard_recording_default']
def guard_control_enabled(self) -> bool:
return 'guard_control' in config['server'] and config['server']['guard_control'] is True
def set_recording(self, enabled: bool):
with self._recording_lock:
self._recording_enabled = enabled
def is_recording_enabled(self) -> bool:
with self._recording_lock:
return self._recording_enabled
def run(self):
if self.guard_control_enabled():
t = threading.Thread(target=self.run_guard_server)
t.daemon = True
t.start()
loop = asyncio.get_event_loop()
t = loop.create_datagram_endpoint(self.impl, local_addr=self.addr)
loop.run_until_complete(t)
loop.run_forever()
def run_guard_server(self):
routes = web.RouteTableDef()
def ok(data=None):
if data is None:
data = 1
response = {'response': data}
return web.json_response(response, dumps=stringify)
@web.middleware
async def errors_handler_middleware(request, handler):
try:
response = await handler(request)
return response
except HTTPNotFound:
return web.json_response({'error': 'not found'}, status=404)
except Exception as exc:
data = {
'error': exc.__class__.__name__,
'message': exc.message if hasattr(exc, 'message') else str(exc)
}
tb = format_tb(exc)
if tb:
data['stacktrace'] = tb
return web.json_response(data, status=500)
@routes.post('/guard/enable')
async def guard_enable(request):
self.set_recording(True)
return ok()
@routes.post('/guard/disable')
async def guard_disable(request):
self.set_recording(False)
return ok()
@routes.get('/guard/status')
async def guard_status(request):
return ok({'enabled': self.is_recording_enabled()})
asyncio.set_event_loop(asyncio.new_event_loop()) # need to create new event loop in new thread
app = web.Application()
app.add_routes(routes)
app.middlewares.append(errors_handler_middleware)
web.run_app(app,
host=self.addr[0],
port=self.addr[1],
handle_signals=False) # handle_signals=True doesn't work in separate thread
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