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#!/usr/bin/env python3
import os
from typing import Optional
from aiohttp import web
from aiohttp.web_exceptions import (
HTTPNotFound
)
from home.config import config
from home.util import parse_addr, stringify, format_tb
from home.sound import (
amixer,
Recorder,
RecordStatus,
RecordStorage
)
"""
This script must be run as root as it runs arecord.
This script implements HTTP API for amixer and arecord.
"""
# some global variables
# ---------------------
recorder: Optional[Recorder]
routes = web.RouteTableDef()
storage: Optional[RecordStorage]
# common http funcs & helpers
# ---------------------------
@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)
def ok(data=None):
if data is None:
data = 1
response = {'response': data}
return web.json_response(response, dumps=stringify)
# recording methods
# -----------------
@routes.get('/record/')
async def do_record(request):
duration = int(request.query['duration'])
max = Recorder.get_max_record_time()*15
if not 0 < duration <= max:
raise ValueError(f'invalid duration: max duration is {max}')
record_id = recorder.record(duration)
return ok({'id': record_id})
@routes.get('/record/info/{id}/')
async def record_info(request):
record_id = int(request.match_info['id'])
info = recorder.get_info(record_id)
return ok(info.as_dict())
@routes.get('/record/forget/{id}/')
async def record_forget(request):
record_id = int(request.match_info['id'])
info = recorder.get_info(record_id)
assert info.status in (RecordStatus.FINISHED, RecordStatus.ERROR), f"can't forget: record status is {info.status}"
recorder.forget(record_id)
return ok()
@routes.get('/record/download/{id}/')
async def record_download(request):
record_id = int(request.match_info['id'])
info = recorder.get_info(record_id)
assert info.status == RecordStatus.FINISHED, f"record status is {info.status}"
return web.FileResponse(info.file.path)
@routes.get('/storage/list/')
async def storage_list(request):
extended = 'extended' in request.query and int(request.query['extended']) == 1
files = storage.getfiles(as_objects=extended)
if extended:
files = list(map(lambda file: file.__dict__(), files))
return ok({
'files': files
})
@routes.get('/storage/delete/')
async def storage_delete(request):
file_id = request.query['file_id']
file = storage.find(file_id)
if not file:
raise ValueError(f'file {file} not found')
storage.delete(file)
return ok()
@routes.get('/storage/download/')
async def storage_download(request):
file_id = request.query['file_id']
file = storage.find(file_id)
if not file:
raise ValueError(f'file {file} not found')
return web.FileResponse(file.path)
# ALSA mixer methods
# ------------------
def _amixer_control_response(control):
info = amixer.get(control)
caps = amixer.get_caps(control)
return ok({
'caps': caps,
'info': info
})
@routes.get('/amixer/get-all/')
async def amixer_get_all(request):
controls_info = amixer.get_all()
return ok(controls_info)
@routes.get('/amixer/get/{control}/')
async def amixer_get(request):
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
return _amixer_control_response(control)
@routes.get('/amixer/{op:mute|unmute|cap|nocap}/{control}/')
async def amixer_set(request):
op = request.match_info['op']
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
f = getattr(amixer, op)
f(control)
return _amixer_control_response(control)
@routes.get('/amixer/{op:incr|decr}/{control}/')
async def amixer_volume(request):
op = request.match_info['op']
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
def get_step() -> Optional[int]:
if 'step' in request.query:
step = int(request.query['step'])
if not 1 <= step <= 50:
raise ValueError('invalid step value')
return step
return None
f = getattr(amixer, op)
f(control, step=get_step())
return _amixer_control_response(control)
# entry point
# -----------
if __name__ == '__main__':
if not os.getegid() == 0:
raise RuntimeError("Must be run as root.")
config.load('sound_node')
storage = RecordStorage(config['node']['storage'])
recorder = Recorder(storage=storage)
recorder.start_thread()
# start http server
host, port = parse_addr(config['node']['listen'])
app = web.Application()
app.add_routes(routes)
app.middlewares.append(errors_handler_middleware)
web.run_app(app,
host=host,
port=port,
handle_signals=True)
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