1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import asyncio
from typing import List
from typing import Dict
from aiohttp.web import Request
from aiohttp.web import WebSocketResponse
from ...logging import get_logger
from ... import aiotools
from ... import aiohelpers
from ...htserver import exposed_http
from ...htserver import exposed_ws
from ...htserver import WsSession
from ...htserver import HttpServer
# =====
class PstServer(HttpServer): # pylint: disable=too-many-arguments,too-many-instance-attributes
def __init__( # pylint: disable=too-many-arguments,too-many-locals
self,
storage_path: str,
ro_retries_delay: float,
ro_cleanup_delay: float,
remount_cmd: List[str],
) -> None:
super().__init__()
self.__data_path = os.path.join(storage_path, "data")
self.__ro_retries_delay = ro_retries_delay
self.__ro_cleanup_delay = ro_cleanup_delay
self.__remount_cmd = remount_cmd
self.__notifier = aiotools.AioNotifier()
# ===== WEBSOCKET
@exposed_http("GET", "/ws")
async def __ws_handler(self, request: Request) -> WebSocketResponse:
async with self._ws_session(request) as ws:
await ws.send_event("loop", {})
return (await self._ws_loop(ws))
@exposed_ws("ping")
async def __ws_ping_handler(self, ws: WsSession, _: Dict) -> None:
await ws.send_event("pong", {})
# ===== SYSTEM STUFF
async def _init_app(self) -> None:
if (await self.__remount_storage(True)):
await self.__remount_storage(False)
aiotools.create_deadly_task("Controller", self.__controller())
self._add_exposed(self)
async def _on_shutdown(self) -> None:
logger = get_logger(0)
logger.info("Stopping system tasks ...")
await aiotools.stop_all_deadly_tasks()
logger.info("Disconnecting clients ...")
await self.__broadcast_storage_state(False)
if (await self._close_all_wss()):
await asyncio.sleep(self.__ro_cleanup_delay)
logger.info("On-Shutdown complete")
async def _on_cleanup(self) -> None:
logger = get_logger(0)
await self.__remount_storage(False)
logger.info("On-Cleanup complete")
async def _on_ws_opened(self) -> None:
await self.__notifier.notify()
async def _on_ws_closed(self) -> None:
await self.__notifier.notify()
# ===== SYSTEM TASKS
async def __controller(self) -> None:
prev = False
while True:
cur = self.__has_clients()
if not prev and cur:
await self.__broadcast_storage_state(await self.__remount_storage(True))
elif prev and not cur:
while not (await self.__remount_storage(False)):
if self.__has_clients():
continue
await asyncio.sleep(self.__ro_retries_delay)
prev = cur
await self.__notifier.wait()
def __has_clients(self) -> bool:
return bool(self._get_wss())
async def __broadcast_storage_state(self, write_allowed: bool) -> None:
await self._broadcast_ws_event("storage_state", {
"data": {"path": self.__data_path},
"write_allowed": write_allowed,
})
async def __remount_storage(self, rw: bool) -> bool:
return (await aiohelpers.remount("PST", self.__remount_cmd, rw))
|
