-
-
Notifications
You must be signed in to change notification settings - Fork 30.1k
/
event.py
660 lines (582 loc) · 25 KB
/
event.py
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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
"""ONVIF event abstraction."""
from __future__ import annotations
import asyncio
from collections.abc import Callable
import datetime as dt
from aiohttp.web import Request
from httpx import RemoteProtocolError, RequestError, TransportError
from onvif import ONVIFCamera
from onvif.client import (
NotificationManager,
PullPointManager as ONVIFPullPointManager,
retry_connection_error,
)
from onvif.exceptions import ONVIFError
from onvif.util import stringify_onvif_error
from zeep.exceptions import Fault, ValidationError, XMLParseError
from homeassistant.components import webhook
from homeassistant.config_entries import ConfigEntry
from homeassistant.core import CALLBACK_TYPE, HassJob, HomeAssistant, callback
from homeassistant.helpers.device_registry import format_mac
from homeassistant.helpers.event import async_call_later
from homeassistant.helpers.network import NoURLAvailableError, get_url
from .const import DOMAIN, LOGGER
from .models import Event, PullPointManagerState, WebHookManagerState
from .parsers import PARSERS
# Topics in this list are ignored because we do not want to create
# entities for them.
UNHANDLED_TOPICS: set[str] = {"tns1:MediaControl/VideoEncoderConfiguration"}
SUBSCRIPTION_ERRORS = (Fault, asyncio.TimeoutError, TransportError)
CREATE_ERRORS = (ONVIFError, Fault, RequestError, XMLParseError, ValidationError)
SET_SYNCHRONIZATION_POINT_ERRORS = (*SUBSCRIPTION_ERRORS, TypeError)
UNSUBSCRIBE_ERRORS = (XMLParseError, *SUBSCRIPTION_ERRORS)
RENEW_ERRORS = (ONVIFError, RequestError, XMLParseError, *SUBSCRIPTION_ERRORS)
#
# We only keep the subscription alive for 10 minutes, and will keep
# renewing it every 8 minutes. This is to avoid the camera
# accumulating subscriptions which will be impossible to clean up
# since ONVIF does not provide a way to list existing subscriptions.
#
# If we max out the number of subscriptions, the camera will stop
# sending events to us, and we will not be able to recover until
# the subscriptions expire or the camera is rebooted.
#
SUBSCRIPTION_TIME = dt.timedelta(minutes=10)
# SUBSCRIPTION_RENEW_INTERVAL Must be less than the
# overall timeout of 90 * (SUBSCRIPTION_ATTEMPTS) 2 = 180 seconds
#
# We use 8 minutes between renewals to make sure we never hit the
# 10 minute limit even if the first renewal attempt fails
SUBSCRIPTION_RENEW_INTERVAL = 8 * 60
# The number of attempts to make when creating or renewing a subscription
SUBSCRIPTION_ATTEMPTS = 2
# The time to wait before trying to restart the subscription if it fails
SUBSCRIPTION_RESTART_INTERVAL_ON_ERROR = 60
PULLPOINT_POLL_TIME = dt.timedelta(seconds=60)
PULLPOINT_MESSAGE_LIMIT = 100
PULLPOINT_COOLDOWN_TIME = 0.75
class EventManager:
"""ONVIF Event Manager."""
def __init__(
self,
hass: HomeAssistant,
device: ONVIFCamera,
config_entry: ConfigEntry,
name: str,
) -> None:
"""Initialize event manager."""
self.hass = hass
self.device = device
self.config_entry = config_entry
self.unique_id = config_entry.unique_id
self.name = name
self.webhook_manager = WebHookManager(self)
self.pullpoint_manager = PullPointManager(self)
self._uid_by_platform: dict[str, set[str]] = {}
self._events: dict[str, Event] = {}
self._listeners: list[CALLBACK_TYPE] = []
@property
def started(self) -> bool:
"""Return True if event manager is started."""
return (
self.webhook_manager.state == WebHookManagerState.STARTED
or self.pullpoint_manager.state == PullPointManagerState.STARTED
)
@callback
def async_add_listener(self, update_callback: CALLBACK_TYPE) -> Callable[[], None]:
"""Listen for data updates."""
# We always have to listen for events or we will never
# know which sensors to create. In practice we always have
# a listener anyways since binary_sensor and sensor will
# create a listener when they are created.
self._listeners.append(update_callback)
@callback
def remove_listener() -> None:
"""Remove update listener."""
self.async_remove_listener(update_callback)
return remove_listener
@callback
def async_remove_listener(self, update_callback: CALLBACK_TYPE) -> None:
"""Remove data update."""
if update_callback in self._listeners:
self._listeners.remove(update_callback)
async def async_start(self, try_pullpoint: bool, try_webhook: bool) -> bool:
"""Start polling events."""
# Always start pull point first, since it will populate the event list
event_via_pull_point = (
try_pullpoint and await self.pullpoint_manager.async_start()
)
events_via_webhook = try_webhook and await self.webhook_manager.async_start()
return events_via_webhook or event_via_pull_point
async def async_stop(self) -> None:
"""Unsubscribe from events."""
self._listeners = []
await self.pullpoint_manager.async_stop()
await self.webhook_manager.async_stop()
@callback
def async_callback_listeners(self) -> None:
"""Update listeners."""
for update_callback in self._listeners:
update_callback()
# pylint: disable=protected-access
async def async_parse_messages(self, messages) -> None:
"""Parse notification message."""
unique_id = self.unique_id
assert unique_id is not None
for msg in messages:
# Guard against empty message
if not msg.Topic:
continue
# Topic may look like the following
#
# tns1:RuleEngine/CellMotionDetector/Motion//.
# tns1:RuleEngine/CellMotionDetector/Motion
# tns1:RuleEngine/CellMotionDetector/Motion/
#
# Our parser expects the topic to be
# tns1:RuleEngine/CellMotionDetector/Motion
topic = msg.Topic._value_1.rstrip("/.")
if not (parser := PARSERS.get(topic)):
if topic not in UNHANDLED_TOPICS:
LOGGER.info(
"%s: No registered handler for event from %s: %s",
self.name,
unique_id,
msg,
)
UNHANDLED_TOPICS.add(topic)
continue
event = await parser(unique_id, msg)
if not event:
LOGGER.info(
"%s: Unable to parse event from %s: %s", self.name, unique_id, msg
)
return
self.get_uids_by_platform(event.platform).add(event.uid)
self._events[event.uid] = event
def get_uid(self, uid: str) -> Event | None:
"""Retrieve event for given id."""
return self._events.get(uid)
def get_platform(self, platform) -> list[Event]:
"""Retrieve events for given platform."""
return [event for event in self._events.values() if event.platform == platform]
def get_uids_by_platform(self, platform: str) -> set[str]:
"""Retrieve uids for a given platform."""
if (possible_uids := self._uid_by_platform.get(platform)) is None:
uids: set[str] = set()
self._uid_by_platform[platform] = uids
return uids
return possible_uids
@callback
def async_webhook_failed(self) -> None:
"""Mark webhook as failed."""
if self.pullpoint_manager.state != PullPointManagerState.PAUSED:
return
LOGGER.debug("%s: Switching to PullPoint for events", self.name)
self.pullpoint_manager.async_resume()
@callback
def async_webhook_working(self) -> None:
"""Mark webhook as working."""
if self.pullpoint_manager.state != PullPointManagerState.STARTED:
return
LOGGER.debug("%s: Switching to webhook for events", self.name)
self.pullpoint_manager.async_pause()
@callback
def async_mark_events_stale(self) -> None:
"""Mark all events as stale when the subscriptions fail since we are out of sync."""
self._events.clear()
self.async_callback_listeners()
class PullPointManager:
"""ONVIF PullPoint Manager.
If the camera supports webhooks and the webhook is reachable, the pullpoint
manager will keep the pull point subscription alive, but will not poll for
messages unless the webhook fails.
"""
def __init__(self, event_manager: EventManager) -> None:
"""Initialize pullpoint manager."""
self.state = PullPointManagerState.STOPPED
self._event_manager = event_manager
self._device = event_manager.device
self._hass = event_manager.hass
self._name = event_manager.name
self._pullpoint_manager: ONVIFPullPointManager | None = None
self._cancel_pull_messages: CALLBACK_TYPE | None = None
self._pull_messages_job = HassJob(
self._async_background_pull_messages_or_reschedule,
f"{self._name}: pull messages",
)
self._pull_messages_task: asyncio.Task[None] | None = None
async def async_start(self) -> bool:
"""Start pullpoint subscription."""
assert (
self.state == PullPointManagerState.STOPPED
), "PullPoint manager already started"
LOGGER.debug("%s: Starting PullPoint manager", self._name)
if not await self._async_start_pullpoint():
self.state = PullPointManagerState.FAILED
return False
self.state = PullPointManagerState.STARTED
self.async_schedule_pull_messages()
return True
@callback
def async_pause(self) -> None:
"""Pause pullpoint subscription."""
LOGGER.debug("%s: Pausing PullPoint manager", self._name)
self.state = PullPointManagerState.PAUSED
# Cancel the renew job so we don't renew the subscription
# and stop pulling messages.
self.async_cancel_pull_messages()
if self._pullpoint_manager:
self._pullpoint_manager.pause()
# We do not unsubscribe from the pullpoint subscription and instead
# let the subscription expire since some cameras will terminate all
# subscriptions if we unsubscribe which will break the webhook.
@callback
def async_resume(self) -> None:
"""Resume pullpoint subscription."""
LOGGER.debug("%s: Resuming PullPoint manager", self._name)
self.state = PullPointManagerState.STARTED
if self._pullpoint_manager:
self._pullpoint_manager.resume()
self.async_schedule_pull_messages()
async def async_stop(self) -> None:
"""Unsubscribe from PullPoint and cancel callbacks."""
self.state = PullPointManagerState.STOPPED
await self._async_cancel_and_unsubscribe()
async def _async_start_pullpoint(self) -> bool:
"""Start pullpoint subscription."""
try:
await self._async_create_pullpoint_subscription()
except CREATE_ERRORS as err:
LOGGER.debug(
"%s: Device does not support PullPoint service or has too many subscriptions: %s",
self._name,
stringify_onvif_error(err),
)
return False
return True
async def _async_cancel_and_unsubscribe(self) -> None:
"""Cancel and unsubscribe from PullPoint."""
self.async_cancel_pull_messages()
if self._pull_messages_task:
self._pull_messages_task.cancel()
await self._async_unsubscribe_pullpoint()
@retry_connection_error(SUBSCRIPTION_ATTEMPTS)
async def _async_create_pullpoint_subscription(self) -> None:
"""Create pullpoint subscription."""
self._pullpoint_manager = await self._device.create_pullpoint_manager(
SUBSCRIPTION_TIME, self._event_manager.async_mark_events_stale
)
await self._pullpoint_manager.set_synchronization_point()
async def _async_unsubscribe_pullpoint(self) -> None:
"""Unsubscribe the pullpoint subscription."""
if not self._pullpoint_manager or self._pullpoint_manager.closed:
return
LOGGER.debug("%s: Unsubscribing from PullPoint", self._name)
try:
await self._pullpoint_manager.shutdown()
except UNSUBSCRIBE_ERRORS as err:
LOGGER.debug(
(
"%s: Failed to unsubscribe PullPoint subscription;"
" This is normal if the device restarted: %s"
),
self._name,
stringify_onvif_error(err),
)
self._pullpoint_manager = None
async def _async_pull_messages(self) -> None:
"""Pull messages from device."""
if self._pullpoint_manager is None:
return
service = self._pullpoint_manager.get_service()
LOGGER.debug(
"%s: Pulling PullPoint messages timeout=%s limit=%s",
self._name,
PULLPOINT_POLL_TIME,
PULLPOINT_MESSAGE_LIMIT,
)
next_pull_delay = None
response = None
try:
if self._hass.is_running:
response = await service.PullMessages(
{
"MessageLimit": PULLPOINT_MESSAGE_LIMIT,
"Timeout": PULLPOINT_POLL_TIME,
}
)
else:
LOGGER.debug(
"%s: PullPoint skipped because Home Assistant is not running yet",
self._name,
)
except RemoteProtocolError as err:
# Either a shutdown event or the camera closed the connection. Because
# http://datatracker.ietf.org/doc/html/rfc2616#section-8.1.4 allows the server
# to close the connection at any time, we treat this as a normal. Some
# cameras may close the connection if there are no messages to pull.
LOGGER.debug(
"%s: PullPoint subscription encountered a remote protocol error "
"(this is normal for some cameras): %s",
self._name,
stringify_onvif_error(err),
)
except Fault as err:
# Device may not support subscriptions so log at debug level
# when we get an XMLParseError
LOGGER.debug(
"%s: Failed to fetch PullPoint subscription messages: %s",
self._name,
stringify_onvif_error(err),
)
# Treat errors as if the camera restarted. Assume that the pullpoint
# subscription is no longer valid.
self._pullpoint_manager.resume()
except (XMLParseError, RequestError, TimeoutError, TransportError) as err:
LOGGER.debug(
"%s: PullPoint subscription encountered an unexpected error and will be retried "
"(this is normal for some cameras): %s",
self._name,
stringify_onvif_error(err),
)
# Avoid renewing the subscription too often since it causes problems
# for some cameras, mainly the Tapo ones.
next_pull_delay = SUBSCRIPTION_RESTART_INTERVAL_ON_ERROR
finally:
self.async_schedule_pull_messages(next_pull_delay)
if self.state != PullPointManagerState.STARTED:
# If the webhook became started working during the long poll,
# and we got paused, our data is stale and we should not process it.
LOGGER.debug(
"%s: PullPoint state is %s (likely due to working webhook), skipping PullPoint messages",
self._name,
self.state,
)
return
if not response:
return
# Parse response
event_manager = self._event_manager
if (notification_message := response.NotificationMessage) and (
number_of_events := len(notification_message)
):
LOGGER.debug(
"%s: continuous PullMessages: %s event(s)",
self._name,
number_of_events,
)
await event_manager.async_parse_messages(notification_message)
event_manager.async_callback_listeners()
else:
LOGGER.debug("%s: continuous PullMessages: no events", self._name)
@callback
def async_cancel_pull_messages(self) -> None:
"""Cancel the PullPoint task."""
if self._cancel_pull_messages:
self._cancel_pull_messages()
self._cancel_pull_messages = None
@callback
def async_schedule_pull_messages(self, delay: float | None = None) -> None:
"""Schedule async_pull_messages to run.
Used as fallback when webhook is not working.
Must not check if the webhook is working.
"""
self.async_cancel_pull_messages()
if self.state != PullPointManagerState.STARTED:
return
if self._pullpoint_manager:
when = delay if delay is not None else PULLPOINT_COOLDOWN_TIME
self._cancel_pull_messages = async_call_later(
self._hass, when, self._pull_messages_job
)
@callback
def _async_background_pull_messages_or_reschedule(
self, _now: dt.datetime | None = None
) -> None:
"""Pull messages from device in the background."""
if self._pull_messages_task and not self._pull_messages_task.done():
LOGGER.debug(
"%s: PullPoint message pull is already in process, skipping pull",
self._name,
)
self.async_schedule_pull_messages()
return
self._pull_messages_task = self._hass.async_create_background_task(
self._async_pull_messages(),
f"{self._name} background pull messages",
)
class WebHookManager:
"""Manage ONVIF webhook subscriptions.
If the camera supports webhooks, we will use that instead of
pullpoint subscriptions as soon as we detect that the camera
can reach our webhook.
"""
def __init__(self, event_manager: EventManager) -> None:
"""Initialize webhook manager."""
self.state = WebHookManagerState.STOPPED
self._event_manager = event_manager
self._device = event_manager.device
self._hass = event_manager.hass
config_entry = event_manager.config_entry
self._old_webhook_unique_id = f"{DOMAIN}_{config_entry.entry_id}"
# Some cameras have a limit on the length of the webhook URL
# so we use a shorter unique ID for the webhook.
unique_id = config_entry.unique_id
assert unique_id is not None
webhook_id = format_mac(unique_id).replace(":", "").lower()
self._webhook_unique_id = f"{DOMAIN}{webhook_id}"
self._name = event_manager.name
self._webhook_url: str | None = None
self._notification_manager: NotificationManager | None = None
async def async_start(self) -> bool:
"""Start polling events."""
LOGGER.debug("%s: Starting webhook manager", self._name)
assert (
self.state == WebHookManagerState.STOPPED
), "Webhook manager already started"
assert self._webhook_url is None, "Webhook already registered"
self._async_register_webhook()
if not await self._async_start_webhook():
self.state = WebHookManagerState.FAILED
return False
self.state = WebHookManagerState.STARTED
return True
async def async_stop(self) -> None:
"""Unsubscribe from events."""
self.state = WebHookManagerState.STOPPED
await self._async_unsubscribe_webhook()
self._async_unregister_webhook()
@retry_connection_error(SUBSCRIPTION_ATTEMPTS)
async def _async_create_webhook_subscription(self) -> None:
"""Create webhook subscription."""
LOGGER.debug(
"%s: Creating webhook subscription with URL: %s",
self._name,
self._webhook_url,
)
try:
self._notification_manager = await self._device.create_notification_manager(
address=self._webhook_url,
interval=SUBSCRIPTION_TIME,
subscription_lost_callback=self._event_manager.async_mark_events_stale,
)
except ValidationError as err:
# This should only happen if there is a problem with the webhook URL
# that is causing it to not be well formed.
LOGGER.exception(
"%s: validation error while creating webhook subscription: %s",
self._name,
err,
)
raise
await self._notification_manager.set_synchronization_point()
LOGGER.debug(
"%s: Webhook subscription created with URL: %s",
self._name,
self._webhook_url,
)
async def _async_start_webhook(self) -> bool:
"""Start webhook."""
try:
await self._async_create_webhook_subscription()
except CREATE_ERRORS as err:
self._event_manager.async_webhook_failed()
LOGGER.debug(
"%s: Device does not support notification service or too many subscriptions: %s",
self._name,
stringify_onvif_error(err),
)
return False
return True
@callback
def _async_register_webhook(self) -> None:
"""Register the webhook for motion events."""
LOGGER.debug("%s: Registering webhook: %s", self._name, self._webhook_unique_id)
try:
base_url = get_url(self._hass, prefer_external=False)
except NoURLAvailableError:
try:
base_url = get_url(self._hass, prefer_external=True)
except NoURLAvailableError:
return
webhook_id = self._webhook_unique_id
self._async_unregister_webhook()
webhook.async_register(
self._hass, DOMAIN, webhook_id, webhook_id, self._async_handle_webhook
)
webhook_path = webhook.async_generate_path(webhook_id)
self._webhook_url = f"{base_url}{webhook_path}"
LOGGER.debug("%s: Registered webhook: %s", self._name, webhook_id)
@callback
def _async_unregister_webhook(self):
"""Unregister the webhook for motion events."""
LOGGER.debug(
"%s: Unregistering webhook %s", self._name, self._webhook_unique_id
)
webhook.async_unregister(self._hass, self._old_webhook_unique_id)
webhook.async_unregister(self._hass, self._webhook_unique_id)
self._webhook_url = None
async def _async_handle_webhook(
self, hass: HomeAssistant, webhook_id: str, request: Request
) -> None:
"""Handle incoming webhook."""
content: bytes | None = None
try:
content = await request.read()
except ConnectionResetError as ex:
LOGGER.error("Error reading webhook: %s", ex)
return
except asyncio.CancelledError as ex:
LOGGER.error("Error reading webhook: %s", ex)
raise
finally:
self._hass.async_create_background_task(
self._async_process_webhook(hass, webhook_id, content),
f"ONVIF event webhook for {self._name}",
)
async def _async_process_webhook(
self, hass: HomeAssistant, webhook_id: str, content: bytes | None
) -> None:
"""Process incoming webhook data in the background."""
event_manager = self._event_manager
if content is None:
# webhook is marked as not working as something
# went wrong. We will mark it as working again
# when we receive a valid notification.
event_manager.async_webhook_failed()
return
if not self._notification_manager:
LOGGER.debug(
"%s: Received webhook before notification manager is setup", self._name
)
return
if not (result := self._notification_manager.process(content)):
LOGGER.debug("%s: Failed to process webhook %s", self._name, webhook_id)
return
LOGGER.debug(
"%s: Processed webhook %s with %s event(s)",
self._name,
webhook_id,
len(result.NotificationMessage),
)
event_manager.async_webhook_working()
await event_manager.async_parse_messages(result.NotificationMessage)
event_manager.async_callback_listeners()
async def _async_unsubscribe_webhook(self) -> None:
"""Unsubscribe from the webhook."""
if not self._notification_manager or self._notification_manager.closed:
return
LOGGER.debug("%s: Unsubscribing from webhook", self._name)
try:
await self._notification_manager.shutdown()
except UNSUBSCRIBE_ERRORS as err:
LOGGER.debug(
(
"%s: Failed to unsubscribe webhook subscription;"
" This is normal if the device restarted: %s"
),
self._name,
stringify_onvif_error(err),
)
self._notification_manager = None