blakeblackshear.frigate/frigate/events.py
Nicolas Mowen ad52e238ce
Refactor events to be more generic (#6320)
* Organize event table to be more generalized

* Add appropriate fields to data

* Move tracked object logic to own function

* Add source type to event queue

* rename enum

* Fix types that are used in webUI

* remove redundant

* Formatting

* fix typing

* Rename enum
2023-04-30 12:07:14 -05:00

357 lines
13 KiB
Python

import datetime
import logging
import os
import queue
import threading
from enum import Enum
from pathlib import Path
from peewee import fn
from frigate.config import EventsConfig, FrigateConfig
from frigate.const import CLIPS_DIR
from frigate.models import Event
from frigate.types import CameraMetricsTypes
from frigate.util import to_relative_box
from multiprocessing.queues import Queue
from multiprocessing.synchronize import Event as MpEvent
from typing import Dict
logger = logging.getLogger(__name__)
class EventTypeEnum(str, Enum):
# api = "api"
# audio = "audio"
tracked_object = "tracked_object"
def should_update_db(prev_event: Event, current_event: Event) -> bool:
"""If current_event has updated fields and (clip or snapshot)."""
if current_event["has_clip"] or current_event["has_snapshot"]:
# if this is the first time has_clip or has_snapshot turned true
if not prev_event["has_clip"] and not prev_event["has_snapshot"]:
return True
# or if any of the following values changed
if (
prev_event["top_score"] != current_event["top_score"]
or prev_event["entered_zones"] != current_event["entered_zones"]
or prev_event["thumbnail"] != current_event["thumbnail"]
or prev_event["end_time"] != current_event["end_time"]
):
return True
return False
class EventProcessor(threading.Thread):
def __init__(
self,
config: FrigateConfig,
camera_processes: dict[str, CameraMetricsTypes],
event_queue: Queue,
event_processed_queue: Queue,
timeline_queue: Queue,
stop_event: MpEvent,
):
threading.Thread.__init__(self)
self.name = "event_processor"
self.config = config
self.camera_processes = camera_processes
self.event_queue = event_queue
self.event_processed_queue = event_processed_queue
self.timeline_queue = timeline_queue
self.events_in_process: Dict[str, Event] = {}
self.stop_event = stop_event
def run(self) -> None:
# set an end_time on events without an end_time on startup
Event.update(end_time=Event.start_time + 30).where(
Event.end_time == None
).execute()
while not self.stop_event.is_set():
try:
source_type, event_type, camera, event_data = self.event_queue.get(
timeout=1
)
except queue.Empty:
continue
logger.debug(f"Event received: {event_type} {camera} {event_data['id']}")
self.timeline_queue.put(
(
camera,
source_type,
event_type,
self.events_in_process.get(event_data["id"]),
event_data,
)
)
if source_type == EventTypeEnum.tracked_object:
if event_type == "start":
self.events_in_process[event_data["id"]] = event_data
continue
self.handle_object_detection(event_type, camera, event_data)
# set an end_time on events without an end_time before exiting
Event.update(end_time=datetime.datetime.now().timestamp()).where(
Event.end_time == None
).execute()
logger.info(f"Exiting event processor...")
def handle_object_detection(
self,
event_type: str,
camera: str,
event_data: Event,
) -> None:
"""handle tracked object event updates."""
# if this is the first message, just store it and continue, its not time to insert it in the db
if should_update_db(self.events_in_process[event_data["id"]], event_data):
camera_config = self.config.cameras[camera]
event_config: EventsConfig = camera_config.record.events
width = camera_config.detect.width
height = camera_config.detect.height
first_detector = list(self.config.detectors.values())[0]
start_time = event_data["start_time"] - event_config.pre_capture
end_time = (
None
if event_data["end_time"] is None
else event_data["end_time"] + event_config.post_capture
)
# score of the snapshot
score = (
None
if event_data["snapshot"] is None
else event_data["snapshot"]["score"]
)
# detection region in the snapshot
region = (
None
if event_data["snapshot"] is None
else to_relative_box(
width,
height,
event_data["snapshot"]["region"],
)
)
# bounding box for the snapshot
box = (
None
if event_data["snapshot"] is None
else to_relative_box(
width,
height,
event_data["snapshot"]["box"],
)
)
# keep these from being set back to false because the event
# may have started while recordings and snapshots were enabled
# this would be an issue for long running events
if self.events_in_process[event_data["id"]]["has_clip"]:
event_data["has_clip"] = True
if self.events_in_process[event_data["id"]]["has_snapshot"]:
event_data["has_snapshot"] = True
event = {
Event.id: event_data["id"],
Event.label: event_data["label"],
Event.camera: camera,
Event.start_time: start_time,
Event.end_time: end_time,
Event.zones: list(event_data["entered_zones"]),
Event.thumbnail: event_data["thumbnail"],
Event.has_clip: event_data["has_clip"],
Event.has_snapshot: event_data["has_snapshot"],
Event.model_hash: first_detector.model.model_hash,
Event.model_type: first_detector.model.model_type,
Event.detector_type: first_detector.type,
Event.data: {
"box": box,
"region": region,
"score": score,
"top_score": event_data["top_score"],
},
}
(
Event.insert(event)
.on_conflict(
conflict_target=[Event.id],
update=event,
)
.execute()
)
# update the stored copy for comparison on future update messages
self.events_in_process[event_data["id"]] = event_data
if event_type == "end":
del self.events_in_process[event_data["id"]]
self.event_processed_queue.put((event_data["id"], camera))
class EventCleanup(threading.Thread):
def __init__(self, config: FrigateConfig, stop_event: MpEvent):
threading.Thread.__init__(self)
self.name = "event_cleanup"
self.config = config
self.stop_event = stop_event
self.camera_keys = list(self.config.cameras.keys())
def expire(self, media_type: str) -> None:
# TODO: Refactor media_type to enum
## Expire events from unlisted cameras based on the global config
if media_type == "clips":
retain_config = self.config.record.events.retain
file_extension = "mp4"
update_params = {"has_clip": False}
else:
retain_config = self.config.snapshots.retain
file_extension = "jpg"
update_params = {"has_snapshot": False}
distinct_labels = (
Event.select(Event.label)
.where(Event.camera.not_in(self.camera_keys))
.distinct()
)
# loop over object types in db
for l in distinct_labels:
# get expiration time for this label
expire_days = retain_config.objects.get(l.label, retain_config.default)
expire_after = (
datetime.datetime.now() - datetime.timedelta(days=expire_days)
).timestamp()
# grab all events after specific time
expired_events = Event.select().where(
Event.camera.not_in(self.camera_keys),
Event.start_time < expire_after,
Event.label == l.label,
Event.retain_indefinitely == False,
)
# delete the media from disk
for event in expired_events:
media_name = f"{event.camera}-{event.id}"
media_path = Path(
f"{os.path.join(CLIPS_DIR, media_name)}.{file_extension}"
)
media_path.unlink(missing_ok=True)
if file_extension == "jpg":
media_path = Path(
f"{os.path.join(CLIPS_DIR, media_name)}-clean.png"
)
media_path.unlink(missing_ok=True)
# update the clips attribute for the db entry
update_query = Event.update(update_params).where(
Event.camera.not_in(self.camera_keys),
Event.start_time < expire_after,
Event.label == l.label,
Event.retain_indefinitely == False,
)
update_query.execute()
## Expire events from cameras based on the camera config
for name, camera in self.config.cameras.items():
if media_type == "clips":
retain_config = camera.record.events.retain
else:
retain_config = camera.snapshots.retain
# get distinct objects in database for this camera
distinct_labels = (
Event.select(Event.label).where(Event.camera == name).distinct()
)
# loop over object types in db
for l in distinct_labels:
# get expiration time for this label
expire_days = retain_config.objects.get(l.label, retain_config.default)
expire_after = (
datetime.datetime.now() - datetime.timedelta(days=expire_days)
).timestamp()
# grab all events after specific time
expired_events = Event.select().where(
Event.camera == name,
Event.start_time < expire_after,
Event.label == l.label,
Event.retain_indefinitely == False,
)
# delete the grabbed clips from disk
for event in expired_events:
media_name = f"{event.camera}-{event.id}"
media_path = Path(
f"{os.path.join(CLIPS_DIR, media_name)}.{file_extension}"
)
media_path.unlink(missing_ok=True)
if file_extension == "jpg":
media_path = Path(
f"{os.path.join(CLIPS_DIR, media_name)}-clean.png"
)
media_path.unlink(missing_ok=True)
# update the clips attribute for the db entry
update_query = Event.update(update_params).where(
Event.camera == name,
Event.start_time < expire_after,
Event.label == l.label,
Event.retain_indefinitely == False,
)
update_query.execute()
def purge_duplicates(self) -> None:
duplicate_query = """with grouped_events as (
select id,
label,
camera,
has_snapshot,
has_clip,
row_number() over (
partition by label, camera, round(start_time/5,0)*5
order by end_time-start_time desc
) as copy_number
from event
)
select distinct id, camera, has_snapshot, has_clip from grouped_events
where copy_number > 1;"""
duplicate_events = Event.raw(duplicate_query)
for event in duplicate_events:
logger.debug(f"Removing duplicate: {event.id}")
media_name = f"{event.camera}-{event.id}"
media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}.jpg")
media_path.unlink(missing_ok=True)
media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}-clean.png")
media_path.unlink(missing_ok=True)
media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}.mp4")
media_path.unlink(missing_ok=True)
(
Event.delete()
.where(Event.id << [event.id for event in duplicate_events])
.execute()
)
def run(self) -> None:
# only expire events every 5 minutes
while not self.stop_event.wait(300):
self.expire("clips")
self.expire("snapshots")
self.purge_duplicates()
# drop events from db where has_clip and has_snapshot are false
delete_query = Event.delete().where(
Event.has_clip == False, Event.has_snapshot == False
)
delete_query.execute()
logger.info(f"Exiting event cleanup...")