blakeblackshear.frigate/frigate/events.py
2021-08-12 06:42:44 -05:00

255 lines
9.4 KiB
Python

import datetime
import logging
import os
import queue
import threading
import time
from pathlib import Path
from frigate.config import FrigateConfig, RecordConfig
from frigate.const import CLIPS_DIR
from frigate.models import Event, Recordings
from peewee import fn
logger = logging.getLogger(__name__)
class EventProcessor(threading.Thread):
def __init__(
self, config, camera_processes, event_queue, event_processed_queue, stop_event
):
threading.Thread.__init__(self)
self.name = "event_processor"
self.config = config
self.camera_processes = camera_processes
self.cached_clips = {}
self.event_queue = event_queue
self.event_processed_queue = event_processed_queue
self.events_in_process = {}
self.stop_event = stop_event
def should_create_clip(self, camera, event_data):
if event_data["false_positive"]:
return False
record_config: RecordConfig = self.config.cameras[camera].record
# Recording clips is disabled
if not record_config.enabled or (
record_config.retain_days == 0 and not record_config.events.enabled
):
return False
# If there are required zones and there is no overlap
required_zones = record_config.events.required_zones
if len(required_zones) > 0 and not set(event_data["entered_zones"]) & set(
required_zones
):
logger.debug(
f"Not creating clip for {event_data['id']} because it did not enter required zones"
)
return False
# If the required objects are not present
if (
record_config.events.objects is not None
and event_data["label"] not in record_config.events.objects
):
logger.debug(
f"Not creating clip for {event_data['id']} because it did not contain required objects"
)
return False
return True
def run(self):
while not self.stop_event.is_set():
try:
event_type, camera, event_data = self.event_queue.get(timeout=10)
except queue.Empty:
continue
logger.debug(f"Event received: {event_type} {camera} {event_data['id']}")
if event_type == "start":
self.events_in_process[event_data["id"]] = event_data
if event_type == "end":
record_config: RecordConfig = self.config.cameras[camera].record
has_clip = self.should_create_clip(camera, event_data)
if has_clip or event_data["has_snapshot"]:
Event.create(
id=event_data["id"],
label=event_data["label"],
camera=camera,
start_time=event_data["start_time"],
end_time=event_data["end_time"],
top_score=event_data["top_score"],
false_positive=event_data["false_positive"],
zones=list(event_data["entered_zones"]),
thumbnail=event_data["thumbnail"],
has_clip=has_clip,
has_snapshot=event_data["has_snapshot"],
)
del self.events_in_process[event_data["id"]]
self.event_processed_queue.put((event_data["id"], camera, has_clip))
logger.info(f"Exiting event processor...")
class EventCleanup(threading.Thread):
def __init__(self, config: FrigateConfig, stop_event):
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):
## Expire events from unlisted cameras based on the global config
if media_type == "clips":
retain_config = self.config.clips.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,
)
# 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,
)
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.clips.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,
)
# 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,
)
update_query.execute()
def purge_duplicates(self):
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}"
if event.has_snapshot:
media_path = Path(f"{os.path.join(CLIPS_DIR, media_name)}.jpg")
media_path.unlink(missing_ok=True)
if event.has_clip:
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):
# 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...")