import datetime import itertools import logging import os import random import shutil import string import subprocess as sp import threading from pathlib import Path import psutil from peewee import JOIN, DoesNotExist from frigate.config import FrigateConfig from frigate.const import CACHE_DIR, RECORD_DIR from frigate.models import Event, Recordings logger = logging.getLogger(__name__) SECONDS_IN_DAY = 60 * 60 * 24 def remove_empty_directories(directory): # list all directories recursively and sort them by path, # longest first paths = sorted( [x[0] for x in os.walk(RECORD_DIR)], key=lambda p: len(str(p)), reverse=True, ) for path in paths: # don't delete the parent if path == RECORD_DIR: continue if len(os.listdir(path)) == 0: os.rmdir(path) class RecordingMaintainer(threading.Thread): def __init__(self, config: FrigateConfig, stop_event): threading.Thread.__init__(self) self.name = "recording_maint" self.config = config self.stop_event = stop_event def move_files(self): recordings = [ d for d in os.listdir(CACHE_DIR) if os.path.isfile(os.path.join(CACHE_DIR, d)) and d.endswith(".mp4") and not d.startswith("clip_") ] files_in_use = [] for process in psutil.process_iter(): try: if process.name() != "ffmpeg": continue flist = process.open_files() if flist: for nt in flist: if nt.path.startswith(CACHE_DIR): files_in_use.append(nt.path.split("/")[-1]) except: continue for f in recordings: # Skip files currently in use if f in files_in_use: continue cache_path = os.path.join(CACHE_DIR, f) basename = os.path.splitext(f)[0] camera, date = basename.rsplit("-", maxsplit=1) start_time = datetime.datetime.strptime(date, "%Y%m%d%H%M%S") # Just delete files if recordings are turned off if ( not camera in self.config.cameras or not self.config.cameras[camera].record.enabled ): Path(cache_path).unlink(missing_ok=True) continue ffprobe_cmd = [ "ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", f"{cache_path}", ] p = sp.run(ffprobe_cmd, capture_output=True) if p.returncode == 0: duration = float(p.stdout.decode().strip()) end_time = start_time + datetime.timedelta(seconds=duration) else: logger.warning(f"Discarding a corrupt recording segment: {f}") Path(cache_path).unlink(missing_ok=True) continue directory = os.path.join( RECORD_DIR, start_time.strftime("%Y-%m/%d/%H"), camera ) if not os.path.exists(directory): os.makedirs(directory) file_name = f"{start_time.strftime('%M.%S.mp4')}" file_path = os.path.join(directory, file_name) # copy then delete is required when recordings are stored on some network drives shutil.copyfile(cache_path, file_path) os.remove(cache_path) rand_id = "".join( random.choices(string.ascii_lowercase + string.digits, k=6) ) Recordings.create( id=f"{start_time.timestamp()}-{rand_id}", camera=camera, path=file_path, start_time=start_time.timestamp(), end_time=end_time.timestamp(), duration=duration, ) def run(self): # Check for new files every 5 seconds while not self.stop_event.wait(5): self.move_files() logger.info(f"Exiting recording maintenance...") class RecordingCleanup(threading.Thread): def __init__(self, config: FrigateConfig, stop_event): threading.Thread.__init__(self) self.name = "recording_cleanup" self.config = config self.stop_event = stop_event def clean_tmp_clips(self): # delete any clips more than 5 minutes old for p in Path("/tmp/cache").rglob("clip_*.mp4"): logger.debug(f"Checking tmp clip {p}.") if p.stat().st_mtime < (datetime.datetime.now().timestamp() - 60 * 1): logger.debug("Deleting tmp clip.") p.unlink(missing_ok=True) def expire_recordings(self): logger.debug("Start expire recordings (new).") logger.debug("Start deleted cameras.") # Handle deleted cameras expire_days = self.config.record.retain_days expire_before = ( datetime.datetime.now() - datetime.timedelta(days=expire_days) ).timestamp() no_camera_recordings: Recordings = Recordings.select().where( Recordings.camera.not_in(list(self.config.cameras.keys())), Recordings.end_time < expire_before, ) deleted_recordings = set() for recording in no_camera_recordings: Path(recording.path).unlink(missing_ok=True) deleted_recordings.add(recording.id) logger.debug(f"Expiring {len(deleted_recordings)} recordings") Recordings.delete().where(Recordings.id << deleted_recordings).execute() logger.debug("End deleted cameras.") logger.debug("Start all cameras.") for camera, config in self.config.cameras.items(): logger.debug(f"Start camera: {camera}.") # When deleting recordings without events, we have to keep at LEAST the configured max clip duration min_end = ( datetime.datetime.now() - datetime.timedelta(seconds=config.record.events.max_seconds) ).timestamp() expire_days = config.record.retain_days expire_before = ( datetime.datetime.now() - datetime.timedelta(days=expire_days) ).timestamp() expire_date = min(min_end, expire_before) # Get recordings to check for expiration recordings: Recordings = ( Recordings.select() .where( Recordings.camera == camera, Recordings.end_time < expire_date, ) .order_by(Recordings.start_time) ) # Get all the events to check against events: Event = ( Event.select() .where( Event.camera == camera, Event.end_time < expire_date, Event.has_clip ) .order_by(Event.start_time) .objects() ) # loop over recordings and see if they overlap with any non-expired events event_start = 0 deleted_recordings = set() for recording in recordings.objects().iterator(): keep = False # Now look for a reason to keep this recording segment for idx in range(event_start, len(events)): event = events[idx] # if the event starts in the future, stop checking events # and let this recording segment expire if event.start_time > recording.end_time: keep = False break # if the event ends after the recording starts, keep it # and stop looking at events if event.end_time >= recording.start_time: keep = True break # if the event ends before this recording segment starts, skip # this event and check the next event for an overlap. # since the events and recordings are sorted, we can skip events # that end before the previous recording segment started on future segments if event.end_time < recording.start_time: event_start = idx # Delete recordings outside of the retention window if not keep: Path(recording.path).unlink(missing_ok=True) deleted_recordings.add(recording.id) logger.debug(f"Expiring {len(deleted_recordings)} recordings") Recordings.delete().where(Recordings.id << deleted_recordings).execute() logger.debug(f"End camera: {camera}.") logger.debug("End all cameras.") logger.debug("End expire recordings (new).") def expire_files(self): logger.debug("Start expire files (legacy).") default_expire = ( datetime.datetime.now().timestamp() - SECONDS_IN_DAY * self.config.record.retain_days ) delete_before = {} for name, camera in self.config.cameras.items(): delete_before[name] = ( datetime.datetime.now().timestamp() - SECONDS_IN_DAY * camera.record.retain_days ) # find all the recordings older than the oldest recording in the db try: oldest_recording = ( Recordings.select().order_by(Recordings.start_time.desc()).get() ) oldest_timestamp = oldest_recording.start_time except DoesNotExist: oldest_timestamp = datetime.datetime.now().timestamp() logger.debug(f"Oldest recording in the db: {oldest_timestamp}") process = sp.run( ["find", RECORD_DIR, "-type", "f", "-newermt", f"@{oldest_timestamp}"], capture_output=True, text=True, ) files_to_check = process.stdout.splitlines() for f in files_to_check: p = Path(f) if p.stat().st_mtime < delete_before.get(p.parent.name, default_expire): p.unlink(missing_ok=True) logger.debug("End expire files (legacy).") def run(self): # Expire recordings every minute, clean directories every hour. for counter in itertools.cycle(range(60)): if self.stop_event.wait(60): logger.info(f"Exiting recording cleanup...") break self.expire_recordings() self.clean_tmp_clips() if counter == 0: self.expire_files() remove_empty_directories(RECORD_DIR)