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import os
import re
import shutil
import logging
from typing import Optional, Union, List
from datetime import datetime
from ..util import strgen
logger = logging.getLogger(__name__)
# record file
# -----------
class RecordFile:
EXTENSION = None
start_time: Optional[datetime]
stop_time: Optional[datetime]
record_id: Optional[int]
name: str
file_id: Optional[str]
remote: bool
remote_filesize: int
storage_root: str
human_date_dmt = '%d.%m.%y'
human_time_fmt = '%H:%M:%S'
@staticmethod
def create(filename: str, *args, **kwargs):
if filename.endswith(f'.{SoundRecordFile.EXTENSION}'):
return SoundRecordFile(filename, *args, **kwargs)
elif filename.endswith(f'.{CameraRecordFile.EXTENSION}'):
return CameraRecordFile(filename, *args, **kwargs)
else:
raise RuntimeError(f'unsupported file extension: {filename}')
def __init__(self, filename: str, remote=False, remote_filesize=None, storage_root='/'):
if self.EXTENSION is None:
raise RuntimeError('this is abstract class')
self.name = filename
self.storage_root = storage_root
self.remote = remote
self.remote_filesize = remote_filesize
m = re.match(r'^(\d{6}-\d{6})_(\d{6}-\d{6})_id(\d+)(_\w+)?\.'+self.EXTENSION+'$', filename)
if m:
self.start_time = datetime.strptime(m.group(1), RecordStorage.time_fmt)
self.stop_time = datetime.strptime(m.group(2), RecordStorage.time_fmt)
self.record_id = int(m.group(3))
self.file_id = (m.group(1) + '_' + m.group(2)).replace('-', '_')
else:
logger.warning(f'unexpected filename: {filename}')
self.start_time = None
self.stop_time = None
self.record_id = None
self.file_id = None
@property
def path(self):
if self.remote:
return RuntimeError('remote recording, can\'t get real path')
return os.path.realpath(os.path.join(
self.storage_root, self.name
))
@property
def start_humantime(self) -> str:
if self.start_time is None:
return '?'
fmt = f'{RecordFile.human_date_dmt} {RecordFile.human_time_fmt}'
return self.start_time.strftime(fmt)
@property
def stop_humantime(self) -> str:
if self.stop_time is None:
return '?'
fmt = RecordFile.human_time_fmt
if self.start_time.date() != self.stop_time.date():
fmt = f'{RecordFile.human_date_dmt} {fmt}'
return self.stop_time.strftime(fmt)
@property
def start_unixtime(self) -> int:
if self.start_time is None:
return 0
return int(self.start_time.timestamp())
@property
def stop_unixtime(self) -> int:
if self.stop_time is None:
return 0
return int(self.stop_time.timestamp())
@property
def filesize(self):
if self.remote:
if self.remote_filesize is None:
raise RuntimeError('file is remote and remote_filesize is not set')
return self.remote_filesize
return os.path.getsize(self.path)
def __dict__(self) -> dict:
return {
'start_unixtime': self.start_unixtime,
'stop_unixtime': self.stop_unixtime,
'filename': self.name,
'filesize': self.filesize,
'fileid': self.file_id,
'record_id': self.record_id or 0,
}
class PseudoRecordFile(RecordFile):
EXTENSION = 'null'
def __init__(self):
super().__init__('pseudo.null')
@property
def filesize(self):
return 0
class SoundRecordFile(RecordFile):
EXTENSION = 'mp3'
class CameraRecordFile(RecordFile):
EXTENSION = 'mp4'
# record storage
# --------------
class RecordStorage:
EXTENSION = None
time_fmt = '%d%m%y-%H%M%S'
def __init__(self, root: str):
if self.EXTENSION is None:
raise RuntimeError('this is abstract class')
self.root = root
def getfiles(self, as_objects=False) -> Union[List[str], List[RecordFile]]:
files = []
for name in os.listdir(self.root):
path = os.path.join(self.root, name)
if os.path.isfile(path) and name.endswith(f'.{self.EXTENSION}'):
files.append(name if not as_objects else RecordFile.create(name, storage_root=self.root))
return files
def find(self, file_id: str) -> Optional[RecordFile]:
for name in os.listdir(self.root):
if os.path.isfile(os.path.join(self.root, name)) and name.endswith(f'.{self.EXTENSION}'):
item = RecordFile.create(name, storage_root=self.root)
if item.file_id == file_id:
return item
return None
def purge(self):
files = self.getfiles()
if files:
logger = logging.getLogger(self.__name__)
for f in files:
try:
path = os.path.join(self.root, f)
logger.debug(f'purge: deleting {path}')
os.unlink(path)
except OSError as exc:
logger.exception(exc)
def delete(self, file: RecordFile):
os.unlink(file.path)
def save(self,
fn: str,
record_id: int,
start_time: int,
stop_time: int) -> RecordFile:
start_time_s = datetime.fromtimestamp(start_time).strftime(self.time_fmt)
stop_time_s = datetime.fromtimestamp(stop_time).strftime(self.time_fmt)
dst_fn = f'{start_time_s}_{stop_time_s}_id{record_id}'
if os.path.exists(os.path.join(self.root, dst_fn)):
dst_fn += strgen(4)
dst_fn += f'.{self.EXTENSION}'
dst_path = os.path.join(self.root, dst_fn)
shutil.move(fn, dst_path)
return RecordFile.create(dst_fn, storage_root=self.root)
class SoundRecordStorage(RecordStorage):
EXTENSION = 'mp3'
class ESP32CameraRecordStorage(RecordStorage):
EXTENSION = 'jpg' # not used anyway
def save(self, *args, **kwargs):
return PseudoRecordFile()
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