mirror of
https://github.com/craigerl/aprsd.git
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124 lines
3.6 KiB
Python
124 lines
3.6 KiB
Python
import logging
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import os
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import pathlib
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import pickle
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from oslo_config import cfg
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CONF = cfg.CONF
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LOG = logging.getLogger('APRSD')
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class ObjectStoreMixin:
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"""Class 'MIXIN' intended to save/load object data.
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The asumption of how this mixin is used:
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The using class has to have a:
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* data in self.data as a dictionary
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* a self.lock thread lock
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* Class must specify self.save_file as the location.
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When APRSD quits, it calls save()
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When APRSD Starts, it calls load()
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aprsd server -f (flush) will wipe all saved objects.
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"""
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# Child class must create the lock.
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lock = None
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def __len__(self):
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with self.lock:
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return len(self.data)
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def __iter__(self):
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with self.lock:
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return iter(self.data)
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def get_all(self):
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with self.lock:
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return self.data
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def get(self, key):
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with self.lock:
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return self.data.get(key)
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def copy(self):
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with self.lock:
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return self.data.copy()
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def _init_store(self):
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if not CONF.enable_save:
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return
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sl = CONF.save_location
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if not os.path.exists(sl):
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LOG.warning(f"Save location {sl} doesn't exist")
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try:
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os.makedirs(sl)
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except Exception as ex:
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LOG.exception(ex)
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def _save_filename(self):
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save_location = CONF.save_location
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return '{}/{}.p'.format(
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save_location,
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self.__class__.__name__.lower(),
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)
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def save(self):
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"""Save any queued to disk?"""
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if not CONF.enable_save:
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return
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self._init_store()
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save_filename = self._save_filename()
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if len(self) > 0:
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LOG.debug(
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f'{self.__class__.__name__}::Saving'
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f' {len(self)} entries to disk at '
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f'{save_filename}',
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)
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with self.lock:
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with open(save_filename, 'wb+') as fp:
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pickle.dump(self.data, fp)
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else:
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LOG.debug(
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"{} Nothing to save, flushing old save file '{}'".format(
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self.__class__.__name__,
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save_filename,
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),
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)
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self.flush()
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def load(self):
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if not CONF.enable_save:
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return
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with self.lock:
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if os.path.exists(self._save_filename()):
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try:
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with open(self._save_filename(), 'rb') as fp:
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raw = pickle.load(fp)
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if raw:
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self.data = raw
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LOG.debug(
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f'{self.__class__.__name__}::Loaded {len(self)} entries from disk.',
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)
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else:
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LOG.debug(f'{self.__class__.__name__}::No data to load.')
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except (pickle.UnpicklingError, Exception) as ex:
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LOG.error(f'Failed to UnPickle {self._save_filename()}')
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LOG.error(ex)
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self.data = {}
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else:
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LOG.debug(f'{self.__class__.__name__}::No save file found.')
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def flush(self):
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"""Nuke the old pickle file that stored the old results from last aprsd run."""
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if not CONF.enable_save:
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return
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with self.lock:
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if os.path.exists(self._save_filename()):
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pathlib.Path(self._save_filename()).unlink()
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with self.lock:
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self.data = {}
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