mirror of
https://github.com/mail-in-a-box/mailinabox.git
synced 2025-04-03 00:07:05 +00:00
93 lines
2.6 KiB
Python
93 lines
2.6 KiB
Python
#####
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##### This file is part of Mail-in-a-Box-LDAP which is released under the
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##### terms of the GNU Affero General Public License as published by the
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##### Free Software Foundation, either version 3 of the License, or (at
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##### your option) any later version. See file LICENSE or go to
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##### https://github.com/downtownallday/mailinabox-ldap for full license
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##### details.
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#####
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from .ReadPositionStore import ReadPositionStore
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import threading
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import json
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import os
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import logging
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log = logging.getLogger(__name__)
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class ReadPositionStoreInFile(ReadPositionStore):
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def __init__(self, output_file):
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self.output_file = output_file
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self.changed = False
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self.lock = threading.Lock()
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self.interrupt = threading.Event()
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if os.path.exists(output_file):
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with open(output_file, "r", encoding="utf-8") as fp:
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self.db = json.loads(fp.read())
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else:
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self.db = {}
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self.t = threading.Thread(
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target=self._persist_bg,
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name="ReadPositionStoreInFile",
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daemon=True
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)
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self.t.start()
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def __del__(self):
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self.interrupt.set()
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def stop(self):
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self.interrupt.set()
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self.t.join()
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def get(self, file, inode):
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with self.lock:
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if file in self.db and str(inode) in self.db[file]:
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return self.db[file][str(inode)]
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return 0
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def save(self, file, inode, pos):
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with self.lock:
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if not file in self.db:
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self.db[file] = { str(inode):pos }
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else:
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self.db[file][str(inode)] = pos
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self.changed = True
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def clear(self, file):
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with self.lock:
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self.db[file] = {}
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self.changed = True
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def persist(self):
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if self.changed:
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try:
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with open(self.output_file, "w") as fp:
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with self.lock:
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json_str = json.dumps(self.db)
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self.changed = False
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try:
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fp.write(json_str)
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except Exception as e:
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with self.lock:
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self.changed = True
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log.error(e)
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except Exception as e:
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log.error(e)
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def _persist_bg(self):
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while not self.interrupt.is_set():
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# wait 60 seconds before persisting
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self.interrupt.wait(60)
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# even if interrupted, persist one final time
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self.persist()
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