60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
from datetime import datetime, timezone, timedelta
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from app.extensions import db
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# Lock expires after 15 minutes without heartbeat
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# Client sends heartbeat every 10 seconds and refreshes JWT every 10 minutes
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LOCK_TIMEOUT_MINUTES = 15
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class FileLock(db.Model):
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__tablename__ = 'file_locks'
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id = db.Column(db.Integer, primary_key=True)
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file_id = db.Column(db.Integer, db.ForeignKey('files.id'), unique=True, nullable=False, index=True)
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locked_by = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
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locked_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
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heartbeat_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
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client_info = db.Column(db.String(255), nullable=True) # e.g. "Desktop-Client Windows"
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file = db.relationship('File', backref=db.backref('lock', uselist=False))
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user = db.relationship('User', backref='file_locks')
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def is_expired(self):
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cutoff = datetime.now(timezone.utc) - timedelta(minutes=LOCK_TIMEOUT_MINUTES)
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return self.heartbeat_at.replace(tzinfo=timezone.utc) < cutoff
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def to_dict(self):
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return {
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'id': self.id,
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'file_id': self.file_id,
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'locked_by': self.locked_by,
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'locked_by_username': self.user.username if self.user else None,
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'locked_at': self.locked_at.isoformat() if self.locked_at else None,
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'heartbeat_at': self.heartbeat_at.isoformat() if self.heartbeat_at else None,
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'client_info': self.client_info,
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'is_expired': self.is_expired(),
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}
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@staticmethod
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def cleanup_expired():
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"""Remove all expired locks."""
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cutoff = datetime.now(timezone.utc) - timedelta(minutes=LOCK_TIMEOUT_MINUTES)
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expired = FileLock.query.filter(FileLock.heartbeat_at < cutoff).all()
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count = len(expired)
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for lock in expired:
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db.session.delete(lock)
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if count:
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db.session.commit()
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return count
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@staticmethod
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def get_lock(file_id):
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"""Get active (non-expired) lock for a file, cleaning up expired ones."""
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lock = FileLock.query.filter_by(file_id=file_id).first()
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if lock and lock.is_expired():
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db.session.delete(lock)
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db.session.commit()
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return None
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return lock
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