90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
import datetime
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from sqlalchemy.inspection import inspect
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from szurubooru import db
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def get_tag_snapshot(tag):
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ret = {
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'names': [tag_name.name for tag_name in tag.names],
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'category': tag.category.name,
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'suggestions': sorted(rel.first_name for rel in tag.suggestions),
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'implications': sorted(rel.first_name for rel in tag.implications),
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}
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return ret
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def get_tag_category_snapshot(category):
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return {
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'name': category.name,
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'color': category.color,
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}
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# pylint: disable=invalid-name
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serializers = {
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'tag': get_tag_snapshot,
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'tag_category': get_tag_category_snapshot,
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}
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def get_resource_info(entity):
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table_name = entity.__table__.name
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primary_key = inspect(entity).identity
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assert table_name in serializers
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assert primary_key is not None
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assert len(primary_key) == 1
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primary_key = primary_key[0]
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return (table_name, primary_key)
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def get_snapshots(entity):
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table_name, primary_key = get_resource_info(entity)
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return db.session \
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.query(db.Snapshot) \
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.filter(db.Snapshot.resource_type == table_name) \
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.filter(db.Snapshot.resource_id == primary_key) \
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.order_by(db.Snapshot.creation_time.desc()) \
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.all()
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def get_data(entity):
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ret = []
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for snapshot in get_snapshots(entity):
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ret.append({'data': snapshot.data, 'time': snapshot.creation_time})
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return ret
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def save(operation, entity, auth_user):
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table_name, primary_key = get_resource_info(entity)
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now = datetime.datetime.now()
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snapshot = db.Snapshot()
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snapshot.creation_time = now
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snapshot.operation = operation
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snapshot.resource_type = table_name
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snapshot.resource_id = primary_key
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snapshot.data = serializers[table_name](entity)
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snapshot.user = auth_user
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earlier_snapshots = get_snapshots(entity)
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delta = datetime.timedelta(minutes=10)
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snapshots_left = len(earlier_snapshots)
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while earlier_snapshots:
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last_snapshot = earlier_snapshots.pop(0)
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is_fresh = now - last_snapshot.creation_time <= delta
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if snapshot.data != last_snapshot.data:
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if not is_fresh or last_snapshot.user != auth_user:
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break
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db.session.delete(last_snapshot)
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if snapshot.operation != db.Snapshot.OPERATION_DELETED:
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snapshot.operation = last_snapshot.operation
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snapshots_left -= 1
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if not snapshots_left and operation == db.Snapshot.OPERATION_DELETED:
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pass
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else:
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db.session.add(snapshot)
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def create(entity, auth_user):
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save(db.Snapshot.OPERATION_CREATED, entity, auth_user)
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def modify(entity, auth_user):
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save(db.Snapshot.OPERATION_MODIFIED, entity, auth_user)
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def delete(entity, auth_user):
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save(db.Snapshot.OPERATION_DELETED, entity, auth_user)
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