Luke Mino-Altherr
153 lines
4.0 KiB
Python
153 lines
4.0 KiB
Python
import sqlalchemy as sa
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from sqlalchemy import select
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from sqlalchemy.dialects import sqlite
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from sqlalchemy.orm import Session
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from app.assets.database.models import Asset, AssetReference
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from app.assets.database.queries.common import MAX_BIND_PARAMS, calculate_rows_per_statement, iter_chunks
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def asset_exists_by_hash(
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session: Session,
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asset_hash: str,
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) -> bool:
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"""
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Check if an asset with a given hash exists in database.
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"""
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row = (
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session.execute(
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select(sa.literal(True))
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.select_from(Asset)
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.where(Asset.hash == asset_hash)
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.limit(1)
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)
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).first()
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return row is not None
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def get_asset_by_hash(
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session: Session,
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asset_hash: str,
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) -> Asset | None:
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return (
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(session.execute(select(Asset).where(Asset.hash == asset_hash).limit(1)))
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.scalars()
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.first()
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)
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def upsert_asset(
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session: Session,
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asset_hash: str,
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size_bytes: int,
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mime_type: str | None = None,
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) -> tuple[Asset, bool, bool]:
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"""Upsert an Asset by hash. Returns (asset, created, updated)."""
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vals = {"hash": asset_hash, "size_bytes": int(size_bytes)}
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if mime_type:
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vals["mime_type"] = mime_type
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ins = (
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sqlite.insert(Asset)
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.values(**vals)
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.on_conflict_do_nothing(index_elements=[Asset.hash])
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)
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res = session.execute(ins)
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created = int(res.rowcount or 0) > 0
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asset = (
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session.execute(select(Asset).where(Asset.hash == asset_hash).limit(1))
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.scalars()
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.first()
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)
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if not asset:
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raise RuntimeError("Asset row not found after upsert.")
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updated = False
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if not created:
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changed = False
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if asset.size_bytes != int(size_bytes) and int(size_bytes) > 0:
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asset.size_bytes = int(size_bytes)
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changed = True
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if mime_type and not asset.mime_type:
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asset.mime_type = mime_type
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changed = True
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if changed:
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updated = True
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return asset, created, updated
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def create_stub_asset(
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session: Session,
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size_bytes: int,
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mime_type: str | None = None,
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) -> Asset:
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"""Create a new asset with no hash (stub for later enrichment)."""
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asset = Asset(size_bytes=size_bytes, mime_type=mime_type, hash=None)
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session.add(asset)
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session.flush()
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return asset
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def bulk_insert_assets(
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session: Session,
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rows: list[dict],
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) -> None:
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"""Bulk insert Asset rows with ON CONFLICT DO NOTHING on hash."""
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if not rows:
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return
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ins = sqlite.insert(Asset).on_conflict_do_nothing(index_elements=[Asset.hash])
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for chunk in iter_chunks(rows, calculate_rows_per_statement(5)):
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session.execute(ins, chunk)
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def get_existing_asset_ids(
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session: Session,
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asset_ids: list[str],
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) -> set[str]:
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"""Return the subset of asset_ids that exist in the database."""
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if not asset_ids:
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return set()
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found: set[str] = set()
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for chunk in iter_chunks(asset_ids, MAX_BIND_PARAMS):
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rows = session.execute(
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select(Asset.id).where(Asset.id.in_(chunk))
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).fetchall()
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found.update(row[0] for row in rows)
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return found
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def update_asset_hash_and_mime(
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session: Session,
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asset_id: str,
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asset_hash: str | None = None,
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mime_type: str | None = None,
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) -> bool:
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"""Update asset hash and/or mime_type. Returns True if asset was found."""
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asset = session.get(Asset, asset_id)
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if not asset:
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return False
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if asset_hash is not None:
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asset.hash = asset_hash
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if mime_type is not None and not asset.mime_type:
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asset.mime_type = mime_type
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return True
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def reassign_asset_references(
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session: Session,
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from_asset_id: str,
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to_asset_id: str,
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reference_id: str,
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) -> None:
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"""Reassign a reference from one asset to another.
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Used when merging a stub asset into an existing asset with the same hash.
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"""
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ref = session.get(AssetReference, reference_id)
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if ref and ref.asset_id == from_asset_id:
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ref.asset_id = to_asset_id
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session.flush()
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