mirror of
https://github.com/Hestia-Homes/Model.git
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4daba1f7c5
First slice of the per-stage batch-transaction refactor (ADR-0012). A UnitOfWork is the single transaction a stage runs its batch in: a context manager exposing the DB repos bound to one session, committing once on `commit()` and rolling back on exception or exit-without-commit (all-or-nothing per batch, fail noisily). - `UnitOfWork` (port): `property` / `epc` / `solar` / `baseline` repos + `commit()` / `rollback()`; `__exit__` rolls back uncommitted work. - `PostgresUnitOfWork(session_factory)`: opens a Session from an injected factory (a module-scoped engine + sessionmaker in prod, so the pool is reused across warm invocations), binds the Postgres repos to it, closes on exit. Not yet wired into any orchestrator — that lands in the Baseline / Ingestion refactor slices. 3 tests against ephemeral PG (commit durable across units; exception rolls back; no-commit persists nothing). pyright strict clean; AAA. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
from __future__ import annotations
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from collections.abc import Callable
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from types import TracebackType
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from typing import Optional
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from sqlmodel import Session
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from repositories.baseline.baseline_postgres_repository import (
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BaselinePostgresRepository,
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)
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from repositories.epc.epc_postgres_repository import EpcPostgresRepository
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from repositories.property.property_postgres_repository import (
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PropertyPostgresRepository,
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)
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from repositories.solar.solar_postgres_repository import SolarPostgresRepository
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from repositories.unit_of_work import UnitOfWork
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class PostgresUnitOfWork(UnitOfWork):
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"""Postgres-backed Unit of Work: one ``Session``, all repos bound to it.
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Built from a session factory (a module-scoped engine + sessionmaker in
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production, ADR-0012) so the connection pool is reused across warm Lambda
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invocations. The session is opened on ``__enter__`` and closed on
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``__exit__``; a fresh instance is one single-use unit.
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"""
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def __init__(self, session_factory: Callable[[], Session]) -> None:
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self._session_factory = session_factory
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def __enter__(self) -> "PostgresUnitOfWork":
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self._session = self._session_factory()
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epc_repo = EpcPostgresRepository(self._session)
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self.property = PropertyPostgresRepository(self._session, epc_repo)
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self.epc = epc_repo
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self.solar = SolarPostgresRepository(self._session)
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self.baseline = BaselinePostgresRepository(self._session)
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return self
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def __exit__(
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self,
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exc_type: Optional[type[BaseException]],
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exc: Optional[BaseException],
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tb: Optional[TracebackType],
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) -> None:
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try:
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self._session.rollback()
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finally:
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self._session.close()
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def commit(self) -> None:
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self._session.commit()
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def rollback(self) -> None:
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self._session.rollback()
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