wehub-resource-sync
95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
"""Alembic environment configuration."""
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from __future__ import annotations
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import os
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from logging.config import fileConfig
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from alembic import context
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from sqlalchemy import Connection, engine_from_config, pool
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from omnigent.db import Base
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config = context.config
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if config.config_file_name is not None:
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# disable_existing_loggers=False prevents fileConfig from setting
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# disabled=True on loggers created before migration runs, which
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# would silently suppress all their output for the rest of the
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# process lifetime.
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fileConfig(config.config_file_name, disable_existing_loggers=False)
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# alembic.ini sets ``[logger_alembic] level = INFO`` for verbose
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# debugging during migration authoring. End-user runs of
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# ``omnigent run -p`` would otherwise dump 3 INFO lines
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# per fresh DB to stderr. Honor the CLI's ``--verbose`` toggle
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# by checking the root logger: when the root is not at DEBUG
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# (i.e. ``--verbose`` was NOT passed), pull alembic back to
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# WARNING so migrations are silent on the success path. Errors
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# still surface.
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import logging as _logging # local — env.py runs in alembic context
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if not _logging.getLogger().isEnabledFor(_logging.DEBUG):
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_logging.getLogger("alembic").setLevel(_logging.WARNING)
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target_metadata = Base.metadata
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# Allow overriding the DB URL via environment variable.
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db_url = os.environ.get("OMNIGENT_DB_URL")
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if db_url:
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config.set_main_option("sqlalchemy.url", db_url)
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def run_migrations_offline() -> None:
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"""
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Run migrations in 'offline' mode — emit SQL to stdout
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without connecting to the database.
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"""
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url = config.get_main_option("sqlalchemy.url")
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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"""
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Run migrations in 'online' mode — connect to the database
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and apply migrations directly.
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If a shared connection was passed via config.attributes (e.g.
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from _run_migrations in db/utils.py), reuse it instead of
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creating a new connection pool. This is required for SQLite
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in-memory databases and avoids redundant connections.
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"""
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connection = config.attributes.get("connection")
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if connection is not None:
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_run_with_connection(connection)
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else:
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connectable = engine_from_config(
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config.get_section(config.config_ini_section, {}),
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prefix="sqlalchemy.",
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poolclass=pool.NullPool,
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)
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with connectable.connect() as conn:
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_run_with_connection(conn)
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def _run_with_connection(connection: Connection) -> None:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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render_as_batch=True, # required for SQLite ALTER TABLE support
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)
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with context.begin_transaction():
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context.run_migrations()
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if context.is_offline_mode():
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run_migrations_offline()
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else:
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run_migrations_online()
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