63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
"""
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migrations_tenant/env.py
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------------------------
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Standalone Alembic environment for running the EXISTING tenant migration chain
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(migrations/versions) against an ARBITRARY tenant database.
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Unlike migrations/env.py — which is Flask-Migrate-coupled and always targets
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the app's default database via current_app — this reads sqlalchemy.url straight
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from the Alembic config supplied per-tenant by control/tenant_migrate.py, and
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reuses the same version scripts through version_locations. No Flask import, so
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it can run for any tenant DB outside an app context.
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The normal `flask db ...` workflow is unaffected; it still uses migrations/env.py.
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"""
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from logging.config import fileConfig
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from sqlalchemy import create_engine, pool
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from alembic import context
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config = context.config
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# Only configure logging if an ini file was supplied (the runner builds the
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# Config programmatically, so this is typically skipped).
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if config.config_file_name is not None:
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try:
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fileConfig(config.config_file_name)
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except Exception:
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pass
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# Raw-SQL migrations with INFORMATION_SCHEMA guards — autogenerate is not used,
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# so no target metadata is required here.
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target_metadata = None
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def run_migrations_offline():
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context.configure(
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url=config.get_main_option('sqlalchemy.url'),
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target_metadata=target_metadata,
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literal_binds=True,
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compare_type=False,
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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():
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url = config.get_main_option('sqlalchemy.url')
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connectable = create_engine(url, poolclass=pool.NullPool, future=True)
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try:
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with connectable.connect() as connection:
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context.configure(connection=connection, target_metadata=target_metadata)
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with context.begin_transaction():
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context.run_migrations()
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finally:
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connectable.dispose()
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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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