134 lines
3.9 KiB
Python
134 lines
3.9 KiB
Python
import logging
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from logging.config import fileConfig
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from flask import current_app
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from alembic import context
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from sqlalchemy import NullPool, engine_from_config, text
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from common.models.user import Tenant
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import pgvector
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from pgvector.sqlalchemy import Vector
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# this is the Alembic Config object, which provides
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# access to the values within the .ini file in use.
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config = context.config
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# Interpret the config file for Python logging.
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# This line sets up loggers basically.
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fileConfig(config.config_file_name)
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logger = logging.getLogger('alembic.env')
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def get_engine():
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try:
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# this works with Flask-SQLAlchemy<3 and Alchemical
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return current_app.extensions['migrate'].db.get_engine()
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except (TypeError, AttributeError):
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# this works with Flask-SQLAlchemy>=3
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return current_app.extensions['migrate'].db.engine
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def get_engine_url():
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try:
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return get_engine().url.render_as_string(hide_password=False).replace(
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'%', '%%')
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except AttributeError:
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return str(get_engine().url).replace('%', '%%')
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# add your model's MetaData object here
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# for 'autogenerate' support
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# from myapp import mymodel
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# target_metadata = mymodel.Base.metadata
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config.set_main_option('sqlalchemy.url', get_engine_url())
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target_db = current_app.extensions['migrate'].db
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# other values from the config, defined by the needs of env.py,
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# can be acquired:
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# my_important_option = config.get_main_option("my_important_option")
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# ... etc.
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# List of Tenants
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tenants_ = Tenant.query.all()
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if tenants_:
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tenants = [tenant.id for tenant in tenants_]
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else:
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tenants = []
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def get_metadata():
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if hasattr(target_db, 'metadatas'):
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return target_db.metadatas[None]
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return target_db.metadata
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def run_migrations_offline():
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"""Run migrations in 'offline' mode.
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This configures the context with just a URL
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and not an Engine, though an Engine is acceptable
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here as well. By skipping the Engine creation
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we don't even need a DBAPI to be available.
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Calls to context.execute() here emit the given string to the
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script output.
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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, target_metadata=get_metadata(), literal_binds=True
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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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"""Updated migration script for handling schema based multi-tenancy
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ref:
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- https://alembic.sqlalchemy.org/en/latest/cookbook.html#rudimental-schema-level-multi-tenancy-for-postgresql-databases # noqa
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"""
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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=NullPool,
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)
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with connectable.connect() as connection:
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print(tenants)
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for tenant in tenants:
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logger.info(f"Migrating tenant: {tenant}")
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# set search path on the connection, which ensures that
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# PostgreSQL will emit all CREATE / ALTER / DROP statements
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# in terms of this schema by default
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connection.execute(text(f'SET search_path TO "{tenant}"'))
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# in SQLAlchemy v2+ the search path change needs to be committed
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connection.commit()
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# make use of non-supported SQLAlchemy attribute to ensure
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# the dialect reflects tables in terms of the current tenant name
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connection.dialect.default_schema_name = tenant
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context.configure(
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connection=connection,
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target_metadata=get_metadata(),
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)
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with context.begin_transaction():
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context.run_migrations()
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# for checking migrate or upgrade is running
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if getattr(config.cmd_opts, "autogenerate", False):
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break
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if context.is_offline_mode():
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raise Exception("Offline migrations are not supported")
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else:
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run_migrations_online()
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