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109 lines
3.1 KiB
Python
109 lines
3.1 KiB
Python
"""Alembic environment configuration."""
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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 engine_from_config, pool, text
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from meshcore_hub.common.models import Base
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# this is the Alembic Config object
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config = context.config
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# Interpret the config file for Python logging.
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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# Model's MetaData object for 'autogenerate' support
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target_metadata = Base.metadata
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def get_database_url() -> str:
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"""Get the PostgreSQL URL using the same resolution as the app.
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Delegates to CommonSettings.effective_database_url so the DATABASE_*
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components and an explicit DATABASE_URL are honoured identically to the
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running services.
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"""
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from meshcore_hub.common.config import CommonSettings
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return CommonSettings().effective_database_url
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def get_schema(url: str) -> str:
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"""Postgres schema to migrate into, or None for SQLite.
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Each Hub instance keeps its tables and alembic_version in its own schema so
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multiple instances (prod, stg, ...) can share one Postgres database with
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independent migration state.
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"""
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return os.environ.get("DATABASE_SCHEMA", "meshcorehub")
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def run_migrations_offline() -> None:
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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 = get_database_url()
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schema = get_schema(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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version_table_schema=schema,
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include_schemas=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() -> None:
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"""Run migrations in 'online' mode.
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In this scenario we need to create an Engine
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and associate a connection with the context.
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"""
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configuration = config.get_section(config.config_ini_section, {})
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url = get_database_url()
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configuration["sqlalchemy.url"] = url
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schema = get_schema(url)
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connectable = engine_from_config(
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configuration,
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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 connection:
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# Ensure the instance's schema exists and scope this connection to it
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# so tables (and alembic_version) are created there.
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connection.execute(text(f'CREATE SCHEMA IF NOT EXISTS "{schema}"'))
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connection.execute(text(f'SET search_path TO "{schema}"'))
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connection.commit()
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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version_table_schema=schema,
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include_schemas=True,
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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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