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114 lines
3.2 KiB
Python
114 lines
3.2 KiB
Python
import logging
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import sys
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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
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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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if 'jupyterhub' in sys.modules:
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from traitlets.config import MultipleInstanceError
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from jupyterhub.app import JupyterHub
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app = None
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if JupyterHub.initialized():
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try:
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app = JupyterHub.instance()
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except MultipleInstanceError:
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# could have been another Application
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pass
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if app is not None:
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alembic_logger = logging.getLogger('alembic')
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alembic_logger.propagate = True
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alembic_logger.parent = app.log
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else:
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fileConfig(config.config_file_name, disable_existing_loggers=False)
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else:
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fileConfig(config.config_file_name)
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# add your model's MetaData object here for 'autogenerate' support
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from jupyterhub import orm
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target_metadata = orm.Base.metadata
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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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# pass these to context.configure(**config_opts)
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common_config_opts = dict(
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# target_metadata for autogenerate
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target_metadata=target_metadata,
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# transaction per migration to ensure
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# each migration is 'complete' before running the next one
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# (e.g. dropped tables)
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transaction_per_migration=True,
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)
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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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connectable = config.attributes.get('connection', None)
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config_opts = {}
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config_opts.update(common_config_opts)
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config_opts["literal_binds"] = True
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if connectable is None:
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config_opts["url"] = config.get_main_option("sqlalchemy.url")
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else:
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config_opts["connection"] = connectable
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context.configure(**config_opts)
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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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"""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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connectable = config.attributes.get('connection', None)
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config_opts = {}
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config_opts.update(common_config_opts)
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if connectable is None:
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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 connection:
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context.configure(
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connection=connection,
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**common_config_opts,
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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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