mirror of https://github.com/morpheus65535/bazarr
192 lines
6.0 KiB
Python
192 lines
6.0 KiB
Python
import logging
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from logging.config import fileConfig
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from sqlalchemy import MetaData
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from flask import current_app
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from alembic import context
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USE_TWOPHASE = False
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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(bind_key=None):
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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(bind=bind_key)
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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.engines.get(bind_key)
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def get_engine_url(bind_key=None):
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try:
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return get_engine(bind_key).url.render_as_string(
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hide_password=False).replace('%', '%%')
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except AttributeError:
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return str(get_engine(bind_key).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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bind_names = []
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if current_app.config.get('SQLALCHEMY_BINDS') is not None:
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bind_names = list(current_app.config['SQLALCHEMY_BINDS'].keys())
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else:
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get_bind_names = getattr(current_app.extensions['migrate'].db,
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'bind_names', None)
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if get_bind_names:
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bind_names = get_bind_names()
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for bind in bind_names:
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context.config.set_section_option(
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bind, "sqlalchemy.url", get_engine_url(bind_key=bind))
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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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def get_metadata(bind):
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"""Return the metadata for a bind."""
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if bind == '':
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bind = None
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if hasattr(target_db, 'metadatas'):
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return target_db.metadatas[bind]
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# legacy, less flexible implementation
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m = MetaData()
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for t in target_db.metadata.tables.values():
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if t.info.get('bind_key') == bind:
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t.tometadata(m)
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return m
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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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# for the --sql use case, run migrations for each URL into
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# individual files.
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engines = {
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'': {
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'url': context.config.get_main_option('sqlalchemy.url')
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}
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}
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for name in bind_names:
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engines[name] = rec = {}
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rec['url'] = context.config.get_section_option(name, "sqlalchemy.url")
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for name, rec in engines.items():
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logger.info("Migrating database %s" % (name or '<default>'))
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file_ = "%s.sql" % name
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logger.info("Writing output to %s" % file_)
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with open(file_, 'w') as buffer:
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context.configure(
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url=rec['url'],
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output_buffer=buffer,
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target_metadata=get_metadata(name),
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literal_binds=True,
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)
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with context.begin_transaction():
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context.run_migrations(engine_name=name)
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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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# this callback is used to prevent an auto-migration from being generated
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# when there are no changes to the schema
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# reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
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def process_revision_directives(context, revision, directives):
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if getattr(config.cmd_opts, 'autogenerate', False):
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script = directives[0]
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if len(script.upgrade_ops_list) >= len(bind_names) + 1:
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empty = True
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for upgrade_ops in script.upgrade_ops_list:
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if not upgrade_ops.is_empty():
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empty = False
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if empty:
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directives[:] = []
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logger.info('No changes in schema detected.')
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conf_args = current_app.extensions['migrate'].configure_args
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if conf_args.get("process_revision_directives") is None:
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conf_args["process_revision_directives"] = process_revision_directives
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# for the direct-to-DB use case, start a transaction on all
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# engines, then run all migrations, then commit all transactions.
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engines = {
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'': {'engine': get_engine()}
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}
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for name in bind_names:
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engines[name] = rec = {}
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rec['engine'] = get_engine(bind_key=name)
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for name, rec in engines.items():
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engine = rec['engine']
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rec['connection'] = conn = engine.connect()
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if USE_TWOPHASE:
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rec['transaction'] = conn.begin_twophase()
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else:
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rec['transaction'] = conn.begin()
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try:
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for name, rec in engines.items():
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logger.info("Migrating database %s" % (name or '<default>'))
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context.configure(
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connection=rec['connection'],
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upgrade_token="%s_upgrades" % name,
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downgrade_token="%s_downgrades" % name,
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target_metadata=get_metadata(name),
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**conf_args
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)
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context.run_migrations(engine_name=name)
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if USE_TWOPHASE:
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for rec in engines.values():
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rec['transaction'].prepare()
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for rec in engines.values():
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rec['transaction'].commit()
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except: # noqa: E722
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for rec in engines.values():
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rec['transaction'].rollback()
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raise
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finally:
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for rec in engines.values():
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rec['connection'].close()
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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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