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cdr, config and voicemail are all separate alembic trees. Because alembic's default is to use a table named 'alembic_version' to store the current tree revision, the 3 trees can't exist in the same schema without stepping on each other. Now each tree uses 'alembic_version_<tree_name>' as the version table. Each tree's env.py script now first checks for 'alembic_version'. If it finds it AND its revision is in the tree's history, the script renames it to 'alembic_version_<tree_name>'. Regardless, the script then continues with the migration using 'alembic_version_<tree_name>' and creates that table if it's not found. The result is that if an existing 'alembic_version' table was found but it didn't belong to this tree, it's left alone and 'alembic_version_<tree_name>' is used or created. WARNING: If multiple trees are using the same schema, they MUST NOT CRU or D any objects with names that might exist in the other trees. An example would be 'yesno_values' type. If two trees perform operations on it, one tree could pull it out from under the other. Thankfully we currently don't share any names among cdr, config and voicemail. NOTE: Since the env.py scripts in each tree were identical, a common env.py has been placed in the ast-db-manage directory and a symlink to it has been placed in each tree directory. ASTERISK-24311 #close Reported-by: Dafi Ni Change-Id: I4d593f000350deb5d21a14fa1e9bc3896844d898
141 lines
4.5 KiB
Python
Executable File
141 lines
4.5 KiB
Python
Executable File
from __future__ import with_statement
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from alembic import context
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from alembic.script import ScriptDirectory
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from alembic.operations import Operations
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from sqlalchemy import engine_from_config, pool
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from logging.config import fileConfig
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import logging
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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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try:
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fileConfig(config.config_file_name)
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except:
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pass
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logger = logging.getLogger('alembic.runtime.setup')
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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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target_metadata = None
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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 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(url=url)
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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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engine = 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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logger.info('Testing for an old alembic_version table.')
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connection = engine.connect()
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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='alembic_version'
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)
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script_location = config.get_main_option('script_location')
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found = False
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mc = context.get_context()
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current_db_revision = mc.get_current_revision()
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script = ScriptDirectory.from_config(config)
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""" If there was an existing alembic_version table, we need to
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check that it's current revision is in the history for the tree
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we're working with.
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"""
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for x in script.iterate_revisions('head', 'base'):
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if x.revision == current_db_revision:
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""" An alembic_versions table was found and it belongs to
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this alembic tree
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"""
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logger.info(
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('An old alembic_version table at revision %s was '
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'found for %s. Renaming to alembic_version_%s.'),
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current_db_revision, script_location,
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script_location)
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op = Operations(mc)
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try:
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with context.begin_transaction():
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op.rename_table(
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'alembic_version', 'alembic_version_%s'
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% script_location)
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found = True
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except:
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logger.error(('Unable to rename alembic_version to '
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'alembic_version_%s.'),
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script_location)
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connection.close()
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return
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break
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if not found:
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logger.info('Didn\'t find an old alembic_version table.')
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logger.info('Trying alembic_version_%s.' % script_location)
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""" We MAY have an alembic_version table that doesn't belong to
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this tree but if we still don't have an alembic_version_<tree>
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table, alembic will create it.
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"""
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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='alembic_version_' + script_location
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)
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mc = context.get_context()
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current_db_revision = mc.get_current_revision()
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if current_db_revision:
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logger.info(
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'Using the alembic_version_%s table at revision %s.',
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script_location, current_db_revision)
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else:
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logger.info('Creating new alembic_version_%s table.',
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script_location)
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try:
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with context.begin_transaction():
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context.run_migrations()
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finally:
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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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