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authentik/lifecycle/migrate.py

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#!/usr/bin/env python
"""System Migration handler"""
from importlib.util import module_from_spec, spec_from_file_location
from inspect import getmembers, isclass
from os import environ, system
from pathlib import Path
from typing import Any
from psycopg import Connection, Cursor, connect
from structlog.stdlib import get_logger
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from authentik.lib.config import CONFIG
LOGGER = get_logger()
ADV_LOCK_UID = 1000
LOCKED = False
class CommandError(Exception):
"""Error raised when a system_crit command fails"""
class BaseMigration:
"""Base System Migration"""
cur: Cursor
con: Connection
def __init__(self, cur: Any, con: Any):
self.cur = cur
self.con = con
def system_crit(self, command: str):
"""Run system command"""
LOGGER.debug("Running system_crit command", command=command)
retval = system(command) # nosec
if retval != 0:
raise CommandError("Migration error")
def fake_migration(self, *app_migration: tuple[str, str]):
"""Fake apply a list of migrations, arguments are
expected to be tuples of (app_label, migration_name)"""
for app, _migration in app_migration:
self.system_crit(f"./manage.py migrate {app} {_migration} --fake")
def needs_migration(self) -> bool:
"""Return true if Migration needs to be run"""
return False
def run(self):
"""Run the actual migration"""
def wait_for_lock(cursor: Cursor):
"""lock an advisory lock to prevent multiple instances from migrating at once"""
LOGGER.info("waiting to acquire database lock")
cursor.execute("SELECT pg_advisory_lock(%s)", (ADV_LOCK_UID,))
# pylint: disable=global-statement
global LOCKED
LOCKED = True
def release_lock(cursor: Cursor):
"""Release database lock"""
if not LOCKED:
return
cursor.execute("SELECT pg_advisory_unlock(%s)", (ADV_LOCK_UID,))
if __name__ == "__main__":
conn = connect(
dbname=CONFIG.get("postgresql.name"),
user=CONFIG.get("postgresql.user"),
password=CONFIG.get("postgresql.password"),
host=CONFIG.get("postgresql.host"),
port=CONFIG.get_int("postgresql.port"),
sslmode=CONFIG.get("postgresql.sslmode"),
sslrootcert=CONFIG.get("postgresql.sslrootcert"),
sslcert=CONFIG.get("postgresql.sslcert"),
sslkey=CONFIG.get("postgresql.sslkey"),
)
curr = conn.cursor()
try:
for migration_path in Path(__file__).parent.absolute().glob("system_migrations/*.py"):
spec = spec_from_file_location("lifecycle.system_migrations", migration_path)
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if not spec:
continue
mod = module_from_spec(spec)
spec.loader.exec_module(mod)
for name, sub in getmembers(mod, isclass):
if name != "Migration":
continue
migration = sub(curr, conn)
if migration.needs_migration():
wait_for_lock(curr)
LOGGER.info("Migration needs to be applied", migration=migration_path.name)
migration.run()
LOGGER.info("Migration finished applying", migration=migration_path.name)
release_lock(curr)
LOGGER.info("applying django migrations")
environ.setdefault("DJANGO_SETTINGS_MODULE", "authentik.root.settings")
wait_for_lock(curr)
try:
from django.core.management import execute_from_command_line
except ImportError as exc:
raise ImportError(
"Couldn't import Django. Are you sure it's installed and "
"available on your PYTHONPATH environment variable? Did you "
"forget to activate a virtual environment?"
) from exc
execute_from_command_line(["", "migrate"])
finally:
release_lock(curr)