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authentik/lifecycle/migrate.py

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#!/usr/bin/env python
"""System Migration handler"""
import os
from importlib.util import module_from_spec, spec_from_file_location
from inspect import getmembers, isclass
from pathlib import Path
from typing import Any
from psycopg2 import connect
from structlog.stdlib import get_logger
2020-12-05 21:08:42 +00:00
from authentik.lib.config import CONFIG
LOGGER = get_logger()
ADV_LOCK_UID = 1000
LOCKED = False
class BaseMigration:
"""Base System Migration"""
cur: Any
con: Any
def __init__(self, cur: Any, con: Any):
self.cur = cur
self.con = con
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():
"""lock an advisory lock to prevent multiple instances from migrating at once"""
LOGGER.info("waiting to acquire database lock")
curr.execute("SELECT pg_advisory_lock(%s)", (ADV_LOCK_UID,))
# pylint: disable=global-statement
global LOCKED
LOCKED = True
def release_lock():
"""Release database lock"""
if not LOCKED:
return
curr.execute("SELECT pg_advisory_unlock(%s)", (ADV_LOCK_UID,))
if __name__ == "__main__":
conn = connect(
dbname=CONFIG.y("postgresql.name"),
user=CONFIG.y("postgresql.user"),
password=CONFIG.y("postgresql.password"),
host=CONFIG.y("postgresql.host"),
port=int(CONFIG.y("postgresql.port")),
)
curr = conn.cursor()
try:
for migration in Path(__file__).parent.absolute().glob("system_migrations/*.py"):
spec = spec_from_file_location("lifecycle.system_migrations", migration)
mod = module_from_spec(spec)
# pyright: reportGeneralTypeIssues=false
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()
LOGGER.info("Migration needs to be applied", migration=sub)
migration.run()
LOGGER.info("Migration finished applying", migration=sub)
release_lock()
LOGGER.info("applying django migrations")
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "authentik.root.settings")
wait_for_lock()
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()