Add migration services
This commit is contained in:
Urtzi Alfaro
405
shared/database/init_manager.py
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405
shared/database/init_manager.py
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"""
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Database Initialization Manager
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Handles automatic table creation and Alembic integration for both:
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1. Production deployments (first-time table creation)
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2. Development workflows (reset to clean slate)
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"""
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import os
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import asyncio
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import structlog
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from typing import Optional, List, Dict, Any
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from pathlib import Path
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from sqlalchemy import text, inspect
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from sqlalchemy.ext.asyncio import AsyncSession
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from alembic.config import Config
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from alembic import command
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from alembic.runtime.migration import MigrationContext
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from alembic.script import ScriptDirectory
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from .base import DatabaseManager, Base
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logger = structlog.get_logger()
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class DatabaseInitManager:
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"""
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Manages database initialization with support for:
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- Automatic table creation from SQLAlchemy models
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- Alembic integration and version management
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- Development reset capabilities
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"""
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def __init__(
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self,
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database_manager: DatabaseManager,
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service_name: str,
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alembic_ini_path: Optional[str] = None,
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models_module: Optional[str] = None,
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force_recreate: bool = False
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):
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self.database_manager = database_manager
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self.service_name = service_name
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self.alembic_ini_path = alembic_ini_path
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self.models_module = models_module
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self.force_recreate = force_recreate
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self.logger = logger.bind(service=service_name)
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async def initialize_database(self) -> Dict[str, Any]:
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"""
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Main initialization method that handles all scenarios:
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1. Check if database exists and has tables
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2. Create tables if needed (first-time deployment)
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3. Handle Alembic version management
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4. Support development reset scenarios
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"""
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self.logger.info("Starting database initialization")
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try:
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# Check current database state
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db_state = await self._check_database_state()
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self.logger.info("Database state checked", state=db_state)
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# Handle different initialization scenarios
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if self.force_recreate:
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result = await self._handle_force_recreate()
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elif db_state["is_empty"]:
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result = await self._handle_first_time_deployment()
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elif db_state["has_alembic_version"]:
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result = await self._handle_existing_database_with_alembic()
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else:
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result = await self._handle_existing_database_without_alembic()
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self.logger.info("Database initialization completed", result=result)
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return result
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except Exception as e:
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self.logger.error("Database initialization failed", error=str(e))
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raise
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async def _check_database_state(self) -> Dict[str, Any]:
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"""Check the current state of the database"""
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state = {
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"is_empty": False,
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"has_alembic_version": False,
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"existing_tables": [],
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"alembic_version": None
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}
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try:
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async with self.database_manager.get_session() as session:
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# Check if database has any tables
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inspector = await self._get_inspector(session)
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existing_tables = await self._get_existing_tables(inspector)
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state["existing_tables"] = existing_tables
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state["is_empty"] = len(existing_tables) == 0
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# Check if alembic_version table exists and has version
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if "alembic_version" in existing_tables:
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state["has_alembic_version"] = True
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result = await session.execute(text("SELECT version_num FROM alembic_version"))
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version = result.scalar()
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state["alembic_version"] = version
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except Exception as e:
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self.logger.warning("Error checking database state", error=str(e))
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state["is_empty"] = True
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return state
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async def _handle_first_time_deployment(self) -> Dict[str, Any]:
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"""Handle first-time deployment: create tables and set up Alembic"""
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self.logger.info("Handling first-time deployment")
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# Import models to ensure they're registered with Base
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if self.models_module:
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await self._import_models()
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# Create all tables from SQLAlchemy models
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await self._create_tables_from_models()
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# Initialize Alembic and stamp with the latest version
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if self.alembic_ini_path and os.path.exists(self.alembic_ini_path):
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await self._initialize_alembic()
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return {
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"action": "first_time_deployment",
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"tables_created": True,
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"alembic_initialized": True,
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"message": "Database initialized for first-time deployment"
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}
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async def _handle_force_recreate(self) -> Dict[str, Any]:
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"""Handle development scenario: drop everything and recreate"""
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self.logger.info("Handling force recreate (development mode)")
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# Drop all tables
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await self._drop_all_tables()
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# Create tables from models
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if self.models_module:
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await self._import_models()
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await self._create_tables_from_models()
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# Re-initialize Alembic
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if self.alembic_ini_path and os.path.exists(self.alembic_ini_path):
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await self._initialize_alembic()
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return {
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"action": "force_recreate",
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"tables_dropped": True,
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"tables_created": True,
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"alembic_reinitialized": True,
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"message": "Database recreated from scratch (development mode)"
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}
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async def _handle_existing_database_with_alembic(self) -> Dict[str, Any]:
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"""Handle existing database with Alembic version management"""
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self.logger.info("Handling existing database with Alembic")
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# Run pending migrations
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if self.alembic_ini_path and os.path.exists(self.alembic_ini_path):
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await self._run_migrations()
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return {
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"action": "existing_with_alembic",
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"migrations_run": True,
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"message": "Existing database updated with pending migrations"
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}
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async def _handle_existing_database_without_alembic(self) -> Dict[str, Any]:
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"""Handle existing database without Alembic (legacy scenario)"""
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self.logger.info("Handling existing database without Alembic")
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# Initialize Alembic on existing database
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if self.alembic_ini_path and os.path.exists(self.alembic_ini_path):
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await self._initialize_alembic_on_existing()
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return {
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"action": "existing_without_alembic",
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"alembic_initialized": True,
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"message": "Alembic initialized on existing database"
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}
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async def _import_models(self):
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"""Import models module to ensure models are registered with Base"""
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try:
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import importlib
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import sys
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from pathlib import Path
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# Add project root to Python path if not already there
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project_root = Path(__file__).parent.parent.parent
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if str(project_root) not in sys.path:
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sys.path.insert(0, str(project_root))
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# Try to import the models module
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try:
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importlib.import_module(self.models_module)
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self.logger.info("Models imported successfully", module=self.models_module)
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except ImportError as import_error:
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# Try alternative import path (from app directly)
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alt_module = f"app.models"
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self.logger.warning("Primary import failed, trying alternative",
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primary=self.models_module,
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alternative=alt_module,
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error=str(import_error))
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# Change working directory to service directory
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import os
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original_cwd = os.getcwd()
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service_dir = project_root / "services" / self.service_name
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if service_dir.exists():
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os.chdir(service_dir)
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try:
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importlib.import_module(alt_module)
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self.logger.info("Models imported with alternative path", module=alt_module)
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finally:
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os.chdir(original_cwd)
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else:
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raise import_error
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except Exception as e:
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self.logger.error("Failed to import models", module=self.models_module, error=str(e))
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# Don't raise for now, continue without models import
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self.logger.warning("Continuing without models import - tables may not be created")
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async def _create_tables_from_models(self):
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"""Create all tables from registered SQLAlchemy models"""
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try:
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async with self.database_manager.async_engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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self.logger.info("Tables created from SQLAlchemy models")
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except Exception as e:
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self.logger.error("Failed to create tables from models", error=str(e))
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raise
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async def _drop_all_tables(self):
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"""Drop all tables (for development reset)"""
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try:
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async with self.database_manager.async_engine.begin() as conn:
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await conn.run_sync(Base.metadata.drop_all)
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self.logger.info("All tables dropped")
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except Exception as e:
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self.logger.error("Failed to drop tables", error=str(e))
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raise
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async def _initialize_alembic(self):
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"""Initialize Alembic and stamp with latest version"""
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try:
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def run_alembic_init():
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# Create Alembic config
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alembic_cfg = Config(self.alembic_ini_path)
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# Get the latest revision
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script_dir = ScriptDirectory.from_config(alembic_cfg)
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latest_revision = script_dir.get_current_head()
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if latest_revision:
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# Stamp the database with the latest revision
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command.stamp(alembic_cfg, latest_revision)
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return latest_revision
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return None
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# Run Alembic operations in async executor
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latest_revision = await asyncio.get_event_loop().run_in_executor(None, run_alembic_init)
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if latest_revision:
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self.logger.info("Alembic initialized and stamped", revision=latest_revision)
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else:
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self.logger.warning("No Alembic revisions found")
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except Exception as e:
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self.logger.error("Failed to initialize Alembic", error=str(e))
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raise
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async def _initialize_alembic_on_existing(self):
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"""Initialize Alembic on an existing database"""
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try:
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def run_alembic_stamp():
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alembic_cfg = Config(self.alembic_ini_path)
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script_dir = ScriptDirectory.from_config(alembic_cfg)
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latest_revision = script_dir.get_current_head()
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if latest_revision:
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command.stamp(alembic_cfg, latest_revision)
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return latest_revision
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return None
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# Run Alembic operations in async executor
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latest_revision = await asyncio.get_event_loop().run_in_executor(None, run_alembic_stamp)
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if latest_revision:
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self.logger.info("Alembic initialized on existing database", revision=latest_revision)
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except Exception as e:
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self.logger.error("Failed to initialize Alembic on existing database", error=str(e))
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raise
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async def _run_migrations(self):
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"""Run pending Alembic migrations"""
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try:
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def run_alembic_upgrade():
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alembic_cfg = Config(self.alembic_ini_path)
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command.upgrade(alembic_cfg, "head")
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# Run Alembic operations in async executor
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await asyncio.get_event_loop().run_in_executor(None, run_alembic_upgrade)
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self.logger.info("Alembic migrations completed")
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except Exception as e:
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self.logger.error("Failed to run migrations", error=str(e))
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raise
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async def _get_inspector(self, session: AsyncSession):
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"""Get SQLAlchemy inspector for the current connection"""
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def get_inspector_sync(connection):
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return inspect(connection)
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connection = await session.connection()
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return await connection.run_sync(get_inspector_sync)
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async def _get_existing_tables(self, inspector) -> List[str]:
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"""Get list of existing tables in the database"""
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def get_tables_sync(connection):
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insp = inspect(connection)
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return insp.get_table_names()
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async with self.database_manager.get_session() as session:
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connection = await session.connection()
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return await connection.run_sync(get_tables_sync)
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def create_init_manager(
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database_manager: DatabaseManager,
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service_name: str,
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service_path: Optional[str] = None,
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force_recreate: bool = False
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) -> DatabaseInitManager:
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"""
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Factory function to create a DatabaseInitManager with auto-detected paths
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Args:
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database_manager: DatabaseManager instance
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service_name: Name of the service
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service_path: Path to service directory (auto-detected if None)
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force_recreate: Whether to force recreate tables (development mode)
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"""
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# Auto-detect paths if not provided
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if service_path is None:
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# Try Docker container path first (service files at root level)
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if os.path.exists("alembic.ini"):
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service_path = "."
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else:
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# Fallback to development path
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service_path = f"services/{service_name}"
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# Set up paths based on environment
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if service_path == ".":
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# Docker container environment
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alembic_ini_path = "alembic.ini"
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models_module = "app.models"
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else:
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# Development environment
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alembic_ini_path = f"{service_path}/alembic.ini"
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models_module = f"services.{service_name}.app.models"
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# Check if paths exist
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if not os.path.exists(alembic_ini_path):
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logger.warning("Alembic config not found", path=alembic_ini_path)
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alembic_ini_path = None
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return DatabaseInitManager(
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database_manager=database_manager,
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service_name=service_name,
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alembic_ini_path=alembic_ini_path,
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models_module=models_module,
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force_recreate=force_recreate
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)
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async def initialize_service_database(
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database_manager: DatabaseManager,
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service_name: str,
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force_recreate: bool = False
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) -> Dict[str, Any]:
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"""
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Convenience function for service database initialization
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Args:
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database_manager: DatabaseManager instance
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service_name: Name of the service
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force_recreate: Whether to force recreate (development mode)
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Returns:
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Dict with initialization results
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"""
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init_manager = create_init_manager(
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database_manager=database_manager,
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service_name=service_name,
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force_recreate=force_recreate
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)
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return await init_manager.initialize_database()
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