8a378c8d69
- Introduced `alembic.ini` for Alembic configuration, enabling structured database migrations. - Created `database/migrations/env.py` to manage migration environment and database URL retrieval. - Added migration script template `database/migrations/script.py.mako` for generating migration scripts. - Updated `.gitignore` to exclude migration versions from version control. - Enhanced `setup.md` documentation to include details on the migration system and commands for managing migrations.
135 lines
3.9 KiB
Python
135 lines
3.9 KiB
Python
"""
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Alembic Environment Configuration for Crypto Trading Bot Platform
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"""
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import os
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import sys
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from logging.config import fileConfig
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from pathlib import Path
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from sqlalchemy import engine_from_config
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from sqlalchemy import pool
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from alembic import context
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# Add project root to path for imports
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project_root = Path(__file__).parent.parent.parent
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sys.path.insert(0, str(project_root))
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# Load environment variables from .env file if it exists
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try:
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from dotenv import load_dotenv
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env_file = project_root / '.env'
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if env_file.exists():
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load_dotenv(env_file)
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except ImportError:
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# dotenv not available, proceed without it
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pass
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# Import our models and database configuration
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from database.models import Base
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from database.connection import DatabaseConfig
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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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if config.config_file_name is not None:
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fileConfig(config.config_file_name)
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# add your model's MetaData object here
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# for 'autogenerate' support
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target_metadata = Base.metadata
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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_database_url():
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"""Get database URL from environment variables"""
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# Use DATABASE_URL if set, otherwise construct from individual components
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url = os.getenv('DATABASE_URL')
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if url:
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return url
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# Fallback to constructing URL from components
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user = os.getenv('POSTGRES_USER', 'dashboard')
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password = os.getenv('POSTGRES_PASSWORD', '')
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host = os.getenv('POSTGRES_HOST', 'localhost')
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port = os.getenv('POSTGRES_PORT', '5434')
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database = os.getenv('POSTGRES_DB', 'dashboard')
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return f"postgresql://{user}:{password}@{host}:{port}/{database}"
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def run_migrations_offline() -> None:
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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 = get_database_url()
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context.configure(
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url=url,
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target_metadata=target_metadata,
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literal_binds=True,
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dialect_opts={"paramstyle": "named"},
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compare_type=True,
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compare_server_default=True,
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render_as_batch=False, # PostgreSQL supports transactional DDL
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)
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with context.begin_transaction():
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context.run_migrations()
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def run_migrations_online() -> None:
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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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# Override the sqlalchemy.url in the config with our environment-based URL
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config.set_main_option("sqlalchemy.url", get_database_url())
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# Create engine with our database configuration
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db_config = DatabaseConfig()
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engine_config = config.get_section(config.config_ini_section)
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engine_config.update(db_config.get_engine_kwargs())
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connectable = engine_from_config(
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engine_config,
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prefix="sqlalchemy.",
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poolclass=pool.NullPool, # Use NullPool for migrations to avoid connection issues
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)
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with connectable.connect() as connection:
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context.configure(
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connection=connection,
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target_metadata=target_metadata,
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compare_type=True,
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compare_server_default=True,
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render_as_batch=False, # PostgreSQL supports transactional DDL
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transaction_per_migration=True, # Each migration in its own transaction
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)
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with context.begin_transaction():
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context.run_migrations()
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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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