90 lines
2.5 KiB
Python
90 lines
2.5 KiB
Python
import os
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from logging.config import fileConfig
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from sqlalchemy import engine_from_config
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from sqlalchemy import pool
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from sqlalchemy import create_engine
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from alembic import context
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from Schemas import *
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from Controllers.Postgres.engine import Base
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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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# Override sqlalchemy.url with environment variables if they exist
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db_host = os.getenv("POSTGRES_HOST", None)
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db_port = os.getenv("POSTGRES_PORT", None)
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db_user = os.getenv("POSTGRES_USER", None)
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db_password = os.getenv("POSTGRES_PASSWORD", None)
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db_name = os.getenv("POSTGRES_DB", None)
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# Build the connection URL from environment variables
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db_url = f"postgresql+psycopg2://{db_user}:{db_password}@{db_host}:{db_port}/{db_name}"
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# Override the sqlalchemy.url in the alembic.ini file
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config.set_main_option("sqlalchemy.url", db_url)
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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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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 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 = config.get_main_option("sqlalchemy.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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)
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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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connectable = 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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)
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with connectable.connect() as connection:
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context.configure(connection=connection, target_metadata=target_metadata)
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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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