Add migration support with Alembic; implement migration scripts and configuration

2026-09-23 20:47:58 -07:00
parent c3ce9b88a2
commit 12485792d2
8 changed files with 357 additions and 1 deletions
@@ -0,0 +1,67 @@
+import os
+from alembic.config import Config
+from alembic.script import ScriptDirectory
+from alembic.runtime.migration import MigrationContext
+from alembic import command
+from sqlalchemy import create_engine
+from alembic import command
+from dotenv import load_dotenv
+import logging
+
+#Logging
+
+logging.basicConfig(
+    filename='app.log',  # Log to a file
+    level=logging.DEBUG,  # Log everything (DEBUG and above)
+    format='%(asctime)s %(levelname)s %(message)s'
+)
+
+logging.info('Application started')
+try:
+    logging.debug('Debug info here')
+except Exception as e:
+    logging.exception('An error occurred')
+
+
+load_dotenv()
+db_name = os.getenv("DB_NAME")
+db_psswd = os.getenv("DB_PASSWORD")
+db_user = os.getenv("DB_USER")
+db_port = os.getenv("DB_PORT") or "3306"
+db_host = os.getenv("DB_HOST")
+if db_host == None:
+    os._exit(1)
+engine_url = f"mariadb+mariadbconnector://{db_user}:{db_psswd}@{db_host}:{db_port}/{db_name}"
+
+base_dir = os.path.dirname(__file__)
+ini_path = os.path.join(base_dir, "..", "alembic.ini")
+alembic_cfg = Config(ini_path)
+alembic_cfg.set_section_option(alembic_cfg.config_ini_section, "sqlalchemy.url", engine_url)
+script = ScriptDirectory.from_config(alembic_cfg)
+
+engine = create_engine(engine_url)
+
+def check_db():
+    with engine.connect() as conn:
+        context = MigrationContext.configure(conn)
+        current_rev = context.get_current_revision()
+    head_rev = script.get_current_head()
+    if current_rev != head_rev:
+        command.upgrade(alembic_cfg, "head")
+        return False
+
+def auto_lookup():
+    command.revision(alembic_cfg, message="add tables and rows", autogenerate=True)
+    script = ScriptDirectory.from_config(alembic_cfg)
+    head_rev = script.get_revision(script.get_current_head())
+    with open(head_rev.path) as f:
+        content = f.read()
+    if "pass\n    # ### end Alembic commands ###" in content:
+        os.remove(head_rev.path)
+        command.stamp(alembic_cfg, "head")
+        logging.info("No changes DB detected")
+    else:
+        command.upgrade(alembic_cfg, "head")
+        logging.info("New DB changes, upgrade table")
+
+auto_lookup()