Fast IAAI implementation

alembic/env.py

@@ -0,0 +1,85 @@
+from __future__ import annotations
+
+import os
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool, text
+
+from iaai_sync_service.models import Base
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+SYNC_VERSION_TABLE = "iaai_sync_alembic_version"
+LEGACY_VERSION_TABLE = "alembic_version"
+SYNC_REVISIONS = {
+    "0001_ensure_sync_schema",
+    "0002_extend_origin_enum_for_iaai",
+    "0003_create_iaai_source_tables",
+}
+
+
+def _normalize_database_url(url: str) -> str:
+    normalized = url.strip()
+    if normalized.startswith("jdbc:"):
+        normalized = normalized[len("jdbc:") :]
+    if normalized.startswith("postgres://"):
+        normalized = "postgresql+psycopg://" + normalized[len("postgres://") :]
+    elif normalized.startswith("postgresql://"):
+        normalized = "postgresql+psycopg://" + normalized[len("postgresql://") :]
+    return normalized
+
+
+def _database_url() -> str:
+    raw_url = os.getenv("DATABASE_URL", config.get_main_option("sqlalchemy.url"))
+    return _normalize_database_url(raw_url)
+
+
+def _select_version_table(connection) -> str:  # noqa: ANN001
+    inspector = connection.dialect
+    if inspector.has_table(connection, SYNC_VERSION_TABLE):
+        return SYNC_VERSION_TABLE
+    if inspector.has_table(connection, LEGACY_VERSION_TABLE):
+        version_num = connection.execute(text(f"SELECT version_num FROM {LEGACY_VERSION_TABLE} LIMIT 1")).scalar()
+        if version_num in SYNC_REVISIONS:
+            return LEGACY_VERSION_TABLE
+    return SYNC_VERSION_TABLE
+
+
+def run_migrations_offline() -> None:
+    url = _database_url()
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        version_table=SYNC_VERSION_TABLE,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    configuration = config.get_section(config.config_ini_section) or {}
+    configuration["sqlalchemy.url"] = _database_url()
+    connectable = engine_from_config(configuration, prefix="sqlalchemy.", poolclass=pool.NullPool)
+
+    with connectable.connect() as connection:
+        version_table = _select_version_table(connection)
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            version_table=version_table,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()