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https://github.com/aljazceru/nutshell.git
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89fb2787e6
* relative import all the things * make format * add __init__.py to cli/ * fix mypy errors * get rid of more mypy * mypy fix crud.py * fix another mypy error
57 lines
2.1 KiB
Python
57 lines
2.1 KiB
Python
import re
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from ..core.db import COCKROACH, POSTGRES, SQLITE, Database
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def table_with_schema(db, table: str):
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return f"{db.references_schema if db.schema else ''}{table}"
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async def migrate_databases(db: Database, migrations_module):
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"""Creates the necessary databases if they don't exist already; or migrates them."""
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async def set_migration_version(conn, db_name, version):
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await conn.execute(
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f"""
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INSERT INTO {table_with_schema(db, 'dbversions')} (db, version) VALUES (?, ?)
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ON CONFLICT (db) DO UPDATE SET version = ?
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""",
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(db_name, version, version),
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)
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async def run_migration(db, migrations_module):
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db_name = migrations_module.__name__.split(".")[-2]
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for key, migrate in migrations_module.__dict__.items():
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match = matcher.match(key)
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if match:
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version = int(match.group(1))
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if version > current_versions.get(db_name, 0):
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await migrate(db)
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if db.schema == None:
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await set_migration_version(db, db_name, version)
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else:
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async with db.connect() as conn:
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await set_migration_version(conn, db_name, version)
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async with db.connect() as conn:
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exists = None
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if conn.type == SQLITE:
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exists = await conn.fetchone(
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f"SELECT * FROM sqlite_master WHERE type='table' AND name='{table_with_schema(db, 'dbversions')}'"
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)
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elif conn.type in {POSTGRES, COCKROACH}:
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exists = await conn.fetchone(
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f"SELECT * FROM information_schema.tables WHERE table_name = '{table_with_schema(db, 'dbversions')}'"
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)
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if not exists:
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await migrations_module.m000_create_migrations_table(conn)
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rows = await (
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await conn.execute(f"SELECT * FROM {table_with_schema(db, 'dbversions')}")
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).fetchall()
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current_versions = {row["db"]: row["version"] for row in rows}
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matcher = re.compile(r"^m(\d\d\d)_")
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await run_migration(db, migrations_module)
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