99 lines
2.9 KiB
Python
99 lines
2.9 KiB
Python
import logging
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from dataclasses import dataclass
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from typing import Callable, List, Set
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from sqlalchemy import inspect, text
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from sqlalchemy.engine import Connection
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@dataclass(frozen=True)
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class Migration:
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id: str
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description: str
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upgrade: Callable[[Connection], None]
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def _ensure_migrations_table(connection: Connection) -> None:
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connection.execute(
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text(
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"""
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CREATE TABLE IF NOT EXISTS schema_migrations (
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id VARCHAR(255) PRIMARY KEY,
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applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
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)
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"""
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)
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)
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def _migration_0001_add_channel_subscription_fields(connection: Connection) -> None:
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inspector = inspect(connection)
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columns: Set[str] = {col["name"] for col in inspector.get_columns("users")}
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statements: List[str] = []
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if "channel_subscription_verified" not in columns:
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statements.append(
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"ALTER TABLE users ADD COLUMN channel_subscription_verified BOOLEAN"
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)
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if "channel_subscription_checked_at" not in columns:
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statements.append(
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"ALTER TABLE users ADD COLUMN channel_subscription_checked_at TIMESTAMPTZ"
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)
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if "channel_subscription_verified_for" not in columns:
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statements.append(
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"ALTER TABLE users ADD COLUMN channel_subscription_verified_for BIGINT"
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)
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for stmt in statements:
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connection.execute(text(stmt))
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MIGRATIONS: List[Migration] = [
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Migration(
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id="0001_add_channel_subscription_fields",
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description="Add columns to track required channel subscription verification",
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upgrade=_migration_0001_add_channel_subscription_fields,
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),
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]
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def run_database_migrations(connection: Connection) -> None:
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"""
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Apply pending migrations sequentially. Already applied revisions are skipped.
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"""
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_ensure_migrations_table(connection)
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applied_revisions: Set[str] = {
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row[0]
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for row in connection.execute(
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text("SELECT id FROM schema_migrations")
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)
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}
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for migration in MIGRATIONS:
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if migration.id in applied_revisions:
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continue
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logging.info(
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"Migrator: applying %s – %s", migration.id, migration.description
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)
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try:
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with connection.begin_nested():
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migration.upgrade(connection)
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connection.execute(
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text(
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"INSERT INTO schema_migrations (id) VALUES (:revision)"
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),
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{"revision": migration.id},
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)
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except Exception as exc:
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logging.error(
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"Migrator: failed to apply %s (%s)",
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migration.id,
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migration.description,
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exc_info=True,
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)
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raise exc
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else:
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logging.info("Migrator: migration %s applied successfully", migration.id)
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