188 lines
8.3 KiB
Python
188 lines
8.3 KiB
Python
import logging
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import secrets
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from datetime import datetime, timedelta, timezone
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy.future import select
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from sqlalchemy.orm import selectinload
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from sqlalchemy import delete
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from sqlalchemy.exc import SQLAlchemyError, OperationalError, IntegrityError
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from typing import Optional
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from app.models import Invite as InviteModel, Group as GroupModel, User as UserModel
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from app.core.exceptions import (
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DatabaseConnectionError,
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DatabaseIntegrityError,
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DatabaseQueryError,
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DatabaseTransactionError,
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InviteOperationError
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)
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logger = logging.getLogger(__name__)
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MAX_CODE_GENERATION_ATTEMPTS = 5
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async def deactivate_all_active_invites_for_group(db: AsyncSession, group_id: int):
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"""Deactivates all currently active invite codes for a specific group."""
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try:
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async with db.begin_nested() if db.in_transaction() else db.begin():
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stmt = (
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select(InviteModel)
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.where(InviteModel.group_id == group_id, InviteModel.is_active == True)
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)
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result = await db.execute(stmt)
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active_invites = result.scalars().all()
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if not active_invites:
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return
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for invite in active_invites:
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invite.is_active = False
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db.add(invite)
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await db.flush()
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except OperationalError as e:
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logger.error(f"Database connection error deactivating invites for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseConnectionError(f"DB connection error deactivating invites for group {group_id}: {str(e)}")
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except SQLAlchemyError as e:
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logger.error(f"Unexpected SQLAlchemy error deactivating invites for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseTransactionError(f"DB transaction error deactivating invites for group {group_id}: {str(e)}")
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async def create_invite(db: AsyncSession, group_id: int, creator_id: int, expires_in_days: int = 365 * 100) -> Optional[InviteModel]:
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"""Creates a new invite code for a group, deactivating any existing active ones for that group first."""
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try:
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async with db.begin_nested() if db.in_transaction() else db.begin():
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await deactivate_all_active_invites_for_group(db, group_id)
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expires_at = datetime.now(timezone.utc) + timedelta(days=expires_in_days)
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potential_code = None
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for attempt in range(MAX_CODE_GENERATION_ATTEMPTS):
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potential_code = secrets.token_urlsafe(16)
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existing_check_stmt = select(InviteModel.id).where(InviteModel.code == potential_code, InviteModel.is_active == True).limit(1)
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existing_result = await db.execute(existing_check_stmt)
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if existing_result.scalar_one_or_none() is None:
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break
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if attempt == MAX_CODE_GENERATION_ATTEMPTS - 1:
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raise InviteOperationError("Failed to generate a unique invite code after several attempts.")
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final_check_stmt = select(InviteModel.id).where(InviteModel.code == potential_code, InviteModel.is_active == True).limit(1)
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final_check_result = await db.execute(final_check_stmt)
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if final_check_result.scalar_one_or_none() is not None:
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raise InviteOperationError("Invite code collision detected just before creation attempt.")
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db_invite = InviteModel(
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code=potential_code,
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group_id=group_id,
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created_by_id=creator_id,
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expires_at=expires_at,
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is_active=True
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)
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db.add(db_invite)
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await db.flush()
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stmt = (
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select(InviteModel)
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.where(InviteModel.id == db_invite.id)
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.options(
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selectinload(InviteModel.group),
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selectinload(InviteModel.creator)
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)
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)
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result = await db.execute(stmt)
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loaded_invite = result.scalar_one_or_none()
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if loaded_invite is None:
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raise InviteOperationError("Failed to load invite after creation and flush.")
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return loaded_invite
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except InviteOperationError:
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raise
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except IntegrityError as e:
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logger.error(f"Database integrity error during invite creation for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseIntegrityError(f"Failed to create invite due to DB integrity issue: {str(e)}")
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except OperationalError as e:
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logger.error(f"Database connection error during invite creation for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseConnectionError(f"DB connection error during invite creation: {str(e)}")
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except SQLAlchemyError as e:
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logger.error(f"Unexpected SQLAlchemy error during invite creation for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseTransactionError(f"DB transaction error during invite creation: {str(e)}")
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async def get_active_invite_for_group(db: AsyncSession, group_id: int) -> Optional[InviteModel]:
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"""Gets the currently active and non-expired invite for a specific group."""
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now = datetime.now(timezone.utc)
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try:
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stmt = (
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select(InviteModel).where(
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InviteModel.group_id == group_id,
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InviteModel.is_active == True,
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InviteModel.expires_at > now
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)
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.limit(1)
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.options(
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selectinload(InviteModel.group),
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selectinload(InviteModel.creator)
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)
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)
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result = await db.execute(stmt)
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return result.scalars().first()
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except OperationalError as e:
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logger.error(f"Database connection error fetching active invite for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseConnectionError(f"DB connection error fetching active invite for group {group_id}: {str(e)}")
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except SQLAlchemyError as e:
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logger.error(f"DB query error fetching active invite for group {group_id}: {str(e)}", exc_info=True)
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raise DatabaseQueryError(f"DB query error fetching active invite for group {group_id}: {str(e)}")
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async def get_active_invite_by_code(db: AsyncSession, code: str) -> Optional[InviteModel]:
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"""Gets an active and non-expired invite by its code."""
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now = datetime.now(timezone.utc)
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try:
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stmt = (
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select(InviteModel).where(
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InviteModel.code == code,
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InviteModel.is_active == True,
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InviteModel.expires_at > now
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)
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.options(
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selectinload(InviteModel.group),
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selectinload(InviteModel.creator)
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)
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)
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result = await db.execute(stmt)
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return result.scalars().first()
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except OperationalError as e:
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raise DatabaseConnectionError(f"DB connection error fetching invite: {str(e)}")
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except SQLAlchemyError as e:
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raise DatabaseQueryError(f"DB query error fetching invite: {str(e)}")
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async def deactivate_invite(db: AsyncSession, invite: InviteModel) -> InviteModel:
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"""Marks an invite as inactive (used) and reloads with relationships."""
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try:
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async with db.begin_nested() if db.in_transaction() else db.begin() as transaction:
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invite.is_active = False
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db.add(invite)
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await db.flush()
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stmt = (
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select(InviteModel)
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.where(InviteModel.id == invite.id)
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.options(
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selectinload(InviteModel.group),
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selectinload(InviteModel.creator)
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)
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)
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result = await db.execute(stmt)
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updated_invite = result.scalar_one_or_none()
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if updated_invite is None:
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raise InviteOperationError("Failed to load invite after deactivation.")
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return updated_invite
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except OperationalError as e:
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logger.error(f"Database connection error deactivating invite: {str(e)}", exc_info=True)
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raise DatabaseConnectionError(f"DB connection error deactivating invite: {str(e)}")
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except SQLAlchemyError as e:
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logger.error(f"Unexpected SQLAlchemy error deactivating invite: {str(e)}", exc_info=True)
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raise DatabaseTransactionError(f"DB transaction error deactivating invite: {str(e)}")
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