Files
plm-lottery/app/rounds/service.py
T
davideandClaude Sonnet 5 f21ecbd4ee Add a cooldown between rounds (ROUND_COOLDOWN_SECONDS)
open_new_round_if_needed now withholds opening the next round until
ROUND_COOLDOWN_SECONDS (default 30) have passed since the previous
round's closed_at, returning None in that window instead of a Round.
Without this, the next round opened within one scheduler tick (~5s) of
the previous payout confirming — not enough time for a player to
notice the round they were in actually resolved.

Callers updated: the scheduler treats None as "nothing to do this
tick", and place_bet raises a "try again shortly" BetError instead of
crashing on a None round.

Not in the original flowchart — a deliberate UX addition on top of it,
documented as such in CLAUDE.md.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-21 11:29:59 +02:00

40 lines
1.7 KiB
Python

from datetime import datetime, timedelta, timezone
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from app.config import settings
from app.db.models import Round
_ACTIVE_STATUSES = ("open", "closing", "drawing", "paying_out")
async def get_active_round(session: AsyncSession) -> Round | None:
"""The round currently in progress (in any non-closed state), if any. Rounds
never overlap: a new round only opens once the previous one is fully closed
(payout confirmed, or no participants to pay out)."""
return await session.scalar(select(Round).where(Round.status.in_(_ACTIVE_STATUSES)).order_by(Round.id.desc()))
async def open_new_round_if_needed(session: AsyncSession) -> Round | None:
"""Returns the active round if one exists (whatever its status). Otherwise
opens a fresh one, unless the last closed round's cooldown (ROUND_COOLDOWN_SECONDS)
hasn't elapsed yet — in which case returns None. Callers that need to attach a
bet must additionally check the returned round's status == "open" — a round in
closing/drawing/paying_out isn't accepting new bets, but a new round can't open
until it's done."""
active = await get_active_round(session)
if active is not None:
return active
last_closed = await session.scalar(select(Round).where(Round.status == "closed").order_by(Round.id.desc()))
if last_closed is not None and last_closed.closed_at is not None:
closed_at = last_closed.closed_at.replace(tzinfo=timezone.utc)
if datetime.now(timezone.utc) < closed_at + timedelta(seconds=settings.round_cooldown_seconds):
return None
round_ = Round(status="open")
session.add(round_)
await session.flush()
return round_