"""Order execution service (REQ-013, REQ-014, REQ-018, dcy-003, dcy-004). A single background execution loop (invariant A single writer, invariant B single broker session) that, per tick: dispatch: claim pending slots with broker_order_id IS NULL (option A queue), submit the order, record broker_order_id (idempotency guard). poll: observe fills on dispatched pending slots and transition the slot (pending_buy->holding / pending_sell->closed), or roll back on reject. On a successful fill, enqueue a LedgerWorkItem (slot transition is kept ON the critical path; the ledger write is eventually-consistent via a separate writer — REQ-019). reconcile() re-polls dispatched slots on restart so a crash after dispatch converges without duplicate orders (REQ-014). All slot writes go through SlotService (advisory lock). The broker is touched only here, never by the domain or the HTTP API. The ledger outbox is the single producer for ledger work items (NFR-3, single record subject). """ from __future__ import annotations from dataclasses import dataclass from datetime import datetime, timezone from typing import Optional from trex_core.application.broker_port import BrokerPort, OrderRequest from trex_core.application.ledger_outbox import LedgerOutbox from trex_core.application.ledger_port import LedgerTrade from trex_core.domain.slot import SlotService, SlotState, SlotStateMismatchError _MAX_DISPATCH_PER_TICK = 64 @dataclass class ExecutionResult: dispatched: int = 0 filled: int = 0 rolled_back: int = 0 ledger_enqueued: int = 0 # REQ-019: ledger work items appended this tick ledger_skipped: int = 0 # REQ-018 AC-4: fills without portfolio_id class ExecutionService: def __init__( self, slot_service: SlotService, repo, broker: BrokerPort, ledger_outbox: Optional[LedgerOutbox] = None, ) -> None: self._svc = slot_service self._repo = repo self._broker = broker self._ledger_outbox = ledger_outbox # ------------------------------------------------------------ def run_once(self) -> ExecutionResult: r = ExecutionResult() self._dispatch(r) self._poll(r) return r def reconcile(self) -> ExecutionResult: """Restart recovery: re-poll dispatched-but-pending slots (REQ-014). Undispatched pending slots (broker_order_id IS NULL) are simply picked up by the next dispatch, so a crash before dispatch causes no duplicate. """ r = ExecutionResult() self._poll(r) return r # ------------------------------------------------------------ def _dispatch(self, r: ExecutionResult) -> None: for _ in range(_MAX_DISPATCH_PER_TICK): slot = self._repo.find_pending_for_dispatch() if slot is None: return side = "buy" if slot.status is SlotState.PENDING_BUY else "sell" qty = int(slot.qty or 0) limit = int(slot.entry_price) if slot.entry_price else None ack = self._broker.submit_order( OrderRequest( slot_id=str(slot.slot_id), side=side, symbol=slot.symbol or "", qty=qty, limit_price=limit, order_type="00" if limit is not None else "01", ) ) if ack.accepted and ack.broker_order_id: self._repo.mark_dispatched(slot.slot_id, ack.broker_order_id) r.dispatched += 1 else: self._rollback(slot, reason=ack.reason or "order_rejected") r.rolled_back += 1 def _poll(self, r: ExecutionResult) -> None: for slot in self._repo.list_dispatched_pending(): side = "buy" if slot.status is SlotState.PENDING_BUY else "sell" fs = self._broker.poll_fill(slot.broker_order_id, side=side, symbol=slot.symbol or "") if fs.is_filled: self._on_filled(slot, fs, side, r) r.filled += 1 elif fs.is_terminal_reject: self._rollback(slot, reason=f"order_{fs.state}") r.rolled_back += 1 # accepted / partially_filled -> leave for next tick # ------------------------------------------------------------ def _on_filled(self, slot, fs, side: str, r: ExecutionResult) -> None: broker_order_id = slot.broker_order_id # captured BEFORE clear_dispatch try: if slot.status is SlotState.PENDING_BUY: self._svc.transit_slot( slot.slot_id, SlotState.PENDING_BUY, SlotState.HOLDING, reason="buy_filled", actor="execution_loop", avg_price=fs.avg_price, qty=float(fs.filled_qty) or slot.qty, ) else: # PENDING_SELL self._svc.transit_slot( slot.slot_id, SlotState.PENDING_SELL, SlotState.CLOSED, reason="sell_filled", actor="execution_loop", ) except SlotStateMismatchError: return # slot moved concurrently; next tick reconciles # REQ-018: enqueue ledger work item AFTER the slot transition is durable. # Slot transition is the critical path; ledger write is async (REQ-019). self._record_ledger(slot, fs, side, broker_order_id, r) self._repo.clear_dispatch(slot.slot_id) # done with this order def _record_ledger(self, slot, fs, side: str, broker_order_id: str, r: ExecutionResult) -> None: """Append a LedgerWorkItem for the just-filled trade (REQ-018 + REQ-019).""" if self._ledger_outbox is None: return if not slot.portfolio_id: # REQ-018 AC-4: slot transition still proceeded; record skip for ops. r.ledger_skipped += 1 return if fs.execution_id is None: # Broker contract regression — log via counter; slot already transitioned. r.ledger_skipped += 1 return price = float(fs.avg_price) if fs.avg_price is not None else 0.0 trade = LedgerTrade( asset_id=str(slot.portfolio_id), order_id=str(broker_order_id), execution_id=str(fs.execution_id), side=side, qty=float(fs.filled_qty), price=price, fee=float(fs.fee), tax=float(fs.tax), executed_at=datetime.now(tz=timezone.utc), ) self._ledger_outbox.enqueue(trade) r.ledger_enqueued += 1 def _rollback(self, slot, *, reason: str) -> None: try: if slot.status is SlotState.PENDING_BUY: self._svc.transit_slot( slot.slot_id, SlotState.PENDING_BUY, SlotState.IDLE, reason=reason, actor="execution_loop", ) # idle reset clears broker_order_id in the domain else: # PENDING_SELL rejected -> back to holding, clear order for re-dispatch self._svc.transit_slot( slot.slot_id, SlotState.PENDING_SELL, SlotState.HOLDING, reason=reason, actor="execution_loop", ) self._repo.clear_dispatch(slot.slot_id) except SlotStateMismatchError: return