Pass our manually mapped reqid: int to EMS

Since we seem to always be able to get back the `reqid`/`userref` value
we send to kraken ws endpoints, we can use this as our brokerd side
order id and avoid all race cases with getting the true `txid` value
that `kraken` assigns (and which changes when you do "edits"
:eyeroll:). This simplifies status updates by allowing our relay loop
just to pass back our generated `.reqid` verbatim and allows responding
with a `BrokerdOrderAck` immediately in the request handler task which
should guarantee there are no further race conditions with the relay
loop and mapping `txid`s from kraken.. and figuring out wtf to do when
they change, etc.

piker/brokers/kraken/broker.py

@@ -98,7 +98,7 @@ async def handle_order_requests(
         log.info(f'Rx order msg:\n{pformat(msg)}')
         match msg:
             case {
-                'account': 'kraken.spot',
+                'account': 'kraken.spot' as account,
                 'action': action,
             } if action in {'buy', 'sell'}:
 
@@ -120,7 +120,7 @@ async def handle_order_requests(
                     reqid = next(counter)
                     ids[order.oid] = reqid
                     log.debug(
-                        f"GENERATED ORDER {reqid}\n"
+                        f"Adding order {reqid}\n"
                         f'{ids}'
                     )
                     extra = {
@@ -149,11 +149,18 @@ async def handle_order_requests(
                 log.info(f'Submitting WS order request:\n{pformat(req)}')
                 await ws.send_msg(req)
 
+                resp = BrokerdOrderAck(
+                    oid=order.oid,  # ems order request id
+                    reqid=reqid,  # our custom int mapping
+                    account=account,  # piker account
+                )
+                await ems_order_stream.send(resp)
+
                 # placehold for sanity checking in relay loop
                 emsflow.setdefault(order.oid, []).append(order)
 
             case {
-                'account': 'kraken.spot',
+                'account': 'kraken.spot' as account,
                 'action': 'cancel',
             }:
                 cancel = BrokerdCancel(**msg)
@@ -369,6 +376,8 @@ async def handle_order_updates(
             case [
                 trades_msgs,
                 'ownTrades',
+                # won't exist for historical values?
+                # 'userref': reqid,
                 {'sequence': seq},
             ]:
                 # flatten msgs for processing
@@ -382,8 +391,12 @@ async def handle_order_updates(
                 }
                 for tid, trade in trades.items():
 
-                    # parse-cast
-                    reqid = trade['ordertxid']
+                    # NOTE: try to get the requid sent in the order
+                    # request message if posssible; it may not be
+                    # provided since this sub also returns generic
+                    # historical trade events.
+                    reqid = trade.get('userref', trade['ordertxid'])
+
                     action = trade['type']
                     price = float(trade['price'])
                     size = float(trade['vol'])
@@ -392,6 +405,7 @@ async def handle_order_updates(
                     # send a fill msg for gui update
                     fill_msg = BrokerdFill(
                         reqid=reqid,
+
                         time_ns=time.time_ns(),
 
                         action=action,
@@ -540,7 +554,7 @@ async def handle_order_updates(
                             # order state updates
                             resp = BrokerdStatus(
 
-                                reqid=txid,
+                                reqid=reqid,
                                 time_ns=time.time_ns(),  # cuz why not
                                 account=f'kraken.{acctid}',
 
@@ -598,9 +612,10 @@ async def handle_order_updates(
                 #         'txid': [last.reqid],  # txid from submission
                 #     })
 
-                msgs.extend(resps)
-                for resp in resps:
-                    await ems_stream.send(resp.dict())
+                if resps:
+                    msgs.extend(resps)
+                    for resp in resps:
+                        await ems_stream.send(resp.dict())
 
             case _:
                 log.warning(f'Unhandled trades update msg: {msg}')
@@ -635,7 +650,7 @@ def process_status(
             resp = BrokerdError(
                 oid=oid,
                 # XXX: use old reqid in case it changed?
-                reqid=last.reqid,
+                reqid=reqid,
                 symbol=getattr(last, 'symbol', 'N/A'),
 
                 reason=f'Failed {action}:\n{errmsg}',
@@ -657,12 +672,7 @@ def process_status(
                 f're-mapped reqid: {reqid}\n'
                 f'txid: {txid}\n'
             )
-            resp = BrokerdOrderAck(
-                oid=oid,  # ems order request id
-                reqid=txid,  # kraken unique order id
-                account=last.account,  # piker account
-            )
-            return [resp], False
+            return [], False
 
         case {
             'event': 'editOrderStatus',
@@ -680,12 +690,7 @@ def process_status(
                 f'{descr}'
             )
             # deliver another ack to update the ems-side `.reqid`.
-            resp = BrokerdOrderAck(
-                oid=oid,  # ems order request id
-                reqid=txid,  # kraken unique order id
-                account=last.account,  # piker account
-            )
-            return [resp], False
+            return [], False
 
         case {
             "event": "cancelOrderStatus",
@@ -701,7 +706,7 @@ def process_status(
             resps: list[MsgUnion] = []
             for txid in rest.get('txid', [last.reqid]):
                 resp = BrokerdStatus(
-                    reqid=txid,
+                    reqid=reqid,
                     account=last.account,
                     time_ns=time.time_ns(),
                     status='cancelled',