Factor msg loop into new func: `handle_order_updates()`

piker/brokers/kraken/broker.py

@@ -329,10 +329,41 @@ async def trades_dialogue(
                 ids,
             )
 
-            # process and relay trades events to ems
-            # https://docs.kraken.com/websockets/#message-ownTrades
+            # enter relay loop
+            await handle_order_updates(
+                ws,
+                ems_stream,
+                emsflow,
+                ids,
+                trans,
+                acctid,
+                acc_name,
+                token,
+            )
+
+
+async def handle_order_updates(
+    ws: NoBsWs,
+    ems_stream: tractor.MsgStream,
+    emsflow: dict[str, list[MsgUnion]],
+    ids: bidict[str, int],
+    trans: list[pp.Transaction],
+    acctid: str,
+    acc_name: str,
+    token: str,
+
+) -> None:
+    '''
+    Main msg handling loop for all things order management.
+
+    This code is broken out to make the context explicit and state variables
+    defined in the signature clear to the reader.
+
+    '''
     async for msg in stream_messages(ws):
         match msg:
+            # process and relay clearing trade events to ems
+            # https://docs.kraken.com/websockets/#message-ownTrades
             case [
                 trades_msgs,
                 'ownTrades',
@@ -405,7 +436,7 @@ async def trades_dialogue(
                         t.bsuid for t in trans),
                 )
 
-                        # emit pp msgs
+                # emit any new pp msgs to ems
                 for pos in filter(
                     bool,
                     chain(active.values(), closed.values()),
@@ -432,19 +463,16 @@ async def trades_dialogue(
                     )
                     await ems_stream.send(pp_msg.dict())
 
+            # process and relay order state change events
+            # https://docs.kraken.com/websockets/#message-openOrders
             case [
                 order_msgs,
                 'openOrders',
                 {'sequence': seq},
             ]:
-                        # TODO: async order update handling which we
-                        # should remove from `handle_order_requests()`
-                        # above:
-                        # https://github.com/pikers/piker/issues/293
-                        # https://github.com/pikers/piker/issues/310
                 for order_msg in order_msgs:
                     log.info(
-                                'Order msg update_{seq}:\n'
+                        f'Order msg update_{seq}:\n'
                         f'{pformat(order_msg)}'
                     )
                     txid, update_msg = list(order_msg.items())[0]