Add actor-global "broker client" for tracking reqids

piker/brokers/kraken/broker.py

@@ -31,6 +31,7 @@ import time
 from typing import (
     Any,
     AsyncIterator,
+    Iterable,
     Union,
 )
 
@@ -86,6 +87,33 @@ class TooFastEdit(Exception):
     'Edit requests faster then api submissions'
 
 
+# TODO: make this wrap the `Client` and `ws` instances
+# and give it methods to submit cancel vs. add vs. edit
+# requests?
+class BrokerClient:
+    '''
+    Actor global, client-unique order manager API.
+
+    For now provides unique ``brokerd`` defined "request ids"
+    and "user reference" values to track ``kraken`` ws api order
+    dialogs.
+
+    '''
+    counter: Iterable = count(1)
+    _table: set[int] = set()
+
+    @classmethod
+    def new_reqid(cls) -> int:
+        for reqid in cls.counter:
+            if reqid not in cls._table:
+                cls._table.add(reqid)
+                return reqid
+
+    @classmethod
+    def add_reqid(cls, reqid: int) -> None:
+        cls._table.add(reqid)
+
+
 async def handle_order_requests(
 
     ws: NoBsWs,
@@ -105,7 +133,6 @@ async def handle_order_requests(
     # XXX: UGH, let's unify this.. with ``msgspec``.
     msg: dict[str, Any]
     order: BrokerdOrder
-    counter = count(1)
 
     async for msg in ems_order_stream:
         log.info(f'Rx order msg:\n{pformat(msg)}')
@@ -178,7 +205,8 @@ async def handle_order_requests(
 
                 else:
                     ep = 'addOrder'
-                    reqid = next(counter)
+
+                    reqid = BrokerClient.new_reqid()
                     ids[order.oid] = reqid
                     log.debug(
                         f"Adding order {reqid}\n"
@@ -798,6 +826,10 @@ async def handle_order_updates(
                             oid = str(reqid)
                             ids[oid] = reqid  # NOTE!: str -> int
 
+                            # ensure wtv reqid they give us we don't re-use on
+                            # new order submissions to this actor's client.
+                            BrokerClient.add_reqid(reqid)
+
                             # fill out ``Status`` + boxed ``Order``
                             status_msg = Status(
                                 time_ns=time.time_ns(),