Refer to async exit stack via feed

piker/brokers/data.py

@@ -116,6 +116,7 @@ class DataFeed(typing.NamedTuple):
     """
     mod: ModuleType
     client: object
+    exit_stack: contextlib.AsyncExitStack
     quoter_keys: List[str] = ['stock', 'option']
     tasks: Dict[str, trio._core._run.Task] = dict.fromkeys(
         quoter_keys, False)
@@ -271,8 +272,6 @@ async def get_cached_feed(
     ss = tractor.current_actor().statespace
     feeds = ss.setdefault('feeds', {'_lock': trio.Lock()})
     lock = feeds['_lock']
-    feed_stacks = ss.setdefault('feed_stacks', {})
-    feed_stack = feed_stacks.setdefault(brokername, contextlib.AsyncExitStack())
     async with lock:
         try:
             feed = feeds[brokername]
@@ -281,11 +280,13 @@ async def get_cached_feed(
         except KeyError:
             log.info(f"Creating new client for broker {brokername}")
             brokermod = get_brokermod(brokername)
-            client = await feed_stack.enter_async_context(
+            exit_stack = contextlib.AsyncExitStack()
+            client = await exit_stack.enter_async_context(
                 brokermod.get_client())
             feed = DataFeed(
                 mod=brokermod,
                 client=client,
+                exit_stack=exit_stack,
             )
             feeds[brokername] = feed
             return feed
@@ -306,7 +307,6 @@ async def start_quote_stream(
     Since most brokers seems to support batch quote requests we
     limit to one task per process for now.
     """
-
     actor = tractor.current_actor()
     # set log level after fork
     get_console_log(actor.loglevel)
@@ -376,7 +376,7 @@ async def start_quote_stream(
             # broker2symbolsubs.pop(broker, None)
 
             # destroy the API client
-            await feed_stack.aclose()
+            await feed.exit_stack.aclose()
 
 
 async def stream_to_file(