Use `match:` syntax in data feed subs processing

piker/brokers/kraken/feed.py

@@ -117,9 +117,8 @@ async def stream_messages(
                 too_slow_count = 0
                 continue
 
-        if isinstance(msg, dict):
+        match msg:
-            if msg.get('event') == 'heartbeat':
+            case {'event': 'heartbeat'}:
-
                 now = time.time()
                 delay = now - last_hb
                 last_hb = now
@@ -130,10 +129,19 @@ async def stream_messages(
 
                 continue
 
-            err = msg.get('errorMessage')
+            case {
-            if err:
+                'connectionID': _,
-                raise BrokerError(err)
+                'event': 'systemStatus',
-        else:
+                'status': 'online',
+                'version': _,
+            } as msg:
+                log.info(
+                    'WS connection is up:\n'
+                    f'{msg}'
+                )
+                continue
+
+            case _:
                 yield msg
 
 
@@ -145,16 +153,39 @@ async def process_data_feed_msgs(
 
     '''
     async for msg in stream_messages(ws):
+        match msg:
+            case {
+                'errorMessage': errmsg
+            }:
+                raise BrokerError(errmsg)
 
-        chan_id, *payload_array, chan_name, pair = msg
+            case {
+                'event': 'subscriptionStatus',
+            } as sub:
+                log.info(
+                    'WS subscription is active:\n'
+                    f'{sub}'
+                )
+                continue
 
+            case [
+                chan_id,
+                *payload_array,
+                chan_name,
+                pair
+            ]:
                 if 'ohlc' in chan_name:
-
+                    yield 'ohlc', OHLC(
-            yield 'ohlc', OHLC(chan_id, chan_name, pair, *payload_array[0])
+                        chan_id,
+                        chan_name,
+                        pair,
+                        *payload_array[0]
+                    )
 
                 elif 'spread' in chan_name:
 
-            bid, ask, ts, bsize, asize = map(float, payload_array[0])
+                    bid, ask, ts, bsize, asize = map(
+                        float, payload_array[0])
 
                     # TODO: really makes you think IB has a horrible API...
                     quote = {
@@ -173,9 +204,9 @@ async def process_data_feed_msgs(
                 #     chan_id, *payload_array, chan_name, pair = msg
                 #     print(msg)
 
-        else:
+            case _:
                 print(f'UNHANDLED MSG: {msg}')
-            yield msg
+                # yield msg
 
 
 def normalize(
@@ -385,7 +416,7 @@ async def stream_quotes(
             msg_gen = process_data_feed_msgs(ws)
 
             # TODO: use ``anext()`` when it lands in 3.10!
-            typ, ohlc_last = await msg_gen.__anext__()
+            typ, ohlc_last = await anext(msg_gen)
 
             topic, quote = normalize(ohlc_last)