Cast/validate streamed messages

Update comments

Minor formatting

Minor formatting

piker/brokers/kucoin.py

@@ -418,7 +418,7 @@ async def stream_quotes(
 
     async with open_cached_client("kucoin") as client:
 
-        # map through symbols and sub to feedz
+        # loop through symbols and sub to feedz
         for sym in symbols:
 
             token, ping_interval = await client._get_ws_token()
@@ -445,8 +445,9 @@ async def stream_quotes(
                 @acm
                 async def open_ping_task(ws: wsproto.WSConnection):
                     '''
-                    Ping ws server every ping_interval
-                    so Kucoin doesn't drop our connection
+                    Spawn a non-blocking task that pings the ws 
+                    server every ping_interval so Kucoin doesn't drop 
+                    our connection
 
                     '''
                     async with trio.open_nursery() as n:
@@ -468,7 +469,7 @@ async def stream_quotes(
                     l1_sub = make_sub(kucoin_sym, connect_id)
                     await ws.send_msg(l1_sub)
 
-                    yield
+                    yieldhttps: // github.com/pikers/piker/pull/494
 
                     # unsub
                     if ws.connected():
@@ -529,18 +530,20 @@ async def stream_messages(
             continue
 
         if "subject" in msg and msg["subject"] == "trade.ticker":
-            # TODO: cast msg into class
-            trade_data = msg["data"]
+
+            trade_msg = KucoinTradeMsg(**msg)
+            trade_data = KucoinTrade(**trade_msg.data)
+
             yield "trade", {
                 "symbol": sym,
-                "last": trade_data["price"],
-                "brokerd_ts": trade_data["time"],
+                "last": trade_data.price,
+                "brokerd_ts": trade_data.time,
                 "ticks": [
                     {
                         "type": "trade",
-                        "price": float(trade_data["price"]),
-                        "size": float(trade_data["size"]),
-                        "broker_ts": trade_data["time"],
+                        "price": float(trade_data.price),
+                        "size": float(trade_data.size),
+                        "broker_ts": trade_data.time,
                     }
                 ],
             }
@@ -555,12 +558,15 @@ async def open_history_client(
     type: str = "1m",
 ) -> AsyncGenerator[Callable, None]:
     async with open_cached_client("kucoin") as client:
-        # call bars on kucoin
+
         async def get_ohlc_history(
+
             timeframe: float,
             end_dt: datetime | None = None,
             start_dt: datetime | None = None,
-        ) -> tuple[np.ndarray, datetime | None, datetime | None,]:  # start  # end
+
+        ) -> tuple[np.ndarray, datetime | None, datetime | None]:  # start  # end
+
             if timeframe != 60:
                 raise DataUnavailable("Only 1m bars are supported")
 
@@ -573,10 +579,13 @@ async def open_history_client(
             times = array["time"]
 
             if end_dt is None:
+
                 inow = round(time.time())
+
                 print(
                     f"difference in time between load and processing {inow - times[-1]}"
                 )
+
                 if (inow - times[-1]) > 60:
                     await tractor.breakpoint()