Rewrite, edit and organize examples/websocket demos.

examples/websocket/public/trades.py

@@ -0,0 +1,29 @@
+# python -c "import examples.websocket.public.trades"
+
+from bfxapi import Client, PUB_WSS_HOST
+from bfxapi.websocket.enums import Error, Channel
+from bfxapi.websocket.types import Candle, TradingPairTrade
+
+from bfxapi.websocket import subscriptions
+
+bfx = Client(WSS_HOST=PUB_WSS_HOST)
+
+@bfx.wss.on("candles_update")
+def on_candles_update(subscription: subscriptions.Candles, candle: Candle):
+  print(f"New candle: {candle}")
+
+@bfx.wss.on("t_trade_executed")
+def on_t_trade_executed(subscription: subscriptions.Trades, trade: TradingPairTrade):
+  print(f"New trade: {trade}")
+
+@bfx.wss.on("wss-error")
+def on_wss_error(code: Error, msg: str):
+    print(code, msg)
+
+@bfx.wss.once("open")
+async def open():
+    await bfx.wss.subscribe(Channel.CANDLES, key="trade:1m:tBTCUSD")
+
+    await bfx.wss.subscribe(Channel.TRADES, symbol="tBTCUSD")
+
+bfx.wss.run()