`.deribit.feed`: get live quotes workin (again)

The quote-msg `'topic'` field was being set and sent as the
`OptionPair.symbol: str` value instead of as the `MktPair.bs_fqme: str`
as is required for matching on the `piker.data.feed` side. So change to
that and simplify the actual `.bs_fqme: str` value to NOT include the
ISO-format time (for now) since it's a big ugly and longer term we need
a `piker`-fqme friendly-on-ze-eyes format/style anyway..

piker/brokers/deribit/feed.py

@@ -29,6 +29,7 @@ from typing import (
 # from pprint import pformat
 import time
 
+import cryptofeed
 import trio
 from trio_typing import TaskStatus
 from pendulum import (
@@ -52,19 +53,10 @@ from piker._cacheables import (
 )
 from piker.log import (
     get_logger,
+    mk_repr,
 )
 from piker.data.validate import FeedInit
 
-# from cryptofeed import FeedHandler
-# from cryptofeed.defines import (
-#     DERIBIT,
-#     L1_BOOK,
-#     TRADES,
-#     OPTION,
-#     CALL,
-#     PUT,
-# )
-# from cryptofeed.symbols import Symbol
 
 from .api import (
     Client,
@@ -219,51 +211,64 @@ async def get_mkt_info(
             price_tick=pair.price_tick,
             size_tick=pair.size_tick,
             bs_mktid=pair.symbol,
-            expiry=pair.expiry,
             venue=mkt_mode,
             broker='deribit',
             _atype=mkt_mode,
             _fqme_without_src=True,
+
+            # expiry=pair.expiry,
+            # XXX TODO, currently we don't use it since it's
+            # already "described" in the `OptionPair.symbol: str`
+            # and if we slap in the ISO repr it's kinda hideous..
+            # -[ ] figure out the best either std
         )
         return mkt, pair
 
 
 async def stream_quotes(
-
     send_chan: trio.abc.SendChannel,
     symbols: list[str],
     feed_is_live: trio.Event,
-    loglevel: str = None,
 
     # startup sync
     task_status: TaskStatus[tuple[dict, dict]] = trio.TASK_STATUS_IGNORED,
 
 ) -> None:
+    '''
+    Open a live quote stream for the market set defined by `symbols`.
 
+    '''
     sym = symbols[0].split('.')[0]
-
     init_msgs: list[FeedInit] = []
 
+    # multiline nested `dict` formatter (since rn quote-msgs are
+    # just that).
+    pfmt: Callable[[str], str] = mk_repr()
+
     async with (
         open_cached_client('deribit') as client,
         send_chan as send_chan
     ):
-
+        mkt: MktPair
+        pair: Pair
         mkt, pair = await get_mkt_info(sym)
 
         # build out init msgs according to latest spec
         init_msgs.append(
-            FeedInit(mkt_info=mkt)
+            FeedInit(
+                mkt_info=mkt,
+            )
         )
-        nsym = piker_sym_to_cb_sym(sym)
+        # build `cryptofeed` feed-handle
+        cf_sym: cryptofeed.Symbol = piker_sym_to_cb_sym(sym)
 
         async with maybe_open_price_feed(sym) as stream:
-
+            last_trades = (
-            # TODO, uhh use it ?? XD
+                await client.last_trades(
-            # cache = client._pairs
+                    cb_sym_to_deribit_inst(cf_sym),
-
+                    count=1,
-            last_trades = (await client.last_trades(
+                )
-                cb_sym_to_deribit_inst(nsym), count=1)).trades
+            ).trades
 
             if len(last_trades) == 0:
                 last_trade = None
@@ -286,16 +291,25 @@ async def stream_quotes(
                     'broker_ts': last_trade.timestamp
                 }]
             }
-            task_status.started((init_msgs,  first_quote))
+            task_status.started((
+                init_msgs,
+                first_quote,
+            ))
 
             feed_is_live.set()
 
+            # NOTE XXX, static for now!
+            # => since this only handles ONE mkt feed at a time we
+            # don't need a lookup table to map interleaved quotes
+            # from multiple possible mkt-pairs
+            topic: str = mkt.bs_fqme
+
             # deliver until cancelled
             async for typ, quote in stream:
-                topic: str = quote['symbol']
+                sym: str = quote['symbol']
                 log.info(
-                    f'deribit {typ!r} quote\n\n'
+                    f'deribit {typ!r} quote for {sym!r}\n\n'
-                    f'{quote}\n'
+                    f'{pfmt(quote)}\n'
                 )
                 await send_chan.send({
                     topic: quote,