ib.feed: start drafting out `get_mkt_info()` endpoint

piker/brokers/ib/feed.py

@@ -19,7 +19,10 @@ Data feed endpoints pre-wrapped and ready for use with ``tractor``/``trio``.
 """
 from __future__ import annotations
 import asyncio
-from contextlib import asynccontextmanager as acm
+from contextlib import (
+    asynccontextmanager as acm,
+    nullcontext,
+)
 from decimal import Decimal
 from dataclasses import asdict
 from datetime import datetime
@@ -59,6 +62,9 @@ from .api import (
     Contract,
 )
 from ._util import data_reset_hack
+from piker._cacheables import (
+    async_lifo_cache,
+)
 
 
 # https://interactivebrokers.github.io/tws-api/tick_types.html
@@ -733,22 +739,36 @@ def normalize(
     return data
 
 
-# TODO!
-# async def get_mkt_info(
-#     fqme: str,
+@async_lifo_cache()
+async def get_mkt_info(
+    fqme: str,
 
-#     _cache: dict[str, MktPair] = {}
+    proxy: MethodProxy | None = None,
 
-# ) -> tuple[MktPair, Pair]:
+) -> tuple[MktPair, Pair]:
 
-#     both = _cache.get(fqme)
-#     if both:
-#         return both
+    # we don't need to split off any fqme broker part?
+    # bs_fqme, _, broker = fqme.partition('.')
 
-#     proxy: MethodProxy
-#     async with open_data_client() as proxy:
+    proxy: MethodProxy
+    if proxy is not None:
+        client_ctx = nullcontext(proxy)
+    else:
+        client_ctx = open_data_client
+
+    async with client_ctx as proxy:
+
+        try:
+            (
+                con,  # Contract
+                details,  # ContractDetails
+            ) = await proxy.get_sym_details(symbol=fqme)
+        except ConnectionError:
+            log.exception(f'Proxy is ded {proxy._aio_ns}')
+            raise
 
         # pair: Pair = await client.exch_info(fqme.upper())
+
         # mkt = MktPair(
         #     dst=Asset(
         #         name=pair.baseAsset,
@@ -765,9 +785,9 @@ def normalize(
         #     bs_mktid=pair.symbol,
         #     broker='binance',
         # )
-#         both = mkt, pair
-#         _cache[fqme] = both
+
         # return both
+        return con, details
 
 
 async def stream_quotes(
@@ -794,18 +814,11 @@ async def stream_quotes(
 
     proxy: MethodProxy
     async with open_data_client() as proxy:
-        try:
-            (
-                con,  # Contract
-                first_ticker,  # Ticker
-                details,  # ContractDetails
-            ) = await proxy.get_sym_details(symbol=sym)
-        except ConnectionError:
-            log.exception(f'Proxy is ded {proxy._aio_ns}')
-            raise
+        con, details = await get_mkt_info(sym, proxy=proxy)
 
+        first_ticker = await proxy.get_quote(contract=con)
         first_quote = normalize(first_ticker)
-        # print(f'first quote: {first_quote}')
+        log.runtime(f'FIRST QUOTE: {first_quote}')
 
         def mk_init_msgs() -> dict[str, dict]:
             '''
@@ -879,7 +892,7 @@ async def stream_quotes(
         # TODO: we should instead spawn a task that waits on a feed to start
         # and let it wait indefinitely..instead of this hard coded stuff.
         with trio.move_on_after(1):
-            contract, first_ticker, details = await proxy.get_quote(symbol=sym)
+            first_ticker = await proxy.get_quote(contract=con)
 
         # it might be outside regular trading hours so see if we can at
         # least grab history.