Swap `open_channel_from()` yield-pair order

Port deribit and IB `asyncio` bridge callables to the new
`to_asyncio.open_channel_from()` signature where the `LinkedTaskChannel`
is the first param and `started_nowait()` replaces the old
`to_trio.send_nowait()` sync handshake.

Deats,
- deribit `api.py`: update `aio_price_feed_relay()` and
  `aio_order_feed_relay()` signatures to take `chan: LinkedTaskChannel`
  as first arg; drop `from_trio`/`to_trio` params; replace
  `to_trio.send_nowait()` with `chan.send_nowait()` and
  `chan.started_nowait()`.
- drop `functools.partial()` wrapping in both `open_price_feed()` and
  `open_order_feed()`; pass `fh=`/`instrument=` as kwargs directly.
- IB `broker.py`: same `chan` + `started_nowait()` port for
  `recv_trade_updates()`.

Other styling,
- rewrap `recv_trade_updates()` docstring to 67 chars.

(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

piker/brokers/deribit/api.py

@@ -23,7 +23,6 @@ from contextlib import (
     asynccontextmanager as acm,
 )
 from datetime import datetime
-from functools import partial
 import time
 from typing import (
     Any,
@@ -524,13 +523,12 @@ async def maybe_open_feed_handler() -> trio.abc.ReceiveStream:
 
 
 async def aio_price_feed_relay(
+    chan: to_asyncio.LinkedTaskChannel,
     fh: FeedHandler,
     instrument: Symbol,
-    from_trio: asyncio.Queue,
-    to_trio: trio.abc.SendChannel,
 ) -> None:
     async def _trade(data: dict, receipt_timestamp):
-        to_trio.send_nowait(('trade', {
+        chan.send_nowait(('trade', {
             'symbol': cb_sym_to_deribit_inst(
                 str_to_cb_sym(data.symbol)).lower(),
             'last': data,
@@ -540,7 +538,7 @@ async def aio_price_feed_relay(
         }))
 
     async def _l1(data: dict, receipt_timestamp):
-        to_trio.send_nowait(('l1', {
+        chan.send_nowait(('l1', {
             'symbol': cb_sym_to_deribit_inst(
                 str_to_cb_sym(data.symbol)).lower(),
             'ticks': [
@@ -570,7 +568,7 @@ async def aio_price_feed_relay(
             install_signal_handlers=False)
 
     # sync with trio
-    to_trio.send_nowait(None)
+    chan.started_nowait(None)
 
     await asyncio.sleep(float('inf'))
 
@@ -581,11 +579,9 @@ async def open_price_feed(
 ) -> trio.abc.ReceiveStream:
     async with maybe_open_feed_handler() as fh:
         async with to_asyncio.open_channel_from(
-            partial(
             aio_price_feed_relay,
-                fh,
-                instrument
-            )
+            fh=fh,
+            instrument=instrument,
         ) as (chan, first):
             yield chan
 
@@ -611,10 +607,9 @@ async def maybe_open_price_feed(
 
 
 async def aio_order_feed_relay(
+    chan: to_asyncio.LinkedTaskChannel,
     fh: FeedHandler,
     instrument: Symbol,
-    from_trio: asyncio.Queue,
-    to_trio: trio.abc.SendChannel,
 ) -> None:
     async def _fill(data: dict, receipt_timestamp):
         breakpoint()
@@ -637,7 +632,7 @@ async def aio_order_feed_relay(
             install_signal_handlers=False)
 
     # sync with trio
-    to_trio.send_nowait(None)
+    chan.started_nowait(None)
 
     await asyncio.sleep(float('inf'))
 
@@ -648,11 +643,9 @@ async def open_order_feed(
 ) -> trio.abc.ReceiveStream:
     async with maybe_open_feed_handler() as fh:
         async with to_asyncio.open_channel_from(
-            partial(
             aio_order_feed_relay,
-                fh,
-                instrument
-            )
+            fh=fh,
+            instrument=instrument,
         ) as (chan, first):
             yield chan
 

piker/brokers/ib/broker.py

@@ -231,20 +231,21 @@ async def handle_order_requests(
 
 async def recv_trade_updates(
 
+    chan: tractor.to_asyncio.LinkedTaskChannel,
     client: Client,
-    to_trio: trio.abc.SendChannel,
 
 ) -> None:
     '''
-    Receive and relay order control and positioning related events
-    from `ib_async`, pack as tuples and push over mem-chan to our
-    trio relay task for processing and relay to EMS.
+    Receive and relay order control and positioning
+    related events from `ib_async`, pack as tuples and
+    push over mem-chan to our trio relay task for
+    processing and relay to EMS.
 
     '''
-    client.inline_errors(to_trio)
+    client.inline_errors(chan)
 
     # sync with trio task
-    to_trio.send_nowait(client.ib)
+    chan.started_nowait(client.ib)
 
     def push_tradesies(
         eventkit_obj,
@@ -282,7 +283,7 @@ async def recv_trade_updates(
 
         try:
             # emit event name + relevant ibis internal objects
-            to_trio.send_nowait((event_name, emit))
+            chan.send_nowait((event_name, emit))
         except trio.BrokenResourceError:
             log.exception(f'Disconnected from {eventkit_obj} updates')
             eventkit_obj.disconnect(push_tradesies)