Handle non-fqsn for derivs and don't put brokername in

piker/data/feed.py

@@ -377,8 +377,10 @@ def diff_history(
 
 async def allocate_persistent_feed(
     bus: _FeedsBus,
+
     brokername: str,
     symbol: str,
+
     loglevel: str,
     start_stream: bool = True,
 
@@ -398,6 +400,7 @@ async def allocate_persistent_feed(
     - a real-time streaming task which connec
 
     '''
+    # load backend module
     try:
         mod = get_brokermod(brokername)
     except ImportError:
@@ -454,7 +457,10 @@ async def allocate_persistent_feed(
     # true fqsn
     fqsn = '.'.join((bfqsn, brokername))
     # add a fqsn entry that includes the ``.<broker>`` suffix
+    # and an entry that includes the broker-specific fqsn (including
+    # any new suffixes or elements as injected by the backend).
     init_msg[fqsn] = msg
+    init_msg[bfqsn] = msg
 
     # TODO: pretty sure we don't need this? why not just leave 1s as
     # the fastest "sample period" since we'll probably always want that
@@ -468,13 +474,14 @@ async def allocate_persistent_feed(
     await some_data_ready.wait()
 
     # append ``.<broker>`` suffix to each quote symbol
-    bsym = symbol + f'.{brokername}'
+    acceptable_not_fqsn_with_broker_suffix = symbol + f'.{brokername}'
+
     generic_first_quotes = {
-        bsym: first_quote,
+        acceptable_not_fqsn_with_broker_suffix: first_quote,
         fqsn: first_quote,
     }
 
-    bus.feeds[symbol] = bus.feeds[fqsn] = (
+    bus.feeds[symbol] = bus.feeds[bfqsn] = (
         init_msg,
         generic_first_quotes,
     )
@@ -525,7 +532,7 @@ async def open_feed_bus(
 
     ctx: tractor.Context,
     brokername: str,
-    symbol: str,
+    symbol: str,  # normally expected to the broker-specific fqsn
     loglevel: str,
     tick_throttle:  Optional[float] = None,
     start_stream: bool = True,
@@ -547,7 +554,9 @@ async def open_feed_bus(
     # TODO: check for any stale shm entries for this symbol
     # (after we also group them in a nice `/dev/shm/piker/` subdir).
     # ensure we are who we think we are
-    assert 'brokerd' in tractor.current_actor().name
+    servicename = tractor.current_actor().name
+    assert 'brokerd' in servicename
+    assert brokername in servicename
 
     bus = get_feed_bus(brokername)
 
@@ -557,7 +566,7 @@ async def open_feed_bus(
     entry = bus.feeds.get(symbol)
     if entry is None:
         # allocate a new actor-local stream bus which
-        # will persist for this `brokerd`.
+        # will persist for this `brokerd`'s service lifetime.
         async with bus.task_lock:
             await bus.nursery.start(
                 partial(
@@ -586,7 +595,7 @@ async def open_feed_bus(
     # true fqsn
     fqsn = '.'.join([bfqsn, brokername])
     assert fqsn in first_quotes
-    assert bus.feeds[fqsn]
+    assert bus.feeds[bfqsn]
 
     # broker-ambiguous symbol (provided on cli - eg. mnq.globex.ib)
     bsym = symbol + f'.{brokername}'