Don't open stream before starting the fsp context..

piker/fsp/_engine.py

@@ -79,7 +79,7 @@ async def filter_quotes_by_sym(
 
 async def fsp_compute(
 
-    stream: tractor.MsgStream,
+    ctx: tractor.Context,
     symbol: str,
     feed: Feed,
     quote_stream: trio.abc.ReceiveChannel,
@@ -147,6 +147,7 @@ async def fsp_compute(
     # setup a respawn handle
     with trio.CancelScope() as cs:
         tracker = TaskTracker(trio.Event(), cs)
+        await ctx.started(index)
         task_status.started((tracker, index))
         profiler(f'{func_name} yield last index')
 
@@ -155,6 +156,7 @@ async def fsp_compute(
 
         try:
             # rt stream
+            async with ctx.open_stream() as stream:
                 async for processed in out_stream:
 
                     log.debug(f"{func_name}: {processed}")
@@ -229,14 +231,13 @@ async def cascade(
         # last_len = new_len = len(src.array)
 
         async with (
-            ctx.open_stream() as stream,
             trio.open_nursery() as n,
         ):
 
             fsp_target = partial(
 
                 fsp_compute,
-                stream=stream,
+                ctx=ctx,
                 symbol=symbol,
                 feed=feed,
                 quote_stream=quote_stream,
@@ -255,7 +256,6 @@ async def cascade(
                 last = dst.array[-1:]
                 zeroed = np.zeros(last.shape, dtype=last.dtype)
 
-            await ctx.started(index)
             profiler(f'{func_name}: fsp up')
 
             async def resync(tracker: TaskTracker) -> tuple[TaskTracker, int]: