Port feed layer to use new `samplerd` APIs

Always use `open_sample_stream()` to register fast and slow quote feed
buffers and get a sampler stream which we use to trigger
`Sampler.broadcast_all()` calls on the service side after backfill
events.

piker/data/feed.py

@@ -74,10 +74,9 @@ from ._source import (
 )
 from ..ui import _search
 from ._sampling import (
-    Sampler,
+    open_sample_stream,
     sample_and_broadcast,
     uniform_rate_send,
-    _default_delay_s,
 )
 from ..brokers._util import (
     DataUnavailable,
@@ -277,6 +276,7 @@ async def start_backfill(
     bfqsn: str,
     shm: ShmArray,
     timeframe: float,
+    sampler_stream: tractor.MsgStream,
 
     last_tsdb_dt: Optional[datetime] = None,
     storage: Optional[Storage] = None,
@@ -325,7 +325,7 @@ async def start_backfill(
         # TODO: *** THIS IS A BUG ***
         # we need to only broadcast to subscribers for this fqsn..
         # otherwise all fsps get reset on every chart..
-        await Sampler.broadcast_all()
+        await sampler_stream.send('broadcast_all')
 
         # signal that backfilling to tsdb's end datum is complete
         bf_done = trio.Event()
@@ -493,7 +493,7 @@ async def start_backfill(
         # in the block above to avoid entering new ``frames``
         # values while we're pipelining the current ones to
         # memory...
-        await Sampler.broadcast_all()
+        await sampler_stream.send('broadcast_all')
 
         # short-circuit (for now)
         bf_done.set()
@@ -504,6 +504,7 @@ async def basic_backfill(
     mod: ModuleType,
     bfqsn: str,
     shms: dict[int, ShmArray],
+    sampler_stream: tractor.MsgStream,
 
 ) -> None:
 
@@ -521,7 +522,8 @@ async def basic_backfill(
                     mod,
                     bfqsn,
                     shm,
-                    timeframe=timeframe,
+                    timeframe,
+                    sampler_stream,
                 )
             )
         except DataUnavailable:
@@ -537,6 +539,7 @@ async def tsdb_backfill(
     fqsn: str,
     bfqsn: str,
     shms: dict[int, ShmArray],
+    sampler_stream: tractor.MsgStream,
 
     task_status: TaskStatus[
         tuple[ShmArray, ShmArray]
@@ -569,7 +572,8 @@ async def tsdb_backfill(
                     mod,
                     bfqsn,
                     shm,
-                    timeframe=timeframe,
+                    timeframe,
+                    sampler_stream,
                     last_tsdb_dt=last_tsdb_dt,
                     tsdb_is_up=True,
                     storage=storage,
@@ -734,7 +738,7 @@ async def tsdb_backfill(
                 #   (usually a chart showing graphics for said fsp)
                 #   which tells the chart to conduct a manual full
                 #   graphics loop cycle.
-                await Sampler.broadcast_all()
+                await sampler_stream.send('broadcast_all')
 
                 # TODO: write new data to tsdb to be ready to for next read.
 
@@ -823,79 +827,96 @@ async def manage_history(
             "Persistent shm for sym was already open?!"
         )
 
-    log.info('Scanning for existing `marketstored`')
+    # register 1s and 1m buffers with the global incrementer task
-    tsdb_is_up = await check_for_service('marketstored')
+    async with open_sample_stream(
+        period_s=1,
+        cache_key=fqsn,
+        shms_by_period={
+            1.: rt_shm.token,
+            60.: hist_shm.token,
+        },
+        open_index_stream=True,
+    ) as sample_stream:
 
-    bfqsn = fqsn.replace('.' + mod.name, '')
+        log.info('Scanning for existing `marketstored`')
-    open_history_client = getattr(mod, 'open_history_client', None)
+        tsdb_is_up = await check_for_service('marketstored')
-    assert open_history_client
 
-    if (
+        bfqsn = fqsn.replace('.' + mod.name, '')
-        tsdb_is_up
+        open_history_client = getattr(mod, 'open_history_client', None)
-        and opened
+        assert open_history_client
-        and open_history_client
-    ):
-        log.info('Found existing `marketstored`')
 
-        from . import marketstore
+        if (
-        async with (
+            tsdb_is_up
-            marketstore.open_storage_client(fqsn)as storage,
+            and opened
+            and open_history_client
         ):
-            hist_shm, rt_shm = await bus.nursery.start(
+            log.info('Found existing `marketstored`')
-                tsdb_backfill,
+
-                mod,
+            from . import marketstore
-                marketstore,
+            async with (
+                marketstore.open_storage_client(fqsn)as storage,
+            ):
+                # TODO: drop returning the output that we pass in?
+                (
+                    hist_shm,
+                    rt_shm,
+                ) = await bus.nursery.start(
+                    tsdb_backfill,
+                    mod,
+                    marketstore,
+                    bus,
+                    storage,
+                    fqsn,
+                    bfqsn,
+                    {
+                        1: rt_shm,
+                        60: hist_shm,
+                    },
+                    sample_stream,
+                )
+
+                # yield back after client connect with filled shm
+                task_status.started((
+                    hist_zero_index,
+                    hist_shm,
+                    rt_zero_index,
+                    rt_shm,
+                ))
+
+                # indicate to caller that feed can be delivered to
+                # remote requesting client since we've loaded history
+                # data that can be used.
+                some_data_ready.set()
+
+                # history retreival loop depending on user interaction
+                # and thus a small RPC-prot for remotely controllinlg
+                # what data is loaded for viewing.
+                await trio.sleep_forever()
+
+        # load less history if no tsdb can be found
+        elif (
+            not tsdb_is_up
+            and opened
+        ):
+            await basic_backfill(
                 bus,
-                storage,
+                mod,
-                fqsn,
                 bfqsn,
                 {
                     1: rt_shm,
                     60: hist_shm,
                 },
+                sample_stream,
             )
-
-            # yield back after client connect with filled shm
             task_status.started((
                 hist_zero_index,
                 hist_shm,
                 rt_zero_index,
                 rt_shm,
             ))
-
-            # indicate to caller that feed can be delivered to
-            # remote requesting client since we've loaded history
-            # data that can be used.
             some_data_ready.set()
-
-            # history retreival loop depending on user interaction and thus
-            # a small RPC-prot for remotely controllinlg what data is loaded
-            # for viewing.
             await trio.sleep_forever()
 
-    # load less history if no tsdb can be found
-    elif (
-        not tsdb_is_up
-        and opened
-    ):
-        await basic_backfill(
-            bus,
-            mod,
-            bfqsn,
-            shms={
-                1: rt_shm,
-                60: hist_shm,
-            },
-        )
-        task_status.started((
-            hist_zero_index,
-            hist_shm,
-            rt_zero_index,
-            rt_shm,
-        ))
-        some_data_ready.set()
-        await trio.sleep_forever()
-
 
 async def allocate_persistent_feed(
     bus: _FeedsBus,
@@ -997,6 +1018,7 @@ async def allocate_persistent_feed(
     # https://github.com/python-trio/trio/issues/2258
     # bus.nursery.start_soon(
     # await bus.start_task(
+
     (
         izero_hist,
         hist_shm,
@@ -1029,13 +1051,6 @@ async def allocate_persistent_feed(
     # feed to that name (for now).
     bus.feeds[symstr] = bus.feeds[bfqsn] = flume
 
-    # insert 1s ohlc into the increment buffer set
-    # to update and shift every second
-    Sampler.ohlcv_shms.setdefault(
-        1,
-        []
-    ).append(rt_shm)
-
     task_status.started()
 
     if not start_stream:
@@ -1045,18 +1060,6 @@ async def allocate_persistent_feed(
     # the backend will indicate when real-time quotes have begun.
     await feed_is_live.wait()
 
-    # insert 1m ohlc into the increment buffer set
-    # to shift every 60s.
-    Sampler.ohlcv_shms.setdefault(60, []).append(hist_shm)
-
-    # create buffer a single incrementer task broker backend
-    # (aka `brokerd`) using the lowest sampler period.
-    if Sampler.incrementers.get(_default_delay_s) is None:
-        await bus.start_task(
-            Sampler.increment_ohlc_buffer,
-            _default_delay_s,
-        )
-
     sum_tick_vlm: bool = init_msg.get(
         'shm_write_opts', {}
     ).get('sum_tick_vlm', True)