Add trades data stream routine to Feed

piker/data/__init__.py

@@ -144,9 +144,11 @@ class Feed:
     name: str
     stream: AsyncIterator[Dict[str, Any]]
     shm: ShmArray
+    mod: ModuleType
     # ticks: ShmArray
     _brokerd_portal: tractor._portal.Portal
-    _index_stream: Optional[AsyncIterator[Dict[str, Any]]] = None
+    _index_stream: Optional[AsyncIterator[int]] = None
+    _trade_stream: Optional[AsyncIterator[Dict[str, Any]]] = None
 
     async def receive(self) -> dict:
         return await self.stream.__anext__()
@@ -164,6 +166,26 @@ class Feed:
 
         return self._index_stream
 
+    async def recv_trades_data(self) -> AsyncIterator[dict]:
+
+        if not getattr(self.mod, 'stream_trades', False):
+            log.warning(f"{self.mod.name} doesn't have trade data support yet :(")
+
+            # yah this is bullshitty but it worx
+            async def nuttin():
+                yield
+                return
+
+            return nuttin()
+
+        if not self._trade_stream:
+            self._trade_stream = await self._brokerd_portal.run(
+                self.mod.stream_trades,
+                topics=['all'],  # do we need this?
+            )
+
+        return self._trade_stream
+
 
 def sym_to_shm_key(
     broker: str,
@@ -228,5 +250,6 @@ async def open_feed(
             name=name,
             stream=stream,
             shm=shm,
+            mod=mod,
             _brokerd_portal=portal,
         )