Add client side multi-provider feed symbol search

piker/data/feed.py

@@ -17,6 +17,8 @@
 """
 Data feed apis and infra.
 
+This module is enabled for ``brokerd`` daemons.
+
 """
 from dataclasses import dataclass, field
 from contextlib import asynccontextmanager
@@ -25,13 +27,14 @@ from types import ModuleType
 from typing import (
     Dict, Any, Sequence,
     AsyncIterator, Optional,
-    List
+    List, Awaitable, Callable
 )
 
 import trio
 from trio_typing import TaskStatus
 import tractor
 from pydantic import BaseModel
+from fuzzywuzzy import process as fuzzy
 
 from ..brokers import get_brokermod
 from ..log import get_logger, get_console_log
@@ -43,6 +46,7 @@ from ._sharedmem import (
     attach_shm_array,
     ShmArray,
 )
+from .ingest import get_ingestormod
 from ._source import base_iohlc_dtype, Symbol
 from ._sampling import (
     _shms,
@@ -51,7 +55,6 @@ from ._sampling import (
     iter_ohlc_periods,
     sample_and_broadcast,
 )
-from .ingest import get_ingestormod
 
 
 log = get_logger(__name__)
@@ -172,7 +175,7 @@ async def allocate_persistent_feed(
     )
 
     # do history validation?
-    assert opened, f'Persistent shm for {symbol} was already open?!'
+    # assert opened, f'Persistent shm for {symbol} was already open?!'
     # if not opened:
     #     raise RuntimeError("Persistent shm for sym was already open?!")
 
@@ -235,6 +238,7 @@ async def allocate_persistent_feed(
 
 @tractor.stream
 async def attach_feed_bus(
+
     ctx: tractor.Context,
     brokername: str,
     symbol: str,
@@ -313,6 +317,8 @@ class Feed:
     _trade_stream: Optional[AsyncIterator[Dict[str, Any]]] = None
     _max_sample_rate: int = 0
 
+    search: Callable[..., Awaitable] = None
+
     # cache of symbol info messages received as first message when
     # a stream startsc.
     symbols: Dict[str, Symbol] = field(default_factory=dict)
@@ -335,6 +341,7 @@ class Feed:
                 iter_ohlc_periods,
                 delay_s=delay_s or self._max_sample_rate,
             ) as self._index_stream:
+
                 yield self._index_stream
         else:
             yield self._index_stream
@@ -366,8 +373,29 @@ class Feed:
             ) as self._trade_stream:
                 yield self._trade_stream
         else:
+
             yield self._trade_stream
 
+    @asynccontextmanager
+    async def open_symbol_search(self) -> AsyncIterator[dict]:
+
+        async with self._brokerd_portal.open_context(
+
+            self.mod.open_symbol_search,
+
+        ) as (ctx, cache):
+
+            async with ctx.open_stream() as stream:
+
+                async def search(text: str) -> Dict[str, Any]:
+                    await stream.send(text)
+                    return await stream.receive()
+
+                # deliver search func to consumer
+                self.search = search
+                yield search
+                self.search = None
+
 
 def sym_to_shm_key(
     broker: str,
@@ -376,6 +404,39 @@ def sym_to_shm_key(
     return f'{broker}.{symbol}'
 
 
+# cache of brokernames to feeds
+_cache: Dict[str, Feed] = {}
+_cache_lock: trio.Lock = trio.Lock()
+
+
+def get_multi_search() -> Callable[..., Awaitable]:
+
+    global _cache
+
+    async def multisearcher(
+        pattern: str,
+    ) -> dict:
+
+        matches = {}
+
+        async def pack_matches(
+            brokername: str,
+            pattern: str,
+        ) -> None:
+            matches[brokername] = await feed.search(pattern)
+
+        # TODO: make this an async stream?
+        async with trio.open_nursery() as n:
+
+            for (brokername, startup_sym), feed in _cache.items():
+                if feed.search:
+                    n.start_soon(pack_matches, brokername, pattern)
+
+        return matches
+
+    return multisearcher
+
+
 @asynccontextmanager
 async def open_feed(
     brokername: str,
@@ -383,20 +444,34 @@ async def open_feed(
     loglevel: Optional[str] = None,
 ) -> AsyncIterator[Dict[str, Any]]:
     """Open a "data feed" which provides streamed real-time quotes.
+
     """
+    global _cache, _cache_lock
+
+    sym = symbols[0]
+
+    # TODO: feed cache locking, right now this is causing
+    # issues when reconncting to a long running emsd?
+
+    # async with _cache_lock:
+    #     feed = _cache.get((brokername, sym))
+
+    #     # if feed is not None and sym in feed.symbols:
+    #     if feed is not None:
+    #         yield feed
+    #         # short circuit
+    #         return
+
     try:
         mod = get_brokermod(brokername)
     except ImportError:
         mod = get_ingestormod(brokername)
 
-    if loglevel is None:
-        loglevel = tractor.current_actor().loglevel
-
-    # TODO: do all!
-    sym = symbols[0]
-
-    # TODO: compress these to one line with py3.9+
-    async with maybe_spawn_brokerd(brokername, loglevel=loglevel) as portal:
+    # no feed for broker exists so maybe spawn a data brokerd
+    async with maybe_spawn_brokerd(
+        brokername,
+        loglevel=loglevel
+    ) as portal:
 
         async with portal.open_stream_from(
 
@@ -449,8 +524,11 @@ async def open_feed(
 
             feed._max_sample_rate = max(ohlc_sample_rates)
 
+            _cache[(brokername, sym)] = feed
+
             try:
-                yield feed
+                async with feed.open_symbol_search():
+                    yield feed
 
             finally:
                 # always cancel the far end producer task