Rework paper engine for "offline" pp loading

This will end up being super handy for testing our accounting subsystems
as well as providing unified and simple cli utils for managing ledgers
and position tracking. Allows loading the paper boi without starting
a data feed and instead just trigger ledger and pps loading without
starting the entire clearing engine.

Deatz:
- only init `PaperBoi` and start clearing loop (tasks) if a non-`None`
  fqme is provided, ow just `Context.started()` the existing pps msgs
  as loaded from the ledger.
- always update both the ledger and pp table on startup and pass
  a single instance of each obj to the `PaperBoi` for reuse (without
  opening and closing backing config files since we now have
  `.write_config()`).
- drop the global `_positions` dict, it's not needed any more if we use
  a `PaperBoi.ppt: PpTable` which persists with the engine actor's
  lifetime.

piker/clearing/_paper_engine.py

@@ -25,8 +25,6 @@ from operator import itemgetter
 import itertools
 import time
 from typing import (
-    Any,
-    Optional,
     Callable,
 )
 import uuid
@@ -41,7 +39,9 @@ from ..data.types import Struct
 from ..accounting._mktinfo import Symbol
 from ..accounting import (
     Position,
+    PpTable,
     Transaction,
+    TransactionLedger,
     open_trade_ledger,
     open_pps,
 )
@@ -73,13 +73,14 @@ class PaperBoi(Struct):
 
     ems_trades_stream: tractor.MsgStream
 
+    ppt: PpTable
+    ledger: TransactionLedger
+
     # map of paper "live" orders which be used
     # to simulate fills based on paper engine settings
     _buys: defaultdict[str, bidict]
     _sells: defaultdict[str, bidict]
     _reqids: bidict
-    _positions: dict[str, Position]
-    _trade_ledger: dict[str, Any]
     _syms: dict[str, Symbol] = {}
 
     # init edge case L1 spread
@@ -93,7 +94,7 @@ class PaperBoi(Struct):
         price: float,
         action: str,
         size: float,
-        reqid: Optional[str],
+        reqid: str | None,
 
     ) -> int:
         '''
@@ -261,25 +262,15 @@ class PaperBoi(Struct):
             bs_mktid=key,
         )
 
-        with (
-            open_trade_ledger(
-                self.broker,
-                'paper',
-            ) as ledger,
-
-            open_pps(
-                brokername=self.broker,
-                acctid='paper',
-                write_on_exit=True,
-            ) as table
-        ):
         tx = t.to_dict()
         tx.pop('sym')
-            ledger.update({oid: tx})
-            # Write to pps toml right now
-            table.update_from_trans({oid: t})
 
-            pp = table.pps[key]
+        # update in-mem ledger and pos table
+        self.ledger.update({oid: tx})
+        self.ppt.update_from_trans({oid: t})
+
+        # transmit pp msg to ems
+        pp = self.ppt.pps[key]
         pp_msg = BrokerdPosition(
             broker=self.broker,
             account='paper',
@@ -291,9 +282,12 @@ class PaperBoi(Struct):
             size=pp.size,
             avg_price=pp.ppu,
         )
-
         await self.ems_trades_stream.send(pp_msg)
 
+        # write all updates to filesys
+        self.ledger.write_config()
+        self.ppt.write_config()
+
 
 async def simulate_fills(
     quote_stream: tractor.MsgStream,  # noqa
@@ -518,7 +512,6 @@ _sells: defaultdict[
         tuple[float, float, str, str],  # order info
     ]
 ] = defaultdict(bidict)
-_positions: dict[str, Position] = {}
 
 
 @tractor.context
@@ -526,27 +519,34 @@ async def trades_dialogue(
 
     ctx: tractor.Context,
     broker: str,
-    fqme: str,
-    loglevel: str = None,
+    fqme: str | None = None,  # if empty, we only boot broker mode
+    loglevel: str = 'warning',
 
 ) -> None:
 
     tractor.log.get_console_log(loglevel)
 
-    async with (
-        data.open_feed(
-            [fqme],
-            loglevel=loglevel,
-        ) as feed,
+    ppt: PpTable
+    ledger: TransactionLedger
+    with (
+        open_pps(
+            broker,
+            'paper',
+            write_on_exit=True,
+        ) as ppt,
+
+        open_trade_ledger(
+            broker,
+            'paper',
+        ) as ledger
     ):
-        with open_pps(broker, 'paper') as table:
-            # save pps in local state
-            _positions.update(table.pps)
+        # update pos table from ledger history
+        ppt.update_from_trans(ledger.to_trans())
 
         pp_msgs: list[BrokerdPosition] = []
         pos: Position
         token: str  # f'{symbol}.{self.broker}'
-        for token, pos in _positions.items():
+        for token, pos in ppt.pps.items():
             pp_msgs.append(BrokerdPosition(
                 broker=broker,
                 account='paper',
@@ -560,22 +560,38 @@ async def trades_dialogue(
             ['paper'],
         ))
 
+        # exit early since no fqme was passed,
+        # normally this case is just to load
+        # positions "offline".
+        if fqme is None:
+            log.warning(
+                'Paper engine only running in position delivery mode!\n'
+                'NO SIMULATED CLEARING LOOP IS ACTIVE!'
+            )
+            await trio.sleep_forever()
+            return
+
+        async with (
+            data.open_feed(
+                [fqme],
+                loglevel=loglevel,
+            ) as feed,
+        ):
             async with (
                 ctx.open_stream() as ems_stream,
                 trio.open_nursery() as n,
             ):
                 client = PaperBoi(
-                broker,
-                ems_stream,
+                    broker=broker,
+                    ems_trades_stream=ems_stream,
+                    ppt=ppt,
+                    ledger=ledger,
+
                     _buys=_buys,
                     _sells=_sells,
-
                     _reqids=_reqids,
 
-                _positions=_positions,
-
                     # TODO: load postions from ledger file
-                _trade_ledger={},
                     _syms={
                         fqme: flume.symbol
                         for fqme, flume in feed.flumes.items()
@@ -594,8 +610,9 @@ async def trades_dialogue(
 
 @acm
 async def open_paperboi(
-    fqme: str,
-    loglevel: str,
+    fqme: str | None = None,
+    broker: str | None = None,
+    loglevel: str | None = None,
 
 ) -> Callable:
     '''
@@ -603,7 +620,11 @@ async def open_paperboi(
     its context.
 
     '''
+    if not fqme:
+        assert broker, 'One of `broker` or `fqme` is required siss..!'
+    else:
         broker, symbol, expiry = unpack_fqme(fqme)
+
     service_name = f'paperboi.{broker}'
 
     async with (