Simplify updates to single-pass, fix clears minimizing

Gah, was a remaining bug where if you tried to update the pps state with
both new trades and from the ledger you'd do a double add of
transactions that were cleared during a `update_pps()` loop. Instead now
keep all clears in tact until ready to serialize to the `pps.toml` file
in which cases we call a new method `Position.minimize_clears()` which
does the work of only keep clears since the last net-zero size.

Re-implement `update_pps_conf()` update logic as a single pass loop
which does expiry and size checking for closed pps all in one pass thus
allowing us to drop `dump_active()` which was kinda redundant anyway..

piker/pp.py

@@ -20,11 +20,13 @@ that doesn't try to cuk most humans who prefer to not lose their moneys..
 (looking at you `ib` and dirt-bird friends)
 
 '''
+from collections import deque
 from contextlib import contextmanager as cm
 # from pprint import pformat
 import os
 from os import path
 import re
+import time
 from typing import (
     Any,
     Optional,
@@ -75,7 +77,9 @@ def open_trade_ledger(
         with open(tradesfile, 'w') as cf:
             pass  # touch
     with open(tradesfile, 'rb') as cf:
+        start = time.time()
         ledger = tomli.load(cf)
+        print(f'Ledger load took {time.time() - start}s')
         cpy = ledger.copy()
     try:
         yield cpy
@@ -205,6 +209,18 @@ class Position(Struct):
         '''
         return self.be_price * self.size
 
+    def update(
+        self,
+        t: Transaction,
+
+    ) -> None:
+        self.clears[t.tid] = {
+            'cost': t.cost,
+            'price': t.price,
+            'size': t.size,
+            'dt': str(t.dt),
+        }
+
     def lifo_update(
         self,
         size: float,
@@ -257,6 +273,32 @@ class Position(Struct):
 
         return new_size, self.be_price
 
+    def minimize_clears(
+        self,
+
+    ) -> dict[str, dict]:
+        '''
+        Minimize the position's clears entries by removing
+        all transactions before the last net zero size to avoid
+        unecessary history irrelevant to the current pp state.
+
+
+        '''
+        size: float = 0
+        clears_since_zero: deque[tuple(str, dict)] = deque()
+
+        # scan for the last "net zero" position by
+        # iterating clears in reverse.
+        for tid, clear in reversed(self.clears.items()):
+            size += clear['size']
+            clears_since_zero.appendleft((tid, clear))
+
+            if size == 0:
+                break
+
+        self.clears = dict(clears_since_zero)
+        return self.clears
+
 
 def update_pps(
     records: dict[str, Transaction],
@@ -310,62 +352,14 @@ def update_pps(
             cost=2*r.cost,
         )
 
-        if pp.size == 0:
-            pp.clears.clear()
-
-        else:
         # track clearing data
-            pp.clears[r.tid] = {
+        pp.update(r)
-                'cost': r.cost,
-                'price': r.price,
-                'size': r.size,
-                'dt': str(r.dt),
-            }
 
         assert len(set(pp.clears)) == len(pp.clears)
+
     return pps
 
 
-def dump_active(
-    pps: dict[str, Position],
-
-) -> tuple[
-    dict[str, Any],
-    dict[str, Any],
-]:
-    '''
-    Split pps into those that are "active" (non-zero size) and "closed"
-    (zero size) and return in 2 dicts.
-
-    Returning the "closed" set is important for updating the pps state
-    in any ``pps.toml`` such that we remove entries which are no longer
-    part of any "VaR" set (well presumably, except of course your liquidity
-    asset could be full of "risk" XD ).
-
-    '''
-    active = {}
-    closed = {}
-
-    for k, pp in pps.items():
-
-        asdict = pp.to_pretoml()
-
-        if pp.expiry is None:
-            asdict.pop('expiry', None)
-
-        if (
-            pp.size == 0
-
-            # drop time-expired positions (normally derivatives)
-            or (pp.expiry and pp.expiry < now())
-        ):
-            closed[k] = asdict
-        else:
-            active[k] = asdict
-
-    return active, closed
-
-
 def load_pps_from_ledger(
 
     brokername: str,
@@ -391,11 +385,13 @@ def load_pps_from_ledger(
             return {}
 
     brokermod = get_brokermod(brokername)
-    records = brokermod.norm_trade_records(ledger)
+    src_records = brokermod.norm_trade_records(ledger)
 
     if filter_by:
         bsuids = set(filter_by)
-        records = filter(lambda r: r.bsuid in bsuids, records)
+        records = list(filter(lambda r: r.bsuid in bsuids, src_records))
+    else:
+        records = src_records
 
     return update_pps(records)
 
@@ -709,35 +705,51 @@ def update_pps_conf(
             pps=pp_objs,
         )
 
+    pp_entries = {}  # dict-serialize all active pps
     # NOTE: newly closed position are also important to report/return
     # since a consumer, like an order mode UI ;), might want to react
     # based on the closure.
-    active, closed = dump_active(pp_objs)
-
-    # dict-serialize all active pps
-    pp_entries = {}
-
-    for bsuid, pp_dict in active.items():
-
-        # normalize to a simpler flat dict format
-        s = pp_dict.pop('symbol')
-        # TODO: we need to figure out how to have one top level
-        # listing venue here even when the backend isn't providing
-        # it via the trades ledger..
-        fqsn = s.front_fqsn()
-
-        print(f'Updating active pp: {fqsn}')
-        # XXX: ugh, it's cuz we push the section under
-        # the broker name.. maybe we need to rethink this?
-        brokerless_key = fqsn.rstrip(f'.{brokername}')
-        pp_entries[brokerless_key] = pp_dict
-
     closed_pp_objs: dict[str, Position] = {}
-    for bsuid in closed:
+
+    for bsuid in list(pp_objs):
+        pp = pp_objs[bsuid]
+        pp.minimize_clears()
+
+        if (
+            pp.size == 0
+
+            # drop time-expired positions (normally derivatives)
+            or (pp.expiry and pp.expiry < now())
+        ):
+            # if expired the position is closed
+            pp.size = 0
+
+            # position is already closed aka "net zero"
             closed_pp = pp_objs.pop(bsuid, None)
             if closed_pp:
                 closed_pp_objs[bsuid] = closed_pp
 
+        else:
+            # serialize to pre-toml form
+            asdict = pp.to_pretoml()
+
+            if pp.expiry is None:
+                asdict.pop('expiry', None)
+
+            # TODO: we need to figure out how to have one top level
+            # listing venue here even when the backend isn't providing
+            # it via the trades ledger..
+            # drop symbol obj in serialized form
+            s = asdict.pop('symbol')
+            fqsn = s.front_fqsn()
+            print(f'Updating active pp: {fqsn}')
+
+            # XXX: ugh, it's cuz we push the section under
+            # the broker name.. maybe we need to rethink this?
+            brokerless_key = fqsn.rstrip(f'.{brokername}')
+
+            pp_entries[brokerless_key] = asdict
+
     conf[brokername][acctid] = pp_entries
 
     # TODO: why tf haven't they already done this for inline tables smh..