Import adjustments to allow msg codec overriding in `tractor`

Syncs with https://github.com/goodboy/tractor/pull/311
which is nowhere near ready and this approach didn't end up being
as straight forward as hoped. We're going to need a top level
`Msg`-boxing type/protocol in `tractor` first...

piker/_daemon.py

@@ -22,13 +22,13 @@ from typing import Optional, Union, Callable, Any
 from contextlib import asynccontextmanager as acm
 from collections import defaultdict
 
-from msgspec import Struct
 import tractor
 import trio
 from trio_typing import TaskStatus
 
 from .log import get_logger, get_console_log
 from .brokers import get_brokermod
+from .data.types import Struct
 
 
 log = get_logger(__name__)
@@ -204,6 +204,9 @@ async def open_piker_runtime(
     assert _services is None
 
     # XXX: this may open a root actor as well
+    with tractor.msg.configure_native_msgs(
+        [Struct],
+    ):
         async with (
             tractor.open_root_actor(
 
@@ -260,6 +263,10 @@ async def maybe_open_pikerd(
     if loglevel:
         get_console_log(loglevel)
 
+    # XXX: this may open a root actor as well
+    with tractor.msg.configure_native_msgs(
+        [Struct],
+    ):
         # subtle, we must have the runtime up here or portal lookup will fail
         async with maybe_open_runtime(loglevel, **kwargs):
 
@@ -442,7 +449,7 @@ async def spawn_brokerd(
     )
 
     # non-blocking setup of brokerd service nursery
-    from .data import _setup_persistent_brokerd
+    from .data.feed import _setup_persistent_brokerd
 
     await _services.start_service_task(
         dname,

piker/brokers/ib/broker.py

@@ -148,7 +148,7 @@ async def handle_order_requests(
                 oid=request_msg['oid'],
                 symbol=request_msg['symbol'],
                 reason=f'No account found: `{account}` ?',
-            ).dict())
+            ))
             continue
 
         client = _accounts2clients.get(account)
@@ -161,7 +161,7 @@ async def handle_order_requests(
                 oid=request_msg['oid'],
                 symbol=request_msg['symbol'],
                 reason=f'No api client loaded for account: `{account}` ?',
-            ).dict())
+            ))
             continue
 
         if action in {'buy', 'sell'}:
@@ -188,7 +188,7 @@ async def handle_order_requests(
                     oid=request_msg['oid'],
                     symbol=request_msg['symbol'],
                     reason='Order already active?',
-                ).dict())
+                ))
 
             # deliver ack that order has been submitted to broker routing
             await ems_order_stream.send(
@@ -197,9 +197,8 @@ async def handle_order_requests(
                     oid=order.oid,
                     # broker specific request id
                     reqid=reqid,
-                    time_ns=time.time_ns(),
                     account=account,
-                ).dict()
+                )
             )
 
         elif action == 'cancel':
@@ -559,7 +558,7 @@ async def trades_dialogue(
                     cids2pps,
                     validate=True,
                 )
-                all_positions.extend(msg.dict() for msg in msgs)
+                all_positions.extend(msg for msg in msgs)
 
         if not all_positions and cids2pps:
             raise RuntimeError(
@@ -665,7 +664,7 @@ async def emit_pp_update(
             msg = msgs[0]
             break
 
-    await ems_stream.send(msg.dict())
+    await ems_stream.send(msg)
 
 
 async def deliver_trade_events(
@@ -743,7 +742,7 @@ async def deliver_trade_events(
 
                     broker_details={'name': 'ib'},
                 )
-                await ems_stream.send(msg.dict())
+                await ems_stream.send(msg)
 
             case 'fill':
 
@@ -803,7 +802,7 @@ async def deliver_trade_events(
                     broker_time=trade_entry['broker_time'],
 
                 )
-                await ems_stream.send(msg.dict())
+                await ems_stream.send(msg)
 
                 # 2 cases:
                 # - fill comes first or
@@ -879,7 +878,7 @@ async def deliver_trade_events(
                 cid, msg = pack_position(item)
                 # acctid = msg.account = accounts_def.inverse[msg.account]
                 # cuck ib and it's shitty fifo sys for pps!
-                # await ems_stream.send(msg.dict())
+                # await ems_stream.send(msg)
 
             case 'event':
 
@@ -891,7 +890,7 @@ async def deliver_trade_events(
                 # level...
                 # reqid = item.get('reqid', 0)
                 # if getattr(msg, 'reqid', 0) < -1:
-                # log.info(f"TWS triggered trade\n{pformat(msg.dict())}")
+                # log.info(f"TWS triggered trade\n{pformat(msg)}")
 
                 # msg.reqid = 'tws-' + str(-1 * reqid)
 

piker/brokers/kraken/broker.py

@@ -184,7 +184,7 @@ async def handle_order_requests(
                             'Invalid request msg:\n{msg}'
                         ),
 
-                    ).dict()
+                    )
                 )
 
 
@@ -282,7 +282,7 @@ async def trades_dialogue(
                     avg_price=p.be_price,
                     currency='',
                 )
-                position_msgs.append(msg.dict())
+                position_msgs.append(msg)
 
         await ctx.started(
             (position_msgs, [acc_name])
@@ -405,7 +405,7 @@ async def handle_order_updates(
                         broker_details={'name': 'kraken'},
                         broker_time=broker_time
                     )
-                    await ems_stream.send(fill_msg.dict())
+                    await ems_stream.send(fill_msg)
 
                     filled_msg = BrokerdStatus(
                         reqid=reqid,
@@ -429,7 +429,7 @@ async def handle_order_updates(
                         # https://github.com/pikers/piker/issues/296
                         remaining=0,
                     )
-                    await ems_stream.send(filled_msg.dict())
+                    await ems_stream.send(filled_msg)
 
                 # update ledger and position tracking
                 with open_ledger(acctid, trades) as trans:
@@ -466,7 +466,7 @@ async def handle_order_updates(
                         # TODO
                         # currency=''
                     )
-                    await ems_stream.send(pp_msg.dict())
+                    await ems_stream.send(pp_msg)
 
             # process and relay order state change events
             # https://docs.kraken.com/websockets/#message-openOrders
@@ -563,7 +563,7 @@ async def handle_order_updates(
                                 ),
                             )
                             msgs.append(resp)
-                            await ems_stream.send(resp.dict())
+                            await ems_stream.send(resp)
 
                         case _:
                             log.warning(
@@ -603,7 +603,7 @@ async def handle_order_updates(
 
                 msgs.extend(resps)
                 for resp in resps:
-                    await ems_stream.send(resp.dict())
+                    await ems_stream.send(resp)
 
             case _:
                 log.warning(f'Unhandled trades update msg: {msg}')

piker/clearing/_allocate.py

@@ -22,10 +22,9 @@ from enum import Enum
 from typing import Optional
 
 from bidict import bidict
-from pydantic import BaseModel, validator
-# from msgspec import Struct
 
 from ..data._source import Symbol
+from ..data.types import Struct
 from ..pp import Position
 
 
@@ -41,33 +40,30 @@ SizeUnit = Enum(
 )
 
 
-class Allocator(BaseModel):
-
-    class Config:
-        validate_assignment = True
-        copy_on_model_validation = False
-        arbitrary_types_allowed = True
-
-        # required to get the account validator lookup working?
-        extra = 'allow'
-        underscore_attrs_are_private = False
+class Allocator(Struct):
 
     symbol: Symbol
     account: Optional[str] = 'paper'
+
+    _size_units: bidict[str, Optional[str]] = _size_units
+
     # TODO: for enums this clearly doesn't fucking work, you can't set
     # a default at startup by passing in a `dict` but yet you can set
     # that value through assignment..for wtv cucked reason.. honestly, pure
     # unintuitive garbage.
-    size_unit: str = 'currency'
-    _size_units: dict[str, Optional[str]] = _size_units
+    _size_unit: str = 'currency'
 
-    @validator('size_unit', pre=True)
-    def maybe_lookup_key(cls, v):
-        # apply the corresponding enum key for the text "description" value
+    @property
+    def size_unit(self) -> str:
+        return self._size_unit
+
+    @size_unit.setter
+    def size_unit(self, v: str) -> Optional[str]:
         if v not in _size_units:
-            return _size_units.inverse[v]
+            v = _size_units.inverse[v]
 
         assert v in _size_units
+        self._size_unit = v
         return v
 
     # TODO: if we ever want ot support non-uniform entry-slot-proportion
@@ -262,7 +258,7 @@ def mk_allocator(
     # default allocation settings
     defaults: dict[str, float] = {
         'account': None,  # select paper by default
-        'size_unit': 'currency',
+        # 'size_unit': 'currency',
         'units_limit': 400,
         'currency_limit': 5e3,
         'slots': 4,
@@ -301,6 +297,9 @@ def mk_allocator(
         # entry step 1.0
         alloc.units_limit = alloc.slots
 
+    else:
+        alloc.size_unit = 'currency'
+
     # if the current position is already greater then the limit
     # settings, increase the limit to the current position
     if alloc.size_unit == 'currency':

piker/clearing/_client.py

@@ -58,11 +58,11 @@ class OrderBook:
 
     def send(
         self,
-        msg: Order,
+        msg: Order | dict,
 
     ) -> dict:
         self._sent_orders[msg.oid] = msg
-        self._to_ems.send_nowait(msg.dict())
+        self._to_ems.send_nowait(msg)
         return msg
 
     def update(
@@ -73,9 +73,8 @@ class OrderBook:
 
     ) -> dict:
         cmd = self._sent_orders[uuid]
-        msg = cmd.dict()
-        msg.update(data)
-        self._sent_orders[uuid] = Order(**msg)
+        msg = cmd.copy(update=data)
+        self._sent_orders[uuid] = msg
         self._to_ems.send_nowait(msg)
         return cmd
 
@@ -88,7 +87,7 @@ class OrderBook:
             oid=uuid,
             symbol=cmd.symbol,
         )
-        self._to_ems.send_nowait(msg.dict())
+        self._to_ems.send_nowait(msg)
 
 
 _orders: OrderBook = None
@@ -149,7 +148,7 @@ async def relay_order_cmds_from_sync_code(
     book = get_orders()
     async with book._from_order_book.subscribe() as orders_stream:
         async for cmd in orders_stream:
-            if cmd['symbol'] == symbol_key:
+            if cmd.symbol == symbol_key:
                 log.info(f'Send order cmd:\n{pformat(cmd)}')
                 # send msg over IPC / wire
                 await to_ems_stream.send(cmd)

piker/clearing/_ems.py

@@ -20,6 +20,7 @@ In da suit parlances: "Execution management systems"
 """
 from contextlib import asynccontextmanager
 from dataclasses import dataclass, field
+from math import isnan
 from pprint import pformat
 import time
 from typing import AsyncIterator, Callable
@@ -231,7 +232,7 @@ async def clear_dark_triggers(
                             price=submit_price,
                             size=cmd['size'],
                         )
-                        await brokerd_orders_stream.send(msg.dict())
+                        await brokerd_orders_stream.send(msg)
 
                         # mark this entry as having sent an order
                         # request.  the entry will be replaced once the
@@ -247,14 +248,11 @@ async def clear_dark_triggers(
 
                     msg = Status(
                         oid=oid,  # ems order id
-                        resp=resp,
                         time_ns=time.time_ns(),
-                        symbol=fqsn,
+                        resp=resp,
                         trigger_price=price,
-                        broker_details={'name': broker},
-                        cmd=cmd,  # original request message
-
-                    ).dict()
+                        brokerd_msg=cmd,
+                    )
 
                     # remove exec-condition from set
                     log.info(f'removing pred for {oid}')
@@ -577,11 +575,11 @@ async def translate_and_relay_brokerd_events(
 
         if name == 'position':
 
-            pos_msg = BrokerdPosition(**brokerd_msg).dict()
+            pos_msg = BrokerdPosition(**brokerd_msg)
 
             # XXX: this will be useful for automatic strats yah?
             # keep pps per account up to date locally in ``emsd`` mem
-            sym, broker = pos_msg['symbol'], pos_msg['broker']
+            sym, broker = pos_msg.symbol, pos_msg.broker
 
             relay.positions.setdefault(
                 # NOTE: translate to a FQSN!
@@ -683,7 +681,7 @@ async def translate_and_relay_brokerd_events(
                     entry.reqid = reqid
 
                     # tell broker to cancel immediately
-                    await brokerd_trades_stream.send(entry.dict())
+                    await brokerd_trades_stream.send(entry)
 
                 # - the order is now active and will be mirrored in
                 # our book -> registered as live flow
@@ -723,7 +721,7 @@ async def translate_and_relay_brokerd_events(
             # if 10147 in message: cancel
 
             resp = 'broker_errored'
-            broker_details = msg.dict()
+            broker_details = msg
 
             # don't relay message to order requester client
             # continue
@@ -758,7 +756,7 @@ async def translate_and_relay_brokerd_events(
                 resp = 'broker_' + msg.status
 
             # pass the BrokerdStatus msg inside the broker details field
-            broker_details = msg.dict()
+            broker_details = msg
 
         elif name in (
             'fill',
@@ -767,7 +765,7 @@ async def translate_and_relay_brokerd_events(
 
             # proxy through the "fill" result(s)
             resp = 'broker_filled'
-            broker_details = msg.dict()
+            broker_details = msg
 
             log.info(f'\nFill for {oid} cleared with:\n{pformat(resp)}')
 
@@ -785,7 +783,7 @@ async def translate_and_relay_brokerd_events(
                     time_ns=time.time_ns(),
                     broker_reqid=reqid,
                     brokerd_msg=broker_details,
-                ).dict()
+                )
             )
         except KeyError:
             log.error(
@@ -857,7 +855,7 @@ async def process_client_order_cmds(
                         f'Submitting cancel for live order {reqid}'
                     )
 
-                    await brokerd_order_stream.send(msg.dict())
+                    await brokerd_order_stream.send(msg)
 
                 else:
                     # this might be a cancel for an order that hasn't been
@@ -879,7 +877,7 @@ async def process_client_order_cmds(
                             resp='dark_cancelled',
                             oid=oid,
                             time_ns=time.time_ns(),
-                        ).dict()
+                        )
                     )
                     # de-register this client dialogue
                     router.dialogues.pop(oid)
@@ -934,7 +932,7 @@ async def process_client_order_cmds(
                 # handle relaying the ems side responses back to
                 # the client/cmd sender from this request
                 log.info(f'Sending live order to {broker}:\n{pformat(msg)}')
-                await brokerd_order_stream.send(msg.dict())
+                await brokerd_order_stream.send(msg)
 
                 # an immediate response should be ``BrokerdOrderAck``
                 # with ems order id from the ``trades_dialogue()``
@@ -959,6 +957,12 @@ async def process_client_order_cmds(
                 # like every other shitty tina platform that makes
                 # the user choose the predicate operator.
                 last = dark_book.lasts[fqsn]
+
+                # sometimes the real-time feed hasn't come up
+                # so just pull from the latest history.
+                if isnan(last):
+                    last = feed.shm.array[-1]['close']
+
                 pred = mk_check(trigger_price, last, action)
 
                 spread_slap: float = 5
@@ -1008,7 +1012,7 @@ async def process_client_order_cmds(
                         resp=resp,
                         oid=oid,
                         time_ns=time.time_ns(),
-                    ).dict()
+                    )
                 )
 
 
@@ -1146,8 +1150,14 @@ async def _emsd_main(
                     )
 
                 finally:
-                    # remove client from "registry"
+                    # try to remove client from "registry"
+                    try:
                         _router.clients.remove(ems_client_order_stream)
+                    except KeyError:
+                        log.warning(
+                            f'Stream {ems_client_order_stream._ctx.chan.uid}'
+                            ' was already dropped?'
+                        )
 
                     dialogues = _router.dialogues
 

piker/clearing/_messages.py

@@ -20,16 +20,15 @@ Clearing system messagingn types and protocols.
 """
 from typing import Optional, Union
 
-# TODO: try out just encoding/send direction for now?
-# import msgspec
-from pydantic import BaseModel
-
 from ..data._source import Symbol
+from ..data.types import Struct
 
+
+# --------------
 # Client -> emsd
+# --------------
 
-
-class Cancel(BaseModel):
+class Cancel(Struct):
     '''Cancel msg for removing a dark (ems triggered) or
     broker-submitted (live) trigger/order.
 
@@ -39,7 +38,7 @@ class Cancel(BaseModel):
     symbol: str
 
 
-class Order(BaseModel):
+class Order(Struct):
 
     action: str  # {'buy', 'sell', 'alert'}
     # internal ``emdsd`` unique "order id"
@@ -59,20 +58,14 @@ class Order(BaseModel):
     # the backend broker
     exec_mode: str  # {'dark', 'live', 'paper'}
 
-    class Config:
-        # just for pre-loading a ``Symbol`` when used
-        # in the order mode staging process
-        arbitrary_types_allowed = True
-        # don't copy this model instance when used in
-        # a recursive model
-        copy_on_model_validation = False
 
+# --------------
 # Client <- emsd
+# --------------
 # update msgs from ems which relay state change info
 # from the active clearing engine.
 
-
-class Status(BaseModel):
+class Status(Struct):
 
     name: str = 'status'
     oid: str  # uuid4
@@ -95,8 +88,6 @@ class Status(BaseModel):
     # }
     resp: str  # "response", see above
 
-    # symbol: str
-
     # trigger info
     trigger_price: Optional[float] = None
     # price: float
@@ -111,10 +102,12 @@ class Status(BaseModel):
     brokerd_msg: dict = {}
 
 
+# ---------------
 # emsd -> brokerd
+# ---------------
 # requests *sent* from ems to respective backend broker daemon
 
-class BrokerdCancel(BaseModel):
+class BrokerdCancel(Struct):
 
     action: str = 'cancel'
     oid: str  # piker emsd order id
@@ -130,7 +123,7 @@ class BrokerdCancel(BaseModel):
     reqid: Optional[Union[int, str]] = None
 
 
-class BrokerdOrder(BaseModel):
+class BrokerdOrder(Struct):
 
     action: str  # {buy, sell}
     oid: str
@@ -150,11 +143,12 @@ class BrokerdOrder(BaseModel):
     size: float
 
 
+# ---------------
 # emsd <- brokerd
+# ---------------
 # requests *received* to ems from broker backend
 
-
-class BrokerdOrderAck(BaseModel):
+class BrokerdOrderAck(Struct):
     '''
     Immediate reponse to a brokerd order request providing the broker
     specific unique order id so that the EMS can associate this
@@ -172,7 +166,7 @@ class BrokerdOrderAck(BaseModel):
     account: str = ''
 
 
-class BrokerdStatus(BaseModel):
+class BrokerdStatus(Struct):
 
     name: str = 'status'
     reqid: Union[int, str]
@@ -205,7 +199,7 @@ class BrokerdStatus(BaseModel):
     }
 
 
-class BrokerdFill(BaseModel):
+class BrokerdFill(Struct):
     '''
     A single message indicating a "fill-details" event from the broker
     if avaiable.
@@ -230,7 +224,7 @@ class BrokerdFill(BaseModel):
     broker_time: float
 
 
-class BrokerdError(BaseModel):
+class BrokerdError(Struct):
     '''
     Optional error type that can be relayed to emsd for error handling.
 
@@ -249,7 +243,7 @@ class BrokerdError(BaseModel):
     broker_details: dict = {}
 
 
-class BrokerdPosition(BaseModel):
+class BrokerdPosition(Struct):
     '''Position update event from brokerd.
 
     '''

piker/clearing/_paper_engine.py

@@ -30,8 +30,8 @@ import trio
 import tractor
 from dataclasses import dataclass
 
-from .. import data
 from ..data._source import Symbol
+from ..data.feed import open_feed
 from ..pp import Position
 from ..data._normalize import iterticks
 from ..data._source import unpack_fqsn
@@ -117,7 +117,7 @@ class PaperBoi:
             reason='paper_trigger',
             remaining=size,
         )
-        await self.ems_trades_stream.send(msg.dict())
+        await self.ems_trades_stream.send(msg)
 
         # if we're already a clearing price simulate an immediate fill
         if (
@@ -173,7 +173,7 @@ class PaperBoi:
             broker=self.broker,
             time_ns=time.time_ns(),
         )
-        await self.ems_trades_stream.send(msg.dict())
+        await self.ems_trades_stream.send(msg)
 
     async def fake_fill(
         self,
@@ -216,7 +216,7 @@ class PaperBoi:
                 'name': self.broker + '_paper',
             },
         )
-        await self.ems_trades_stream.send(msg.dict())
+        await self.ems_trades_stream.send(msg)
 
         if order_complete:
 
@@ -240,7 +240,7 @@ class PaperBoi:
                     'name': self.broker,
                 },
             )
-            await self.ems_trades_stream.send(msg.dict())
+            await self.ems_trades_stream.send(msg)
 
         # lookup any existing position
         token = f'{symbol}.{self.broker}'
@@ -268,7 +268,7 @@ class PaperBoi:
         )
         pp_msg.size, pp_msg.avg_price = pp.lifo_update(size, price)
 
-        await self.ems_trades_stream.send(pp_msg.dict())
+        await self.ems_trades_stream.send(pp_msg)
 
 
 async def simulate_fills(
@@ -384,7 +384,7 @@ async def handle_order_requests(
                     oid=request_msg['oid'],
                     symbol=request_msg['symbol'],
                     reason=f'Paper only. No account found: `{account}` ?',
-                ).dict())
+                ))
                 continue
 
             # validate
@@ -416,7 +416,7 @@ async def handle_order_requests(
                     # broker specific request id
                     reqid=reqid,
 
-                ).dict()
+                )
             )
 
         elif action == 'cancel':
@@ -441,14 +441,11 @@ async def trades_dialogue(
 ) -> None:
     tractor.log.get_console_log(loglevel)
 
-    async with (
-
-        data.open_feed(
+    async with open_feed(
         [fqsn],
         loglevel=loglevel,
-        ) as feed,
+    ) as feed:
 
-    ):
         # TODO: load paper positions per broker from .toml config file
         # and pass as symbol to position data mapping: ``dict[str, dict]``
         # await ctx.started(all_positions)

piker/data/__init__.py

@@ -30,19 +30,19 @@ from ._sharedmem import (
     get_shm_token,
     ShmArray,
 )
-from .feed import (
-    open_feed,
-    _setup_persistent_brokerd,
-)
+# from .feed import (
+#     # open_feed,
+#     _setup_persistent_brokerd,
+# )
 
 
 __all__ = [
-    'open_feed',
+    # 'open_feed',
     'ShmArray',
     'iterticks',
     'maybe_open_shm_array',
     'attach_shm_array',
     'open_shm_array',
     'get_shm_token',
-    '_setup_persistent_brokerd',
+    # '_setup_persistent_brokerd',
 ]

piker/data/_ahab.py

@@ -51,10 +51,6 @@ class DockerNotStarted(Exception):
     'Prolly you dint start da daemon bruh'
 
 
-class ContainerError(RuntimeError):
-    'Error reported via app-container logging level'
-
-
 @acm
 async def open_docker(
     url: Optional[str] = None,
@@ -189,7 +185,7 @@ class Container:
     def hard_kill(self, start: float) -> None:
         delay = time.time() - start
         log.error(
-            f'Failed to kill container {cid} after {delay}s\n'
+            f'Failed to kill container {self.cntr.id} after {delay}s\n'
             'sending SIGKILL..'
         )
         # get out the big guns, bc apparently marketstore

piker/data/_sharedmem.py

@@ -128,12 +128,15 @@ class _Token(Struct, frozen=True):
 
     @classmethod
     def from_msg(cls, msg: dict) -> _Token:
-        if isinstance(msg, _Token):
-            return msg
 
         # TODO: native struct decoding
         # return _token_dec.decode(msg)
 
+        if isinstance(msg, _Token):
+            return msg
+
+        # assert 0
+
         msg['dtype_descr'] = tuple(map(tuple, msg['dtype_descr']))
         return _Token(**msg)
 

piker/data/types.py

@@ -0,0 +1,68 @@
+# piker: trading gear for hackers
+# Copyright (C) Guillermo Rodriguez (in stewardship for piker0)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""
+Built-in (extension) types.
+
+"""
+from typing import Optional
+from pprint import pformat
+
+import msgspec
+
+
+class Struct(
+    msgspec.Struct,
+
+    # https://jcristharif.com/msgspec/structs.html#tagged-unions
+    # tag='pikerstruct',
+    # tag=True,
+):
+    '''
+    A "human friendlier" (aka repl buddy) struct subtype.
+
+    '''
+    def to_dict(self) -> dict:
+        return {
+            f: getattr(self, f)
+            for f in self.__struct_fields__
+        }
+
+    def __repr__(self):
+        return f'Struct({pformat(self.to_dict())})'
+
+    def copy(
+        self,
+        update: Optional[dict] = None,
+
+    ) -> msgspec.Struct:
+        '''
+        Validate-typecast all self defined fields, return a copy of us
+        with all such fields.
+
+        This is kinda like the default behaviour in `pydantic.BaseModel`.
+
+        '''
+        if update:
+            for k, v in update.items():
+                setattr(self, k, v)
+
+        # roundtrip serialize to validate
+        return msgspec.msgpack.Decoder(
+            type=type(self)
+        ).decode(
+            msgspec.msgpack.Encoder().encode(self)
+        )

piker/ui/_forms.py

@@ -619,7 +619,7 @@ class FillStatusBar(QProgressBar):
         # color: #19232D;
         # width: 10px;
 
-        self.setRange(0, slots)
+        self.setRange(0, int(slots))
         self.setValue(value)
 
 

piker/ui/order_mode.py

@@ -264,7 +264,8 @@ class OrderMode:
         self,
 
     ) -> OrderDialog:
-        '''Send execution order to EMS return a level line to
+        '''
+        Send execution order to EMS return a level line to
         represent the order on a chart.
 
         '''
@@ -273,13 +274,9 @@ class OrderMode:
         oid = str(uuid.uuid4())
 
         # format order data for ems
-        fqsn = symbol.front_fqsn()
-        order = staged.copy(
-            update={
-                'symbol': fqsn,
-                'oid': oid,
-            }
-        )
+        order = staged.copy()
+        order.oid = oid
+        order.symbol = symbol.front_fqsn()
 
         line = self.line_from_order(
             order,