Factor `Pair` schema-mismatch handling to `_util`

Add `get_or_raise_on_pair_schema_mismatch()` helper
and `SchemaMismatch` error type in `brokers._util`
to standardize the "provider changed their API" error
reporting across backends.

Deats,
- add `SchemaMismatch(BrokerError)` exc type.
- `get_or_raise_on_pair_schema_mismatch()`: catch
  `TypeError` on `Pair` ctor, build `ppfmt()`-ed
  report with provider name, fall back to
  `pair_type._api_url` if no explicit URL passed,
  then raise `SchemaMismatch`.
- binance `api.py`: replace inline `try/except` +
  `e.add_note()` with the new helper.
- kraken `api.py`: replace bare `Pair(...)` ctor
  with the new helper inside crash handler.

Also,
- add `_api_url: ClassVar[str]` to binance
  `FutesPair` and kraken `Pair` structs.
- binance `feed.py`: warn on missing `.<provider>`
  in fqme; raise `SymbolNotFound` on empty venue.
- reformat `start_dt`/`end_dt` unions to
  `datetime|None` style in binance `Client`.
- wrap binance `_pairs` lookup in
  `maybe_open_crash_handler()`.

(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

piker/brokers/_util.py

@@ -20,10 +20,14 @@ Handy cross-broker utils.
 """
 from __future__ import annotations
 # from functools import partial
+from typing import (
+    Type,
+)
 
 import json
 import httpx
 import logging
+from msgspec import Struct
 
 from piker.log import (
     colorize_json,
@@ -97,6 +101,12 @@ class DataThrottle(BrokerError):
     '''
     # TODO: add in throttle metrics/feedback
 
+class SchemaMismatch(BrokerError):
+    '''
+    Market `Pair` fields mismatch, likely due to provider API update.
+
+    '''
+
 
 def resproc(
     resp: httpx.Response,
@@ -123,3 +133,45 @@ def resproc(
         log.debug(f"Received json contents:\n{colorize_json(msg)}")
 
     return msg if return_json else resp
+
+
+def get_or_raise_on_pair_schema_mismatch(
+    pair_type: Type[Struct],
+    fields_data: dict,
+    provider_name: str,
+    api_url: str|None = None,
+) -> Struct:
+    '''
+    Boilerplate helper around assset-`Pair` field schema mismatches,
+    normally due to provider API updates.
+
+    '''
+    try:
+        pair: Struct = pair_type(**fields_data)
+        return pair
+    except TypeError as err:
+
+        from tractor.devx.pformat import ppfmt
+        repr_data: str = ppfmt(fields_data)
+        report: str = (
+            f'Field mismatch we need to codify!\n'
+            f'\n'
+            f'{pair_type!r}({repr_data})'
+            f'\n'
+            f'^^^ {err.args[0]!r} ^^^\n'
+            f'\n'
+            f"Don't panic, prolly {provider_name!r} "
+            f"changed their symbology schema..\n"
+        )
+        if (
+            api_url
+            or
+            (api_url := pair_type._api_url)
+        ):
+            report += (
+                f'\n'
+                f'Check out their API docs here:\n'
+                f'{api_url}\n'
+            )
+
+        raise SchemaMismatch(report) from err

piker/brokers/binance/api.py

@@ -49,6 +49,9 @@ from piker import config
 from piker.clearing._messages import (
     Order,
 )
+from piker.brokers._util import (
+    get_or_raise_on_pair_schema_mismatch,
+)
 from piker.accounting import (
     Asset,
     digits_to_dec,
@@ -370,20 +373,12 @@ class Client:
                 item['filters'] = filters
 
             pair_type: Type = PAIRTYPES[venue]
-            try:
+            pair: Pair = get_or_raise_on_pair_schema_mismatch(
-                pair: Pair = pair_type(**item)
+                pair_type=pair_type,
-            except Exception as e:
+                fields_data=item,
-                e.add_note(
+                provider_name='binance',
-                    f'\n'
+                api_url='https://binance-docs.github.io/apidocs/spot/en/#exchange-information',
-                    f'New or removed field we need to codify!\n'
+            )
-                    f'pair-type: {pair_type!r}\n'
-                    f'\n'
-                    f"Don't panic, prolly stupid binance changed their symbology schema again..\n"
-                    f'Check out their API docs here:\n'
-                    f'\n'
-                    f'https://binance-docs.github.io/apidocs/spot/en/#exchange-information\n'
-                )
-                raise
             pair_table[pair.symbol.upper()] = pair
 
             # update an additional top-level-cross-venue-table
@@ -581,8 +576,8 @@ class Client:
         self,
         mkt: MktPair,
 
-        start_dt: datetime | None = None,
+        start_dt: datetime|None = None,
-        end_dt: datetime | None = None,
+        end_dt: datetime|None = None,
 
         as_np: bool = True,
 
@@ -609,7 +604,11 @@ class Client:
         start_time = binance_timestamp(start_dt)
         end_time = binance_timestamp(end_dt)
 
-        bs_pair: Pair = self._pairs[mkt.bs_fqme.upper()]
+        import tractor
+        with tractor.devx.maybe_open_crash_handler():
+            bs_pair: Pair = self._pairs[
+                mkt.bs_fqme.upper()
+            ]
 
         # https://binance-docs.github.io/apidocs/spot/en/#kline-candlestick-data
         bars = await self._api(

piker/brokers/binance/feed.py

@@ -48,6 +48,7 @@ import tractor
 from piker.brokers import (
     open_cached_client,
     NoData,
+    SymbolNotFound,
 )
 from piker._cacheables import (
     async_lifo_cache,
@@ -305,6 +306,10 @@ async def get_mkt_info(
 
     # uppercase since kraken bs_mktid is always upper
     if 'binance' not in fqme.lower():
+        log.warning(
+            f'Missing `.<provider>` part in fqme ??\n'
+            f'fqme: {fqme!r}\n'
+        )
         fqme += '.binance'
 
     mkt_mode: str = ''
@@ -319,6 +324,12 @@ async def get_mkt_info(
     venue: str = venue.upper()
     venue_lower: str = venue.lower()
 
+    if not venue:
+        raise SymbolNotFound(
+            f'Invalid or missing .<venue> part in fqme?\n'
+            f'fqme: {fqme!r}\n'
+        )
+
     # XXX TODO: we should change the usdtm_futes name to just
     # usdm_futes (dropping the tether part) since it turns out that
     # there are indeed USD-tokens OTHER THEN tether being used as
@@ -360,6 +371,8 @@ async def get_mkt_info(
         if not mkt_mode:
             mkt_mode: str = f'{venue_lower}_futes'
 
+    await tractor.pause()
+
     async with open_cached_client(
         'binance',
     ) as client:

piker/brokers/binance/venues.py

@@ -20,6 +20,7 @@ Per market data-type definitions and schemas types.
 """
 from __future__ import annotations
 from typing import (
+    ClassVar,
     Literal,
 )
 from decimal import Decimal
@@ -203,6 +204,8 @@ class FutesPair(Pair):
     # NOTE: see `.data._symcache.SymbologyCache.load()` for why
     ns_path: str = 'piker.brokers.binance:FutesPair'
 
+    _api_url: ClassVar[str] = 'https://binance-docs.github.io/apidocs/spot/en/#exchange-information'
+
     # NOTE: for compat with spot pairs and `MktPair.src: Asset`
     # processing..
     @property

piker/brokers/kraken/api.py

@@ -52,6 +52,7 @@ from piker.brokers._util import (
     SymbolNotFound,
     BrokerError,
     DataThrottle,
+    get_or_raise_on_pair_schema_mismatch,
 )
 from piker.accounting import Transaction
 from piker.log import get_logger
@@ -502,7 +503,16 @@ class Client:
 
                 # NOTE: always cache in pairs tables for faster lookup
                 with tractor.devx.maybe_open_crash_handler(): # as bxerr:
-                    pair = Pair(xname=xkey, **data)
+                    # pair = Pair(xname=xkey, **data)
+                    pair: Pair = get_or_raise_on_pair_schema_mismatch(
+                        pair_type=Pair,
+                        fields_data=dict(
+                            xname=xkey,
+                            **data,
+                        ),
+                        provider_name='kraken',
+                        # api_url='https://binance-docs.github.io/apidocs/spot/en/#exchange-information',
+                    )
 
                 # register the above `Pair` structs for all
                 # key-sets/monikers: a set of 4 (frickin) tables

piker/brokers/kraken/symbols.py

@@ -19,6 +19,9 @@ Symbology defs and search.
 
 '''
 from decimal import Decimal
+from typing import (
+    ClassVar,
+)
 
 import tractor
 
@@ -86,9 +89,14 @@ class Pair(Struct):
     short_position_limit: float = 0
     long_position_limit: float = float('inf')
 
+    # TODO, add API note when this was added!
+    # execution_venue: str|None = None
+
     # TODO: should we make this a literal NamespacePath ref?
     ns_path: str = 'piker.brokers.kraken:Pair'
 
+    _api_url: ClassVar[str] = 'https://docs.kraken.com/api/docs/rest-api/get-tradable-asset-pairs'
+
     @property
     def bs_mktid(self) -> str:
         '''