Extract ExchangePayload updating

freqtrade/rpc/api_server/api_background_tasks.py

@@ -8,8 +8,8 @@ from freqtrade.constants import Config
 from freqtrade.enums import CandleType
 from freqtrade.exceptions import OperationalException
 from freqtrade.rpc.api_server.api_schemas import (BackgroundTaskStatus, BgJobStarted,
-                                                  PairListsPayload, PairListsResponse,
+                                                  ExchangeModePayloadMixin, PairListsPayload,
-                                                  WhitelistEvaluateResponse)
+                                                  PairListsResponse, WhitelistEvaluateResponse)
 from freqtrade.rpc.api_server.deps import get_config, get_exchange
 from freqtrade.rpc.api_server.webserver_bgwork import ApiBG
 
@@ -85,12 +85,7 @@ def pairlists_evaluate(payload: PairListsPayload, background_tasks: BackgroundTa
     config_loc = deepcopy(config)
     config_loc['stake_currency'] = payload.stake_currency
     config_loc['pairlists'] = payload.pairlists
-    if payload.exchange:
+    handleExchangePayload(payload, config_loc)
-        config_loc['exchange']['name'] = payload.exchange
-    if payload.trading_mode:
-        config_loc['trading_mode'] = payload.trading_mode
-        config_loc['candle_type_def'] = CandleType.get_default(
-            config_loc.get('trading_mode', 'spot') or 'spot')
     # TODO: overwrite blacklist? make it optional and fall back to the one in config?
     # Outcome depends on the UI approach.
     config_loc['exchange']['pair_blacklist'] = payload.blacklist
@@ -114,6 +109,19 @@ def pairlists_evaluate(payload: PairListsPayload, background_tasks: BackgroundTa
     }
 
 
+def handleExchangePayload(payload: ExchangeModePayloadMixin, config_loc: Config):
+    """
+    Handle exchange and trading mode payload.
+    Updates the configuration with the payload values.
+    """
+    if payload.exchange:
+        config_loc['exchange']['name'] = payload.exchange
+    if payload.trading_mode:
+        config_loc['trading_mode'] = payload.trading_mode
+        config_loc['candle_type_def'] = CandleType.get_default(
+            config_loc.get('trading_mode', 'spot') or 'spot')
+
+
 @router.get('/pairlists/evaluate/{jobid}', response_model=WhitelistEvaluateResponse,
             tags=['pairlists'])
 def pairlists_evaluate_get(jobid: str):

freqtrade/rpc/api_server/api_schemas.py

@@ -7,6 +7,11 @@ from freqtrade.constants import DATETIME_PRINT_FORMAT, IntOrInf
 from freqtrade.enums import OrderTypeValues, SignalDirection, TradingMode
 
 
+class ExchangeModePayloadMixin(BaseModel):
+    trading_mode: Optional[TradingMode]
+    exchange: Optional[str]
+
+
 class Ping(BaseModel):
     status: str
 
@@ -428,12 +433,10 @@ class PairListsResponse(BaseModel):
     pairlists: List[PairListResponse]
 
 
-class PairListsPayload(BaseModel):
+class PairListsPayload(ExchangeModePayloadMixin, BaseModel):
     pairlists: List[Dict[str, Any]]
     blacklist: List[str]
     stake_currency: str
-    trading_mode: Optional[TradingMode]
-    exchange: Optional[str]
 
 
 class FreqAIModelListResponse(BaseModel):