Allow <1m timeframes for utility modes

freqtrade/exchange/exchange.py

@@ -23,7 +23,7 @@ from freqtrade.constants import (DEFAULT_AMOUNT_RESERVE_PERCENT, NON_OPEN_EXCHAN
                                  BuySell, Config, EntryExit, ExchangeConfig,
                                  ListPairsWithTimeframes, MakerTaker, OBLiteral, PairWithTimeframe)
 from freqtrade.data.converter import clean_ohlcv_dataframe, ohlcv_to_dataframe, trades_dict_to_list
-from freqtrade.enums import OPTIMIZE_MODES, CandleType, MarginMode, PriceType, TradingMode
+from freqtrade.enums import OPTIMIZE_MODES, CandleType, MarginMode, PriceType, RunMode, TradingMode
 from freqtrade.exceptions import (DDosProtection, ExchangeError, InsufficientFundsError,
                                   InvalidOrderException, OperationalException, PricingError,
                                   RetryableOrderError, TemporaryError)
@@ -595,7 +595,11 @@ class Exchange:
             raise OperationalException(
                 f"Invalid timeframe '{timeframe}'. This exchange supports: {self.timeframes}")
 
-        if timeframe and timeframe_to_minutes(timeframe) < 1:
+        if (
+            timeframe
+            and self._config['runmode'] != RunMode.UTIL_EXCHANGE
+            and timeframe_to_minutes(timeframe) < 1
+        ):
             raise OperationalException("Timeframes < 1m are currently not supported by Freqtrade.")
 
     def validate_ordertypes(self, order_types: Dict) -> None:

tests/exchange/test_exchange.py

@@ -9,7 +9,7 @@ import ccxt
 import pytest
 from pandas import DataFrame
 
-from freqtrade.enums import CandleType, MarginMode, TradingMode
+from freqtrade.enums import CandleType, MarginMode, RunMode, TradingMode
 from freqtrade.exceptions import (DDosProtection, DependencyException, ExchangeError,
                                   InsufficientFundsError, InvalidOrderException,
                                   OperationalException, PricingError, TemporaryError)
@@ -796,7 +796,9 @@ def test_validate_timeframes_failed(default_conf, mocker):
 
     mocker.patch(f'{EXMS}._init_ccxt', MagicMock(return_value=api_mock))
     mocker.patch(f'{EXMS}._load_markets', MagicMock(return_value={}))
-    mocker.patch(f'{EXMS}.validate_pairs', MagicMock())
+    mocker.patch(f'{EXMS}.validate_pairs')
+    mocker.patch(f'{EXMS}.validate_stakecurrency')
+    mocker.patch(f'{EXMS}.validate_pricing')
     with pytest.raises(OperationalException,
                        match=r"Invalid timeframe '3m'. This exchange supports.*"):
         Exchange(default_conf)
@@ -806,6 +808,10 @@ def test_validate_timeframes_failed(default_conf, mocker):
                        match=r"Timeframes < 1m are currently not supported by Freqtrade."):
         Exchange(default_conf)
 
+    # Will not raise an exception in util mode.
+    default_conf['runmode'] = RunMode.UTIL_EXCHANGE
+    Exchange(default_conf)
+
 
 def test_validate_timeframes_emulated_ohlcv_1(default_conf, mocker):
     default_conf["timeframe"] = "3m"