From f55db8e262f2f64758682a9a5b96abbab6051d0b Mon Sep 17 00:00:00 2001
From: Matthias <xmatthias@outlook.com>
Date: Thu, 17 Mar 2022 20:21:10 +0100
Subject: [PATCH] Spreadfilter should fail to start if fetchTickers is not
 supported

---
 freqtrade/plugins/pairlist/SpreadFilter.py |  7 +++++++
 tests/plugins/test_pairlist.py             | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/freqtrade/plugins/pairlist/SpreadFilter.py b/freqtrade/plugins/pairlist/SpreadFilter.py
index ad0c0f0be..d1f88d2a5 100644
--- a/freqtrade/plugins/pairlist/SpreadFilter.py
+++ b/freqtrade/plugins/pairlist/SpreadFilter.py
@@ -4,6 +4,7 @@ Spread pair list filter
 import logging
 from typing import Any, Dict
 
+from freqtrade.exceptions import OperationalException
 from freqtrade.plugins.pairlist.IPairList import IPairList
 
 
@@ -20,6 +21,12 @@ class SpreadFilter(IPairList):
         self._max_spread_ratio = pairlistconfig.get('max_spread_ratio', 0.005)
         self._enabled = self._max_spread_ratio != 0
 
+        if not self._exchange.exchange_has('fetchTickers'):
+            raise OperationalException(
+                'Exchange does not support fetchTickers, therefore SpreadFilter cannot be used.'
+                'Please edit your config and restart the bot.'
+            )
+
     @property
     def needstickers(self) -> bool:
         """
diff --git a/tests/plugins/test_pairlist.py b/tests/plugins/test_pairlist.py
index 52158a889..346bf1792 100644
--- a/tests/plugins/test_pairlist.py
+++ b/tests/plugins/test_pairlist.py
@@ -782,6 +782,18 @@ def test_gen_pair_whitelist_not_supported(mocker, default_conf, tickers) -> None
         get_patched_freqtradebot(mocker, default_conf)
 
 
+def test_pair_whitelist_not_supported_Spread(mocker, default_conf, tickers) -> None:
+    default_conf['pairlists'] = [{'method': 'StaticPairList'}, {'method': 'SpreadFilter'}]
+
+    mocker.patch.multiple('freqtrade.exchange.Exchange',
+                          get_tickers=tickers,
+                          exchange_has=MagicMock(return_value=False),
+                          )
+
+    with pytest.raises(OperationalException,
+                       match=r'Exchange does not support fetchTickers, .*'):
+        get_patched_freqtradebot(mocker, default_conf)
+
 @pytest.mark.parametrize("pairlist", AVAILABLE_PAIRLISTS)
 def test_pairlist_class(mocker, whitelist_conf, markets, pairlist):
     whitelist_conf['pairlists'][0]['method'] = pairlist