From bf7da35e31a3d9a98fff35cd098ecaf83f6d91f2 Mon Sep 17 00:00:00 2001
From: Sam Germain <sam.germain@usask.ca>
Date: Fri, 1 Apr 2022 09:25:03 -0600
Subject: [PATCH] strategy callback on_whitelist_update

---
 freqtrade/freqtradebot.py       | 4 ++++
 freqtrade/strategy/interface.py | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/freqtrade/freqtradebot.py b/freqtrade/freqtradebot.py
index bee6c4746..949d821b3 100644
--- a/freqtrade/freqtradebot.py
+++ b/freqtrade/freqtradebot.py
@@ -179,6 +179,7 @@ class FreqtradeBot(LoggingMixin):
         # Query trades from persistence layer
         trades = Trade.get_open_trades()
 
+        current_pair_whitelist = self.active_pair_whitelist
         self.active_pair_whitelist = self._refresh_active_whitelist(trades)
 
         # Refreshing candles
@@ -214,6 +215,9 @@ class FreqtradeBot(LoggingMixin):
         Trade.commit()
         self.last_process = datetime.now(timezone.utc)
 
+        if current_pair_whitelist != self.active_pair_whitelist:
+            self.strategy.on_whitelist_update()
+
     def process_stopped(self) -> None:
         """
         Close all orders that were left open
diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index 40744ed08..00d18fa7b 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -209,6 +209,13 @@ class IStrategy(ABC, HyperStrategyMixin):
         """
         pass
 
+    def on_whitelist_update(self, **kwargs) -> None:
+        """
+        Called every time the whitelist updates
+        :param **kwargs: Ensure to keep this here so updates to this won't break your strategy.
+        """
+        pass
+
     def check_buy_timeout(self, pair: str, trade: Trade, order: Order,
                           current_time: datetime, **kwargs) -> bool:
         """