Create strategy_wrapper to call user-defined code with

freqtrade/strategy/strategy_wrapper.py

@@ -0,0 +1,29 @@
+import logging
+
+from freqtrade.exceptions import StrategyError
+
+logger = logging.getLogger(__name__)
+
+
+def strategy_safe_wrapper(f, message: str, default_retval=None):
+    def wrapper(*args, **kwargs):
+        try:
+            return f(*args, **kwargs)
+        except ValueError as error:
+            logger.warning(
+                f"{message}"
+                f"Strategy caused the following exception: {error}"
+                f"{f}"
+            )
+            if not default_retval:
+                raise StrategyError(str(error)) from error
+            return default_retval
+        except Exception as error:
+            logger.exception(
+                f"Unexpected error {error} calling {f}"
+            )
+            if not default_retval:
+                raise StrategyError(str(error)) from error
+            return default_retval
+
+    return wrapper