Implement adjusting positions and begin writing live tests for AMS

core/trading/active_management.py

@@ -95,7 +95,23 @@ class ActiveManagement(object):
         sendmsg(self.strategy.user, msg, title=f"AMS: {action}")
 
     def adjust_position_size(self, trade_id, new_size):
-        pass  # TODO
+        # Get old size
+        old_size = None
+        for trade in self.trades:
+            if trade["id"] == trade_id:
+                old_size = D(trade["currentUnits"])
+                symbol = trade["symbol"]
+                break
+        if old_size is None:
+            log.error(f"Could not find trade ID {trade_id} in active management")
+            return
+
+        # Reduce only
+        assert old_size > new_size
+        difference = old_size - new_size
+
+        # Close the difference
+        self.strategy.account.client.close_trade(trade_id, difference, symbol)
 
     def adjust_protection(self, trade_id, new_protection):
         pass  # TODO