program: check if user has room for open order before placing order t… (

#899)

* program: check if user has room for open order before placing order to derisk lp position

* add CHANGELOG.md

---------

Co-authored-by: 0xbigz <[email protected]>

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixes
 
+- program: handle derisk lp when orders array full ([#899](https://github.com/drift-labs/protocol-v2/pull/899))
 - program: invalid borrow in get_referrer_info when maker is refferer ([#900](https://github.com/drift-labs/protocol-v2/pull/900))
 
 ### Breaking

programs/drift/src/controller/orders.rs

@@ -2960,17 +2960,19 @@ pub fn burn_user_lp_shares_for_risk_reduction(
 
     drop(market);
 
-    controller::orders::place_perp_order(
-        state,
-        user,
-        user_key,
-        perp_market_map,
-        spot_market_map,
-        oracle_map,
-        clock,
-        params,
-        PlaceOrderOptions::default().explanation(OrderActionExplanation::DeriskLp),
-    )?;
+    if user.has_room_for_new_order() {
+        controller::orders::place_perp_order(
+            state,
+            user,
+            user_key,
+            perp_market_map,
+            spot_market_map,
+            oracle_map,
+            clock,
+            params,
+            PlaceOrderOptions::default().explanation(OrderActionExplanation::DeriskLp),
+        )?;
+    }
 
     Ok(())
 }

programs/drift/src/state/user.rs

@@ -410,6 +410,16 @@ impl User {
 
         Ok(())
     }
+
+    pub fn has_room_for_new_order(&self) -> bool {
+        for order in self.orders.iter() {
+            if order.status == OrderStatus::Init {
+                return true;
+            }
+        }
+
+        false
+    }
 }
 
 #[zero_copy(unsafe)]