program: check limit price when setting auction for limit order (#1650)

* program: check limit price after applying buffer in trigger limit order auction

* program: reduce duplicate code

* program: check limit price when setting limit auction params

Author: crispheaney

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - sdk: fix to getMaxTradeSizeUSDCForPerp which was previously overshooting max allowed size due to IMF factor
 - program: add existing position fields to order records ([#1614](https://github.com/drift-labs/protocol-v2/pull/1614))
 - program: check limit price after applying buffer in trigger limit order ([#1648](https://github.com/drift-labs/protocol-v2/pull/1648))
+- program: check limit price when setting auction for limit order ([#1650](https://github.com/drift-labs/protocol-v2/pull/1650))
 
 ### Breaking
 

programs/drift/src/state/order_params.rs

@@ -200,7 +200,7 @@ impl OrderParams {
                         if is_oracle_offset_oracle {
                             msg!(
                                 "Updating oracle limit auction start price to {}",
-                                new_auction_start_price
+                                auction_start_price_offset
                             );
                             self.auction_start_price = Some(auction_start_price_offset);
                         } else {
@@ -216,7 +216,7 @@ impl OrderParams {
                     if is_oracle_offset_oracle {
                         msg!(
                             "Updating oracle limit auction start price to {}",
-                            new_auction_start_price
+                            auction_start_price_offset
                         );
                         self.auction_start_price = Some(auction_start_price_offset);
                     } else {
@@ -243,6 +243,28 @@ impl OrderParams {
             }
         }
 
+        let worst_price = if is_oracle_offset_oracle {
+            oracle_price_offset as i64
+        } else {
+            self.price as i64
+        };
+
+        if self.direction == PositionDirection::Long {
+            if let Some(auction_start_price) = self.auction_start_price {
+                self.auction_start_price = Some(auction_start_price.min(worst_price));
+            }
+            if let Some(auction_end_price) = self.auction_end_price {
+                self.auction_end_price = Some(auction_end_price.min(worst_price));
+            }
+        } else {
+            if let Some(auction_start_price) = self.auction_start_price {
+                self.auction_start_price = Some(auction_start_price.max(worst_price));
+            }
+            if let Some(auction_end_price) = self.auction_end_price {
+                self.auction_end_price = Some(auction_end_price.max(worst_price));
+            }
+        }
+
         let auction_duration_before = self.auction_duration;
         let new_auction_duration = get_auction_duration(
             self.auction_end_price