add posted slot check and test

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Features
 
+- program: add posted slot tail to order struct, use it to determine vamm availability for high volume users ([#1459](https://github.com/drift-labs/protocol-v2/pull/1459))
+
 ### Fixes
 
 ### Breaking

deps/configs/pyth_lazer_storage.json

@@ -3,7 +3,7 @@
   "account": {
     "lamports": 1461600,
     "data": [
-      "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",
+      "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",
       "base64"
     ],
     "owner": "pytd2yyk641x7ak7mkaasSJVXh6YYZnC7wTmtgAyxPt",

programs/drift/src/controller/orders.rs

@@ -292,7 +292,8 @@ pub fn place_perp_order(
         auction_end_price,
         auction_duration,
         max_ts,
-        padding: [0; 3],
+        posted_slot_tail: get_posted_slot_from_clock_slot(slot),
+        padding: [0; 2],
     };
 
     let valid_oracle_price = Some(oracle_price_data.price);
@@ -1108,6 +1109,7 @@ pub fn fill_perp_order(
         order_oracle_price_offset,
         order_direction,
         order_auction_duration,
+        order_posted_slot_tail,
     ) = get_struct_values!(
         user.orders[order_index],
         status,
@@ -1116,7 +1118,8 @@ pub fn fill_perp_order(
         price,
         oracle_price_offset,
         direction,
-        auction_duration
+        auction_duration,
+        posted_slot_tail
     );
 
     validate!(
@@ -1389,9 +1392,17 @@ pub fn fill_perp_order(
         return Ok((0, 0));
     }
 
+    let clock_slot_tail = get_posted_slot_from_clock_slot(slot);
+
     let amm_availability = if amm_is_available {
         if amm_can_skip_duration && user_can_skip_duration {
             AMMAvailability::Immediate
+        } else if !user_can_skip_duration
+            && (clock_slot_tail.wrapping_sub(order_posted_slot_tail)
+                < state.min_perp_auction_duration)
+        {
+            msg!("Overriding toxic user from afterminduration to unavailble");
+            AMMAvailability::Unavailable
         } else {
             AMMAvailability::AfterMinDuration
         }
@@ -3694,7 +3705,8 @@ pub fn place_spot_order(
         auction_end_price,
         auction_duration,
         max_ts,
-        padding: [0; 3],
+        posted_slot_tail: get_posted_slot_from_clock_slot(slot),
+        padding: [0; 2],
     };
 
     validate_spot_order(

programs/drift/src/math/orders.rs

@@ -1379,3 +1379,7 @@ pub fn select_margin_type_for_perp_maker(
 
     Ok(MarginRequirementType::Fill)
 }
+
+pub fn get_posted_slot_from_clock_slot(slot: u64) -> u8 {
+    (slot & 0xFF) as u8
+}

programs/drift/src/math/orders/tests.rs

@@ -3891,3 +3891,27 @@ mod fallback_price_logic {
         assert_eq!(result, 99500000);
     }
 }
+
+mod posted_slot_tail {
+    use crate::math::orders::get_posted_slot_from_clock_slot;
+
+    #[test]
+    fn easy_test() {
+        let slot: u64 = 318454856;
+        let posted_slot_tail = get_posted_slot_from_clock_slot(slot);
+        assert_eq!(posted_slot_tail, (slot % 256) as u8);
+    }
+
+    #[test]
+    fn constant_diff() {
+        let starting_slot: u64 = 318454856;
+
+        for i in 0..1000 {
+            let slot = starting_slot + i;
+            let slot_minus_50 = slot - 50;
+            let posted_slot_tail = get_posted_slot_from_clock_slot(slot);
+            let posted_slot_tail_minus_50 = get_posted_slot_from_clock_slot(slot_minus_50);
+            assert_eq!(posted_slot_tail.wrapping_sub(posted_slot_tail_minus_50), 50);
+        }
+    }
+}

programs/drift/src/state/order_params/tests.rs

@@ -1035,6 +1035,7 @@ mod update_perp_auction_params {
 }
 
 mod get_close_perp_params {
+    use crate::math::orders::get_posted_slot_from_clock_slot;
     use crate::state::oracle::HistoricalOracleData;
     use crate::state::order_params::PostOnlyParam;
     use crate::state::perp_market::{PerpMarket, AMM};
@@ -1380,7 +1381,8 @@ mod get_close_perp_params {
             auction_end_price: params.auction_end_price.unwrap_or(0),
             auction_duration: params.auction_duration.unwrap_or(0),
             max_ts: 100,
-            padding: [0; 3],
+            posted_slot_tail: get_posted_slot_from_clock_slot(slot),
+            padding: [0; 2],
         }
     }
 

programs/drift/src/state/user.rs

@@ -1339,7 +1339,9 @@ pub struct Order {
     pub trigger_condition: OrderTriggerCondition,
     /// How many slots the auction lasts
     pub auction_duration: u8,
-    pub padding: [u8; 3],
+    /// Last 8 bits of the slot the order was posted on-chain (not order slot for swift orders)
+    pub posted_slot_tail: u8,
+    pub padding: [u8; 2],
 }
 
 #[derive(Clone, Copy, BorshSerialize, BorshDeserialize, PartialEq, Eq, Debug)]
@@ -1614,7 +1616,8 @@ impl Default for Order {
             auction_end_price: 0,
             auction_duration: 0,
             max_ts: 0,
-            padding: [0; 3],
+            posted_slot_tail: 0,
+            padding: [0; 2],
         }
     }
 }

sdk/src/decode/user.ts

@@ -237,7 +237,8 @@ export function decodeUser(buffer: Buffer): UserAccount {
 		offset += 1;
 		const auctionDuration = buffer.readUInt8(offset);
 		offset += 1;
-		offset += 3; // padding
+		const postedSlotTail = buffer.readUint8(offset);
+		offset += 2; // padding
 		orders.push({
 			slot,
 			price,
@@ -263,6 +264,7 @@ export function decodeUser(buffer: Buffer): UserAccount {
 			immediateOrCancel,
 			triggerCondition,
 			auctionDuration,
+			postedSlotTail,
 		});
 	}
 

sdk/src/idl/drift.json

@@ -10875,12 +10875,19 @@
             ],
             "type": "u8"
           },
+          {
+            "name": "postedSlotTail",
+            "docs": [
+              "Last 8 bits of the slot the order was posted on-chain (not order slot for swift orders)"
+            ],
+            "type": "u8"
+          },
           {
             "name": "padding",
             "type": {
               "array": [
                 "u8",
-                3
+                2
               ]
             }
           }

sdk/src/types.ts

@@ -1040,6 +1040,7 @@ export type Order = {
 	auctionStartPrice: BN;
 	auctionEndPrice: BN;
 	maxTs: BN;
+	postedSlotTail: number;
 };
 
 export type OrderParams = {

sdk/tests/user/helpers.ts

@@ -41,6 +41,7 @@ export const mockOrder: Order = {
 	auctionStartPrice: ZERO,
 	auctionEndPrice: ZERO,
 	maxTs: ZERO,
+	postedSlotTail: 0,
 };
 
 export const mockSpotPosition: SpotPosition = {