program: longer auction duration for safe contract tiers

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Features
 
+- program: longer derived auction durations for contract tier B and safer ([#889](https://github.com/drift-labs/protocol-v2/pull/889)) 
 - program: always try update market order auction durations ([#882](https://github.com/drift-labs/protocol-v2/pull/882))
 - program: amm drawdown check ([#865](https://github.com/drift-labs/protocol-v2/pull/865))
 - program: relax oracle guardrail validity check for init margin calc for positive pnl ([#876](https://github.com/drift-labs/protocol-v2/pull/876))

programs/drift/src/state/order_params.rs

@@ -130,6 +130,7 @@ impl OrderParams {
                 .safe_sub(self.auction_start_price.safe_unwrap()?)?
                 .unsigned_abs(),
             oracle_price.unsigned_abs(),
+            perp_market.contract_tier,
         )?;
         self.auction_duration = Some(
             auction_duration_before
@@ -255,6 +256,7 @@ impl OrderParams {
                 .safe_sub(self.auction_start_price.safe_unwrap()?)?
                 .unsigned_abs(),
             oracle_price.unsigned_abs(),
+            perp_market.contract_tier,
         )?;
         self.auction_duration = Some(
             auction_duration_before
@@ -305,6 +307,7 @@ impl OrderParams {
                 .safe_sub(auction_start_price)?
                 .unsigned_abs(),
             oracle_price.unsigned_abs(),
+            perp_market.contract_tier,
         )?;
 
         Ok((auction_start_price, auction_end_price, auction_duration))
@@ -341,6 +344,7 @@ impl OrderParams {
                 .safe_sub(auction_start_price)?
                 .unsigned_abs(),
             oracle_price.unsigned_abs(),
+            perp_market.contract_tier,
         )?;
 
         Ok((auction_start_price, auction_end_price, auction_duration))
@@ -517,11 +521,21 @@ impl OrderParams {
     }
 }
 
-fn get_auction_duration(price_diff: u64, price: u64) -> DriftResult<u8> {
+fn get_auction_duration(
+    price_diff: u64,
+    price: u64,
+    contract_tier: ContractTier,
+) -> DriftResult<u8> {
     let percent_diff = price_diff.safe_mul(PERCENTAGE_PRECISION_U64)?.div(price);
 
+    let slots_per_bp = if contract_tier.is_as_safe_as_contract(&ContractTier::B) {
+        100
+    } else {
+        60
+    };
+
     Ok(percent_diff
-        .safe_mul(60)?
+        .safe_mul(slots_per_bp)?
         .safe_div_ceil(PERCENTAGE_PRECISION_U64 / 100)? // 1% = 60 slots
         .clamp(10, 180) as u8) // 180 slots max
 }

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

@@ -1,37 +1,38 @@
 mod get_auction_duration {
     use crate::state::order_params::get_auction_duration;
-    use crate::PRICE_PRECISION_U64;
+    use crate::{ContractTier, PRICE_PRECISION_U64};
 
     #[test]
     fn test() {
         let price_diff = 0;
         let price = 100 * PRICE_PRECISION_U64;
+        let contract_tier = ContractTier::C;
 
-        let duration = get_auction_duration(price_diff, price).unwrap();
+        let duration = get_auction_duration(price_diff, price, contract_tier).unwrap();
         assert_eq!(duration, 10);
 
         let price_diff = PRICE_PRECISION_U64 / 10;
         let price = 100 * PRICE_PRECISION_U64;
 
-        let duration = get_auction_duration(price_diff, price).unwrap();
+        let duration = get_auction_duration(price_diff, price, contract_tier).unwrap();
         assert_eq!(duration, 10);
 
         let price_diff = PRICE_PRECISION_U64 / 2;
         let price = 100 * PRICE_PRECISION_U64;
 
-        let duration = get_auction_duration(price_diff, price).unwrap();
+        let duration = get_auction_duration(price_diff, price, contract_tier).unwrap();
         assert_eq!(duration, 30);
 
         let price_diff = PRICE_PRECISION_U64;
         let price = 100 * PRICE_PRECISION_U64;
 
-        let duration = get_auction_duration(price_diff, price).unwrap();
+        let duration = get_auction_duration(price_diff, price, contract_tier).unwrap();
         assert_eq!(duration, 60);
 
         let price_diff = 2 * PRICE_PRECISION_U64;
         let price = 100 * PRICE_PRECISION_U64;
 
-        let duration = get_auction_duration(price_diff, price).unwrap();
+        let duration = get_auction_duration(price_diff, price, contract_tier).unwrap();
         assert_eq!(duration, 120);
     }
 }
@@ -298,7 +299,7 @@ mod update_perp_auction_params {
         );
         assert_eq!(order_params_before.direction, order_params_after.direction);
 
-        assert_eq!(order_params_after.auction_duration, Some(61));
+        assert_eq!(order_params_after.auction_duration, Some(102));
     }
 
     #[test]