update liquidation close factor as part of param updates (#74)

* update liquidation close factor as part of param updates

* fix test

Author: nope-finance

token-lending/program/src/state/reserve.rs

@@ -18,7 +18,7 @@ use std::{
 };
 
 /// Percentage of an obligation that can be repaid during each liquidation call
-pub const LIQUIDATION_CLOSE_FACTOR: u8 = 50;
+pub const LIQUIDATION_CLOSE_FACTOR: u8 = 20;
 
 /// Obligation borrow amount that is small enough to close out
 pub const LIQUIDATION_CLOSE_AMOUNT: u64 = 2;

token-lending/program/tests/liquidate_obligation.rs

@@ -31,10 +31,11 @@ async fn test_success() {
     const SOL_DEPOSIT_AMOUNT_LAMPORTS: u64 = 100 * LAMPORTS_TO_SOL * INITIAL_COLLATERAL_RATIO;
     // 100 SOL * 80% LTV -> 80 SOL * 20 USDC -> 1600 USDC borrow
     const USDC_BORROW_AMOUNT_FRACTIONAL: u64 = 1_600 * FRACTIONAL_TO_USDC;
-    // 1600 USDC * 50% -> 800 USDC liquidation
-    const USDC_LIQUIDATION_AMOUNT_FRACTIONAL: u64 = USDC_BORROW_AMOUNT_FRACTIONAL / 2;
-    // 800 USDC / 20 USDC per SOL -> 40 SOL + 10% bonus -> 44 SOL
-    const SOL_LIQUIDATION_AMOUNT_LAMPORTS: u64 = 44 * LAMPORTS_TO_SOL * INITIAL_COLLATERAL_RATIO;
+    // 1600 USDC * 20% -> 320 USDC liquidation
+    const USDC_LIQUIDATION_AMOUNT_FRACTIONAL: u64 = USDC_BORROW_AMOUNT_FRACTIONAL / 5;
+    // 320 USDC / 20 USDC per SOL -> 16 SOL + 10% bonus -> 17.6 SOL (88/5)
+    const SOL_LIQUIDATION_AMOUNT_LAMPORTS: u64 =
+        LAMPORTS_TO_SOL * INITIAL_COLLATERAL_RATIO * 88 / 5;
 
     const SOL_RESERVE_COLLATERAL_LAMPORTS: u64 = 2 * SOL_DEPOSIT_AMOUNT_LAMPORTS;
     const USDC_RESERVE_LIQUIDITY_FRACTIONAL: u64 = 2 * USDC_BORROW_AMOUNT_FRACTIONAL;