Max deposit and repay

token-lending/program/src/processor.rs

@@ -34,7 +34,7 @@
 };
 use solend_sdk::state::{LendingMarketMetadata, RateLimiter, RateLimiterConfig, ReserveType};
 use solend_sdk::{switchboard_v2_devnet, switchboard_v2_mainnet};
-use spl_token::state::Mint;
+use spl_token::state::{Account, Mint};
 use std::{cmp::min, result::Result};
 use switchboard_program::{
     get_aggregator, get_aggregator_result, AggregatorState, RoundResult, SwitchboardAccountType,
@@ -660,6 +660,19 @@
         return Err(LendingError::InvalidMarketAuthority.into());
     }
 
+    let liquidity_amount = if liquidity_amount == u64::MAX {
+        let user_token_balance = Account::unpack(&source_liquidity_info.data.borrow())
+            .map_err(|_| {
+                msg!("Failed to deserialize user token account");
+                LendingError::InvalidAccountInput
+            })?
+            .amount;
+
+        min(liquidity_amount, user_token_balance)
+    } else {
+        liquidity_amount
+    };
+
     if Decimal::from(liquidity_amount)
         .try_add(reserve.liquidity.total_supply()?)?
         .try_floor_u64()?
@@ -1192,6 +1205,19 @@
         return Err(LendingError::InvalidSigner.into());
     }
 
+    let collateral_amount = if collateral_amount == u64::MAX {
+        let user_token_balance = Account::unpack(&source_collateral_info.data.borrow())
+            .map_err(|_| {
+                msg!("Failed to deserialize user token account");
+                LendingError::InvalidAccountInput
+            })?
+            .amount;
+
+        min(collateral_amount, user_token_balance)
+    } else {
+        collateral_amount
+    };
+
     obligation
         .find_or_add_collateral_to_deposits(*deposit_reserve_info.key)?
         .deposit(collateral_amount)?;
@@ -1806,6 +1832,19 @@
     // refreshing specific borrow instead of checking obligation stale
     liquidity.accrue_interest(repay_reserve.liquidity.cumulative_borrow_rate_wads)?;
 
+    let liquidity_amount = if liquidity_amount == u64::MAX {
+        let user_token_balance = Account::unpack(&source_liquidity_info.data.borrow())
+            .map_err(|_| {
+                msg!("Failed to deserialize user token account");
+                LendingError::InvalidAccountInput
+            })?
+            .amount;
+
+        min(liquidity_amount, user_token_balance)
+    } else {
+        liquidity_amount
+    };
+
     let CalculateRepayResult {
         settle_amount,
         repay_amount,

token-lending/program/tests/deposit_obligation_collateral.rs

@@ -117,3 +117,34 @@ async fn test_fail_deposit_too_much() {
         e => panic!("unexpected error: {:#?}", e),
     };
 }
+
+#[tokio::test]
+async fn test_success_deposit_max() {
+    let (mut test, lending_market, usdc_reserve, user, obligation) = setup().await;
+
+    let balance_checker = BalanceChecker::start(&mut test, &[&usdc_reserve, &user]).await;
+
+    lending_market
+        .deposit_obligation_collateral(&mut test, &usdc_reserve, &obligation, &user, u64::MAX)
+        .await
+        .unwrap();
+
+    let (balance_changes, _) = balance_checker.find_balance_changes(&mut test).await;
+
+    let expected_balance_changes = HashSet::from([
+        TokenBalanceChange {
+            token_account: user
+                .get_account(&usdc_reserve.account.collateral.mint_pubkey)
+                .unwrap(),
+            mint: usdc_reserve.account.collateral.mint_pubkey,
+            diff: -1_000_000,
+        },
+        TokenBalanceChange {
+            token_account: usdc_reserve.account.collateral.supply_pubkey,
+            mint: usdc_reserve.account.collateral.mint_pubkey,
+            diff: 1_000_000,
+        },
+    ]);
+
+    assert_eq!(balance_changes, expected_balance_changes);
+}

token-lending/program/tests/deposit_reserve_liquidity.rs

@@ -163,3 +163,50 @@ async fn test_fail_deposit_too_much() {
         e => panic!("unexpected error: {:#?}", e),
     };
 }
+
+#[tokio::test]
+async fn test_success_deposit_max() {
+    let (mut test, lending_market, usdc_reserve, _) = setup().await;
+
+    let user = User::new_with_balances(
+        &mut test,
+        &[
+            (&usdc_mint::id(), 50_000 * FRACTIONAL_TO_USDC),
+            (&usdc_reserve.account.collateral.mint_pubkey, 0),
+        ],
+    )
+    .await;
+
+    let balance_checker = BalanceChecker::start(&mut test, &[&usdc_reserve, &user]).await;
+
+    lending_market
+        .deposit(&mut test, &usdc_reserve, &user, u64::MAX)
+        .await
+        .unwrap();
+
+    let (balance_changes, _) = balance_checker.find_balance_changes(&mut test).await;
+
+    let expected_balance_changes = HashSet::from([
+        TokenBalanceChange {
+            token_account: user
+                .get_account(&usdc_reserve.account.liquidity.mint_pubkey)
+                .unwrap(),
+            mint: usdc_reserve.account.liquidity.mint_pubkey,
+            diff: -(50_000 * FRACTIONAL_TO_USDC as i128),
+        },
+        TokenBalanceChange {
+            token_account: user
+                .get_account(&usdc_reserve.account.collateral.mint_pubkey)
+                .unwrap(),
+            mint: usdc_reserve.account.collateral.mint_pubkey,
+            diff: 50_000 * FRACTIONAL_TO_USDC as i128,
+        },
+        TokenBalanceChange {
+            token_account: usdc_reserve.account.liquidity.supply_pubkey,
+            mint: usdc_reserve.account.liquidity.mint_pubkey,
+            diff: 50_000 * FRACTIONAL_TO_USDC as i128,
+        },
+    ]);
+
+    assert_eq!(balance_changes, expected_balance_changes);
+}

token-lending/program/tests/repay_obligation_liquidity.rs

@@ -2,7 +2,14 @@
 
 mod helpers;
 
+use crate::solend_program_test::custom_scenario;
 use crate::solend_program_test::scenario_1;
+use crate::solend_program_test::ObligationArgs;
+use crate::solend_program_test::PriceArgs;
+use crate::solend_program_test::ReserveArgs;
+use crate::solend_program_test::User;
+use solend_sdk::state::ReserveConfig;
+use solend_sdk::state::ReserveFees;
 use std::collections::HashSet;
 
 use helpers::solend_program_test::{BalanceChecker, TokenBalanceChange};
@@ -110,3 +117,78 @@ async fn test_success() {
         }
     );
 }
+
+#[tokio::test]
+async fn test_repay_max() {
+    let (mut test, lending_market, reserves, obligations, _users, _) = custom_scenario(
+        &[
+            ReserveArgs {
+                mint: usdc_mint::id(),
+                config: test_reserve_config(),
+                liquidity_amount: 100_000 * FRACTIONAL_TO_USDC,
+                price: PriceArgs {
+                    price: 10,
+                    conf: 0,
+                    expo: -1,
+                    ema_price: 10,
+                    ema_conf: 1,
+                },
+            },
+            ReserveArgs {
+                mint: wsol_mint::id(),
+                config: ReserveConfig {
+                    loan_to_value_ratio: 50,
+                    liquidation_threshold: 55,
+                    fees: ReserveFees::default(),
+                    optimal_borrow_rate: 0,
+                    max_borrow_rate: 0,
+                    ..test_reserve_config()
+                },
+                liquidity_amount: 100 * LAMPORTS_PER_SOL,
+                price: PriceArgs {
+                    price: 10,
+                    conf: 0,
+                    expo: 0,
+                    ema_price: 10,
+                    ema_conf: 0,
+                },
+            },
+        ],
+        &[ObligationArgs {
+            deposits: vec![(usdc_mint::id(), 100 * FRACTIONAL_TO_USDC)],
+            borrows: vec![(wsol_mint::id(), LAMPORTS_PER_SOL)],
+        }],
+    )
+    .await;
+
+    let repayooor =
+        User::new_with_balances(&mut test, &[(&wsol_mint::id(), LAMPORTS_PER_SOL / 10)]).await;
+
+    let balance_checker = BalanceChecker::start(&mut test, &[&repayooor, &reserves[1]]).await;
+
+    lending_market
+        .repay_obligation_liquidity(
+            &mut test,
+            &reserves[1],
+            &obligations[0],
+            &repayooor,
+            u64::MAX,
+        )
+        .await
+        .unwrap();
+
+    let (balance_changes, _) = balance_checker.find_balance_changes(&mut test).await;
+    let expected_balance_changes = HashSet::from([
+        TokenBalanceChange {
+            token_account: repayooor.get_account(&wsol_mint::id()).unwrap(),
+            mint: wsol_mint::id(),
+            diff: -((LAMPORTS_PER_SOL / 10) as i128),
+        },
+        TokenBalanceChange {
+            token_account: reserves[1].account.liquidity.supply_pubkey,
+            mint: wsol_mint::id(),
+            diff: (LAMPORTS_PER_SOL / 10) as i128,
+        },
+    ]);
+    assert_eq!(balance_changes, expected_balance_changes);
+}