klend-interface 0.6.0

Instruction builders for Kamino Lending (klend) — no anchor-lang dependency
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

use solana_instruction::Instruction;
use solana_pubkey::Pubkey;

use super::{
    common::{
        build_deposit_reserves_remaining, build_refresh_all_obligation_reserves,
        build_refresh_obligation, build_refresh_reserve,
    },
    info::{FarmsAccounts, ObligationInfo, ReserveInfo},
};
use crate::{
    instructions::borrow::{
        borrow_obligation_liquidity_v2, rollover_fixed_term_borrow as rollover_ix,
        BorrowObligationLiquidityV2Accounts, RolloverFixedTermBorrowAccounts,
    },
    pda::{self, ReservePdas},
    KLEND_PROGRAM_ID,
};

/// Build instructions to borrow liquidity from a reserve against an obligation.
///
/// `obligation_reserves` should contain [`ReserveInfo`] for every deposit and
/// borrow reserve on the obligation. Any reserves not already refreshed by this
/// helper are refreshed automatically so that `refresh_obligation` succeeds.
///
/// Returns: `[refresh_other_reserves..., refresh_borrow_reserve, refresh_obligation, borrow_obligation_liquidity_v2]`
pub fn borrow(
    owner: Pubkey,
    borrow_reserve: &ReserveInfo,
    obligation: &ObligationInfo,
    obligation_reserves: &[ReserveInfo],
    user_destination_liquidity: Pubkey,
    liquidity_amount: u64,
    farms: Option<&FarmsAccounts>,
) -> Vec<Instruction> {
    let pdas = ReservePdas::derive(&KLEND_PROGRAM_ID, &borrow_reserve.address);
    let (lma, _) = pda::lending_market_authority(&KLEND_PROGRAM_ID, &borrow_reserve.lending_market);

    let referrer_token_state = obligation.referrer.map(|referrer| {
        pda::referrer_token_state(&KLEND_PROGRAM_ID, &referrer, &borrow_reserve.address).0
    });

    let remaining = build_deposit_reserves_remaining(obligation);

    let mut ixs = build_refresh_all_obligation_reserves(
        obligation,
        obligation_reserves,
        &[borrow_reserve.address],
    );
    ixs.push(build_refresh_reserve(borrow_reserve));
    ixs.push(build_refresh_obligation(
        &borrow_reserve.lending_market,
        obligation,
    ));
    ixs.push(borrow_obligation_liquidity_v2(
        BorrowObligationLiquidityV2Accounts {
            owner,
            obligation: obligation.address,
            lending_market: borrow_reserve.lending_market,
            lending_market_authority: lma,
            borrow_reserve: borrow_reserve.address,
            borrow_reserve_liquidity_mint: borrow_reserve.liquidity_mint,
            reserve_source_liquidity: pdas.liquidity_supply_vault,
            borrow_reserve_liquidity_fee_receiver: pdas.fee_vault,
            user_destination_liquidity,
            referrer_token_state,
            token_program: borrow_reserve.liquidity_token_program,
            obligation_farm_user_state: farms.map(|f| f.obligation_farm_user_state),
            reserve_farm_state: farms.map(|f| f.reserve_farm_state),
        },
        liquidity_amount,
        remaining,
    ));

    ixs
}

/// Build instructions to roll over a fixed-term borrow into a new reserve (or same reserve).
///
/// `obligation_reserves` should contain [`ReserveInfo`] for every deposit and
/// borrow reserve on the obligation. The source and target reserves will be
/// refreshed automatically.
///
/// Returns: `[refresh_other_reserves..., refresh_source, refresh_target (if different), refresh_obligation, rollover_fixed_term_borrow]`
pub fn rollover_fixed_term_borrow(
    payer: Pubkey,
    obligation: &ObligationInfo,
    obligation_reserves: &[ReserveInfo],
    source_reserve: &ReserveInfo,
    target_reserve: &ReserveInfo,
    source_farms: Option<&FarmsAccounts>,
    target_farms: Option<&FarmsAccounts>,
) -> Vec<Instruction> {
    let (lma, _) = pda::lending_market_authority(&KLEND_PROGRAM_ID, &source_reserve.lending_market);
    let source_pdas = ReservePdas::derive(&KLEND_PROGRAM_ID, &source_reserve.address);
    let target_pdas = ReservePdas::derive(&KLEND_PROGRAM_ID, &target_reserve.address);

    let mut already_refreshed = vec![source_reserve.address];
    let same_reserve = source_reserve.address == target_reserve.address;
    if !same_reserve {
        already_refreshed.push(target_reserve.address);
    }

    let mut ixs =
        build_refresh_all_obligation_reserves(obligation, obligation_reserves, &already_refreshed);
    ixs.push(build_refresh_reserve(source_reserve));
    if !same_reserve {
        ixs.push(build_refresh_reserve(target_reserve));
    }
    ixs.push(build_refresh_obligation(
        &source_reserve.lending_market,
        obligation,
    ));

    ixs.push(rollover_ix(RolloverFixedTermBorrowAccounts {
        payer,
        obligation: obligation.address,
        lending_market: source_reserve.lending_market,
        lending_market_authority: lma,
        source_borrow_reserve: source_reserve.address,
        target_borrow_reserve: target_reserve.address,
        liquidity_mint: source_reserve.liquidity_mint,
        source_borrow_reserve_liquidity: source_pdas.liquidity_supply_vault,
        target_borrow_reserve_liquidity: target_pdas.liquidity_supply_vault,
        token_program: source_reserve.liquidity_token_program,
        source_obligation_farm_user_state: source_farms.map(|f| f.obligation_farm_user_state),
        source_reserve_farm_state: source_farms.map(|f| f.reserve_farm_state),
        target_obligation_farm_user_state: target_farms.map(|f| f.obligation_farm_user_state),
        target_reserve_farm_state: target_farms.map(|f| f.reserve_farm_state),
    }));

    ixs
}