Interacting with Port Finance via Rust

We have two crates for interacting with Port Finance program via Rust:

Token-lending program

A lending protocol for the Token program on the Solana blockchain inspired by Aave and Compound.

Public Keys for Port Finance

Mainnet

Lending Market: 6T4XxKerq744sSuj3jaoV6QiZ8acirf4TrPwQzHAoSy5 Lending program id: port_variable_rate_lending_instructions::id() Staking program id: port_staking_instructions::id()

Reserve Public Keys

Asset Name

Reserve Address

SOL

X9ByyhmtQH3Wjku9N5obPy54DbVjZV7Z99TPJZ2rwcs

USDC

DcENuKuYd6BWGhKfGr7eARxodqG12Bz1sN5WA8NwvLRx

USDT

4tqY9Hv7e8YhNQXuH75WKrZ7tTckbv2GfFVxmVcScW5s

PAI

DSw99gXoGzvc4N7cNGU7TJ9bCWFq96NU2Cczi1TabDx2

SRM

ZgS3sv1tJAor2rbGMFLeJwxsEGDiHkcrR2ZaNHZUpyF

BTC

DSST29PMCVkxo8cf5ht9LxrPoMc8jAZt98t6nuJywz8p

MER

BnhsmYVvNjXK3TGDHLj1Yr1jBGCmD1gZMkAyCwoXsHwt

mSOL

9gDF5W94RowoDugxT8cM29cX8pKKQitTp2uYVrarBSQ7

pSOL

GRJyCEezbZQibAEfBKCRAg5YoTPP2UcRSTC7RfzoMypy

SBR

7dXHPrJtwBjQqU1pLKfkHbq9TjQAK9jTms3rnj1i3G77

You can get all the information below by parsing the reserve data. We provide the account data here for your convenience.

pToken Mint

Asset Name

pToken Mint

SOL

8ezDtNNhX91t1NbSLe8xV2PcCEfoQjEm2qDVGjt3rjhg

USDC

FgSsGV8GByPaMERxeQJPvZRZHf7zCBhrdYtztKorJS58

USDT

3RudPTAkfcq9Q9Jk8SVeCoecCBmdKMj6q5smsWzxqtqZ

PAI

GaqxUwFGGrDouYLqghchmZU97Y1rNhyF7noMTJNvpQPa

SRM

77TBgKmTNtMdGrt1ewNRb56F2Xw6fNLZZj33JZ3oGwXh

BTC

QN2HkkBaWHfYSU5bybyups9z1UHu8Eu7QeeyMbjD2JA

MER

6UgGnLA3Lfe8NBLAESctsUXWdP3zjMFzSLEZxS3tiaKh

mSOL

Dt1Cuau5m5CSmun8hZstjEh9RszxAmejnq7ZaHNcuXfA

SBR

FhraFicS7fGxHn8jfzuZ6TeTpCu8PAnQNZiT2tqM5xvv

Oracle Public Keys

Asset Name

Oracle Pubkey

SOL

H6ARHf6YXhGYeQfUzQNGk6rDNnLBQKrenN712K4AQJEG

USDC

N / A

USDT

3vxLXJqLqF3JG5TCbYycbKWRBbCJQLxQmBGCkyqEEefL

PAI

N/A

SRM

3NBReDRTLKMQEKiLD5tGcx4kXbTf88b7f2xLS9UuGjym

BTC

GVXRSBjFk6e6J3NbVPXohDJetcTjaeeuykUpbQF8UoMU

MER

G4AQpTYKH1Fmg38VpFQbv6uKYQMpRhJzNPALhp7hqdrs

pSOL

H6ARHf6YXhGYeQfUzQNGk6rDNnLBQKrenN712K4AQJEG

SBR

8Td9VML1nHxQK6M8VVyzsHo32D7VBk72jSpa9U861z2A

Supply Public Keys

Asset Name

Supply Public Keys

SOL

BLAFX12cDmsumyB6k3L6whJZqNqySaWeCmS5rVuzy3SS

USDC

2xPnqU4bWhUSjZ74CibY63NrtkHHw5eKntsxf8dzwiid

USDT

QyvfrbqH7Mo8W5tHN31nzbfNiwFwqPqahjm9fnzo5EJ

PAI

42kNZrAuwZHLtuc7jvVX7zMfkfgwbPynqzFB3zdkAEGM

SRM

DjhMNdgdbxNud1gmc4DUwrQqJxNbjhxiwNnhc4usSXmQ

BTC

FZKP27Zxz9GbW86hhq3d1egzpBH5ZnYkyjQZVf86NQJ8

MER

6UmrawFZgdPvMe6BLZdZCNRFz9u2TWsu5enFbTufA3a1

SBR

HTwd3VaDQphZgh2x7wqE2Qdndo4TT5C8fpvhKFcNh1Rt

Dev Net

Lending Program id: pdQ2rQQU5zH2rDgZ7xH2azMBJegUzUyunJ5Jd637hC4

Staking program id: port_staking_instructions::id()

Lending Market: H27Quk3DSbu55T4dCr1NddTTSAezXwHU67FPCZVKLhSW

Reserve Public Keys

Asset Name

Reserve Address

SOL

6FeVStQAGPWvfWijDHF7cTWRCi7He6vTT3ubfNhe9SPt

USDC

G1CcAWGhfxhHQaivC1Sh5CWVta6P4dc7a5BDSg9ERjV1

USDT

B4dnCXcWXSXy1g3fGAmF6P2XgsLTFYaQxYpsU3VCB33Q

BTC

A8krqNC1WpWYhqUe2Y5WbLd1Zy4y2rRN5wJC8o9Scbyk

MER

FdPnmYS7Ma8jfSy7UHAN5QM6teoqwd3vLQtoU6r2Umwy

You can get all the information below by parsing the reserve data. We provide the account data here for your convenience.

Fake token Mint

Asset Name

pToken Mint

SOL

So11111111111111111111111111111111111111112

USDC

G6YKv19AeGZ6pUYUwY9D7n4Ry9ESNFa376YqwEkUkhbi

USDT

9NGDi2tZtNmCCp8SVLKNuGjuWAVwNF3Vap5tT8km5er9

BTC

EbwEYuUQHxcSHszxPBhA2nT2JxhiNwJedwjsctJnLmsC

MER

Tm9LcR74uJHPw3zY3j3nSh5xfcyaLbvXgAtTJwbqnnp

pToken Mint

Asset Name

pToken Mint

SOL

Hk4Rp3kaPssB6hnjah3Mrqpt5CAXWGoqFT5dVsWA3TaM

USDC

HyxraiKfdajDbYTC6MVRToEUBdevBN5M5gfyR4LC3WSF

USDT

4xEXmSfLFPkZaxdL98XkoxKpXEvchPVs21GYqa8DvbAm

BTC

95XGx3cM83Z1Bbx8pJurAHwxJjvShTJE4BtfgMWfV6NB

MER

FQzruvtLTk6qtPNEAJHQWMVs4M9UMP9T3cGAVfUskHfP

Oracle Public Keys

Asset Name

Oracle Pubkey

SOL

J83w4HKfqxwcq3BEMMkPFSppX3gqekLyLJBexebFVkix

USDC

N/A

USDT

38xoQ4oeJCBrcVvca2cGk7iV1dAfrmTR1kmhSCJQ8Jto

BTC

HovQMDrbAgAYPCmHVSrezcSmkMtXSSUsLDFANExrZh2J

MER

6Z3ejn8DCWQFBuAcw29d3A5jgahEpmycn7YDMX7yRNrn

Supply Public Keys

Asset Name

Supply Public Keys

SOL

AbKeR7nQdHPDddiDQ71YUsz1F138a7cJMfJVtpdYUSvE

USDC

GAPyFes3o7S7coY9nsuhaRZBEA7DdQPHBfVdY2DdgNua

USDT

AeGbAqYZUURTykyCsgAUfopBMqQ3eAwrDxYhXoRhiw8q

BTC

75iyCxiPoj3MaUVo3SynmhaN3cbLDEhd4d9VHik6Kkvr

MER

AMjhzse1TtTcKBFw5tQPLGtVoEsL4gt9YowNnzMKEGUr

Create StakeAccount

For assets that have liquidity mining reward, you need to first create a stake account in order to collateralize and get the reward.

First, get the data of the reserve you want deposit into and unpack it to get the field reserve.config.deposit_staking_pool which is the staking pool id, and generates the seed and keypair by using the Solana built in sha256 hashing function solana_sdk::hash::hashv(&[owner.as_ref(), staking_pool.as_ref(), staking_program_id.as_ref()]), where the owner should be your wallet's public key, and generate the keypair for stake account by solana_sdk::signer::keypair::keypair_from_seed.

Then call create_account and create_stake_account instruction to create the stake account. Owner need to sign the instruction of claiming reward. If you are using a program to create the stake account, you can use an PDA account. Actually, you can use any address to create the stake account, as long as you make sure that there is a one-one mapping between (owner, staking_pool) and stake_account, which means that for every owner and staking_pool, you only have one stake account.

let account_seed = hashv( & [owner.as_ref(), staking_pool.as_ref(), staking_program_id.as_ref()]);
let stake_account_key_pair = keypair_from_seed(account_seed.as_ref()).unwrap();
let instructions = vec![
    create_account(
        &payer.pubkey(),
        &stake_account_key_pair.pubkey(),
        stake_account_rent,
        StakeAccount::LEN as u64,
        &staking_program_id
    ),
    create_stake_account(
        staking_program_id,
        stake_account_key_pair.pubkey(),
        staking_pool,
        owner
    )
];

Refresh Reserves and Obligation

Assuming that you already have your stake account or you are depositing to a reserve without liquidity mining reward, you need to refresh all the reserves the obligation has interacted with and the obligation itself in the same instruction before you depositing / withdrawing / repaying / liquidating.

let mut refresh_instructions = vec![];
//reserve_map is a map of reserve pubkey of reserve data, you can get the oracle pubkey from the reserve data or can hard code it in a config file.
let to_refresh = reserve_map.iter().filter( | (k, _) | {
        obligation
        .borrows
        .iter()
        .map(| li | li.borrow_reserve)
        .chain(obligation.deposits.iter().map(| ob | ob.deposit_reserve))
        .any( | r | r == * * k)
    });
refresh_instructions.extend(
    to_refresh.map( | (k, v) | refresh_reserve(lending_program_id, * k, v.liquidity.oracle_pubkey)),
);
refresh_instructions.push(
    refresh_obligation(
        program_id,
        obligation_pubkey,
        obligation
        .deposits
        .iter()
        .map(|d| d.deposit_reserve)
        .chain(obligation.borrows.iter().map(|b| b.borrow_reserve))
        .collect(),
    )
);

Initialize Obligation

let mut transaction = Transaction::new_with_payer(
    &[
        create_account(
            &payer.pubkey(),
            &obligation_keypair.pubkey(),
            rent.minimum_balance(Obligation::LEN),
            Obligation::LEN as u64,
            &port_finance_variable_rate_lending::id(),
        ),
        init_obligation(
            port_finance_variable_rate_lending::id(),
            obligation.pubkey,
            lending_market.pubkey,
            user_accounts_owner.pubkey(),
        ),
    ],
    Some( & payer.pubkey()),
);

Deposit Liquidity / Collateralize

deposit_reserve_liquidity(
    port_variable_rate_lending::id(),
    liquidity_amount,
    user_liquidity_token_account_pubkey,
    user_collateral_token_account_pubkey,
    reserve_pubkey,
    reserve.liquidity.supply_pubkey,
    reserve.collateral.mint_pubkey,
    self.pubkey,
    user_transfer_authority.pubkey()
)

deposit_obligation_collateral(
    port_variable_rate_lending::id(),
    liquidity_amount,
    user_collateral_token_account_pubkey,
    reserve.collateral.supply_pubkey,
    reserve_pubkey,
    obligation_pubkey,
    lending_market.pubkey,
    obligation.owner,
    user_transfer_authority.pubkey(),
    Some(stake_account_pubkey),
    Some(staking_pool_pubkey),
)

deposit_reserve_liquidity_and_obligation_collateral(
    port_variable_rate_lending::id(),
    liquidity_amount,
    user_liquidity_token_account_pubkey,
    user_collateral_token_account_pubkey,
    reserve_pubkey,
    reserve.liquidity.supply_pubkey,
    reserve.collateral.mint_pubkey,
    lending_market_pubkey,
    reserve.collateral.supply_pubkey,
    obligation_pubkey,
    obligation.owner,
    user_transfer_authority.pubkey(),
    Some(stake_account_pubkey),
    Some(staking_pool_pubkey),
)

Withdraw

There will be a coming withdrawAndRedeem instruction soon, while it is under auditing. So now, you need first uncollateralized the asset then withdraw.

withdraw_obligation_collateral(
    port_finance_variable_rate_lending::id(),
    WITHDRAW_AMOUNT,
    reserve.collateral.supply_pubkey,
    sol_test_reserve.user_collateral_pubkey,
    sol_test_reserve.pubkey,
    test_obligation.pubkey,
    lending_market.pubkey,
    test_obligation.owner,
    Some(stake_account_pubkey),
    Some(staking_pool_pubkey),
)

redeem_reserve_collateral(
    port_finance_variable_rate_lending::id(),
    COLLATERAL_AMOUNT,
    user_collateral_token_account_pubkey,
    user_liquidity_token_account_pubkey,
    reserve_pubkey,
    reserve.collateral.mint_pubkey,
    reserve.liquidity.supply_pubkey,
    lending_market.pubkey,
    user_transfer_authority.pubkey(),
)

Repay

To repay, you can pass number greater then amount you borrow to repay all, for example you can pass u64::MAX in to repay all.

repay_obligation_liquidity(
    port_finance_variable_rate_lending::id(),
    liquidity_amount,
    user_liquidity_token_account_pubkey,
    reserve.liquidity.supply_pubkey,
    reserve_pubkey,
    obligation_pubkey,
    lending_market.pubkey,
    user_transfer_authority.pubkey(),
)

Liquidation

Please refer to https://github.com/port-finance/liquidator

Flash loan

We have an instruction with the following signature for flash loan:

pub enum LendingInstruction {
    // ....
    /// Make a flash loan.
    ///
    /// Accounts expected by this instruction:
    ///
    ///   0. `[writable]` Source liquidity token account.
    ///                     Minted by reserve liquidity mint.
    ///                     Must match the reserve liquidity supply.
    ///   1. `[writable]` Destination liquidity token account.
    ///                     Minted by reserve liquidity mint.
    ///   2. `[writable]` Reserve account.
    ///   3. `[]` Lending market account.
    ///   4. `[]` Derived lending market authority.
    ///   5. `[]` Flash loan receiver program account.
    ///             Must implement an instruction that has tag of 0 and a signature of `(repay_amount: u64)`
    ///             This instruction must return the amount to the source liquidity account.
    ///   6. `[]` Token program id.
    ///   7. `[writable]` Flash loan fee receiver account.
    ///                     Must match the reserve liquidity fee receiver.
    ///   8. `[writable]` Host fee receiver.
    ///   .. `[any]` Additional accounts expected by the receiving program's `ReceiveFlashLoan` instruction.
    FlashLoan {
        /// The amount that is to be borrowed
        amount: u64,
    },
}

In the implementation, we do the following in order:

Perform safety checks and calculate fees
Transfer amount from the source liquidity account to the destination liquidity account
Call the ReceiveFlashLoan function (the flash loan receiver program is required to have this function with tag 0).
The additional account required for ReceiveFlashLoan is given from the 10th account of the FlashLoan instruction, i.e. after host fee receiver.
Check that the returned amount with the fee is in the reserve account after the completion of ReceiveFlashLoan function.

The flash loan receiver program should have a ReceiveFlashLoan instruction which executes the user-defined operation and return the funds to the reserve in the end.

pub enum FlashLoanReceiverInstruction {

    /// Receive a flash loan and perform user-defined operation and finally return the fund back.
    ///
    /// Accounts expected:
    ///
    ///   0. `[writable]` Source liquidity (matching the destination from above).
    ///   1. `[writable]` Destination liquidity (matching the source from above).
    ///   2. `[]` Token program id
    ///   .. `[any]` Additional accounts provided to the lending program's `FlashLoan` instruction above.
    ReceiveFlashLoan {
        // Amount that is loaned to the receiver program
        amount: u64
    }
}

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Last updated 3 years ago

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