Port Finance

1use super::*;
2use arrayref::{array_mut_ref, array_ref, array_refs, mut_array_refs};
3use solana_program::{
4    msg,
5    program_error::ProgramError,
6    program_pack::{IsInitialized, Pack, Sealed},
7    pubkey::{Pubkey, PUBKEY_BYTES},
8};
9
10/// Lending market state
11#[derive(Clone, Debug, Default, PartialEq)]
12pub struct LendingMarket {
13    /// Version of lending market
14    pub version: u8,
15    /// Bump seed for derived authority address
16    pub bump_seed: u8,
17    /// Owner authority which can add new reserves
18    pub owner: Pubkey,
19    /// Currency market prices are quoted in
20    /// e.g. "USD" null padded (`*b"USD\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"`) or a SPL token mint pubkey
21    pub quote_currency: [u8; 32],
22    /// Token program id
23    pub token_program_id: Pubkey,
24}
25
26impl LendingMarket {
27    /// Create a new lending market
28    pub fn new(params: InitLendingMarketParams) -> Self {
29        let mut lending_market = Self::default();
30        Self::init(&mut lending_market, params);
31        lending_market
32    }
33
34    /// Initialize a lending market
35    pub fn init(&mut self, params: InitLendingMarketParams) {
36        self.version = PROGRAM_VERSION;
37        self.bump_seed = params.bump_seed;
38        self.owner = params.owner;
39        self.quote_currency = params.quote_currency;
40        self.token_program_id = params.token_program_id;
41    }
42}
43
44/// Initialize a lending market
45pub struct InitLendingMarketParams {
46    /// Bump seed for derived authority address
47    pub bump_seed: u8,
48    /// Owner authority which can add new reserves
49    pub owner: Pubkey,
50    /// Currency market prices are quoted in
51    /// e.g. "USD" null padded (`*b"USD\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"`) or a SPL token mint pubkey
52    pub quote_currency: [u8; 32],
53    /// Token program id
54    pub token_program_id: Pubkey,
55}
56
57impl Sealed for LendingMarket {}
58impl IsInitialized for LendingMarket {
59    fn is_initialized(&self) -> bool {
60        self.version != UNINITIALIZED_VERSION
61    }
62}
63
64const LENDING_MARKET_LEN: usize = 258; // 1 + 1 + 32 + 32 + 32 + 160
65impl Pack for LendingMarket {
66    const LEN: usize = LENDING_MARKET_LEN;
67
68    fn pack_into_slice(&self, output: &mut [u8]) {
69        let output = array_mut_ref![output, 0, LENDING_MARKET_LEN];
70        #[allow(clippy::ptr_offset_with_cast)]
71        let (version, bump_seed, owner, quote_currency, token_program_id, _padding) =
72            mut_array_refs![output, 1, 1, PUBKEY_BYTES, 32, PUBKEY_BYTES, 160];
73
74        *version = self.version.to_le_bytes();
75        *bump_seed = self.bump_seed.to_le_bytes();
76        owner.copy_from_slice(self.owner.as_ref());
77        quote_currency.copy_from_slice(self.quote_currency.as_ref());
78        token_program_id.copy_from_slice(self.token_program_id.as_ref());
79    }
80
81    /// Unpacks a byte buffer into a [LendingMarketInfo](struct.LendingMarketInfo.html)
82    fn unpack_from_slice(input: &[u8]) -> Result<Self, ProgramError> {
83        let input = array_ref![input, 0, LENDING_MARKET_LEN];
84        #[allow(clippy::ptr_offset_with_cast)]
85        let (version, bump_seed, owner, quote_currency, token_program_id, _padding) =
86            array_refs![input, 1, 1, PUBKEY_BYTES, 32, PUBKEY_BYTES, 160];
87
88        let version = u8::from_le_bytes(*version);
89        if version > PROGRAM_VERSION {
90            msg!("Lending market version does not match lending program version");
91            return Err(ProgramError::InvalidAccountData);
92        }
93
94        Ok(Self {
95            version,
96            bump_seed: u8::from_le_bytes(*bump_seed),
97            owner: Pubkey::new_from_array(*owner),
98            quote_currency: *quote_currency,
99            token_program_id: Pubkey::new_from_array(*token_program_id),
100        })
101    }
102}

JavaScript Tests