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instruction.rs
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//! Instruction types
#![allow(clippy::too_many_arguments)]
#[cfg(feature = "fuzz")]
use arbitrary::Arbitrary;
use {
crate::{
curve::{base::SwapCurve, fees::Fees},
error::SwapError,
},
solana_program::{
instruction::{AccountMeta, Instruction},
program_error::ProgramError,
program_pack::Pack,
pubkey::Pubkey,
},
std::{convert::TryInto, mem::size_of},
};
/// Initialize instruction data
#[repr(C)]
#[derive(Debug, PartialEq)]
pub struct Initialize {
/// all swap fees
pub fees: Fees,
/// swap curve info for pool, including CurveType and anything
/// else that may be required
pub swap_curve: SwapCurve,
}
/// Swap instruction data
#[cfg_attr(feature = "fuzz", derive(Arbitrary))]
#[repr(C)]
#[derive(Clone, Debug, PartialEq)]
pub struct Swap {
/// SOURCE amount to transfer, output to DESTINATION is based on the
/// exchange rate
pub amount_in: u64,
/// Minimum amount of DESTINATION token to output, prevents excessive
/// slippage
pub minimum_amount_out: u64,
}
/// DepositAllTokenTypes instruction data
#[cfg_attr(feature = "fuzz", derive(Arbitrary))]
#[repr(C)]
#[derive(Clone, Debug, PartialEq)]
pub struct DepositAllTokenTypes {
/// Pool token amount to transfer. token_a and token_b amount are set by
/// the current exchange rate and size of the pool
pub pool_token_amount: u64,
/// Maximum token A amount to deposit, prevents excessive slippage
pub maximum_token_a_amount: u64,
/// Maximum token B amount to deposit, prevents excessive slippage
pub maximum_token_b_amount: u64,
}
/// WithdrawAllTokenTypes instruction data
#[cfg_attr(feature = "fuzz", derive(Arbitrary))]
#[repr(C)]
#[derive(Clone, Debug, PartialEq)]
pub struct WithdrawAllTokenTypes {
/// Amount of pool tokens to burn. User receives an output of token a
/// and b based on the percentage of the pool tokens that are returned.
pub pool_token_amount: u64,
/// Minimum amount of token A to receive, prevents excessive slippage
pub minimum_token_a_amount: u64,
/// Minimum amount of token B to receive, prevents excessive slippage
pub minimum_token_b_amount: u64,
}
/// Deposit one token type, exact amount in instruction data
#[cfg_attr(feature = "fuzz", derive(Arbitrary))]
#[repr(C)]
#[derive(Clone, Debug, PartialEq)]
pub struct DepositSingleTokenTypeExactAmountIn {
/// Token amount to deposit
pub source_token_amount: u64,
/// Pool token amount to receive in exchange. The amount is set by
/// the current exchange rate and size of the pool
pub minimum_pool_token_amount: u64,
}
/// WithdrawSingleTokenTypeExactAmountOut instruction data
#[cfg_attr(feature = "fuzz", derive(Arbitrary))]
#[repr(C)]
#[derive(Clone, Debug, PartialEq)]
pub struct WithdrawSingleTokenTypeExactAmountOut {
/// Amount of token A or B to receive
pub destination_token_amount: u64,
/// Maximum amount of pool tokens to burn. User receives an output of token
/// A or B based on the percentage of the pool tokens that are returned.
pub maximum_pool_token_amount: u64,
}
/// Instructions supported by the token swap program.
#[repr(C)]
#[derive(Debug, PartialEq)]
pub enum SwapInstruction {
/// Initializes a new swap
///
/// 0. `[writable, signer]` New Token-swap to create.
/// 1. `[]` swap authority derived from
/// `create_program_address(&[Token-swap account])`
/// 2. `[]` token_a Account. Must be non zero, owned by swap authority.
/// 3. `[]` token_b Account. Must be non zero, owned by swap authority.
/// 4. `[writable]` Pool Token Mint. Must be empty, owned by swap
/// authority.
/// 5. `[]` Pool Token Account to deposit trading and withdraw fees. Must
/// be empty, not owned by swap authority
/// 6. `[writable]` Pool Token Account to deposit the initial pool token
/// supply. Must be empty, not owned by swap authority.
/// 7. `[]` Pool Token program id
Initialize(Initialize),
/// Swap the tokens in the pool.
///
/// 0. `[]` Token-swap
/// 1. `[]` swap authority
/// 2. `[]` user transfer authority
/// 3. `[writable]` token_(A|B) SOURCE Account, amount is transferable by
/// user transfer authority,
/// 4. `[writable]` token_(A|B) Base Account to swap INTO. Must be the
/// SOURCE token.
/// 5. `[writable]` token_(A|B) Base Account to swap FROM. Must be the
/// DESTINATION token.
/// 6. `[writable]` token_(A|B) DESTINATION Account assigned to USER as
/// the owner.
/// 7. `[writable]` Pool token mint, to generate trading fees
/// 8. `[writable]` Fee account, to receive trading fees
/// 9. `[]` Token (A|B) SOURCE mint
/// 10. `[]` Token (A|B) DESTINATION mint
/// 11. `[]` Token (A|B) SOURCE program id
/// 12. `[]` Token (A|B) DESTINATION program id
/// 13. `[]` Pool Token program id
/// 14. `[optional, writable]` Host fee account to receive additional
/// trading fees
Swap(Swap),
/// Deposit both types of tokens into the pool. The output is a "pool"
/// token representing ownership in the pool. Inputs are converted to
/// the current ratio.
///
/// 0. `[]` Token-swap
/// 1. `[]` swap authority
/// 2. `[]` user transfer authority
/// 3. `[writable]` token_a user transfer authority can transfer amount,
/// 4. `[writable]` token_b user transfer authority can transfer amount,
/// 5. `[writable]` token_a Base Account to deposit into.
/// 6. `[writable]` token_b Base Account to deposit into.
/// 7. `[writable]` Pool MINT account, swap authority is the owner.
/// 8. `[writable]` Pool Account to deposit the generated tokens, user is
/// the owner.
/// 9. `[]` Token A mint
/// 10. `[]` Token B mint
/// 11. `[]` Token A program id
/// 12. `[]` Token B program id
/// 13. `[]` Pool Token program id
DepositAllTokenTypes(DepositAllTokenTypes),
/// Withdraw both types of tokens from the pool at the current ratio,
/// given pool tokens. The pool tokens are burned in exchange for an
/// equivalent amount of token A and B.
///
/// 0. `[]` Token-swap
/// 1. `[]` swap authority
/// 2. `[]` user transfer authority
/// 3. `[writable]` Pool mint account, swap authority is the owner
/// 4. `[writable]` SOURCE Pool account, amount is transferable by user
/// transfer authority.
/// 5. `[writable]` token_a Swap Account to withdraw FROM.
/// 6. `[writable]` token_b Swap Account to withdraw FROM.
/// 7. `[writable]` token_a user Account to credit.
/// 8. `[writable]` token_b user Account to credit.
/// 9. `[writable]` Fee account, to receive withdrawal fees
/// 10. `[]` Token A mint
/// 11. `[]` Token B mint
/// 12. `[]` Pool Token program id
/// 13. `[]` Token A program id
/// 14. `[]` Token B program id
WithdrawAllTokenTypes(WithdrawAllTokenTypes),
/// Deposit one type of tokens into the pool. The output is a "pool"
/// token representing ownership into the pool. Input token is
/// converted as if a swap and deposit all token types were performed.
///
/// 0. `[]` Token-swap
/// 1. `[]` swap authority
/// 2. `[]` user transfer authority
/// 3. `[writable]` token_(A|B) SOURCE Account, amount is transferable by
/// user transfer authority,
/// 4. `[writable]` token_a Swap Account, may deposit INTO.
/// 5. `[writable]` token_b Swap Account, may deposit INTO.
/// 6. `[writable]` Pool MINT account, swap authority is the owner.
/// 7. `[writable]` Pool Account to deposit the generated tokens, user is
/// the owner.
/// 8. `[]` Token (A|B) SOURCE mint
/// 9. `[]` Token (A|B) SOURCE program id
/// 10. `[]` Pool Token program id
DepositSingleTokenTypeExactAmountIn(DepositSingleTokenTypeExactAmountIn),
/// Withdraw one token type from the pool at the current ratio given the
/// exact amount out expected.
///
/// 0. `[]` Token-swap
/// 1. `[]` swap authority
/// 2. `[]` user transfer authority
/// 3. `[writable]` Pool mint account, swap authority is the owner
/// 4. `[writable]` SOURCE Pool account, amount is transferable by user
/// transfer authority.
/// 5. `[writable]` token_a Swap Account to potentially withdraw from.
/// 6. `[writable]` token_b Swap Account to potentially withdraw from.
/// 7. `[writable]` token_(A|B) User Account to credit
/// 8. `[writable]` Fee account, to receive withdrawal fees
/// 9. `[]` Token (A|B) DESTINATION mint
/// 10. `[]` Pool Token program id
/// 11. `[]` Token (A|B) DESTINATION program id
WithdrawSingleTokenTypeExactAmountOut(WithdrawSingleTokenTypeExactAmountOut),
}
impl SwapInstruction {
/// Unpacks a byte buffer into a
/// [SwapInstruction](enum.SwapInstruction.html).
pub fn unpack(input: &[u8]) -> Result<Self, ProgramError> {
let (&tag, rest) = input.split_first().ok_or(SwapError::InvalidInstruction)?;
Ok(match tag {
0 => {
if rest.len() >= Fees::LEN {
let (fees, rest) = rest.split_at(Fees::LEN);
let fees = Fees::unpack_unchecked(fees)?;
let swap_curve = SwapCurve::unpack_unchecked(rest)?;
Self::Initialize(Initialize { fees, swap_curve })
} else {
return Err(SwapError::InvalidInstruction.into());
}
}
1 => {
let (amount_in, rest) = Self::unpack_u64(rest)?;
let (minimum_amount_out, _rest) = Self::unpack_u64(rest)?;
Self::Swap(Swap {
amount_in,
minimum_amount_out,
})
}
2 => {
let (pool_token_amount, rest) = Self::unpack_u64(rest)?;
let (maximum_token_a_amount, rest) = Self::unpack_u64(rest)?;
let (maximum_token_b_amount, _rest) = Self::unpack_u64(rest)?;
Self::DepositAllTokenTypes(DepositAllTokenTypes {
pool_token_amount,
maximum_token_a_amount,
maximum_token_b_amount,
})
}
3 => {
let (pool_token_amount, rest) = Self::unpack_u64(rest)?;
let (minimum_token_a_amount, rest) = Self::unpack_u64(rest)?;
let (minimum_token_b_amount, _rest) = Self::unpack_u64(rest)?;
Self::WithdrawAllTokenTypes(WithdrawAllTokenTypes {
pool_token_amount,
minimum_token_a_amount,
minimum_token_b_amount,
})
}
4 => {
let (source_token_amount, rest) = Self::unpack_u64(rest)?;
let (minimum_pool_token_amount, _rest) = Self::unpack_u64(rest)?;
Self::DepositSingleTokenTypeExactAmountIn(DepositSingleTokenTypeExactAmountIn {
source_token_amount,
minimum_pool_token_amount,
})
}
5 => {
let (destination_token_amount, rest) = Self::unpack_u64(rest)?;
let (maximum_pool_token_amount, _rest) = Self::unpack_u64(rest)?;
Self::WithdrawSingleTokenTypeExactAmountOut(WithdrawSingleTokenTypeExactAmountOut {
destination_token_amount,
maximum_pool_token_amount,
})
}
_ => return Err(SwapError::InvalidInstruction.into()),
})
}
fn unpack_u64(input: &[u8]) -> Result<(u64, &[u8]), ProgramError> {
if input.len() >= 8 {
let (amount, rest) = input.split_at(8);
let amount = amount
.get(..8)
.and_then(|slice| slice.try_into().ok())
.map(u64::from_le_bytes)
.ok_or(SwapError::InvalidInstruction)?;
Ok((amount, rest))
} else {
Err(SwapError::InvalidInstruction.into())
}
}
/// Packs a [SwapInstruction](enum.SwapInstruction.html) into a byte buffer.
pub fn pack(&self) -> Vec<u8> {
let mut buf = Vec::with_capacity(size_of::<Self>());
match self {
Self::Initialize(Initialize { fees, swap_curve }) => {
buf.push(0);
let mut fees_slice = [0u8; Fees::LEN];
Pack::pack_into_slice(fees, &mut fees_slice[..]);
buf.extend_from_slice(&fees_slice);
let mut swap_curve_slice = [0u8; SwapCurve::LEN];
Pack::pack_into_slice(swap_curve, &mut swap_curve_slice[..]);
buf.extend_from_slice(&swap_curve_slice);
}
Self::Swap(Swap {
amount_in,
minimum_amount_out,
}) => {
buf.push(1);
buf.extend_from_slice(&amount_in.to_le_bytes());
buf.extend_from_slice(&minimum_amount_out.to_le_bytes());
}
Self::DepositAllTokenTypes(DepositAllTokenTypes {
pool_token_amount,
maximum_token_a_amount,
maximum_token_b_amount,
}) => {
buf.push(2);
buf.extend_from_slice(&pool_token_amount.to_le_bytes());
buf.extend_from_slice(&maximum_token_a_amount.to_le_bytes());
buf.extend_from_slice(&maximum_token_b_amount.to_le_bytes());
}
Self::WithdrawAllTokenTypes(WithdrawAllTokenTypes {
pool_token_amount,
minimum_token_a_amount,
minimum_token_b_amount,
}) => {
buf.push(3);
buf.extend_from_slice(&pool_token_amount.to_le_bytes());
buf.extend_from_slice(&minimum_token_a_amount.to_le_bytes());
buf.extend_from_slice(&minimum_token_b_amount.to_le_bytes());
}
Self::DepositSingleTokenTypeExactAmountIn(DepositSingleTokenTypeExactAmountIn {
source_token_amount,
minimum_pool_token_amount,
}) => {
buf.push(4);
buf.extend_from_slice(&source_token_amount.to_le_bytes());
buf.extend_from_slice(&minimum_pool_token_amount.to_le_bytes());
}
Self::WithdrawSingleTokenTypeExactAmountOut(
WithdrawSingleTokenTypeExactAmountOut {
destination_token_amount,
maximum_pool_token_amount,
},
) => {
buf.push(5);
buf.extend_from_slice(&destination_token_amount.to_le_bytes());
buf.extend_from_slice(&maximum_pool_token_amount.to_le_bytes());
}
}
buf
}
}
/// Creates an 'initialize' instruction.
pub fn initialize(
program_id: &Pubkey,
token_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
token_a_pubkey: &Pubkey,
token_b_pubkey: &Pubkey,
pool_pubkey: &Pubkey,
fee_pubkey: &Pubkey,
destination_pubkey: &Pubkey,
fees: Fees,
swap_curve: SwapCurve,
) -> Result<Instruction, ProgramError> {
let init_data = SwapInstruction::Initialize(Initialize { fees, swap_curve });
let data = init_data.pack();
let accounts = vec![
AccountMeta::new(*swap_pubkey, true),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*token_a_pubkey, false),
AccountMeta::new_readonly(*token_b_pubkey, false),
AccountMeta::new(*pool_pubkey, false),
AccountMeta::new_readonly(*fee_pubkey, false),
AccountMeta::new(*destination_pubkey, false),
AccountMeta::new_readonly(*token_program_id, false),
];
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Creates a 'deposit_all_token_types' instruction.
pub fn deposit_all_token_types(
program_id: &Pubkey,
token_a_program_id: &Pubkey,
token_b_program_id: &Pubkey,
pool_token_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
user_transfer_authority_pubkey: &Pubkey,
deposit_token_a_pubkey: &Pubkey,
deposit_token_b_pubkey: &Pubkey,
swap_token_a_pubkey: &Pubkey,
swap_token_b_pubkey: &Pubkey,
pool_mint_pubkey: &Pubkey,
destination_pubkey: &Pubkey,
token_a_mint_pubkey: &Pubkey,
token_b_mint_pubkey: &Pubkey,
instruction: DepositAllTokenTypes,
) -> Result<Instruction, ProgramError> {
let data = SwapInstruction::DepositAllTokenTypes(instruction).pack();
let accounts = vec![
AccountMeta::new_readonly(*swap_pubkey, false),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*user_transfer_authority_pubkey, true),
AccountMeta::new(*deposit_token_a_pubkey, false),
AccountMeta::new(*deposit_token_b_pubkey, false),
AccountMeta::new(*swap_token_a_pubkey, false),
AccountMeta::new(*swap_token_b_pubkey, false),
AccountMeta::new(*pool_mint_pubkey, false),
AccountMeta::new(*destination_pubkey, false),
AccountMeta::new_readonly(*token_a_mint_pubkey, false),
AccountMeta::new_readonly(*token_b_mint_pubkey, false),
AccountMeta::new_readonly(*token_a_program_id, false),
AccountMeta::new_readonly(*token_b_program_id, false),
AccountMeta::new_readonly(*pool_token_program_id, false),
];
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Creates a 'withdraw_all_token_types' instruction.
pub fn withdraw_all_token_types(
program_id: &Pubkey,
pool_token_program_id: &Pubkey,
token_a_program_id: &Pubkey,
token_b_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
user_transfer_authority_pubkey: &Pubkey,
pool_mint_pubkey: &Pubkey,
fee_account_pubkey: &Pubkey,
source_pubkey: &Pubkey,
swap_token_a_pubkey: &Pubkey,
swap_token_b_pubkey: &Pubkey,
destination_token_a_pubkey: &Pubkey,
destination_token_b_pubkey: &Pubkey,
token_a_mint_pubkey: &Pubkey,
token_b_mint_pubkey: &Pubkey,
instruction: WithdrawAllTokenTypes,
) -> Result<Instruction, ProgramError> {
let data = SwapInstruction::WithdrawAllTokenTypes(instruction).pack();
let accounts = vec![
AccountMeta::new_readonly(*swap_pubkey, false),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*user_transfer_authority_pubkey, true),
AccountMeta::new(*pool_mint_pubkey, false),
AccountMeta::new(*source_pubkey, false),
AccountMeta::new(*swap_token_a_pubkey, false),
AccountMeta::new(*swap_token_b_pubkey, false),
AccountMeta::new(*destination_token_a_pubkey, false),
AccountMeta::new(*destination_token_b_pubkey, false),
AccountMeta::new(*fee_account_pubkey, false),
AccountMeta::new_readonly(*token_a_mint_pubkey, false),
AccountMeta::new_readonly(*token_b_mint_pubkey, false),
AccountMeta::new_readonly(*pool_token_program_id, false),
AccountMeta::new_readonly(*token_a_program_id, false),
AccountMeta::new_readonly(*token_b_program_id, false),
];
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Creates a 'deposit_single_token_type_exact_amount_in' instruction.
pub fn deposit_single_token_type_exact_amount_in(
program_id: &Pubkey,
source_token_program_id: &Pubkey,
pool_token_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
user_transfer_authority_pubkey: &Pubkey,
source_token_pubkey: &Pubkey,
swap_token_a_pubkey: &Pubkey,
swap_token_b_pubkey: &Pubkey,
pool_mint_pubkey: &Pubkey,
destination_pubkey: &Pubkey,
source_mint_pubkey: &Pubkey,
instruction: DepositSingleTokenTypeExactAmountIn,
) -> Result<Instruction, ProgramError> {
let data = SwapInstruction::DepositSingleTokenTypeExactAmountIn(instruction).pack();
let accounts = vec![
AccountMeta::new_readonly(*swap_pubkey, false),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*user_transfer_authority_pubkey, true),
AccountMeta::new(*source_token_pubkey, false),
AccountMeta::new(*swap_token_a_pubkey, false),
AccountMeta::new(*swap_token_b_pubkey, false),
AccountMeta::new(*pool_mint_pubkey, false),
AccountMeta::new(*destination_pubkey, false),
AccountMeta::new_readonly(*source_mint_pubkey, false),
AccountMeta::new_readonly(*source_token_program_id, false),
AccountMeta::new_readonly(*pool_token_program_id, false),
];
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Creates a 'withdraw_single_token_type_exact_amount_out' instruction.
pub fn withdraw_single_token_type_exact_amount_out(
program_id: &Pubkey,
pool_token_program_id: &Pubkey,
destination_token_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
user_transfer_authority_pubkey: &Pubkey,
pool_mint_pubkey: &Pubkey,
fee_account_pubkey: &Pubkey,
pool_token_source_pubkey: &Pubkey,
swap_token_a_pubkey: &Pubkey,
swap_token_b_pubkey: &Pubkey,
destination_pubkey: &Pubkey,
destination_mint_pubkey: &Pubkey,
instruction: WithdrawSingleTokenTypeExactAmountOut,
) -> Result<Instruction, ProgramError> {
let data = SwapInstruction::WithdrawSingleTokenTypeExactAmountOut(instruction).pack();
let accounts = vec![
AccountMeta::new_readonly(*swap_pubkey, false),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*user_transfer_authority_pubkey, true),
AccountMeta::new(*pool_mint_pubkey, false),
AccountMeta::new(*pool_token_source_pubkey, false),
AccountMeta::new(*swap_token_a_pubkey, false),
AccountMeta::new(*swap_token_b_pubkey, false),
AccountMeta::new(*destination_pubkey, false),
AccountMeta::new(*fee_account_pubkey, false),
AccountMeta::new_readonly(*destination_mint_pubkey, false),
AccountMeta::new_readonly(*pool_token_program_id, false),
AccountMeta::new_readonly(*destination_token_program_id, false),
];
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Creates a 'swap' instruction.
pub fn swap(
program_id: &Pubkey,
source_token_program_id: &Pubkey,
destination_token_program_id: &Pubkey,
pool_token_program_id: &Pubkey,
swap_pubkey: &Pubkey,
authority_pubkey: &Pubkey,
user_transfer_authority_pubkey: &Pubkey,
source_pubkey: &Pubkey,
swap_source_pubkey: &Pubkey,
swap_destination_pubkey: &Pubkey,
destination_pubkey: &Pubkey,
pool_mint_pubkey: &Pubkey,
pool_fee_pubkey: &Pubkey,
source_mint_pubkey: &Pubkey,
destination_mint_pubkey: &Pubkey,
host_fee_pubkey: Option<&Pubkey>,
instruction: Swap,
) -> Result<Instruction, ProgramError> {
let data = SwapInstruction::Swap(instruction).pack();
let mut accounts = vec![
AccountMeta::new_readonly(*swap_pubkey, false),
AccountMeta::new_readonly(*authority_pubkey, false),
AccountMeta::new_readonly(*user_transfer_authority_pubkey, true),
AccountMeta::new(*source_pubkey, false),
AccountMeta::new(*swap_source_pubkey, false),
AccountMeta::new(*swap_destination_pubkey, false),
AccountMeta::new(*destination_pubkey, false),
AccountMeta::new(*pool_mint_pubkey, false),
AccountMeta::new(*pool_fee_pubkey, false),
AccountMeta::new_readonly(*source_mint_pubkey, false),
AccountMeta::new_readonly(*destination_mint_pubkey, false),
AccountMeta::new_readonly(*source_token_program_id, false),
AccountMeta::new_readonly(*destination_token_program_id, false),
AccountMeta::new_readonly(*pool_token_program_id, false),
];
if let Some(host_fee_pubkey) = host_fee_pubkey {
accounts.push(AccountMeta::new(*host_fee_pubkey, false));
}
Ok(Instruction {
program_id: *program_id,
accounts,
data,
})
}
/// Unpacks a reference from a bytes buffer.
/// TODO actually pack / unpack instead of relying on normal memory layout.
pub fn unpack<T>(input: &[u8]) -> Result<&T, ProgramError> {
if input.len() < size_of::<u8>() + size_of::<T>() {
return Err(ProgramError::InvalidAccountData);
}
#[allow(clippy::cast_ptr_alignment)]
let val: &T = unsafe { &*(&input[1] as *const u8 as *const T) };
Ok(val)
}
#[cfg(test)]
mod tests {
use {
super::*,
crate::curve::{base::CurveType, offset::OffsetCurve},
std::sync::Arc,
};
#[test]
fn pack_intialize() {
let trade_fee_numerator: u64 = 1;
let trade_fee_denominator: u64 = 4;
let owner_trade_fee_numerator: u64 = 2;
let owner_trade_fee_denominator: u64 = 5;
let owner_withdraw_fee_numerator: u64 = 1;
let owner_withdraw_fee_denominator: u64 = 3;
let host_fee_numerator: u64 = 5;
let host_fee_denominator: u64 = 20;
let fees = Fees {
trade_fee_numerator,
trade_fee_denominator,
owner_trade_fee_numerator,
owner_trade_fee_denominator,
owner_withdraw_fee_numerator,
owner_withdraw_fee_denominator,
host_fee_numerator,
host_fee_denominator,
};
let token_b_offset: u64 = 1_000_000_000;
let curve_type = CurveType::Offset;
let calculator = Arc::new(OffsetCurve { token_b_offset });
let swap_curve = SwapCurve {
curve_type,
calculator,
};
let check = SwapInstruction::Initialize(Initialize { fees, swap_curve });
let packed = check.pack();
let mut expect = vec![0u8];
expect.extend_from_slice(&trade_fee_numerator.to_le_bytes());
expect.extend_from_slice(&trade_fee_denominator.to_le_bytes());
expect.extend_from_slice(&owner_trade_fee_numerator.to_le_bytes());
expect.extend_from_slice(&owner_trade_fee_denominator.to_le_bytes());
expect.extend_from_slice(&owner_withdraw_fee_numerator.to_le_bytes());
expect.extend_from_slice(&owner_withdraw_fee_denominator.to_le_bytes());
expect.extend_from_slice(&host_fee_numerator.to_le_bytes());
expect.extend_from_slice(&host_fee_denominator.to_le_bytes());
expect.push(curve_type as u8);
expect.extend_from_slice(&token_b_offset.to_le_bytes());
expect.extend_from_slice(&[0u8; 24]);
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
#[test]
fn pack_swap() {
let amount_in: u64 = 2;
let minimum_amount_out: u64 = 10;
let check = SwapInstruction::Swap(Swap {
amount_in,
minimum_amount_out,
});
let packed = check.pack();
let mut expect = vec![1];
expect.extend_from_slice(&amount_in.to_le_bytes());
expect.extend_from_slice(&minimum_amount_out.to_le_bytes());
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
#[test]
fn pack_deposit() {
let pool_token_amount: u64 = 5;
let maximum_token_a_amount: u64 = 10;
let maximum_token_b_amount: u64 = 20;
let check = SwapInstruction::DepositAllTokenTypes(DepositAllTokenTypes {
pool_token_amount,
maximum_token_a_amount,
maximum_token_b_amount,
});
let packed = check.pack();
let mut expect = vec![2];
expect.extend_from_slice(&pool_token_amount.to_le_bytes());
expect.extend_from_slice(&maximum_token_a_amount.to_le_bytes());
expect.extend_from_slice(&maximum_token_b_amount.to_le_bytes());
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
#[test]
fn pack_withdraw() {
let pool_token_amount: u64 = 1212438012089;
let minimum_token_a_amount: u64 = 102198761982612;
let minimum_token_b_amount: u64 = 2011239855213;
let check = SwapInstruction::WithdrawAllTokenTypes(WithdrawAllTokenTypes {
pool_token_amount,
minimum_token_a_amount,
minimum_token_b_amount,
});
let packed = check.pack();
let mut expect = vec![3];
expect.extend_from_slice(&pool_token_amount.to_le_bytes());
expect.extend_from_slice(&minimum_token_a_amount.to_le_bytes());
expect.extend_from_slice(&minimum_token_b_amount.to_le_bytes());
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
#[test]
fn pack_deposit_one_exact_in() {
let source_token_amount: u64 = 10;
let minimum_pool_token_amount: u64 = 5;
let check = SwapInstruction::DepositSingleTokenTypeExactAmountIn(
DepositSingleTokenTypeExactAmountIn {
source_token_amount,
minimum_pool_token_amount,
},
);
let packed = check.pack();
let mut expect = vec![4];
expect.extend_from_slice(&source_token_amount.to_le_bytes());
expect.extend_from_slice(&minimum_pool_token_amount.to_le_bytes());
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
#[test]
fn pack_withdraw_one_exact_out() {
let destination_token_amount: u64 = 102198761982612;
let maximum_pool_token_amount: u64 = 1212438012089;
let check = SwapInstruction::WithdrawSingleTokenTypeExactAmountOut(
WithdrawSingleTokenTypeExactAmountOut {
destination_token_amount,
maximum_pool_token_amount,
},
);
let packed = check.pack();
let mut expect = vec![5];
expect.extend_from_slice(&destination_token_amount.to_le_bytes());
expect.extend_from_slice(&maximum_pool_token_amount.to_le_bytes());
assert_eq!(packed, expect);
let unpacked = SwapInstruction::unpack(&expect).unwrap();
assert_eq!(unpacked, check);
}
}