SoroswapPair

SoroswapPair contract interface: deposit, swap, withdraw, reserves, and the standard token functions.

The SoroswapPair Contract implements the token interface (hence, it has the same functions that any Stellar Asset Contract) and it also has the specific functions for a liquidity pool to exist.

Check the code here: https://github.com/soroswap/core/tree/main/contracts/pair

Here is the contract interface:

pub trait SoroswapPairTrait{
    /// Initializes a new Soroswap pair by setting token addresses, factory, and initial reserves.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    /// * `factory` - The address of the Soroswap factory contract.
    /// * `token_0` - The address of the first token in the pair.
    /// * `token_1` - The address of the second token in the pair.
    fn initialize(e: Env, factory: Address, token_0: Address, token_1: Address)-> Result<(), SoroswapPairError>;

    /// Deposits tokens into the Soroswap pair and mints LP tokens in return.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    /// * `to` - The address where the minted LP tokens will be sent.
    ///
    /// # Returns
    /// The amount of minted LP tokens.
    /// Possible errors:
    /// - `SoroswapPairError::NotInitialized`: The Soroswap pair has not been initialized.
    /// - `SoroswapPairError::DepositInsufficientAmountToken0`: Insufficient amount of token 0 sent.
    /// - `SoroswapPairError::DepositInsufficientAmountToken1`: Insufficient amount of token 1 sent.
    /// - `SoroswapPairError::DepositInsufficientFirstLiquidity`: Insufficient first liquidity minted.
    /// - `SoroswapPairError::DepositInsufficientLiquidityMinted`: Insufficient liquidity minted.
    /// - `SoroswapPairError::UpdateOverflow`: Overflow occurred during update.
    fn deposit(e:Env, to: Address)  -> Result<i128, SoroswapPairError>;

    /// Executes a token swap within the Soroswap pair.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    /// * `amount_0_out` - The desired amount of the first token to receive.
    /// * `amount_1_out` - The desired amount of the second token to receive.
    /// * `to` - The address where the swapped tokens will be sent.
    ////// # Errors
    /// Returns an error if the swap cannot be executed. Possible errors include:
    /// - `SoroswapPairError::NotInitialized`
    /// - `SoroswapPairError::SwapInsufficientOutputAmount`
    /// - `SoroswapPairError::SwapNegativesOutNotSupported`
    /// - `SoroswapPairError::SwapInsufficientLiquidity`
    /// - `SoroswapPairError::SwapInvalidTo`
    /// - `SoroswapPairError::SwapInsufficientInputAmount`
    /// - `SoroswapPairError::SwapNegativesInNotSupported`
    /// - `SoroswapPairError::SwapKConstantNotMet`: If the K constant condition is not met after the swap.
    fn swap(e: Env, amount_0_out: i128, amount_1_out: i128, to: Address) -> Result<(), SoroswapPairError>;

    /// Withdraws liquidity from the Soroswap pair, burning LP tokens and returning the corresponding tokens to the user.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    /// * `to` - The address where the withdrawn tokens will be sent.
    ///
    /// # Returns
    /// A tuple containing the amounts of token 0 and token 1 withdrawn from the pair.
    fn withdraw(e: Env, to: Address) -> Result<(i128, i128), SoroswapPairError>;

    /// Skims excess tokens from reserves and sends them to the specified address.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    /// * `to` - The address where the excess tokens will be sent.
    fn skim(e: Env, to: Address);

    /// Forces reserves to match current balances.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    fn sync(e: Env);

    /// Returns the address of the first token in the Soroswap pair.
    fn token_0(e: Env) -> Address;
    
    /// Returns the address of the second token in the Soroswap pair.
    fn token_1(e: Env) -> Address;
    
    /// Returns the address of the Soroswap factory contract.
    fn factory(e: Env) -> Address;

    /// Returns the value of the last product of reserves (`K`) stored in the contract.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    ///
    /// # Returns
    /// The value of the last product of reserves (`K`).
    fn k_last(e: Env) -> i128;

    /// Returns the current reserves of both tokens.
    ///
    /// # Arguments
    /// * `e` - The runtime environment.
    ///
    /// # Returns
    /// A tuple containing the reserves of token 0 and token 1.
    fn get_reserves(e: Env) -> (i128, i128);

}

#[contract]
pub struct SoroswapPairToken;

#[contractimpl]
impl SoroswapPairToken {

    pub fn total_supply(e: Env) -> i128;
}

#[contractimpl]
impl token::Interface for SoroswapPairToken {

    fn allowance(e: Env, from: Address, spender: Address) -> i128;

    fn approve(e: Env, from: Address, spender: Address, amount: i128, expiration_ledger: u32);

    fn balance(e: Env, id: Address) -> i128;

    fn transfer(e: Env, from: Address, to: Address, amount: i128);

    fn transfer_from(e: Env, spender: Address, from: Address, to: Address, amount: i128);

    fn burn(e: Env, from: Address, amount: i128);

    fn burn_from(e: Env, spender: Address, from: Address, amount: i128);

    fn decimals(e: Env) -> u32;

    fn name(e: Env) -> String;

    fn symbol(e: Env) -> String;
}