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Add get_spot_price_after_short method to rust-sdk #756

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Merged
merged 1 commit into from
Feb 9, 2024
Merged

Add get_spot_price_after_short method to rust-sdk #756

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18 changes: 18 additions & 0 deletions crates/hyperdrive-math/src/short/open.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,24 @@ impl State {
)
}

/// Gets the spot price after opening the short on the YieldSpace curve and
/// before calculating the fees.
pub fn get_spot_price_after_short(&self, bond_amount: FixedPoint) -> FixedPoint {
let shares_amount = self.calculate_shares_out_given_bonds_in_down(bond_amount);
self.spot_price_after_short(shares_amount * self.vault_share_price(), bond_amount)
}

fn spot_price_after_short(
&self,
base_amount: FixedPoint,
bond_amount: FixedPoint,
) -> FixedPoint {
let mut state: State = self.clone();
state.info.bond_reserves += bond_amount.into();
state.info.share_reserves -= (base_amount / state.vault_share_price()).into();
state.get_spot_price()
}

#[deprecated(since = "0.4.0", note = "please use `calculate_open_short` instead")]
pub fn get_short_deposit(
&self,
Expand Down