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add profit share fee calculation for VaultDepositor #20

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merged 2 commits into from
Aug 7, 2023
Merged

add profit share fee calculation for VaultDepositor #20

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3fa3bc1
add profit share fee calculation
ChesterSim Aug 4, 2023
b1d80c0
return BN for profit share calcultation
ChesterSim Aug 7, 2023
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33 changes: 31 additions & 2 deletions ts/sdk/src/accounts/vaultDepositorAccount.ts
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import { Program } from '@coral-xyz/anchor';
import { BulkAccountLoader } from '@drift-labs/sdk';
import { BN, Program } from '@coral-xyz/anchor';
import { BulkAccountLoader, PERCENTAGE_PRECISION, ZERO } from '@drift-labs/sdk';
import { PublicKey } from '@solana/web3.js';
import { DriftVaults } from '../types/drift_vaults';
import { VaultDepositor, VaultDepositorAccountEvents } from '../types/types';
Expand Down Expand Up @@ -37,4 +37,33 @@ export class VaultDepositorAccount extends VaultsProgramAccount<
): PublicKey {
return getVaultDepositorAddressSync(programId, vault, authority);
}

/**
* Calculates the proportion of a depositor's funds that will be paid as profit share fees.
*
* @param vaultProfitShare Vault's profit share fee
* @param depositorEquity Vault depositor's net deposit value
*/
calcProfitShareFeesProportion(
vaultProfitShare: BN,
depositorEquity: BN
): number {
const accountData = this.accountSubscriber.getAccountAndSlot().data;
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would use a BN to avoid random number overflow errors


const profit = depositorEquity
.sub(accountData.netDeposits)
.sub(accountData.cumulativeProfitShareAmount);

if (profit.lte(new BN(0))) {
return ZERO;
}

const profitShareAmount = profit
.mul(vaultProfitShare)
.div(PERCENTAGE_PRECISION);
const profitShareProportion =
profitShareAmount.toNumber() / depositorEquity.toNumber();

return profitShareProportion;
}
}
2 changes: 1 addition & 1 deletion ts/sdk/src/constants/index.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,3 @@
import { BN } from '@drift-labs/sdk';

export const VAULT_SHARES_PRECISION = new BN(6);
export const VAULT_SHARES_PRECISION_EXP = new BN(6);
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