Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 1x 1x 1x 1x 1x 1x | import { Connection, PublicKey } from "@solana/web3.js";
import BN from "bn.js";
import { Market } from "./market";
export function throwIfNull<T>(
value: T | null,
message = "account not found"
): T {
Iif (value === null) {
throw new Error(message);
}
return value;
}
export const getMintDecimals = async (
connection: Connection,
mint: PublicKey
) => {
const { value } = throwIfNull(
await connection.getParsedAccountInfo(mint),
"Mint not found"
);
// @ts-ignore
return value?.data?.parsed.info.decimals;
};
export const getTokenBalance = async (
connection: Connection,
address: PublicKey
) => {
const { value } = throwIfNull(
await connection.getParsedAccountInfo(address),
"Token account does not exist"
);
// @ts-ignore
return value?.data.parsed.uiAmount;
};
export const divideBnToNumber = (numerator: BN, denominator: BN): number => {
const quotient = numerator.div(denominator).toNumber();
const rem = numerator.umod(denominator);
const gcd = rem.gcd(denominator);
return quotient + rem.div(gcd).toNumber() / denominator.div(gcd).toNumber();
};
export const computeFp32Price = (market: Market, uiPrice: number) => {
const tickSize = new BN(market.tickSize);
const decimalsMul = Math.pow(10, market.quoteDecimals - market.baseDecimals);
const baseQuoteMul =
market.baseCurrencyMultiplier.toNumber() /
market.quoteCurrencyMultiplier.toNumber();
const x = uiPrice * baseQuoteMul * decimalsMul;
const fracX = Math.pow(2, 32) * (x - Math.floor(x));
const price = new BN(x).mul(new BN(2 ** 32)).add(new BN(fracX));
const rem = price.umod(tickSize);
return price.sub(rem);
};
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