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| 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 | import type { Address, Hex } from '../types.ts';
/**
* Apply a percentage buffer to a hex gas value.
*
* @param gasHex - The gas value as a hex string.
* @param bufferPercent - The buffer percentage to add (e.g. 10 for 10%).
* @returns The buffered gas value as a hex string.
*/
export function applyGasBuffer(gasHex: Hex, bufferPercent: number): Hex {
const gas = BigInt(gasHex);
const buffered = gas + (gas * BigInt(bufferPercent)) / 100n;
return `0x${buffered.toString(16)}`;
}
/**
* Validate that an `eth_estimateGas` response is a valid hex string.
*
* @param result - The raw RPC response.
* @returns The validated hex string.
* @throws If the result is not a hex string.
*/
export function validateGasEstimate(result: unknown): Hex {
if (typeof result !== 'string' || !result.startsWith('0x')) {
throw new Error(
`eth_estimateGas returned unexpected value: ${String(result)}`,
);
}
return result as Hex;
}
/**
* Validate that a token `eth_call` response is a usable hex string.
*
* @param result - The raw RPC response.
* @param method - The ERC-20 method name (for error context).
* @param token - The token address (for error context).
* @returns The validated hex string.
* @throws If the result is not a non-empty hex string.
*/
export function validateTokenCallResult(
result: unknown,
method: string,
token: Address,
): Hex {
if (
typeof result !== 'string' ||
!result.startsWith('0x') ||
result === '0x'
) {
throw new Error(
`${method}() call to token ${token} returned unexpected value: ${String(result)}`,
);
}
return result as Hex;
}
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