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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 | 9x 9x 9x 9x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x | import { StacksTransaction } from '../transaction';
import { StacksMainnet, StacksNetwork } from 'micro-stacks/network';
import { PayloadType } from '../payload';
import { fetchPrivate } from 'micro-stacks/common';
/**
* Estimate the total transaction fee in microstacks for a token transfer
*
* @param {StacksTransaction} transaction - the token transfer transaction to estimate fees for
* @param {StacksNetwork} network - the Stacks network to estimate transaction for
*
* @return a promise that resolves to number of microstacks per byte
*/
export async function estimateTransfer(
transaction: StacksTransaction,
network?: StacksNetwork
): Promise<bigint> {
Iif (transaction.payload.payloadType !== PayloadType.TokenTransfer) {
throw new Error(
`Transaction fee estimation only possible with ${
PayloadType[PayloadType.TokenTransfer]
} transactions. Invoked with: ${PayloadType[transaction.payload.payloadType]}`
);
}
const requestHeaders = {
Accept: 'application/text',
};
const fetchOptions = {
method: 'GET',
headers: requestHeaders,
};
const defaultNetwork = new StacksMainnet();
const url = network
? network.getTransferFeeEstimateApiUrl()
: defaultNetwork.getTransferFeeEstimateApiUrl();
const response = await fetchPrivate(url, fetchOptions);
Iif (!response.ok) {
let msg = '';
try {
msg = await response.text();
} catch (error) {}
throw new Error(
`Error estimating transaction fee. Response ${response.status}: ${response.statusText}. Attempted to fetch ${url} and failed with the message: "${msg}"`
);
}
const feeRateResult = await response.text();
const txBytes = BigInt(transaction.serialize().byteLength);
const feeRate = BigInt(feeRateResult);
return feeRate * txBytes;
}
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