chaingate/dist/esm/Currencies/CurrencyWallet/abstract/UtxoWallet/UtxoTransaction.js

A complete TypeScript library for connecting to and making transactions on different blockchains

import { UtxoFee } from './UtxoFee';
import { bytesToHex, hexToBytes } from '../../../../InternalUtils/Utils';
import * as btc from '@scure/btc-signer';
import { Transaction } from '../../Transaction';
import { UtxoBroadcastedTransaction } from './UtxoBroadcastedTransaction';
import { toBase, toSatoshi } from './UtxoUtils';
import { toDecimal } from '../../../../InternalUtils/NumberLike';
export class UtxoTransaction extends Transaction {
    utils;
    state;
    privateKeyProvider;
    networkParams;
    constructor(utils, fromAddress, toAddress, amount, networkParams, privateKeyProvider) {
        super(fromAddress, toAddress, amount);
        this.utils = utils;
        this.state = { utxos: [], page: 0, crawled: false };
        this.networkParams = networkParams;
        this.privateKeyProvider = privateKeyProvider;
    }
    async broadcast(fee) {
        if (typeof fee === 'string')
            fee = (this._suggestedFees ?? (await this.buildSuggestedFees()))[fee]; // Param passed is fee level
        await this.findUtxos(fee.feePerKb);
        const transaction = this.createTransaction(fee.feePerKb);
        const txSigned = await this.sign(transaction.vins, transaction.vouts);
        // Broadcast transaction
        const broadcastTx = await this.utils.broadcastTransaction(txSigned);
        return new UtxoBroadcastedTransaction(this.utils, broadcastTx.transactionId);
    }
    async fee(fee, unit) {
        const currencySymbol = this.utils.currencyInfo.symbol;
        if (typeof fee == 'string')
            fee = this.utils.amount(toDecimal(fee), currencySymbol);
        const feeBase = fee.baseAmount;
        let feePerKb;
        if (unit == 'satoshi/kB')
            feePerKb = this.utils.amount(feeBase, 'btc');
        else if (unit == 'satoshi/byte')
            feePerKb = this.utils.amount(toDecimal(feeBase).div(1e8).mul(1000), currencySymbol);
        else if (unit == `${this.utils.currencyInfo.symbol}/kB`)
            feePerKb = this.utils.amount(toDecimal(feeBase), currencySymbol);
        else if (unit == `${this.utils.currencyInfo.symbol}/byte`)
            feePerKb = this.utils.amount(toDecimal(feeBase).mul(1000), currencySymbol);
        else
            throw new Error('Unsupported unit');
        return this.feePerKb(feePerKb, null);
    }
    async buildSuggestedFees() {
        const feeRates = await this.utils.getFeeRate();
        return {
            low: await this.feePerKb(feeRates.low.feePerKb, feeRates.low.confirmationTimeSecs),
            normal: await this.feePerKb(feeRates.normal.feePerKb, feeRates.normal.confirmationTimeSecs),
            high: await this.feePerKb(feeRates.high.feePerKb, feeRates.high.confirmationTimeSecs),
            maximum: await this.feePerKb(feeRates.maximum.feePerKb, feeRates.maximum.confirmationTimeSecs),
        };
    }
    async feePerKb(feePerKb, confirmationTimeSecs) {
        const currencySymbol = this.utils.currencyInfo.symbol;
        await this.findUtxos(feePerKb);
        const selected = this.createTransaction(feePerKb);
        return new UtxoFee(feePerKb, true, !!selected, confirmationTimeSecs, selected ? this.utils.amount(selected?.feeBase, currencySymbol) : null);
    }
    async findUtxos(feePerKb) {
        // 1) Check if the provided UTXOs already suffice
        if (this.createTransaction(feePerKb)) {
            return;
        }
        // 2) Otherwise, keep fetching until we either have enough or get no more UTXOs
        while (!this.state.crawled) {
            const utxosByAddress = await this.utils.addressUtxos(this.fromAddress, this.state.page);
            // If no new UTXOs are returned, break out of loop
            if (utxosByAddress.utxos.length === 0) {
                this.state.crawled = true;
                break;
            }
            // Push all new UTXOs into the state's UTXOs array
            for (const utxo of utxosByAddress.utxos) {
                this.state.utxos.push({
                    txid: utxo.txid,
                    amount: utxo.amount.baseAmount,
                    script: utxo.script,
                    n: utxo.n,
                });
            }
            // Check again if we now have enough
            if (this.createTransaction(feePerKb))
                break;
            // Increment the page so next time we fetch the next "page"
            this.state.page++;
        }
    }
    createTransaction(feePerKb) {
        // IMPROVE: Do not allow dust outputs
        const vins = this.state.utxos.map((utxo) => ({
            txid: hexToBytes(utxo.txid),
            index: utxo.n,
            witnessUtxo: {
                script: utxo.script,
                amount: BigInt(toSatoshi(toDecimal(utxo.amount.toString())).toString()),
            },
        }));
        const vouts = [
            {
                address: this.toLegacyAddress(this.toAddress),
                amount: BigInt(this.amount.minimalUnitAmount.toString()),
            },
        ];
        const selected = btc.selectUTXO(vins, vouts, 'default', {
            changeAddress: this.toLegacyAddress(this.fromAddress),
            feePerByte: BigInt(feePerKb.minimalUnitAmount.div(1000).round().toString()),
            bip69: true,
            createTx: true,
            allowLegacyWitnessUtxo: true,
            network: this.networkParams,
        });
        if (!selected)
            return null;
        return {
            vins: selected.inputs.map((input) => ({
                txid: bytesToHex(input.txid, false),
                amount: toBase(input.witnessUtxo.amount),
                n: input.index,
                script: input.witnessUtxo.script,
            })),
            vouts: selected.outputs.map((output) => {
                if (!('address' in output))
                    throw new Error();
                return {
                    amount: toBase(output.amount),
                    address: output.address,
                };
            }),
            feeBase: toBase(selected.fee),
        };
    }
}
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