@node-dlc/core
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<title>Code coverage report for lib/dlc/TxFinalizer.ts</title>
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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/dlc</a> TxFinalizer.ts</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">67.05% </span>
<span class="quiet">Statements</span>
<span class='fraction'>59/88</span>
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<div class='fl pad1y space-right2'>
<span class="strong">41.67% </span>
<span class="quiet">Branches</span>
<span class='fraction'>5/12</span>
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<div class='fl pad1y space-right2'>
<span class="strong">50% </span>
<span class="quiet">Functions</span>
<span class='fraction'>16/32</span>
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<div class='fl pad1y space-right2'>
<span class="strong">67.07% </span>
<span class="quiet">Lines</span>
<span class='fraction'>55/82</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { FundingInput, MessageType } from '@node-dlc/messaging';
import { Decimal } from 'decimal.js';
const BATCH_FUND_TX_BASE_WEIGHT = 42;
const FUNDING_OUTPUT_SIZE = 43;
export class DualFundingTxFinalizer {
constructor(
readonly offerInputs: FundingInput[],
readonly offerPayoutSPK: Buffer,
readonly offerChangeSPK: Buffer,
readonly acceptInputs: FundingInput[],
readonly acceptPayoutSPK: Buffer,
readonly acceptChangeSPK: Buffer,
readonly feeRate: bigint,
readonly numContracts = <span class="branch-0 cbranch-no" title="branch not covered" >1,</span>
) {}
private computeFees(
_inputs: FundingInput[],
payoutSPK: Buffer,
changeSPK: Buffer,
numContracts: number,
): IFees {
// If no inputs, return zero fees (matches C++ layer behavior for single-funded DLCs)
if (_inputs.length === 0) {
return { futureFee: BigInt(0), fundingFee: BigInt(0) };
}
_inputs.forEach((input) => {
<span class="missing-if-branch" title="if path not taken" >I</span>if (input.type !== MessageType.FundingInput) {
<span class="cstat-no" title="statement not covered" > console.error('input', input);</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Input is not a funding input');</span>
}
});
const inputs: FundingInput[] = _inputs.map(
(input) => input as FundingInput,
);
// https://github.com/discreetlogcontracts/dlcspecs/blob/8ee4bbe816c9881c832b1ce320b9f14c72e3506f/Transactions.md#expected-weight-of-the-contract-execution-or-refund-transaction
const futureFeeWeight = 249 + 4 * payoutSPK.length;
const futureFeeVBytes = new Decimal(futureFeeWeight)
.times(numContracts)
.div(4)
.ceil()
.toNumber();
const futureFee = this.feeRate * BigInt(futureFeeVBytes);
// https://github.com/discreetlogcontracts/dlcspecs/blob/8ee4bbe816c9881c832b1ce320b9f14c72e3506f/Transactions.md#expected-weight-of-the-funding-transaction
const inputWeight = inputs.reduce((total, input) => {
return total + 164 + input.maxWitnessLen + input.scriptSigLength();
}, 0);
const contractWeight =
(BATCH_FUND_TX_BASE_WEIGHT + FUNDING_OUTPUT_SIZE * numContracts * 4) / 2;
const outputWeight = 36 + 4 * changeSPK.length + contractWeight;
const weight = outputWeight + inputWeight;
const vbytes = new Decimal(weight).div(4).ceil().toNumber();
const fundingFee = this.feeRate * BigInt(vbytes);
return { futureFee, fundingFee };
}
private getOfferFees(): IFees {
return this.computeFees(
this.offerInputs,
this.offerPayoutSPK,
this.offerChangeSPK,
this.numContracts,
);
}
private getAcceptFees(): IFees {
return this.computeFees(
this.acceptInputs,
this.acceptPayoutSPK,
this.acceptChangeSPK,
this.numContracts,
);
}
public get offerFees(): bigint {
const { futureFee, fundingFee } = this.getOfferFees();
return futureFee + fundingFee;
}
public get offerFutureFee(): bigint {
return this.getOfferFees().futureFee;
}
public get offerFundingFee(): bigint {
return this.getOfferFees().fundingFee;
}
public get acceptFees(): bigint {
const { futureFee, fundingFee } = this.getAcceptFees();
return futureFee + fundingFee;
}
public get acceptFutureFee(): bigint {
return this.getAcceptFees().futureFee;
}
<span class="fstat-no" title="function not covered" > public get a</span>cceptFundingFee(): bigint {
<span class="cstat-no" title="statement not covered" > return this.getAcceptFees().fundingFee;</span>
}
}
export class DualClosingTxFinalizer {
<span class="fstat-no" title="function not covered" > constructor(</span>
readonly <span class="cstat-no" title="statement not covered" >initiatorInputs: FundingInput[],</span>
readonly <span class="cstat-no" title="statement not covered" >offerPayoutSPK: Buffer,</span>
readonly <span class="cstat-no" title="statement not covered" >acceptPayoutSPK: Buffer,</span>
readonly <span class="cstat-no" title="statement not covered" >feeRate: bigint,</span>
) {}
private <span class="fstat-no" title="function not covered" >computeFees(</span>payoutSPK: Buffer, _inputs: FundingInput[] = <span class="branch-0 cbranch-no" title="branch not covered" >[])</span>: bigint {
<span class="cstat-no" title="statement not covered" > _inputs.forEach(<span class="fstat-no" title="function not covered" >(i</span>nput) => {</span>
<span class="cstat-no" title="statement not covered" > if (input.type !== MessageType.FundingInput)</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Input is not a funding input');</span>
});
const inputs: FundingInput[] = <span class="cstat-no" title="statement not covered" >_inputs.map(</span>
<span class="fstat-no" title="function not covered" > (i</span>nput) => <span class="cstat-no" title="statement not covered" >input as FundingInput,</span>
);
// https://gist.github.com/matthewjablack/08c36baa513af9377508111405b22e03
const inputWeight = <span class="cstat-no" title="statement not covered" >inputs.reduce(<span class="fstat-no" title="function not covered" >(t</span>otal, input) => {</span>
<span class="cstat-no" title="statement not covered" > return total + 164 + input.maxWitnessLen + input.scriptSigLength();</span>
}, 0);
const outputWeight = <span class="cstat-no" title="statement not covered" >36 + 4 * payoutSPK.length;</span>
const weight = <span class="cstat-no" title="statement not covered" >213 + outputWeight + inputWeight;</span>
const vbytes = <span class="cstat-no" title="statement not covered" >new Decimal(weight).div(4).ceil().toNumber();</span>
const fee = <span class="cstat-no" title="statement not covered" >this.feeRate * BigInt(vbytes);</span>
<span class="cstat-no" title="statement not covered" > return fee;</span>
}
private <span class="fstat-no" title="function not covered" >getOfferInitiatorFees(</span>): bigint {
<span class="cstat-no" title="statement not covered" > return this.computeFees(this.offerPayoutSPK, this.initiatorInputs);</span>
}
private <span class="fstat-no" title="function not covered" >getOfferReciprocatorFees(</span>): bigint {
<span class="cstat-no" title="statement not covered" > return this.computeFees(this.offerPayoutSPK);</span>
}
private <span class="fstat-no" title="function not covered" >getAcceptInitiatorFees(</span>): bigint {
<span class="cstat-no" title="statement not covered" > return this.computeFees(this.acceptPayoutSPK, this.initiatorInputs);</span>
}
private <span class="fstat-no" title="function not covered" >getAcceptReciprocatorFees(</span>): bigint {
<span class="cstat-no" title="statement not covered" > return this.computeFees(this.acceptPayoutSPK);</span>
}
<span class="fstat-no" title="function not covered" > public get o</span>fferInitiatorFees(): bigint {
<span class="cstat-no" title="statement not covered" > return this.getOfferInitiatorFees();</span>
}
<span class="fstat-no" title="function not covered" > public get o</span>fferReciprocatorFees(): bigint {
<span class="cstat-no" title="statement not covered" > return this.getOfferReciprocatorFees();</span>
}
<span class="fstat-no" title="function not covered" > public get a</span>cceptInitiatorFees(): bigint {
<span class="cstat-no" title="statement not covered" > return this.getAcceptInitiatorFees();</span>
}
<span class="fstat-no" title="function not covered" > public get a</span>cceptReciprocatorFees(): bigint {
<span class="cstat-no" title="statement not covered" > return this.getAcceptReciprocatorFees();</span>
}
}
interface IFees {
futureFee: bigint;
fundingFee: bigint;
}
export const getFinalizer = (
feeRate: bigint,
offerInputs?: FundingInput[],
acceptInputs?: FundingInput[],
numContracts?: number,
): DualFundingTxFinalizer => {
const input = new FundingInput();
input.maxWitnessLen = 108;
input.redeemScript = Buffer.from('', 'hex');
const fakeSPK = Buffer.from(
'0014663117d27e78eb432505180654e603acb30e8a4a',
'hex',
);
offerInputs = offerInputs || <span class="branch-1 cbranch-no" title="branch not covered" >Array.from({ length: 1 }, <span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >input)</span>;</span>
acceptInputs = acceptInputs || <span class="branch-1 cbranch-no" title="branch not covered" >Array.from({ length: 1 }, <span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >input)</span>;</span>
return new DualFundingTxFinalizer(
offerInputs,
fakeSPK,
fakeSPK,
acceptInputs,
fakeSPK,
fakeSPK,
feeRate,
numContracts,
);
};
export const getFinalizerByCount = (
feeRate: bigint,
numOfferInputs: number,
numAcceptInputs: number,
numContracts: number,
): DualFundingTxFinalizer => {
const input = new FundingInput();
input.maxWitnessLen = 108;
input.redeemScript = Buffer.from('', 'hex');
const offerInputs = Array.from({ length: numOfferInputs }, () => input);
const acceptInputs = Array.from({ length: numAcceptInputs }, () => input);
return getFinalizer(feeRate, offerInputs, acceptInputs, numContracts);
};
</pre></td></tr></table></pre>
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