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Текущая директория: /opt/BitGoJS/modules/utxo-core/dist/src/descriptor
Просмотр файла: VirtualSize.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getInputVSizesForDescriptors = getInputVSizesForDescriptors;
exports.getChangeOutputVSizesForDescriptor = getChangeOutputVSizesForDescriptor;
exports.getVirtualSize = getVirtualSize;
exports.getVirtualSizeEstimateForPsbt = getVirtualSizeEstimateForPsbt;
const unspents_1 = require("@bitgo/unspents");
const wasm_miniscript_1 = require("@bitgo/wasm-miniscript");
const psbt_1 = require("./psbt");
function getScriptPubKeyLength(descType) {
// See https://bitcoinops.org/en/tools/calc-size/
switch (descType) {
case 'Wpkh':
// https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wpkh
return 22;
case 'Sh':
case 'ShWsh':
case 'ShWpkh':
// https://github.com/bitcoin/bips/blob/master/bip-0016.mediawiki#specification
return 23;
case 'Pkh':
return 25;
case 'Wsh':
case 'Tr':
// P2WSH: https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#p2wsh
// P2TR: https://github.com/bitcoin/bips/blob/58ffd93812ff25e87d53d1f202fbb389fdfb85bb/bip-0341.mediawiki#script-validation-rules
// > A Taproot output is a native SegWit output (see BIP141) with version number 1, and a 32-byte witness program.
// 32 bytes for the hash, 1 byte for the version, 1 byte for the push opcode
return 34;
case 'Bare':
throw new Error('cannot determine scriptPubKey length for Bare descriptor');
default:
throw new Error('unexpected descriptor type ' + descType);
}
}
function getInputVSizeForDescriptor(descriptor) {
// FIXME(BTC-1489): this can overestimate the size of the input significantly
const maxWeight = descriptor.maxWeightToSatisfy();
const maxVSize = Math.ceil(maxWeight / 4);
const sizeOpPushdata1 = 1;
const sizeOpPushdata2 = 2;
return (
// inputId
32 +
// vOut
4 +
// nSequence
4 +
// script overhead
(maxVSize < 255 ? sizeOpPushdata1 : sizeOpPushdata2) +
// script
maxVSize);
}
function getInputVSizesForDescriptors(descriptors) {
return Object.fromEntries(Array.from(descriptors.entries()).map(([name, d]) => {
return [name, getInputVSizeForDescriptor(d)];
}));
}
function getChangeOutputVSizesForDescriptor(d) {
return {
inputVSize: getInputVSizeForDescriptor(d),
outputVSize: getScriptPubKeyLength(d.descType()),
};
}
function getVirtualSize(tx, descriptorMap) {
const lookup = descriptorMap ? getInputVSizesForDescriptors(descriptorMap) : undefined;
const inputVSize = tx.inputs.reduce((sum, input) => {
if (input instanceof wasm_miniscript_1.Descriptor) {
return sum + getInputVSizeForDescriptor(input);
}
if ('descriptorName' in input) {
if (!lookup) {
throw new Error('missing descriptorMap');
}
const vsize = lookup[input.descriptorName];
if (!vsize) {
throw new Error(`Could not find descriptor ${input.descriptorName}`);
}
return sum + vsize;
}
throw new Error('unexpected input');
}, 0);
const outputVSize = tx.outputs.reduce((sum, o) => {
return sum + unspents_1.Dimensions.getVSizeForOutputWithScriptLength(o.script.length);
}, 0);
// we will just assume that we have at least one segwit input
return inputVSize + outputVSize + unspents_1.VirtualSizes.txSegOverheadVSize;
}
function getVirtualSizeEstimateForPsbt(psbt, descriptorMap) {
const inputs = psbt.data.inputs.map((i) => {
const result = (0, psbt_1.findDescriptorForInput)(i, descriptorMap);
if (!result) {
throw new Error('Could not find descriptor for input');
}
return result.descriptor;
});
const outputs = psbt.txOutputs.map((o) => ({ script: o.script }));
return getVirtualSize({ inputs, outputs });
}
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sizeOpPushdata1 : sizeOpPushdata2) +\n    // script\n    maxVSize\n  );\n}\n\nexport function getInputVSizesForDescriptors(descriptors: DescriptorMap): Record<string, number> {\n  return Object.fromEntries(\n    Array.from(descriptors.entries()).map(([name, d]) => {\n      return [name, getInputVSizeForDescriptor(d)];\n    })\n  );\n}\n\nexport function getChangeOutputVSizesForDescriptor(d: Descriptor): {\n  inputVSize: number;\n  outputVSize: number;\n} {\n  return {\n    inputVSize: getInputVSizeForDescriptor(d),\n    outputVSize: getScriptPubKeyLength(d.descType()),\n  };\n}\n\ntype InputWithDescriptorName = { descriptorName: string };\ntype OutputWithScript = { script: Buffer };\n\ntype Tx<TInput> = {\n  inputs: TInput[];\n  outputs: OutputWithScript[];\n};\n\nexport function getVirtualSize(tx: Tx<Descriptor>): number;\nexport function getVirtualSize(tx: Tx<InputWithDescriptorName>, descriptors: DescriptorMap): number;\nexport function getVirtualSize(\n  tx: Tx<Descriptor> | Tx<InputWithDescriptorName>,\n  descriptorMap?: DescriptorMap\n): number {\n  const lookup = descriptorMap ? getInputVSizesForDescriptors(descriptorMap) : undefined;\n  const inputVSize = tx.inputs.reduce((sum, input) => {\n    if (input instanceof Descriptor) {\n      return sum + getInputVSizeForDescriptor(input);\n    }\n    if ('descriptorName' in input) {\n      if (!lookup) {\n        throw new Error('missing descriptorMap');\n      }\n      const vsize = lookup[input.descriptorName];\n      if (!vsize) {\n        throw new Error(`Could not find descriptor ${input.descriptorName}`);\n      }\n      return sum + vsize;\n    }\n    throw new Error('unexpected input');\n  }, 0);\n  const outputVSize = tx.outputs.reduce((sum, o) => {\n    return sum + Dimensions.getVSizeForOutputWithScriptLength(o.script.length);\n  }, 0);\n  // we will just assume that we have at least one segwit input\n  return inputVSize + outputVSize + VirtualSizes.txSegOverheadVSize;\n}\n\nexport function getVirtualSizeEstimateForPsbt(psbt: utxolib.Psbt, descriptorMap: DescriptorMap): number {\n  const inputs = psbt.data.inputs.map((i) => {\n    const result = findDescriptorForInput(i, descriptorMap);\n    if (!result) {\n      throw new Error('Could not find descriptor for input');\n    }\n    return result.descriptor;\n  });\n  const outputs = psbt.txOutputs.map((o) => ({ script: o.script }));\n  return getVirtualSize({ inputs, outputs });\n}\n"]}Выполнить команду
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