@trezor/utxo-lib/lib/coinselect/tryconfirmed.js

Client-side Bitcoin-like JavaScript library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.tryConfirmed = tryConfirmed;
const coinselectUtils_1 = require("./coinselectUtils");
function filterUtxos(utxos, minConfOwn, minConfOther) {
  const usable = [];
  const unusable = [];
  for (let i = 0; i < utxos.length; i++) {
    const utxo = utxos[i];
    const isUsed = utxo.own ? utxo.confirmations >= minConfOwn : utxo.confirmations >= minConfOther;
    if (isUsed || utxo.required) {
      usable.push(utxo);
    } else {
      unusable.push(utxo);
    }
  }
  return {
    usable,
    unusable
  };
}
function tryConfirmed(algorithm, options) {
  const own = options.own || 1;
  const other = options.other || 6;
  const coinbase = options.coinbase || coinselectUtils_1.MINIMAL_COINBASE_CONFIRMATIONS;
  return (utxosO, outputs, feeRate, optionsIn) => {
    const utxos = (0, coinselectUtils_1.filterCoinbase)(utxosO, coinbase);
    if (utxos.length === 0) {
      return {
        fee: 0
      };
    }
    const trials = [];
    let i;
    for (i = own; i > 0; i--) {
      trials.push({
        other,
        own: i
      });
    }
    for (i = other - 1; i > 0; i--) {
      trials.push({
        other: i,
        own: 1
      });
    }
    trials.push({
      other: 1,
      own: 0
    });
    trials.push({
      other: 0,
      own: 0
    });
    let unusable = utxos;
    let usable = [];
    for (i = 0; i < trials.length; i++) {
      const trial = trials[i];
      const filterResult = filterUtxos(unusable, trial.own, trial.other);
      if (filterResult.usable.length > 0) {
        usable = usable.concat(filterResult.usable);
        const unusableH = filterResult.unusable;
        unusable = unusableH;
        const result = algorithm(usable, outputs, feeRate, optionsIn);
        if (result.inputs) {
          return result;
        }
        if (unusable.length === 0) {
          return result;
        }
      }
    }
    throw new Error('Unexpected unreturned result');
  };
}
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