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Текущая директория: /opt/BitGoJS/node_modules/stellar-base/lib

Просмотр файла: get_liquidity_pool_id.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.LiquidityPoolFeeV18 = undefined;
exports.getLiquidityPoolId = getLiquidityPoolId;

var _xdr = require('./xdr');

var _xdr2 = _interopRequireDefault(_xdr);

var _asset = require('./asset');

var _hashing = require('./hashing');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

// LiquidityPoolFeeV18 is the default liquidity pool fee in protocol v18. It defaults to 30 base points (0.3%).
var LiquidityPoolFeeV18 = exports.LiquidityPoolFeeV18 = 30;

/**
 * getLiquidityPoolId computes the Pool ID for the given assets, fee and pool type.
 *
 * @see [stellar-core getPoolID](https://github.com/stellar/stellar-core/blob/9f3a48c6a8f1aa77b6043a055d0638661f718080/src/ledger/test/LedgerTxnTests.cpp#L3746-L3751)
 *
 * @export
 * @param {string} liquidityPoolType – A string representing the liquidity pool type.
 * @param {object} liquidityPoolParameters        – The liquidity pool parameters.
 * @param {Asset}  liquidityPoolParameters.assetA – The first asset in the Pool, it must respect the rule assetA < assetB.
 * @param {Asset}  liquidityPoolParameters.assetB – The second asset in the Pool, it must respect the rule assetA < assetB.
 * @param {number} liquidityPoolParameters.fee    – The liquidity pool fee. For now the only fee supported is `30`.
 *
 * @return {Buffer} the raw Pool ID buffer, which can be stringfied with `toString('hex')`
 */
function getLiquidityPoolId(liquidityPoolType) {
  var liquidityPoolParameters = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

  if (liquidityPoolType !== 'constant_product') {
    throw new Error('liquidityPoolType is invalid');
  }

  var assetA = liquidityPoolParameters.assetA,
      assetB = liquidityPoolParameters.assetB,
      fee = liquidityPoolParameters.fee;

  if (!assetA || !(assetA instanceof _asset.Asset)) {
    throw new Error('assetA is invalid');
  }
  if (!assetB || !(assetB instanceof _asset.Asset)) {
    throw new Error('assetB is invalid');
  }
  if (!fee || fee !== LiquidityPoolFeeV18) {
    throw new Error('fee is invalid');
  }

  if (_asset.Asset.compare(assetA, assetB) !== -1) {
    throw new Error('Assets are not in lexicographic order');
  }

  var lpTypeData = _xdr2.default.LiquidityPoolType.liquidityPoolConstantProduct().toXDR();
  var lpParamsData = new _xdr2.default.LiquidityPoolConstantProductParameters({
    assetA: assetA.toXDRObject(),
    assetB: assetB.toXDRObject(),
    fee: fee
  }).toXDR();
  var payload = Buffer.concat([lpTypeData, lpParamsData]);
  return (0, _hashing.hash)(payload);
}

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