@polkadot/api-provider/mock/mocks.js

'use strict';

var _values = require('babel-runtime/core-js/object/values');

var _values2 = _interopRequireDefault(_values);

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

var BN = require('bn.js'); // Copyright 2017-2018 Jaco Greeff
// This software may be modified and distributed under the terms
// of the ISC license. See the LICENSE file for details.


var headerEncode = require('@polkadot/primitives-json/header/encode');
var bnToU8a = require('@polkadot/util/bn/toU8a');
var randomAsU8a = require('@polkadot/util-crypto/random/asU8a');

function makeBlockHeader(prevNumber) {
  var blockNumber = prevNumber.addn(1);

  return {
    digest: {
      logs: []
    },
    extrinsicsRoot: randomAsU8a(),
    number: blockNumber,
    parentHash: prevNumber.eqn(-1) ? new Uint8Array(32) : bnToU8a(prevNumber, 256),
    stateRoot: bnToU8a(blockNumber, 256)
  };
}

module.exports = function mocks(_ref) {
  var subscriptions = _ref.subscriptions;

  var newHead = makeBlockHeader(new BN(-1));

  var updateSubs = function updateSubs(method, value) {
    subscriptions[method].lastValue = value;

    (0, _values2.default)(subscriptions[method].callbacks).forEach(function (cb) {
      try {
        // flowlint-next-line unclear-type:off
        cb(null, value);
      } catch (error) {
        console.error('Error on \'' + method + '\' subscription', error);
      }
    });
  };

  setInterval(function () {
    newHead = makeBlockHeader(newHead.number);

    updateSubs('subscribe_newHead', headerEncode(newHead));
  }, 5000);
};