@polkadot/api-provider/coder/json/decodeResponse.js

Transport providers for the API

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = decodeResponse;

var _assert = _interopRequireDefault(require("@polkadot/util/assert"));

var _number = _interopRequireDefault(require("@polkadot/util/is/number"));

var _undefined = _interopRequireDefault(require("@polkadot/util/is/undefined"));

// Copyright 2017-2018 @polkadot/api-provider authors & contributors
// This software may be modified and distributed under the terms
// of the ISC license. See the LICENSE file for details.
function checkError(error) {
  if (!error) {
    return;
  }

  const code = error.code,
        message = error.message;
  throw new Error(`[${code}]: ${message}`);
}

function decodeResponse(self, response) {
  (0, _assert.default)(response, 'Empty response object received');
  (0, _assert.default)(response.jsonrpc === '2.0', 'Invalid jsonrpc field in decoded object');
  const isSubscription = !(0, _undefined.default)(response.params) && !(0, _undefined.default)(response.method);
  (0, _assert.default)((0, _number.default)(response.id) || isSubscription && (0, _number.default)(response.params.subscription), 'Invalid id field in decoded object');
  checkError(response.error);
  (0, _assert.default)(!(0, _undefined.default)(response.result) || isSubscription, 'No result found in JsonRpc response');

  if (isSubscription) {
    checkError(response.params.error);
    return response.params.result;
  }

  return response.result;
}