@cloudant/cloudant/plugins/promises.js

Cloudant Node.js client

// Copyright © 2015, 2017 IBM Corp. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
'use strict';

// this the the 'promises' request handler.
// It is a function that returns a Promise and resolves the promise on success
// or rejects the Promise on failure

var nullcallback = function() {};

module.exports = function(options) {
  var requestDefaults = options.requestDefaults || {jar: false};
  var request = require('request').defaults(requestDefaults);
  var myrequest = function(req, callback) {
    if (typeof callback !== 'function') {
      callback = nullcallback;
    }
    return new Promise(function(resolve, reject) {
      request(req, function(err, h, b) {
        var statusCode = (h && h.statusCode) || 500;
        if (b) {
          try { b = JSON.parse(b); } catch (err) { }
        }
        if (statusCode >= 200 && statusCode < 400) {
          callback(null, h, b);
          return resolve(b);
        }
        if (b) {
          b.statusCode = statusCode;
        }
        reject(err || b);
        callback(err, h, b);
      });
    });
  };

  return myrequest;
};