# All files / node-request-retry index.js

100% Statements 111/111
100% Branches 60/60
100% Functions 23/23
100% Lines 110/110

Press n or j to go to the next uncovered block, b, p or k for the previous block.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254

    1x
    1x
    1x
    1x
    1x

    1x

    13x

    21x
    21x

    21x

    43x

    6x
    2x

    6x
    2x

    6x

    43x
    37x
    19x

    37x

    43x
    43x
    43x
    43x

    43x

    43x

    43x

    43x
    43x

    43x

    43x
    21x

    43x
    44x
    22x

    22x
    3x

    19x
    19x

    1x

    1x
    53x
    53x

    53x
    51x
    47x

    51x
    4x

    51x
    51x
    6x
    3x

    6x

    51x
    10x
    10x

    41x

    1x
    3x
    2x

    3x
    3x

    1x
    10x
    2x

    1x
    5x
    21x
    1x

    20x

    43x
    43x
    43x
    43x

    54x

    10x

    6x
    2x

    6x
    2x

    6x

    10x
    4x
    2x

    4x

    10x
    10x

    8x
    6x
    2x

    6x

    8x
    2x

    8x
    8x

    8x
    48x

    8x

    8x
    16x

    8x

    1x

    1x
    1x
    1x

    1x
    6x

    1x

    1x
    2x

     'use strict';

    /*
     * Request
     *
     * Copyright(c) 2014 Francois-Guillaume Ribreau <npm@fgribreau.com>
     * MIT Licensed
     *
     */
    var extend = require('extend');
    var when = require('when');
    var request = require('request');
    var RetryStrategies = require('./strategies');
    var _ = require('lodash');

    var DEFAULTS = {
      maxAttempts: 5, // try 5 times
      retryDelay: 5000, // wait for 5s before trying again
      fullResponse: true, // resolve promise with the full response object
      promiseFactory: defaultPromiseFactory // Function to use a different promise implementation library
    };

    // Default promise factory which use bluebird
    function defaultPromiseFactory(resolver) {
      return when.promise(resolver);
    }

    /**
     * It calls the promiseFactory function passing it the resolver for the promise
     *
     * @param {Object} requestInstance - The Request Retry instance
     * @param {Function} promiseFactoryFn - The Request Retry instance
     * @return {Object} - The promise instance
     */
    function makePromise(requestInstance, promiseFactoryFn) {

      // Resolver function wich assigns the promise (resolve, reject) functions
      // to the requestInstance
      function Resolver(resolve, reject) {
        this._resolve = resolve;
        this._reject = reject;
      }

      return promiseFactoryFn(Resolver.bind(requestInstance));
    }

    function Request(url, options, f, retryConfig) {
      // ('url')
      if(_.isString(url)){
        // ('url', f)
        if(_.isFunction(options)){
          f = options;
        }

        if(!_.isObject(options)){
          options = {};
        }

        // ('url', {object})
        options.url = url;
      }

      if(_.isObject(url)){
        if(_.isFunction(options)){
          f = options;
        }
        options = url;
      }

      this.maxAttempts = retryConfig.maxAttempts;
      this.retryDelay = retryConfig.retryDelay;
      this.fullResponse = retryConfig.fullResponse;
      this.attempts = 0;

      /**
       * Option object
       * @type {Object}
       */
      this.options = options;

      /**
       * Return true if the request should be retried
       * @type {Function} (err, response, body, options) -> [Boolean, Object (optional)]
       */
      this.retryStrategy = _.isFunction(options.retryStrategy) ? options.retryStrategy : RetryStrategies.HTTPOrNetworkError;

      /**
       * Return a number representing how long request-retry should wait before trying again the request
       * @type {Boolean} (err, response, body) -> Number
       */
      this.delayStrategy = _.isFunction(options.delayStrategy) ? options.delayStrategy : function() { return this.retryDelay; };

      this._timeout = null;
      this._req = null;

      this._callback = _.isFunction(f) ? _.once(f) : null;

      // create the promise only when no callback was provided
      if (!this._callback) {
        this._promise = makePromise(this, retryConfig.promiseFactory);
      }

      this.reply = function requestRetryReply(err, response, body) {
        if (this._callback) {
          return this._callback(err, response, body);
        }

        if (err) {
          return this._reject(err);
        }

        // resolve with the full response or just the body
        response = this.fullResponse ? response : body;
        this._resolve(response);
      };
    }

    Request.request = request;

    Request.prototype._tryUntilFail = function () {
      this.maxAttempts--;
      this.attempts++;

      this._req = Request.request(this.options, function (err, response, body) {
        if (response) {
          response.attempts = this.attempts;
        }

        if (err) {
          err.attempts = this.attempts;
        }

        var mustRetry = this.retryStrategy(err, response, body, _.cloneDeep(this.options));
        if (_.isObject(mustRetry)) {
          if (_.isObject(mustRetry.options)) {
            this.options = mustRetry.options; //if retryStrategy supposes different request options for retry
          }
          mustRetry = mustRetry.mustRetry;
        }

        if (mustRetry && this.maxAttempts > 0) {
          this._timeout = setTimeout(this._tryUntilFail.bind(this), this.delayStrategy.call(this, err, response, body));
          return;
        }

        this.reply(err, response, body);
      }.bind(this));
    };

    Request.prototype.abort = function () {
      if (this._req) {
        this._req.abort();
      }
      clearTimeout(this._timeout);
      this.reply(new Error('Aborted'));
    };

    // expose request methods from RequestRetry
    ['end', 'on', 'emit', 'once', 'setMaxListeners', 'start', 'removeListener', 'pipe', 'write', 'auth'].forEach(function (requestMethod) {
      Request.prototype[requestMethod] = function exposedRequestMethod () {
        return this._req[requestMethod].apply(this._req, arguments);
      };
    });

    // expose promise methods
    ['then', 'catch', 'finally', 'fail', 'done'].forEach(function (promiseMethod) {
      Request.prototype[promiseMethod] = function exposedPromiseMethod () {
        if (this._callback) {
          throw new Error('A callback was provided but waiting a promise, use only one pattern');
        }
        return this._promise[promiseMethod].apply(this._promise, arguments);
      };
    });

    function Factory(url, options, f) {
      var retryConfig = _.chain(_.isObject(url) ? url : options || {}).defaults(DEFAULTS).pick(Object.keys(DEFAULTS)).value();
      var req = new Factory.Request(url, options, f, retryConfig);
      req._tryUntilFail();
      return req;
    }

    // adds a helper for HTTP method `verb` to object `obj`
    function makeHelper(obj, verb) {
      obj[verb] = function helper(url, options, f) {
        // ('url')
        if(_.isString(url)){
          // ('url', f)
          if(_.isFunction(options)){
            f = options;
          }

          if(!_.isObject(options)){
            options = {};
          }

          // ('url', {object})
          options.url = url;
        }

        if(_.isObject(url)){
          if(_.isFunction(options)){
            f = options;
          }
          options = url;
        }

        options.method = verb.toUpperCase();
        return obj(options, f);
      };
    }

    function defaults(defaultOptions, defaultF) {
      var factory = function (options, f) {
        if (typeof options === "string") {
          options = { uri: options };
        }
        return Factory.apply(null, [ extend(true, {}, defaultOptions, options), f || defaultF ]);
      };

      factory.defaults = function (newDefaultOptions, newDefaultF) {
        return defaults.apply(null, [ extend(true, {}, defaultOptions, newDefaultOptions), newDefaultF || defaultF ]);
      };

      factory.Request = Request;
      factory.RetryStrategies = RetryStrategies;

      ['get', 'head', 'post', 'put', 'patch', 'delete'].forEach(function (verb) {
        makeHelper(factory, verb);
      });
      factory.del = factory['delete'];

      ['jar', 'cookie'].forEach(function (method) {
        factory[method] = factory.Request.request[method];
      });

      return factory;
    }

    module.exports = Factory;

    Factory.defaults = defaults;
    Factory.Request = Request;
    Factory.RetryStrategies = RetryStrategies;

    // define .get/.post/... helpers
    ['get', 'head', 'post', 'put', 'patch', 'delete'].forEach(function (verb) {
      makeHelper(Factory, verb);
    });
    Factory.del = Factory['delete'];

    ['jar', 'cookie'].forEach(function (method) {
      Factory[method] = Factory.Request.request[method];
    });