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

100% Statements 106/106
100% Branches 56/56
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100% Lines 105/105

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     '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) -> Boolean
       */
      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;
        }

        if (this.retryStrategy(err, response, body) && 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 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];
    });