1 files changed, 134 insertions, 0 deletions
diff --git a/node_modules/async/retry.js b/node_modules/async/retry.js
new file mode 100644
index 000000000..5ab0d118a
--- /dev/null
+++ b/node_modules/async/retry.js
@@ -0,0 +1,134 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = retry;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _constant = require('lodash/constant');
+
+var _constant2 = _interopRequireDefault(_constant);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Attempts to get a successful response from `task` no more than `times` times
+ * before returning an error. If the task is successful, the `callback` will be
+ * passed the result of the successful task. If all attempts fail, the callback
+ * will be passed the error and result (if any) of the final attempt.
+ *
+ * @name retry
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @category Control Flow
+ * @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
+ * object with `times` and `interval` or a number.
+ * * `times` - The number of attempts to make before giving up.  The default
+ *   is `5`.
+ * * `interval` - The time to wait between retries, in milliseconds.  The
+ *   default is `0`. The interval may also be specified as a function of the
+ *   retry count (see example).
+ * * If `opts` is a number, the number specifies the number of times to retry,
+ *   with the default interval of `0`.
+ * @param {Function} task - A function which receives two arguments: (1) a
+ * `callback(err, result)` which must be called when finished, passing `err`
+ * (which can be `null`) and the `result` of the function's execution, and (2)
+ * a `results` object, containing the results of the previously executed
+ * functions (if nested inside another control flow). Invoked with
+ * (callback, results).
+ * @param {Function} [callback] - An optional callback which is called when the
+ * task has succeeded, or after the final failed attempt. It receives the `err`
+ * and `result` arguments of the last attempt at completing the `task`. Invoked
+ * with (err, results).
+ * @example
+ *
+ * // The `retry` function can be used as a stand-alone control flow by passing
+ * // a callback, as shown below:
+ *
+ * // try calling apiMethod 3 times
+ * async.retry(3, apiMethod, function(err, result) {
+ *     // do something with the result
+ * });
+ *
+ * // try calling apiMethod 3 times, waiting 200 ms between each retry
+ * async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
+ *     // do something with the result
+ * });
+ *
+ * // try calling apiMethod 10 times with exponential backoff
+ * // (i.e. intervals of 100, 200, 400, 800, 1600, ... milliseconds)
+ * async.retry({
+ *   times: 10,
+ *   interval: function(retryCount) {
+ *     return 50 * Math.pow(2, retryCount);
+ *   }
+ * }, apiMethod, function(err, result) {
+ *     // do something with the result
+ * });
+ *
+ * // try calling apiMethod the default 5 times no delay between each retry
+ * async.retry(apiMethod, function(err, result) {
+ *     // do something with the result
+ * });
+ *
+ * // It can also be embedded within other control flow functions to retry
+ * // individual methods that are not as reliable, like this:
+ * async.auto({
+ *     users: api.getUsers.bind(api),
+ *     payments: async.retry(3, api.getPayments.bind(api))
+ * }, function(err, results) {
+ *     // do something with the results
+ * });
+ */
+function retry(opts, task, callback) {
+    var DEFAULT_TIMES = 5;
+    var DEFAULT_INTERVAL = 0;
+
+    var options = {
+        times: DEFAULT_TIMES,
+        intervalFunc: (0, _constant2.default)(DEFAULT_INTERVAL)
+    };
+
+    function parseTimes(acc, t) {
+        if (typeof t === 'object') {
+            acc.times = +t.times || DEFAULT_TIMES;
+
+            acc.intervalFunc = typeof t.interval === 'function' ? t.interval : (0, _constant2.default)(+t.interval || DEFAULT_INTERVAL);
+        } else if (typeof t === 'number' || typeof t === 'string') {
+            acc.times = +t || DEFAULT_TIMES;
+        } else {
+            throw new Error("Invalid arguments for async.retry");
+        }
+    }
+
+    if (arguments.length < 3 && typeof opts === 'function') {
+        callback = task || _noop2.default;
+        task = opts;
+    } else {
+        parseTimes(options, opts);
+        callback = callback || _noop2.default;
+    }
+
+    if (typeof task !== 'function') {
+        throw new Error("Invalid arguments for async.retry");
+    }
+
+    var attempt = 1;
+    function retryAttempt() {
+        task(function (err) {
+            if (err && attempt++ < options.times) {
+                setTimeout(retryAttempt, options.intervalFunc(attempt));
+            } else {
+                callback.apply(null, arguments);
+            }
+        });
+    }
+
+    retryAttempt();
+}
+module.exports = exports['default'];
+\ No newline at end of file