From b46ec26ccdd4650e6e78b7f28233aec26c43ea0e Mon Sep 17 00:00:00 2001
From: Graeme Yeates <yeatesgraeme@gmail.com>
Date: Mon, 11 Jul 2016 19:56:34 -0400
Subject: #1226, make retry interval asynchronous

---
 lib/retry.js        | 44 ++++++++++----------------------------------
 mocha_test/retry.js | 16 ++++++++++++++++
 2 files changed, 26 insertions(+), 34 deletions(-)

diff --git a/lib/retry.js b/lib/retry.js
index 5c22af3..bf0dcf1 100644
--- a/lib/retry.js
+++ b/lib/retry.js
@@ -1,4 +1,3 @@
-import series from './series';
 import noop from 'lodash/noop';
 import constant from 'lodash/constant';
 
@@ -104,43 +103,20 @@ export default function retry(opts, task, callback) {
         callback = callback || noop;
     }
 
-
     if (typeof task !== 'function') {
         throw new Error("Invalid arguments for async.retry");
     }
 
-    var attempts = [];
-    for (var i = 1; i < options.times + 1; i++) {
-        var isFinalAttempt = (i == options.times);
-        attempts.push(retryAttempt(isFinalAttempt));
-        var interval = options.intervalFunc(i);
-        if (!isFinalAttempt && interval > 0) {
-            attempts.push(retryInterval(interval));
-        }
+    var attempt = 1;
+    function retryAttempt() {
+        task(function(err, result) {
+            if (err && attempt++ < options.times) {
+                setTimeout(retryAttempt, options.intervalFunc(attempt));
+            } else {
+                callback(err, result);
+            }
+        });
     }
 
-    series(attempts, function(done, data) {
-        data = data[data.length - 1];
-        callback(data.err, data.result);
-    });
-
-
-    function retryAttempt(isFinalAttempt) {
-        return function(seriesCallback) {
-            task(function(err, result) {
-                seriesCallback(!err || isFinalAttempt, {
-                    err: err,
-                    result: result
-                });
-            });
-        };
-    }
-
-    function retryInterval(interval) {
-        return function(seriesCallback) {
-            setTimeout(function() {
-                seriesCallback(null);
-            }, interval);
-        };
-    }
+    retryAttempt();
 }
diff --git a/mocha_test/retry.js b/mocha_test/retry.js
index 43a8f6f..cc24a29 100644
--- a/mocha_test/retry.js
+++ b/mocha_test/retry.js
@@ -120,4 +120,20 @@ describe("retry", function () {
             done();
         }, 50);
     });
+
+    it('retry does not precompute the intervals (#1226)',function(done) {
+        var callTimes = [];
+        function intervalFunc() {
+            callTimes.push(new Date().getTime());
+            return 100;
+        };
+        function fn(callback) {
+            callback({}); // respond with indexed values
+        }
+        async.retry({ times: 4, interval: intervalFunc}, fn, function(){
+            expect(callTimes[1] - callTimes[0]).to.be.above(99);
+            expect(callTimes[2] - callTimes[1]).to.be.above(99);
+            done();
+        });
+    });
 });
-- 
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