From 353dcb4b6987c0bb8f726e86af1d39278b7e4dd9 Mon Sep 17 00:00:00 2001
From: Matthijs van Henten <mvhenten@amazon.com>
Date: Wed, 25 Oct 2017 22:51:44 +0000
Subject: [PATCH] throttle publishing

---
 node_modules/c9/throttle.js      |  18 +++++
 node_modules/c9/throttle_test.js | 135 +++++++++++++++++++++++++++++++
 2 files changed, 153 insertions(+)
 create mode 100644 node_modules/c9/throttle.js
 create mode 100644 node_modules/c9/throttle_test.js

diff --git a/node_modules/c9/throttle.js b/node_modules/c9/throttle.js
new file mode 100644
index 00000000..890ab1ee
--- /dev/null
+++ b/node_modules/c9/throttle.js
@@ -0,0 +1,18 @@
+/**
+ * Return a function that ensures callback is 
+ * not called more often ten once per tpms (times per ms)
+ */
+function throttle(tpms) {
+    var last = Date.now();
+    
+    return function(callback) {
+        var now = Date.now();
+        var delay = Math.max(0, last - now);
+        
+        last = now + delay + tpms;
+
+        setTimeout(callback, delay);
+    };
+}
+
+module.exports = throttle;
\ No newline at end of file
diff --git a/node_modules/c9/throttle_test.js b/node_modules/c9/throttle_test.js
new file mode 100644
index 00000000..b4cc6cd3
--- /dev/null
+++ b/node_modules/c9/throttle_test.js
@@ -0,0 +1,135 @@
+/*global describe it beforeEach afterEach*/
+"use strict";
+"use server";
+"use mocha";
+
+require("c9/inline-mocha")(module);
+
+var throttle = require("./throttle");
+var sinon = require("sinon");
+var assert = require("assert");
+var async = require("async");
+
+describe("urls", function() {
+
+    this.timeout(15000);
+
+    it("calls first invocation with no delay", function(done) {
+        var tpms = 10;
+        var throttler = throttle(tpms);
+
+        var start = Date.now();
+
+        throttler(function() {
+            var end = Date.now() - start;
+            assert.ok(end < tpms, "invocation was immediate");
+            done();
+        });
+    });
+
+    it("calls second invocation delayed by tpms", function(done) {
+        var tpms = 10;
+        var throttler = throttle(tpms);
+
+        var start = Date.now();
+        var first = sinon.stub();
+
+        throttler(first);
+
+        throttler(function() {
+            var end = Date.now() - start;
+            assert(first.calledOnce);
+            assert.ok(end >= tpms);
+            done();
+        });
+    });
+
+    it("calls third invocation delayed by 2 * tpms", function(done) {
+        var tpms = 10;
+        var throttler = throttle(tpms);
+
+        var start = Date.now();
+        var first = sinon.stub();
+        var second = sinon.stub();
+
+        throttler(first);
+        throttler(second);
+
+        throttler(function() {
+            var end = Date.now() - start;
+            assert(first.calledOnce);
+            assert(second.calledOnce);
+
+            assert.ok(end >= tpms * 2);
+            done();
+        });
+    });
+
+    it("does not delay after enough time has passed", function(done) {
+        var tpms = 10;
+        var throttler = throttle(tpms);
+
+        var first = sinon.stub();
+        var second = sinon.stub();
+
+        throttler(first);
+        throttler(second);
+
+        setTimeout(function() {
+            var start = Date.now();
+
+            assert(first.calledOnce);
+            assert(second.calledOnce);
+
+            throttler(function() {
+                var end = Date.now() - start;
+
+                assert.ok(end < tpms, "third call was not delayed at all");
+
+                done();
+            });
+        }, tpms * 3);
+
+    });
+
+    it("delays callback chains", function(done) {
+        var tpms = 30;
+        var throttler = throttle(tpms);
+
+        var start = Date.now();
+
+        async.each([1, 2, 3, 4], function(a, next) {
+            throttler(next);
+        }, function() {
+            var end = Date.now() - start;
+            assert.ok(end >= tpms * 3, "End result was delayed");
+            done();
+        });
+    });
+
+    it("delays a .series", function(done) {
+        var tpms = 30;
+        var throttler = throttle(tpms);
+
+        var start = Date.now();
+
+        async.series([
+            throttler,
+            throttler,
+            function(next) {
+                var end = Date.now() - start;
+                assert.ok(end >= tpms, "got delayed");
+                throttler(next);
+            }
+
+        ], function() {
+            var end = Date.now() - start;
+            assert.ok(end >= tpms * 2, "delayed 2 times");
+            done();
+        });
+
+    });
+
+
+
+});
\ No newline at end of file