From 71b77f635956c2fcfb4b41ef32a5dd6ab18e2276 Mon Sep 17 00:00:00 2001
From: j <0x006A@0x2620.org>
Date: Sat, 21 Mar 2015 12:49:53 +0530
Subject: [PATCH] queue multiple cache requests

---
 static/js/fs.js | 59 +++++++++++++++++++++++++++++--------------------
 1 file changed, 35 insertions(+), 24 deletions(-)

diff --git a/static/js/fs.js b/static/js/fs.js
index 032cde1ee..1c2c7d346 100644
--- a/static/js/fs.js
+++ b/static/js/fs.js
@@ -6,6 +6,7 @@ pandora.fs = (function() {
             downloads: {},
             enabled: false,
         },
+        queue = [],
         requestedBytes = 100*1024*1024*1024; // 100GB
 
     if(window.webkitRequestFileSystem) {
@@ -40,32 +41,42 @@ pandora.fs = (function() {
             resolution: pandora.user.ui.videoResolution,
             size: 0
         };
-        pandora.api.get({id: id, keys: ['parts']}, function(result) {
-            var parts = result.data.parts, sizes = [];
-            downloadPart(0);
 
-            function downloadPart(part) {
-                that.downloadVideoURL(id, pandora.user.ui.videoResolution, part + 1, false, function(result) {
-                    result.progress = 1/parts * (part + result.progress);
-                    that.downloads[id].progress = result.progress;
-                    if (result.cancel) {
-                        that.downloads[id].cancel = result.cancel;
-                    }
-                    if (result.total) {
-                        sizes[part] = result.total;
-                        that.downloads[id].size = Ox.sum(sizes);
-                    }
-                    if (result.url) {
-                        if (part + 1 == parts) {
-                            delete that.downloads[id];
-                        } else {
-                            downloadPart(part + 1);
+        queue.length
+            ? queue.push([id, callback])
+            : startDownload(id, callback);
+
+        function startDownload(id, callback) {
+            pandora.api.get({id: id, keys: ['parts']}, function(result) {
+                var parts = result.data.parts, sizes = [];
+                downloadPart(0);
+
+                function downloadPart(part) {
+                    that.downloadVideoURL(id, pandora.user.ui.videoResolution, part + 1, false, function(result) {
+                        result.progress = 1/parts * (part + result.progress);
+                        that.downloads[id].progress = result.progress;
+                        if (result.cancel) {
+                            that.downloads[id].cancel = result.cancel;
                         }
-                    }
-                    callback && callback(result);
-                });
-            }
-        });
+                        if (result.total) {
+                            sizes[part] = result.total;
+                            that.downloads[id].size = Ox.sum(sizes);
+                        }
+                        if (result.url) {
+                            if (part + 1 == parts) {
+                                delete that.downloads[id];
+                                if (queue.length) {
+                                    startDownload.apply(null, queue.shift());
+                                }
+                            } else {
+                                downloadPart(part + 1);
+                            }
+                        }
+                        callback && callback(result);
+                    });
+                }
+            });
+        }
     };
 
     that.removeVideo = function(id, callback) {