From 87994fe0060ce90a9a1cd4dd67151c0c3929828d Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Thu, 24 Mar 2022 02:29:59 +0100
Subject: [PATCH] retry failed uploads with backoff

---
 copyparty/web/up2k.js | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/copyparty/web/up2k.js b/copyparty/web/up2k.js
index 33bfe4ff..e1ad5720 100644
--- a/copyparty/web/up2k.js
+++ b/copyparty/web/up2k.js
@@ -1173,7 +1173,7 @@ function up2k_init(subtle) {
         var t = st.todo.handshake[0],
             cd = t.cooldown;
 
-        if (cd && cd - Date.now() > 0)
+        if (cd && cd > Date.now())
             return false;
 
         // keepalive or verify
@@ -1370,6 +1370,14 @@ function up2k_init(subtle) {
         return taskerd;
     })();
 
+    function chill(t) {
+        var now = Date.now();
+        if ((t.coolmul || 0) < 2 || now - t.cooldown < t.coolmul * 700)
+            t.coolmul = Math.min((t.coolmul || 0.5) * 2, 32);
+
+        t.cooldown = Math.max(t.cooldown || 1, Date.now() + t.coolmul * 1000);
+    }
+
     /////
     ////
     ///   hashing
@@ -1756,8 +1764,12 @@ function up2k_init(subtle) {
 
                     pvis.move(t.n, 'ok');
                 }
-                else t.t_uploaded = undefined;
+                else {
+                    if (t.t_uploaded)
+                        chill(t);
 
+                    t.t_uploaded = undefined;
+                }
                 tasker();
             }
             else {
@@ -1869,7 +1881,8 @@ function up2k_init(subtle) {
             else {
                 toast.err(0, "server broke; cu-err {0} on file [{1}]:\n".format(
                     xhr.status, t.name) + (txt || "no further information"));
-                return;
+
+                chill(t);
             }
             orz2(xhr);
         }