From 495c9850b486c79a6b5cbd272554c0718d2b285e Mon Sep 17 00:00:00 2001
From: Stypox <stypox@pm.me>
Date: Wed, 20 Dec 2023 23:57:43 +0100
Subject: [PATCH] Fix transaction too large for channel tab fragments

---
 .../list/channel/ChannelTabFragment.java      | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelTabFragment.java b/app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelTabFragment.java
index 8712ab4d914..76849d94d70 100644
--- a/app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelTabFragment.java
+++ b/app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelTabFragment.java
@@ -1,6 +1,7 @@
 package org.schabi.newpipe.fragments.list.channel;
 
 import android.os.Bundle;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -14,7 +15,9 @@
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.channel.tabs.ChannelTabInfo;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
+import org.schabi.newpipe.extractor.linkhandler.ReadyChannelTabListLinkHandler;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.fragments.list.BaseListInfoFragment;
 import org.schabi.newpipe.fragments.list.playlist.PlaylistControlViewHolder;
@@ -114,6 +117,27 @@ public void setTitle(final String title) {
     public void handleResult(@NonNull final ChannelTabInfo result) {
         super.handleResult(result);
 
+        // FIXME this is a really hacky workaround, to avoid storing useless data in the fragment
+        //  state. The problem is, `ReadyChannelTabListLinkHandler` might contain raw JSON data that
+        //  uses a lot of memory (e.g. ~800KB for YouTube). While 800KB doesn't seem much, if
+        //  you combine just a couple of channel tab fragments you easily go over the 1MB
+        //  save&restore transaction limit, and get `TransactionTooLargeException`s. A proper
+        //  solution would require rethinking about `ReadyChannelTabListLinkHandler`s.
+        if (tabHandler instanceof ReadyChannelTabListLinkHandler) {
+            try {
+                // once `handleResult` is called, the parsed data was already saved to cache, so
+                // we can discard any raw data in ReadyChannelTabListLinkHandler and create a
+                // link handler with identical properties, but without any raw data
+                tabHandler = result.getService()
+                        .getChannelTabLHFactory()
+                        .fromQuery(tabHandler.getId(), tabHandler.getContentFilters(),
+                                tabHandler.getSortFilter());
+            } catch (final ParsingException e) {
+                // silently ignore the error, as the app can continue to function normally
+                Log.w(TAG, "Could not recreate channel tab handler", e);
+            }
+        }
+
         if (playlistControlBinding != null) {
             // PlaylistControls should be visible only if there is some item in
             // infoListAdapter other than header