From 74d3272c373f7f0c55007f4fd3603155cef2cec4 Mon Sep 17 00:00:00 2001
From: Alex Cabal <alex@alexcabal.com>
Date: Thu, 20 Jan 2022 16:31:46 -0600
Subject: [PATCH] Better error handling if a user tries to get a book while the
 library cache is being rebuilt

---
 lib/Library.php | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib/Library.php b/lib/Library.php
index 8c393cd3..3eceb542 100644
--- a/lib/Library.php
+++ b/lib/Library.php
@@ -108,7 +108,21 @@ class Library{
 		}
 		catch(Safe\Exceptions\ApcuException $ex){
 			Library::RebuildCache();
-			$ebooks = apcu_fetch('ebooks');
+			try{
+				$ebooks = apcu_fetch('ebooks');
+			}
+			catch(Safe\Exceptions\ApcuException $ex){
+				// We can get here if the cache is currently rebuilding from a different process.
+				// Nothing we can do but wait, so wait 20 seconds before retrying
+				sleep(20);
+
+				try{
+					$ebooks = apcu_fetch('ebooks');
+				}
+				catch(Safe\Exceptions\ApcuException $ex){
+					// Cache STILL rebuilding... give up silently for now
+				}
+			}
 		}
 
 		return $ebooks;