From ad2eb5255343fde825b396406a3f5a14a9b769c2 Mon Sep 17 00:00:00 2001
From: Veloman Yunkan <veloman.yunkan@gmail.com>
Date: Sun, 28 Nov 2021 19:53:48 +0400
Subject: [PATCH] Thread safe dumping of the OPDS feed

---
 src/opds_dumper.cpp | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/opds_dumper.cpp b/src/opds_dumper.cpp
index 7d463f714..3570633c2 100644
--- a/src/opds_dumper.cpp
+++ b/src/opds_dumper.cpp
@@ -108,10 +108,15 @@ BooksData getBooksData(const Library* library, const std::vector<std::string>& b
 {
   BooksData booksData;
   for ( const auto& bookId : bookIds ) {
-    const Book& book = library->getBookById(bookId);
-    booksData.push_back(kainjow::mustache::object{
-        {"entry", getSingleBookEntryXML(book, false, endpointRoot, partial)}
-    });
+    try {
+      const Book book = library->getBookByIdThreadSafe(bookId);
+      booksData.push_back(kainjow::mustache::object{
+          {"entry", getSingleBookEntryXML(book, false, endpointRoot, partial)}
+      });
+    } catch ( const std::out_of_range& ) {
+      // the book was removed from the library since its id was obtained
+      // ignore it
+    }
   }
 
   return booksData;