thumbs: be more careful with invalid cache entries

1 files changed, 19 insertions, 1 deletions

diff --git a/src/gen-thumbs.js b/src/gen-thumbs.js
index f0eb72a..cecedc8 100644
--- a/src/gen-thumbs.js
+++ b/src/gen-thumbs.js
@@ -397,7 +397,18 @@ export function getDimensionsOfImagePath(mediaPath, cache) {
     throw new Error(`Expected mediaPath to be included in cache, got ${mediaPath}`);
   }
 
-  const {width, height} = thumbnailCacheEntryToDetails(cacheEntry);
+  const details = thumbnailCacheEntryToDetails(cacheEntry);
+
+  if (!details) {
+    throw new Error(`Couldn't determine any details for this image (${mediaPath})`);
+  }
+
+  const {width, height} = details;
+
+  if (typeof width !== 'number' && typeof height !== 'number') {
+    throw new Error(`Details for this image don't appear to contain dimensions (${mediaPath})`);
+  }
+
   return [width, height];
 }
 
@@ -792,6 +803,13 @@ export async function refreshThumbnailCache(cache, {mediaPath, queueSize}) {
         .map(([imagePath, cacheEntry]) => async () => {
           const details = thumbnailCacheEntryToDetails(cacheEntry);
 
+          // Couldn't parse this entry, it won't be used later on.
+          // But leave it around just in case some other version of hsmusic
+          // can get use out of it.
+          if (!details) {
+            return;
+          }
+
           const {tackbust, width, height} = details;
 
           let {md5, mtime} = details;