Replace InfoCache to LRUCache

src/library/title.cr

@@ -60,10 +60,6 @@ class Title
     @entries.sort! do |a, b|
       sorter.compare a.title, b.title
     end
-
-    InfoCache.move_cover_url @id
-    InfoCache.move_progress_cache @id
-    InfoCache.move_sort_opt @dir
   end
 
   def to_slim_json : String
@@ -234,8 +230,8 @@ class Title
   end
 
   def cover_url
-    cached_cover_url = InfoCache.get_cover_url @id
-    return cached_cover_url if cached_cover_url
+    cached_cover_url = LRUCache.get "#{@id}:cover_url"
+    return cached_cover_url if cached_cover_url.is_a? String
 
     url = "#{Config.current.base_url}img/icon.png"
     readable_entries = @entries.select &.err_msg.nil?
@@ -248,12 +244,12 @@ class Title
         url = File.join Config.current.base_url, info_url
       end
     end
-    InfoCache.set_cover_url @id, url
+    LRUCache.set generate_cache_entry "#{@id}:cover_url", url
     url
   end
 
   def set_cover_url(url : String)
-    InfoCache.invalidate_cover_url @id
+    LRUCache.invalidate "#{@id}:cover_url"
     TitleInfo.new @dir do |info|
       info.cover_url = url
       info.save
@@ -262,7 +258,7 @@ class Title
 
   def set_cover_url(entry_name : String, url : String)
     selected_entry = @entries.find { |entry| entry.display_name == entry_name }
-    InfoCache.invalidate_cover_url selected_entry.id if selected_entry
+    LRUCache.invalidate "#{selected_entry.id}:cover_url" if selected_entry
     TitleInfo.new @dir do |info|
       info.entry_cover_url[entry_name] = url
       info.save
@@ -284,12 +280,14 @@ class Title
   end
 
   def deep_read_page_count(username) : Int32
-    # CACHE HERE
-    cached_sum = InfoCache.get_progress_cache @id, username, @entries
-    return cached_sum unless cached_sum.nil?
+    key = "#{@id}:#{username}:progress_sum"
+    sig = Digest::SHA1.hexdigest (entries.map &.id).to_s
+    cached_sum = LRUCache.get key
+    return cached_sum[1] if cached_sum.is_a? Tuple(String, Int32) &&
+                            cached_sum[0] == sig
     sum = load_progress_for_all_entries(username).sum +
           titles.flat_map(&.deep_read_page_count username).sum
-    InfoCache.set_progress_cache @id, username, @entries, sum
+    LRUCache.set generate_cache_entry key, {sig, sum}
     sum
   end
 
@@ -445,9 +443,9 @@ class Title
   end
 
   def bulk_progress(action, ids : Array(String), username)
-    InfoCache.invalidate_progress_cache @id, username
+    LRUCache.invalidate "#{@id}:#{username}:progress_sum"
     parents.each do |parent|
-      InfoCache.invalidate_progress_cache parent.id, username
+      LRUCache.invalidate "#{parent.id}:#{username}:progress_sum"
     end
     [false, true].each do |ascend|
       sorted_entries_cache_key =