use redis for video cache

Signed-off-by: zzls Selfhost <root@selfhost.zzls.xyz>

src/invidious/config.cr

@@ -74,6 +74,8 @@ class Config
   # Database configuration using 12-Factor "Database URL" syntax
   @[YAML::Field(converter: Preferences::URIConverter)]
   property database_url : URI = URI.parse("")
+  property redis_url : String?
+  property redis_socket : String?
   # Use polling to keep decryption function up to date
   property decrypt_polling : Bool = false
   # Used for crawling channels: threads should check all videos uploaded by a channel

src/invidious/database/videos.cr

@@ -10,7 +10,8 @@ module Invidious::Database::Videos
       ON CONFLICT (id) DO NOTHING
     SQL
 
-    PG_DB.exec(request, video.id, video.info.to_json, video.updated)
+    REDIS_DB.set(video.id, video.info.to_json, ex: 3600)
+    REDIS_DB.set(video.id + ":time", video.updated, ex: 3600)
   end
 
   def delete(id)
@@ -19,7 +20,8 @@ module Invidious::Database::Videos
       WHERE id = $1
     SQL
 
-    PG_DB.exec(request, id)
+    REDIS_DB.del(id)
+    REDIS_DB.del(id + ":time")
   end
 
   def delete_expired
@@ -47,6 +49,14 @@ module Invidious::Database::Videos
       WHERE id = $1
     SQL
 
-    return PG_DB.query_one?(request, id, as: Video)
+    if ((info = REDIS_DB.get(id)) && (time = REDIS_DB.get(id + ":time")))
+      return Video.new({
+        id:      id,
+        info:    JSON.parse(info).as_h,
+        updated: Time.parse(time, "%Y-%m-%d %H:%M:%S %z", Time::Location::UTC),
+      })
+    else
+      return nil
+    end
   end
 end

src/invidious/videos.cr

@@ -373,7 +373,7 @@ def get_video(id, refresh = true, region = nil, force_refresh = false)
        video.schema_version != Video::SCHEMA_VERSION # cache control
       begin
         video = fetch_video(id, region)
-        Invidious::Database::Videos.update(video)
+        Invidious::Database::Videos.insert(video)
       rescue ex
         Invidious::Database::Videos.delete(id)
         raise ex