fix: fix wrong invidious companion logic on backends

do not change to another companion if request fails

src/invidious.cr

@@ -113,9 +113,11 @@ YT_POOL = YoutubeConnectionPool.new(YT_URL, capacity: CONFIG.pool_size)
 
 GGPHT_POOL = YoutubeConnectionPool.new(URI.parse("https://yt3.ggpht.com"), capacity: CONFIG.pool_size)
 
-COMPANION_POOL = CompanionConnectionPool.new(
-  capacity: CONFIG.pool_size
-)
+COMPANION_POOL = [] of CompanionConnectionPool
+
+CONFIG.invidious_companion.each do |companion|
+  COMPANION_POOL << CompanionConnectionPool.new(companion, capacity: CONFIG.pool_size)
+end
 
 # CLI
 Kemal.config.extra_options do |parser|

src/invidious/yt_backend/connection_pool.cr

@@ -49,7 +49,7 @@ end
 struct CompanionConnectionPool
   property pool : DB::Pool(HTTP::Client)
 
-  def initialize(capacity = 5, timeout = 5.0)
+  def initialize(companion, capacity = 5, timeout = 5.0)
     options = DB::Pool::Options.new(
       initial_pool_size: 0,
       max_pool_size: capacity,
@@ -58,12 +58,11 @@ struct CompanionConnectionPool
     )
 
     @pool = DB::Pool(HTTP::Client).new(options) do
-      companion = CONFIG.invidious_companion.sample
       next make_client(companion.private_url, use_http_proxy: false)
     end
   end
 
-  def client(env : HTTP::Server::Context | Nil, &)
+  def client(&)
     conn = pool.checkout
 
     begin
@@ -71,14 +70,10 @@ struct CompanionConnectionPool
     rescue ex
       conn.close
 
-      if env.nil?
-        companion = CONFIG.invidious_companion.sample
-      else
-        current_companion = env.get("current_companion").as(Int32)
-        companion = CONFIG.invidious_companion[current_companion]
-      end
+      scheme = "https" if conn.tls || "http"
+      same_companion = "#{scheme}://#{conn.host}:#{conn.port}"
 
-      conn = make_client(companion.private_url, use_http_proxy: false)
+      conn = make_client(URI.parse(same_companion), use_http_proxy: false)
 
       response = yield conn
     ensure

src/invidious/yt_backend/youtube_api.cr

@@ -688,7 +688,12 @@ module YoutubeAPI
     # Send the POST request
 
     begin
-      response = COMPANION_POOL.client(env, &.post(endpoint, headers: headers, body: data.to_json))
+      if env.nil?
+        current_companion = rand(CONFIG.invidious_companion.size)
+      else
+        current_companion = env.get("current_companion").as(Int32)
+      end
+      response = COMPANION_POOL[current_companion].client &.post(endpoint, headers: headers, body: data.to_json)
       body = response.body
       if (response.status_code != 200)
         raise Exception.new(