add the ability to listen on unix sockets

src/invidious.cr

@@ -3917,6 +3917,15 @@ add_context_storage_type(Preferences)
 add_context_storage_type(User)
 
 Kemal.config.logger = LOGGER
-Kemal.config.host_binding = Kemal.config.host_binding != "0.0.0.0" ? Kemal.config.host_binding : CONFIG.host_binding
-Kemal.config.port = Kemal.config.port != 3000 ? Kemal.config.port : CONFIG.port
-Kemal.run
+
+Kemal.run do |config|
+  if CONFIG.bind_unix
+    if File.exists?(CONFIG.bind_unix.not_nil!)
+      File.delete(CONFIG.bind_unix.not_nil!)
+    end
+    config.server.not_nil!.bind_unix CONFIG.bind_unix.not_nil!
+  else
+    config.host_binding = config.host_binding != "0.0.0.0" ? config.host_binding : CONFIG.host_binding
+    config.port = config.port != 3000 ? config.port : CONFIG.port
+  end
+end

src/invidious/helpers/helpers.cr

@@ -98,6 +98,7 @@ class Config
   property force_resolve : Socket::Family = Socket::Family::UNSPEC # Connect to YouTube over 'ipv6', 'ipv4'. Will sometimes resolve fix issues with rate-limiting (see https://github.com/ytdl-org/youtube-dl/issues/21729)
   property port : Int32 = 3000                                     # Port to listen for connections (overrided by command line argument)
   property host_binding : String = "0.0.0.0"                       # Host to bind (overrided by command line argument)
+  property bind_unix : String? = nil                               # Make Invidious listening on UNIX sockets - Example: /tmp/invidious.sock
   property pool_size : Int32 = 100                                 # Pool size for HTTP requests to youtube.com and ytimg.com (each domain has a separate pool of `pool_size`)
   property use_quic : Bool = true                                  # Use quic transport for youtube api