Add the ability to listen on UNIX sockets

config/config.example.yml

@@ -130,6 +130,27 @@ https_only: false
 ##
 #hsts: true
 
+##
+## Path of a UNIX socket to listen on for incoming connections.
+##
+## Note: Enabling socket will make invidious stop listening on the address
+## specified by 'host_binding' and 'port'.
+##
+## Accepted values: Any path to a new file (that doesn't exist yet)
+## Default: <none>
+##
+socket_binding: /tmp/invidious.sock
+
+##
+## Permissions for the UNIX socket specified by 'socket_binding'.
+##
+## Note: The permissions are given in octal, following UNIX convention.
+##
+## Accepted values: 000-777
+## Default: 777
+##
+socket_permissions: 777
+
 
 # -----------------------------
 #  Network (outbound)
@@ -177,7 +198,7 @@ https_only: false
 ## Configuration for using a HTTP proxy
 ##
 ## If unset, then no HTTP proxy will be used.
-## 
+##
 http_proxy:
   user:
   password:
@@ -839,7 +860,7 @@ default_user_preferences:
   ## Default: true
   ##
   #vr_mode: true
-  
+
   ##
   ## Save the playback position
   ## Allow to continue watching at the previous position when

src/invidious.cr

@@ -239,8 +239,6 @@ add_context_storage_type(Preferences)
 add_context_storage_type(Invidious::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.config.app_name = "Invidious"
 
 # Use in kemal's production mode.
@@ -249,4 +247,18 @@ Kemal.config.app_name = "Invidious"
   Kemal.config.env = "production" if !ENV.has_key?("KEMAL_ENV")
 {% end %}
 
-Kemal.run
+Kemal.run do |config|
+  if CONFIG.socket_binding
+    if File.exists?(CONFIG.socket_binding.not_nil!)
+      File.delete(CONFIG.socket_binding.not_nil!)
+    end
+    # Create a socket and set its desired permissions
+    server = UNIXServer.new(CONFIG.socket_binding.not_nil!)
+    perms = CONFIG.socket_permissions.to_i(base: 8)
+    File.chmod(CONFIG.socket_binding.not_nil!, perms)
+    config.server.not_nil!.bind server
+  else
+    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
+  end
+end

src/invidious/config.cr

@@ -138,6 +138,10 @@ class Config
   property port : Int32 = 3000
   # Host to bind (overridden by command line argument)
   property host_binding : String = "0.0.0.0"
+  # Make Invidious listen on a UNIX socket instead of a TCP port - Example: /tmp/invidious.sock
+  property socket_binding : String? = nil
+  # Permissions of the listening socket in octal
+  property socket_permissions : String = "777"
   # Pool size for HTTP requests to youtube.com and ytimg.com (each domain has a separate pool of `pool_size`)
   property pool_size : Int32 = 100
   # HTTP Proxy configuration