Allow providing 12-Factor-style Database URL in config

src/invidious/helpers/helpers.cr

@@ -64,11 +64,14 @@ end
 class Config
   include YAML::Serializable
 
-  property channel_threads : Int32 = 1             # Number of threads to use for crawling videos from channels (for updating subscriptions)
-  property feed_threads : Int32 = 1                # Number of threads to use for updating feeds
-  property output : String = "STDOUT"              # Log file path or STDOUT
-  property log_level : LogLevel = LogLevel::Info   # Default log level, valid YAML values are ints and strings, see src/invidious/helpers/logger.cr
-  property db : DBConfig                           # Database configuration
+  property channel_threads : Int32 = 1           # Number of threads to use for crawling videos from channels (for updating subscriptions)
+  property feed_threads : Int32 = 1              # Number of threads to use for updating feeds
+  property output : String = "STDOUT"            # Log file path or STDOUT
+  property log_level : LogLevel = LogLevel::Info # Default log level, valid YAML values are ints and strings, see src/invidious/helpers/logger.cr
+  property db : DBConfig? = nil                  # Database configuration with separate parameters (username, hostname, etc)
+
+  @[YAML::Field(converter: Preferences::URIConverter)]
+  property database_url : URI = URI.parse("")      # Database configuration using 12-Factor "Database URL" syntax
   property decrypt_polling : Bool = true           # Use polling to keep decryption function up to date
   property full_refresh : Bool = false             # Used for crawling channels: threads should check all videos uploaded by a channel
   property https_only : Bool?                      # Used to tell Invidious it is behind a proxy, so links to resources should be https://
@@ -170,6 +173,23 @@ class Config
         end
     {% end %}
 
+    # Build database_url from db.* if it's not set directly
+    if config.database_url.to_s.empty?
+      if db = config.db
+        config.database_url = URI.new(
+          scheme: "postgres",
+          user: db.user,
+          password: db.password,
+          host: db.host,
+          port: db.port,
+          path: db.dbname,
+        )
+      else
+        puts "Config : Either database_url or db.* is required"
+        exit(1)
+      end
+    end
+
     return config
   end
 end

src/invidious/users.cr

@@ -173,6 +173,20 @@ struct Preferences
     end
   end
 
+  module URIConverter
+    def self.to_yaml(value : URI, yaml : YAML::Nodes::Builder)
+      yaml.scalar value.normalize!
+    end
+
+    def self.from_yaml(ctx : YAML::ParseContext, node : YAML::Nodes::Node) : URI
+      if node.is_a?(YAML::Nodes::Scalar)
+        URI.parse node.value
+      else
+        node.raise "Expected scalar, not #{node.class}"
+      end
+    end
+  end
+
   module ProcessString
     def self.to_json(value : String, json : JSON::Builder)
       json.string value