bin/roowhod: configure loglevel via config file, use journald protocol

src/server/config.rs

@@ -8,6 +8,9 @@ pub const DEFAULT_CLIENT_SOCKET_PATH: &str = "/run/roowho2/server_client.sock";
 
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Config {
+    /// Logging level for the daemon.
+    pub log_level: Option<LogLevel>,
+
     /// Configuration for the rwhod server.
     pub rwhod: RwhodConfig,
 
@@ -17,6 +20,14 @@ pub struct Config {
     pub client_socket_path: Option<String>,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum LogLevel {
+    Info,
+    Debug,
+    Trace,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct RwhodConfig {
     /// Enable or disable the rwhod server functionality.