Moved backend code into its own subfolder

backend/src/settings.rs

@@ -0,0 +1,92 @@
+use clap::Parser;
+use config::{Config, ConfigError, File};
+use duration_string::DurationString;
+use lazy_static::lazy_static;
+use log::{error, info};
+use serde::Deserialize;
+
+// -----------------------------------------------------------
+// Configuration structure
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Database {
+    pub path: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Networking {
+    pub interface: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Log {
+    pub level: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Timings {
+    pub wait_between_scans: DurationString,
+    pub arp_sender_timeout: DurationString,
+    pub arp_scan_duration: DurationString,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Pushover {
+    pub token: String,
+    pub user_key: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Notifications {
+    pub method: String,
+    pub pushover: Pushover,
+    pub notify_when_not_seen_for: DurationString,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Settings {
+    pub database: Database,
+    pub networking: Networking,
+    pub log: Log,
+    pub timings: Timings,
+    pub notifications: Notifications,
+}
+// End configuration structure
+// -----------------------------------------------------------
+
+// Command line parameters relevant to configuration
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Config file path
+    #[arg(short, long)]
+    config: Option<String>,
+}
+
+const DEFAULT_CONFIG_FILE_PATH: &str = "./oott.toml";
+
+impl Settings {
+    pub fn new() -> Result<Self, ConfigError> {
+        let args = Args::parse();
+
+        let config_path = args.config.unwrap_or(DEFAULT_CONFIG_FILE_PATH.to_string());
+
+        info!("Reading configuration from {}", config_path);
+
+        let local_settings = Config::builder()
+            .add_source(File::with_name(config_path.as_str()))
+            .build()?;
+
+        local_settings.try_deserialize()
+    }
+}
+
+lazy_static! {
+    pub static ref CONFIG: Settings = match Settings::new() {
+        Ok(value) => value,
+        Err(error) => {
+            error!("Error reading configuration file: {error}");
+            panic!("Error reading configuration file: {error}");
+        }
+    };
+}