Moved config to project file and lazy loaded it

.cargo/config.toml

@@ -1,4 +0,0 @@
-[env]
-RUST_LOG="info"
-OOTT_ARP_SENDER_TIMEOUT="30"
-OOTT_ARP_SCAN_DURATION="60"

Cargo.toml

@@ -14,3 +14,6 @@ rusqlite = { version = "0.38.0", features = ["bundled", "chrono"] }
 rusqlite_migration = { version = "2.4.0", features = ["from-directory"] }
 include_dir = "0.7.4"
 chrono = "0.4.43"
+pushover = "0.4.0"
+config = "0.15.19"
+lazy_static = "1.5.0"

oott.toml

@@ -0,0 +1,6 @@
+[log]
+level = "info" # off, error, warn, info, debug, trace
+
+[timings]
+arp_sender_timeout="30"
+arp_scan_duration="60"

src/config.rs

@@ -1,19 +0,0 @@
-use log::error;
-use std::env;
-use std::fmt::Display;
-use std::str::FromStr;
-
-pub fn parse_env<T>(variable: &str) -> Option<T>
-where
-    T: FromStr,
-    <T as FromStr>::Err: Display,
-{
-    env::var(variable)
-        .map_err(|error| error!("{error}: {variable}"))
-        .ok()
-        .and_then(|raw| {
-            raw.parse::<T>()
-                .map_err(|error| error!("{error}: {raw}"))
-                .ok()
-        })
-}

src/device_finders/arp.rs

@@ -1,6 +1,6 @@
 mod packet_send_receive;
 
-use crate::{config, device_finders::Device};
+use crate::{device_finders::Device, settings::CONFIG};
 use log::{debug, error, info, warn};
 use packet_send_receive::{listen_for_packets, send_packet};
 use pnet::{
@@ -9,9 +9,6 @@ use pnet::{
 };
 use tokio::time::{Duration, timeout};
 
-const DEFAULT_SENDER_TIMEOUT: u64 = 60; // 1 minute to send all packets - good for a class C network
-const DEFAULT_SCAN_DURATION: u64 = 300; // 5 minutes to wait per round to receive responses
-
 pub async fn find(interface: &str) -> Result<Vec<Device>, String> {
     debug!("Looking up devices via ARP using interface {}", interface);
 
@@ -84,11 +81,9 @@ pub async fn find(interface: &str) -> Result<Vec<Device>, String> {
     let send_interface = network_interface.clone();
 
     // Get timeouts
-    let sender_timeout =
-        config::parse_env("OOTT_ARP_SENDER_TIMEOUT").unwrap_or(DEFAULT_SENDER_TIMEOUT);
+    let sender_timeout = CONFIG.timings.arp_sender_timeout;
     info!("Sender timeout set to {} seconds", sender_timeout);
-    let scan_duration =
-        config::parse_env("OOTT_ARP_SCAN_DURATION").unwrap_or(DEFAULT_SCAN_DURATION);
+    let scan_duration = CONFIG.timings.arp_scan_duration;
     let receiver_timeout = scan_duration * 2;
     info!("Scan duration set to {} seconds", scan_duration);
     info!("Receiver timeout set to {} seconds", receiver_timeout);

src/main.rs

@@ -1,15 +1,33 @@
-use log::{debug, info};
+use log::{LevelFilter, debug, info};
 use std::sync::{Arc, Mutex};
 
-mod config;
+use crate::settings::CONFIG;
+
 mod db;
 mod device_finders;
 mod events;
 mod mac_vendor_finder;
+mod settings;
 
 #[tokio::main]
 async fn main() -> Result<(), String> {
-    env_logger::init();
+    // Initialize logging
+    let log_level = match CONFIG.log.level.as_str() {
+        "off" => LevelFilter::Off,
+        "error" => LevelFilter::Error,
+        "warn" => LevelFilter::Warn,
+        "info" => LevelFilter::Info,
+        "debug" => LevelFilter::Debug,
+        "trace" => LevelFilter::Trace,
+        _ => LevelFilter::Error,
+    };
+
+    env_logger::Builder::new()
+        .filter(None, log_level)
+        .write_style(env_logger::WriteStyle::Always)
+        .init();
+
+    // Now onto the important stuff
     info!("Starting up oott");
 
     // Get database connection - thread protected

src/settings.rs

@@ -0,0 +1,47 @@
+use config::{Config, ConfigError, File};
+use lazy_static::lazy_static;
+use log::error;
+use serde::Deserialize;
+
+// -----------------------------------------------------------
+// Configuration structure
+#[derive(Debug, Deserialize, Clone)]
+pub struct Log {
+    pub level: String,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Timings {
+    pub arp_sender_timeout: u64,
+    pub arp_scan_duration: u64,
+}
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Settings {
+    pub log: Log,
+    pub timings: Timings,
+}
+// End configuration structure
+// -----------------------------------------------------------
+
+const CONFIG_FILE_PATH: &str = "./oott.toml";
+
+impl Settings {
+    pub fn new() -> Result<Self, ConfigError> {
+        let local_settings = Config::builder()
+            .add_source(File::with_name(CONFIG_FILE_PATH))
+            .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 ({CONFIG_FILE_PATH}): {error}");
+            panic!("Error reading configuration file ({CONFIG_FILE_PATH}): {error}");
+        }
+    };
+}