read variables from a config file

.gitignore

@@ -1 +1,2 @@
 /target
+config.toml

Cargo.lock

@@ -20,6 +20,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
 [[package]]
 name = "err-derive"
 version = "0.3.1"
@@ -44,6 +50,22 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.16.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+
+[[package]]
+name = "indexmap"
+version = "2.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.180"
@@ -64,9 +86,17 @@ name = "mc-proxy-controller"
 version = "0.1.0"
 dependencies = [
  "rcon",
+ "serde",
  "tokio",
+ "toml",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
+
 [[package]]
 name = "mio"
 version = "1.1.1"
@@ -180,6 +210,45 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "serde"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a8e94ea7f378bd32cbbd37198a4a91436180c5bb472411e48b5ec2e2124ae9e"
+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_core"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d385c7d4ca58e59fc732af25c3983b67ac852c1a25000afe1175de458b67ad"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.228"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d540f220d3187173da220f885ab66608367b6574e925011a9353e4badda91d79"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.114",
+]
+
+[[package]]
+name = "serde_spanned"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf41e0cfaf7226dca15e8197172c295a782857fcb97fad1808a166870dee75a3"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "signal-hook-registry"
 version = "1.4.8"
@@ -268,6 +337,47 @@ dependencies = [
  "syn 2.0.114",
 ]
 
+[[package]]
+name = "toml"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
+dependencies = [
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_edit",
+]
+
+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_write",
+ "winnow",
+]
+
+[[package]]
+name = "toml_write"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.22"
@@ -380,3 +490,12 @@ name = "windows_x86_64_msvc"
 version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
+
+[[package]]
+name = "winnow"
+version = "0.7.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a5364e9d77fcdeeaa6062ced926ee3381faa2ee02d3eb83a5c27a8825540829"
+dependencies = [
+ "memchr",
+]

Cargo.toml

@@ -6,3 +6,5 @@ edition = "2024"
 [dependencies]
 rcon = { version = "0.6.0", features = ["rt-tokio"] }
 tokio = { version = "1.49.0", features = ["full"] }
+serde = { version = "1.0", features = ["derive"] }
+toml = "0.8"

src/main.rs

@@ -1,11 +1,31 @@
 use std::error::Error;
+use std::fs;
 use std::time::Duration;
 
 use rcon::Connection;
+use serde::Deserialize;
 use tokio::time::Instant;
 use tokio::{io::copy_bidirectional, main};
 use tokio::net::{TcpListener, TcpStream};
 
+#[derive(Debug, Deserialize)]
+struct Config {
+    listen_addr: String,
+    server_addr: String,
+    rcon_addr: String,
+    rcon_password: String,
+    idle_timeout_secs: u64,
+    polling_interval_millis: u64,
+}
+
+impl Config {
+    fn load(path: &str) -> Result<Self, Box<dyn Error>> {
+        let content = fs::read_to_string(path)?;
+        let config: Config = toml::from_str(&content)?;
+        Ok(config)
+    }
+}
+
 fn parse_players_online(s: &str) -> Option<u32> {
     s.split_whitespace()
         .find_map(|tok| tok.parse::<u32>().ok())
@@ -13,24 +33,24 @@ fn parse_players_online(s: &str) -> Option<u32> {
 
 #[main]
 async fn main() -> Result<(), Box<dyn Error>> {
-    let listen_addr = "0.0.0.0:8080";
+    let config = Config::load("config.toml")?;
-    let server_addr = "127.0.0.1:25565";
-    let rcon_addr = "127.0.0.1:25575";
 
-    println!("Listening on {listen_addr}");
+    println!("Listening on {}", config.listen_addr);
-    println!("Proxying to {server_addr}");
+    println!("Proxying to {}", config.server_addr);
 
-    let listener = TcpListener::bind(listen_addr).await?;
+    let listener = TcpListener::bind(&config.listen_addr).await?;
+    let server_addr = config.server_addr.clone();
 
     tokio::spawn(async move {
         let mut conn = <Connection<TcpStream>>::builder()
             .enable_minecraft_quirks(true)
-            .connect(rcon_addr, "Lusia669")
+            .connect(&config.rcon_addr, &config.rcon_password)
             .await.unwrap();
 
         let mut idle = false;
         let mut last_online = Instant::now();
-        let idle_timeout = Duration::from_secs(10);
+        let idle_timeout = Duration::from_secs(config.idle_timeout_secs);
+        let polling_interval = Duration::from_millis(config.polling_interval_millis);
 
         loop {
             let players_cmd_output = conn.cmd("list").await.unwrap();
@@ -50,12 +70,12 @@ async fn main() -> Result<(), Box<dyn Error>> {
                 idle = false;
             }
 
-            tokio::time::sleep(Duration::from_millis(250)).await;
+            tokio::time::sleep(polling_interval).await;
         };
     });
 
     while let Ok((mut inbound, _)) = listener.accept().await {
-        let mut outbound = TcpStream::connect(server_addr).await?;
+        let mut outbound = TcpStream::connect(&server_addr).await?;
 
         tokio::spawn(async move {
             if let Err(e) = copy_bidirectional(&mut inbound, &mut outbound).await {