stop the server if no players are detected for a given time

Cargo.lock

@@ -20,6 +20,20 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "err-derive"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c34a887c8df3ed90498c1c437ce21f211c8e27672921a8ffa293cb8d6d4caa9e"
+dependencies = [
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn 1.0.109",
+ "synstructure",
+]
+
 [[package]]
 name = "errno"
 version = "0.3.14"
@@ -49,6 +63,7 @@ dependencies = [
 name = "mc-proxy-controller"
 version = "0.1.0"
 dependencies = [
+ "rcon",
  "tokio",
 ]
 
@@ -92,6 +107,30 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.106"
@@ -110,6 +149,16 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rcon"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "618babf41c041e7d6f4baf27f6d92434be58c1eb637edac7f9af7900f247417b"
+dependencies = [
+ "err-derive",
+ "tokio",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -119,6 +168,12 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -151,6 +206,17 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.114"
@@ -162,6 +228,18 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.12.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "unicode-xid",
+]
+
 [[package]]
 name = "tokio"
 version = "1.49.0"
@@ -187,7 +265,7 @@ checksum = "af407857209536a95c8e56f8231ef2c2e2aff839b22e07a1ffcbc617e9db9fa5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.114",
 ]
 
 [[package]]
@@ -196,6 +274,18 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9312f7c4f6ff9069b165498234ce8be658059c6728633667c526e27dc2cf1df5"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ebc1c04c71510c7f702b52b7c350734c9ff1295c464a03335b00bb84fc54f853"
+
+[[package]]
+name = "version_check"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"

Cargo.toml

@@ -4,4 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+rcon = { version = "0.6.0", features = ["rt-tokio"] }
 tokio = { version = "1.49.0", features = ["full"] }

src/main.rs

@@ -1,18 +1,59 @@
 use std::error::Error;
+use std::time::Duration;
 
+use rcon::Connection;
+use tokio::time::Instant;
 use tokio::{io::copy_bidirectional, main};
 use tokio::net::{TcpListener, TcpStream};
 
+fn parse_players_online(s: &str) -> Option<u32> {
+    s.split_whitespace()
+        .find_map(|tok| tok.parse::<u32>().ok())
+}
+
 #[main]
 async fn main() -> Result<(), Box<dyn Error>> {
     let listen_addr = "0.0.0.0:8080";
     let server_addr = "127.0.0.1:25565";
+    let rcon_addr = "127.0.0.1:25575";
 
     println!("Listening on {listen_addr}");
     println!("Proxying to {server_addr}");
 
     let listener = TcpListener::bind(listen_addr).await?;
 
+    tokio::spawn(async move {
+        let mut conn = <Connection<TcpStream>>::builder()
+            .enable_minecraft_quirks(true)
+            .connect(rcon_addr, "Lusia669")
+            .await.unwrap();
+
+        let mut idle = false;
+        let mut last_online = Instant::now();
+        let idle_timeout = Duration::from_secs(10);
+
+        loop {
+            let players_cmd_output = conn.cmd("list").await.unwrap();
+            let players_number = parse_players_online(&players_cmd_output).unwrap();
+
+            if players_number > 0 {
+                last_online = Instant::now();
+            }
+
+            println!("{players_number} {idle}");
+
+            if Instant::now() - last_online > idle_timeout {
+                idle = true;
+                println!("Stopping the server");
+                conn.cmd("stop").await.unwrap();
+            } else {
+                idle = false;
+            }
+
+            tokio::time::sleep(Duration::from_millis(250)).await;
+        };
+    });
+
     while let Ok((mut inbound, _)) = listener.accept().await {
         let mut outbound = TcpStream::connect(server_addr).await?;