Add some internal logging

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/main.rs

@@ -2,6 +2,8 @@ use clap::Parser;
 use std::net::{IpAddr, SocketAddr};
 use std::sync::Arc;
 
+use tracing::{info, warn, error};
+use tracing_subscriber::{fmt, EnvFilter};
 #[derive(Debug, Clone, Parser)]
 #[command(
     name = "herocoordinator",
@@ -73,6 +75,14 @@ struct Cli {
 #[tokio::main]
 async fn main() {
     let cli = Cli::parse();
+// Initialize tracing subscriber (pretty formatter; controlled by RUST_LOG)
+let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
+tracing_subscriber::fmt()
+    .with_env_filter(filter)
+    .pretty()
+    .with_target(true)
+    .with_level(true)
+    .init();
 
     let http_addr = SocketAddr::new(cli.api_http_ip, cli.api_http_port);
     let ws_addr = SocketAddr::new(cli.api_ws_ip, cli.api_ws_port);
@@ -107,10 +117,7 @@ async fn main() {
     let http_module = herocoordinator::rpc::build_module(state.clone());
     let ws_module = herocoordinator::rpc::build_module(state.clone());
 
-    println!(
-        "Starting JSON-RPC servers: HTTP http://{} | WS ws://{} | redis_addr={}",
-        http_addr, ws_addr, cli.redis_addr
-    );
+    info!(%http_addr, %ws_addr, redis_addr=%cli.redis_addr, "Starting JSON-RPC servers");
 
     // Start servers
     let _http_handle = herocoordinator::rpc::start_http(http_addr, http_module)
@@ -122,7 +129,7 @@ async fn main() {
 
     // Wait for Ctrl+C to terminate
     if let Err(e) = tokio::signal::ctrl_c().await {
-        eprintln!("Failed to listen for shutdown signal: {e}");
+        error!(error=%e, "Failed to listen for shutdown signal");
     }
-    println!("Shutdown signal received, exiting.");
+    info!("Shutdown signal received, exiting.");
 }