fix: remove error!() usage

src/main.rs

@@ -1,7 +1,6 @@
 use crate::config::Config;
 use anyhow::Result;
 use std::env;
-use tracing::error;
 
 mod client;
 mod config;
@@ -20,7 +19,7 @@ async fn main() -> Result<()> {
     // TODO: use clap crate for CLI arguments
     let args: Vec<String> = env::args().collect();
     if args.len() != 4 {
-        error!("Insufficient args entered! Usage: ./program client <file_to_get> or ./program server <file_to_serve> <pre_shared_secret>");
+        eprintln!("Insufficient args entered! Usage: ./program client <file_to_get> or ./program server <file_to_serve> <pre_shared_secret>");
     }
 
     // client mode or server mode
@@ -39,7 +38,7 @@ async fn main() -> Result<()> {
             .await
             .unwrap();
     } else {
-        error!("Incorrect args entered!");
+        eprintln!("Incorrect args entered!");
     }
     Ok(())
 }

src/nat.rs

@@ -3,7 +3,7 @@ use std::net::{SocketAddr, ToSocketAddrs};
 use std::time::Duration;
 use stunclient::StunClient;
 use tokio::net::UdpSocket;
-use tracing::{error, info, warn};
+use tracing::{info, warn};
 
 const DUMMY_MSG_NUM: usize = 5;
 const MAX_WAIT_TIME: Duration = Duration::from_millis(500);
@@ -74,7 +74,7 @@ async fn get_external_info(socket: &UdpSocket, ip: String) -> SocketAddr {
             x
         }
         Err(_) => {
-            error!("Error at protocol.rs: STUN");
+            eprintln!("Error at protocol.rs: STUN");
             socket.local_addr().unwrap()
         }
     }

src/server.rs

@@ -2,7 +2,6 @@ use anyhow::Result;
 use quinn::{ConnectionError, Endpoint, EndpointConfig, ServerConfig};
 use std::sync::Arc;
 use tokio::net::UdpSocket;
-use tracing::error;
 
 /// Constructs a QUIC endpoint configured to listen for incoming connections on a certain address
 /// and port.
@@ -59,7 +58,7 @@ pub async fn run_server(
             if msg.len() == 2 && msg[0] == filename && msg[1] == auth {
                 eprintln!("Got good message from client");
             } else {
-                error!("Bad message; could not authenticate: {} {}", msg[0], msg[1]);
+                eprintln!("Bad message; could not authenticate: {} {}", msg[0], msg[1]);
             }
             let buffer = crate::file::get_file_contents(filename).await?;
             tx.write_all(&buffer).await?;