fix server metrics framing issue

infra/enginewhy-server.rs

@@ -146,20 +146,14 @@ async fn main() -> std::io::Result<()> {
         }
         println!();
 
-        // Identify this process (client) by the local socket address used to connect
-        let server_identifier = match stream.local_addr() {
-            Ok(addr) => addr.to_string(),
-            Err(_) => format!("localhost:{}", PORT),
-        };
-
         let mut packet: HashMap<String, Value> = HashMap::new();
-        packet.insert("server_ip".to_string(), Value::String(server_identifier));
         packet.insert("cpu".to_string(), Value::from(cpu_usage));    // %
         packet.insert("mem".to_string(), Value::from(mem_usage));    // %
         packet.insert("net".to_string(), Value::from(net_usage_pct));
         packet.insert("io".to_string(), Value::from(io_usage));
 
         let serialized_packet = serde_json::to_string(&packet)?;
+        serialized_packet.push('\n');
         let _ = stream.write(serialized_packet.as_bytes());
 
         thread::sleep(Duration::from_secs(10));

src/main.rs

@@ -8,7 +8,7 @@ use crate::proxy::tcp::proxy_tcp_connection;
 use std::fs::File;
 use std::sync::atomic::{AtomicU64, Ordering};
 use tokio::net::{TcpListener, TcpStream};
-use tokio::io::AsyncReadExt;
+use tokio::io::{AsyncBufReadExt, AsyncReadExt};
 use serde_json::Value;
 use std::collections::HashMap;
 use std::net::{IpAddr};
@@ -16,7 +16,7 @@ use std::sync::{Arc, RwLock};
 use crate::backend::health::ServerMetrics;
 use rperf3::{Server, Config};
 use std::io::Read;
-
+use std::io::{BufRead, BufReader};
 
 static NEXT_CONN_ID: AtomicU64 = AtomicU64::new(1);
 
@@ -27,32 +27,52 @@ async fn start_iperf_server() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-async fn handle_connection(mut stream: TcpStream, healths: &HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>) -> std::io::Result<()> {
-    loop {
-        let mut buffer = [0u8; 512];
-        let bytes_read = stream.read(&mut buffer).await?; 
-        let receiving_data = String::from_utf8((buffer[..bytes_read]).to_vec())
-                                    .unwrap();
-        
-        let parsed_recdata : Value = serde_json::from_str(&receiving_data).unwrap();
-        let server_ip: IpAddr = parsed_recdata["server_ip"]
-                                .as_str()
-                                .unwrap()
-                                .parse()
-                                .unwrap();
+async fn handle_metrics_stream(stream: TcpStream, healths: &HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>) -> std::io::Result<()> {
+    let server_ip = stream.peer_addr()?.ip();
+    let mut reader = tokio::io::BufReader::new(stream);
+    let mut line = String::new();
 
-        healths.get(&server_ip)
-               .unwrap()
-               .write()
-               .unwrap()
-               .update(    
-                    parsed_recdata["cpu"].as_f64().unwrap(),
-                    parsed_recdata["mem"].as_f64().unwrap(),
-                    parsed_recdata["net"].as_f64().unwrap(),
-                    parsed_recdata["io"].as_f64().unwrap(),
-                );
+    loop {
+        line.clear();
+        
+        match reader.read_line(&mut line).await {
+            Ok(0) => break,
+            Ok(_) => {
+                if let Err(e) = process_metrics(server_ip, &line, healths) {
+                    eprintln!("skipping invalid packet: {}", e);
+                }
+            }
+            Err(e) => {
+                eprintln!("connection error: {}", e);
+                break;
+            }
+        }
     }
-    #[warn(unreachable_code)]
+    Ok(())
+}
+
+fn process_metrics(server_ip: IpAddr, json_str: &str, healths: &HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>) -> Result<(), String> {
+    let parsed: Value = serde_json::from_str(json_str)
+        .map_err(|e| format!("parse error: {}", e))?;
+
+    let metrics_lock = healths.get(&server_ip)
+        .ok_or_else(|| format!("unknown server: {}", server_ip))?;
+
+    let get_f64 = |key: &str| -> Result<f64, String> {
+        parsed.get(key)
+            .and_then(|v| v.as_f64())
+            .ok_or_else(|| format!("invalid '{}'", key))
+    };
+
+    if let Ok(mut guard) = metrics_lock.write() {
+        guard.update(
+            get_f64("cpu")?,
+            get_f64("mem")?,
+            get_f64("net")?,
+            get_f64("io")?,
+        );
+    }
+
     Ok(())
 }
 
@@ -67,7 +87,7 @@ async fn start_healthcheck_listener(addr: &str, healths: HashMap<IpAddr, Arc<RwL
             }
         };
 
-        if let Err(e) = handle_connection(stream, &healths).await {
+        if let Err(e) = handle_metrics_stream(stream, &healths).await {
             eprintln!("connection handler error: {}", e);
         }
     }
@@ -97,7 +117,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     handles.push(
         tokio::spawn(async {
-            start_healthcheck_listener("127.0.0.1:8080", healths).await.unwrap();
+            start_healthcheck_listener("0.0.0.0:8080", healths).await.unwrap();
         })
     );