Improve handshake implementation a little

src/main.rs

@@ -1,7 +1,7 @@
 use rand::{thread_rng, RngCore};
 use std::env;
 use std::fs::remove_file;
-use std::io::{BufRead, BufReader, Write};
+use std::io::{BufRead, BufReader, Read, Write};
 use std::os::unix::net::{UnixListener, UnixStream};
 use std::path::PathBuf;
 use std::process::Command;
@@ -61,41 +61,46 @@ fn create_socket() -> PathBuf {
     temp_dir
 }
 
-fn handle_client(stream: UnixStream) {
-    let reader = BufReader::new(stream);
-
+fn handle_client(mut stream: UnixStream) {
     let start_time = SystemTime::now();
 
     const TIMEOUT: Duration = Duration::from_secs(3);
-    let handshake_msg = String::from("handshake");
 
-    let mut lines = reader.lines();
+    stream
+        .set_read_timeout(Some(Duration::from_millis(1)))
+        .unwrap();
 
-    match lines.next() {
-        Some(Ok(msg)) if msg == handshake_msg => {
-            if SystemTime::now().duration_since(start_time).unwrap() >= TIMEOUT {
-                println!("Client took too long to send first message");
-                return;
+    loop {
+        let mut response = String::new();
+
+        // Change to use buffered, read line until timeout, and catch timeout as below (hopefully can change timeout after initial read)
+
+        match stream.read_to_string(&mut response) {
+            Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {}
+            Err(e) => {
+                println!("Error reading {}", e);
             }
+            _ => {}
         }
-        Some(Ok(msg)) => {
-            println!("First line isn't handshake: {}", msg);
-            return;
-        }
-        Some(Err(e)) => {
-            println!("Failed to get first line: {}", e);
-            return;
-        }
-        None => {
-            println!("Client terminated before first message");
-            // If the stream ends here, abort
+
+        if response.trim_end() == "handshake" {
+            println!("Got correct handshake");
+            break;
+        }
+
+        if SystemTime::now().duration_since(start_time).unwrap() >= TIMEOUT {
+            println!("Timeout expired, killing connection");
             return;
         }
+
+        // thread::sleep(Duration::from_secs(1));
     }
 
-    println!("Got correct handshake");
+    stream.set_read_timeout(None).unwrap();
 
-    for line in lines {
+    let reader = BufReader::new(stream);
+
+    for line in reader.lines() {
         dbg!(line.unwrap());
     }
 
@@ -105,11 +110,17 @@ fn handle_client(stream: UnixStream) {
 fn client(path: String) {
     let mut stream = UnixStream::connect(path).unwrap();
 
-    writeln!(stream, "handshake").unwrap();
+    thread::sleep(Duration::from_secs(2));
 
-    thread::sleep(Duration::from_secs(1));
+    writeln!(stream, "handshake").unwrap();
+    writeln!(stream, "handshake1").unwrap();
+    writeln!(stream, "handshake2").unwrap();
+
+    thread::sleep(Duration::from_secs(2));
 
     writeln!(stream, "Hello world").unwrap();
+
+    thread::sleep(Duration::from_secs(2));
 }
 
 fn monitor_child(socket_path: PathBuf) {