initial commit

src/commands/pong.rs

@@ -0,0 +1,19 @@
+use std::io::Write;
+use std::net::TcpStream;
+use std::sync::{Arc, RwLock};
+
+use anyhow::Result;
+
+use crate::bank::Bank;
+use crate::commands::Command;
+use crate::protocol;
+
+pub struct Pong;
+
+impl Command for Pong {
+    fn execute(&self, _: Arc<RwLock<Bank>>, _: &[u8], mut stream: &TcpStream) -> Result<usize> {
+        info!("sending 'pong'");
+        let written = stream.write(&[protocol::PONG])?;
+        Ok(written)
+    }
+}