initial commit

src/commands/fail.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 Fail;
+
+impl Command for Fail {
+    fn execute(&self, _: Arc<RwLock<Bank>>, error_code: &[u8], mut stream: &TcpStream) -> Result<usize> {
+        error!("sending error code {}", error_code[0]);
+        let written = stream.write(&protocol::error(error_code[0]))?;
+        Ok(written)
+    }
+}