telnetd implementing more stuff.

gemmatelnet/src/bin/gemmatelnetd.rs

@@ -1,3 +1,50 @@
-fn main() {
-    println!("Taxation is Theft");
+use std::io::{BufRead, BufReader, Write};
+use std::net::{TcpListener, TcpStream};
+use std::thread;
+use gemma::chip8::computer_manager::Chip8ComputerManager;
+use gemma::chip8::quirk_modes::QuirkMode;
+use gemmatelnet::client_handler::handle_client;
+use log::info;
+use clap::Parser;
+
+const LISTEN_HOST: &str = "0.0.0.0";
+const LISTEN_PORT: u32 = 1420;
+
+#[derive(Parser, Debug)]
+#[command(name = "myapp")]
+#[command(about = "Does awesome things", long_about = None)]
+struct Cli {
+    #[arg(long, default_value = "0.0.0.0")]
+    host: Option<String>,
+    #[arg(long, default_value = "1420")]
+    port: Option<u32>,
+}
+
+impl Cli {
+    pub fn host(&self) -> String {
+        self.host.clone().unwrap_or(LISTEN_HOST.into())
+    }
+    pub fn port(&self) -> u32 {
+        self.port.unwrap_or(LISTEN_PORT.into())
+    }
+}
+
+fn main() -> std::io::Result<()> {
+    let config = Cli::parse();
+
+    let listener = TcpListener::bind(format!("{}:{}", config.host(), config.port()))?;
+    println!("Listening to {}:{}", LISTEN_HOST, LISTEN_PORT);
+
+    for stream in listener.incoming() {
+        match stream {
+            Ok(stream) => {
+                thread::spawn(|| handle_client(stream));
+            }
+            Err(e) => {
+                eprintln!("Connection Failed -> {}", e);
+            }
+        }
+    }
+
+    Ok(())
 }

gemmatelnet/src/client_handler.rs

@@ -0,0 +1,127 @@
+use std::io::{BufRead, BufReader};
+use std::net::TcpStream;
+use gemma::chip8::computer_manager::Chip8ComputerManager;
+use gemma::chip8::quirk_modes::QuirkMode;
+use crate::telnet_utils::list_of_files_in_directory;
+use std::io::Write;
+use std::path::Path;
+
+const CANT_NOTIFY_ERROR: &str = "Unable to notify client";
+const MENU_TEXT: &str = r#"
+---------------------------
+status -> Current status of the Instance
+new -> Start New Instance
+* list -> list available files to load into Chip-8 Instance
+* load <filename> -> Load Chip-8 Program from server
+menu -> display the menu
+step -> step chip-8 machine 1 step
+* steps <number> -> Step a fixed number of steps
+* memory -> dump current memory from chip-8 instance
+* video -> dump current video from chip-8 instance
+* window <start> <length> -> display a window of memory
+disconnect -> close connection
+---------------------------
+"#;
+
+pub fn handle_client(mut stream: TcpStream) {
+    // each client gets their own instance of a Chip-8 system
+    let mut chip8 = Chip8ComputerManager::default();
+
+    let peer_addr = stream.peer_addr().unwrap();
+    println!("New CX From {}", peer_addr);
+
+    let mut reader = BufReader::new(stream.try_clone().unwrap());
+    let mut line = String::new();
+
+    write!(stream, "Welcome to Gemma Telnet Server\n").unwrap();
+    write!(stream, "{}", MENU_TEXT).unwrap();
+
+    let mut time_to_die: bool = false;
+
+    while !time_to_die {
+
+        // clear the buffer
+        line.clear();
+
+        // read from the client to the buffer
+        let bytes = reader.read_line(&mut line).unwrap();
+        if bytes == 0 {
+            println!("Connection closed by {}", peer_addr);
+            break;
+        }
+
+        // display the message received
+        eprint!("RX {}: {}", peer_addr, line);
+
+        // split the line into <command> <param1> <param2> (if params exist)
+
+        let mut result = line.split(" ");
+        let command = result.next().unwrap();
+        let p1 = result.next();
+        let p2 = result.next();
+
+        let mut message_to_send: String = "Unrecognized Command".to_string();
+
+        match command.trim() {
+            "status" => {
+                message_to_send = chip8.status_as_string();
+            }
+            "disconnect" => {
+                message_to_send = "Disconnecting User".to_string();
+                time_to_die = true;
+                break;
+            }
+            "new" => {
+                message_to_send = "Starting new Chip-8 Instance".to_string();
+                chip8.reset(QuirkMode::Chip8);
+            }
+            "list" => {
+                message_to_send =
+                    format!("Listing files in path: \n{}",
+                            list_of_files_in_directory(
+                                &mut Path::new("/home/tmerritt/Projects/trevors_chip8_toy/resources/roms".into())
+                            )
+                    );
+            }
+            "load" => {
+
+                // chip8 = Chip8ComputerManager::from(chip8).load_new_program_to_system_memory()
+                message_to_send = format!("Preparing to load {} from disk.",
+                                          p1.unwrap_or("default.ch8").trim());
+                chip8.start();
+            }
+            "menu" => {
+                message_to_send = MENU_TEXT.to_string();
+            }
+            "steps" => {
+                if chip8.core_should_run {
+                    let num_steps = p1.unwrap_or("0").trim();
+                    message_to_send = format!("Advancing {} steps.", num_steps);
+                    for _ in 0..num_steps.parse().unwrap_or(0) {
+                        chip8.tick();
+                    }
+                } else {
+                    message_to_send = "Not Ready to Step".to_string();
+                }
+            }
+            "step" => {
+                if chip8.core_should_run {
+                    message_to_send = "Advancing 1 step.".to_string();
+                    chip8.tick();
+                } else {
+                    message_to_send = "Not Ready To Step".to_string();
+                }
+            }
+            "window" => {
+                message_to_send = format!("Memory window from {} to {}",
+                                          p1.unwrap_or("0x0000").trim(),
+                                          p2.unwrap_or("0xFFFF").trim());
+            }
+            _ => {}
+        }
+
+        write!(stream, "{}\n", message_to_send).expect(CANT_NOTIFY_ERROR);
+
+        stream.flush().unwrap();
+    }
+}

gemmatelnet/src/lib.rs

@@ -0,0 +1,3 @@
+
+pub mod telnet_utils;
+pub mod client_handler;

gemmatelnet/src/telnet_utils.rs

@@ -0,0 +1,18 @@
+use std::{fs, io};
+use std::path::Path;
+
+pub fn list_of_files_in_directory(root_directory: &Path) -> String {
+
+     let mut return_value = String::new();
+
+     if root_directory.is_dir() {
+          for entry in fs::read_dir(root_directory).unwrap() {
+               let entry = entry.unwrap();
+               let path = entry.path();
+               if path.is_file() {
+                    return_value = format!("{}\n{}", return_value, path.file_name().unwrap().to_string_lossy());
+               }
+          }
+     }
+     return_value
+}