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//! Secure messenger for encrypted text communication
use tokio::sync::mpsc;
use tracing::{info, debug, warn};
use crate::{
connection::{ZkConnection, ZksConnection},
error::{Result, SdkError},
};
/// A secure messenger for encrypted text communication
pub struct SecureMessenger {
incoming_rx: mpsc::Receiver<String>,
outgoing_tx: mpsc::Sender<String>,
}
/// Message types for the secure messenger
#[derive(Debug, Clone)]
pub enum Message {
/// Regular text message
Text(String),
/// System notification
System(String),
/// File transfer notification
FileTransfer { name: String, size: u64 },
}
impl SecureMessenger {
/// Create a new secure messenger from a ZK connection
pub fn from_zk(mut connection: ZkConnection) -> Self {
let (incoming_tx, incoming_rx) = mpsc::channel::<String>(100);
let (outgoing_tx, outgoing_rx) = mpsc::channel::<String>(100);
// Spawn task to handle both incoming and outgoing messages
tokio::spawn(async move {
let mut outgoing_rx = outgoing_rx;
loop {
tokio::select! {
// Handle incoming messages
result = connection.recv_message() => {
match result {
Ok(data) => {
match String::from_utf8(data) {
Ok(text) => {
if let Err(_) = incoming_tx.send(text).await {
break;
}
}
Err(e) => {
warn!("Received invalid UTF-8 message: {}", e);
// Optionally, you could send a notification about invalid messages
// or implement a different encoding scheme
}
}
}
Err(e) => {
warn!("Failed to receive message: {}", e);
break;
}
}
}
// Handle outgoing messages
Some(message) = outgoing_rx.recv() => {
if let Err(e) = connection.send_message(message.as_bytes()).await {
warn!("Failed to send message: {}", e);
break;
}
}
else => break,
}
}
});
Self {
incoming_rx,
outgoing_tx,
}
}
/// Create a new secure messenger from a ZKS connection
pub fn from_zks(mut connection: ZksConnection) -> Self {
let (incoming_tx, incoming_rx) = mpsc::channel::<String>(100);
let (outgoing_tx, outgoing_rx) = mpsc::channel::<String>(100);
// Spawn task to handle both incoming and outgoing messages
tokio::spawn(async move {
let mut outgoing_rx = outgoing_rx;
loop {
tokio::select! {
// Handle incoming messages
result = connection.recv_message() => {
match result {
Ok(data) => {
if let Ok(text) = String::from_utf8(data) {
if let Err(_) = incoming_tx.send(text).await {
break;
}
}
}
Err(e) => {
warn!("Failed to receive message: {}", e);
break;
}
}
}
// Handle outgoing messages
Some(message) = outgoing_rx.recv() => {
if let Err(e) = connection.send_message(message.as_bytes()).await {
warn!("Failed to send message: {}", e);
break;
}
}
else => break,
}
}
});
Self {
incoming_rx,
outgoing_tx,
}
}
/// Send a text message
pub async fn send_text(&self, message: &str) -> Result<()> {
self.outgoing_tx.send(message.to_string()).await
.map_err(|_| SdkError::ConnectionFailed("Messenger closed".to_string()))?;
debug!("Sent text message: {}", message);
Ok(())
}
/// Receive a text message (blocking)
pub async fn recv_text(&mut self) -> Result<String> {
self.incoming_rx.recv().await
.ok_or_else(|| SdkError::ConnectionFailed("Messenger closed".to_string()))
}
/// Try to receive a text message (non-blocking)
pub fn try_recv_text(&mut self) -> Result<Option<String>> {
match self.incoming_rx.try_recv() {
Ok(message) => Ok(Some(message)),
Err(mpsc::error::TryRecvError::Empty) => Ok(None),
Err(mpsc::error::TryRecvError::Disconnected) => {
Err(SdkError::ConnectionFailed("Messenger closed".to_string()))
}
}
}
/// Send a system message
pub async fn send_system(&self, message: &str) -> Result<()> {
let system_msg = format!("SYSTEM: {}", message);
self.send_text(&system_msg).await
}
/// Get the number of pending incoming messages
pub fn pending_messages(&self) -> usize {
self.incoming_rx.len()
}
/// Close the messenger
pub async fn close(self) -> Result<()> {
info!("Closing secure messenger");
// The spawned tasks will exit when the channels are dropped
Ok(())
}
}