//! Simple port discovery for multiple Tauri instances.
//!
//! This module provides a lightweight mechanism for multiple Tauri apps
//! to coexist on the same machine by finding available ports dynamically.
/// Finds an available port for the WebSocket server.
///
/// # Arguments
///
/// * `bind_address` - The address to bind to (e.g., "0.0.0.0" or "127.0.0.1")
///
/// # Returns
///
/// An available port number in the range 9223-9322, or 9223 if none are available.
pub fn find_available_port(bind_address: &str) -> u16 {
let base_port = 9223;
let max_attempts = 100;
for offset in 0..max_attempts {
let port = base_port + offset;
if is_port_available(bind_address, port) {
return port;
}
}
// If no ports in the range are available, use default
// (The app will need to handle port conflicts)
base_port
}
/// Checks if a port is available on the specified bind address.
fn is_port_available(bind_address: &str, port: u16) -> bool {
use std::net::TcpListener;
TcpListener::bind(format!("{bind_address}:{port}")).is_ok()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_port_availability_all_interfaces() {
let port = find_available_port("0.0.0.0");
assert!(port >= 9223);
assert!(port < 9323);
}
#[test]
fn test_port_availability_localhost() {
let port = find_available_port("127.0.0.1");
assert!(port >= 9223);
assert!(port < 9323);
}
}
