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use tauri::{AppHandle, Manager, Emitter};
use tauri_plugin_shell::process::{CommandEvent, CommandChild};
use tauri_plugin_shell::ShellExt;
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::Mutex as TokioMutex;
#[derive(Debug, Serialize, Deserialize, Clone, Default)]
pub struct PythonBackendConfig {
pub host: String,
pub port: u16,
pub python_path: Option<String>,
pub script_path: String,
pub args: Vec<String>,
pub env: HashMap<String, String>,
}
impl Default for PythonBackendConfig {
fn default() -> Self {
Self {
host: "127.0.0.1".to_string(),
port: 8080,
python_path: None,
script_path: "backend/app/main.py".to_string(),
args: vec![],
env: HashMap::new(),
}
}
}
#[derive(Debug, Serialize, Deserialize, Clone, Default)]
pub struct BackendStatus {
pub running: bool,
pub pid: Option<u32>,
pub url: Option<String>,
pub error: Option<String>,
}
type BackendState = Arc<TokioMutex<Option<CommandChild>>>;
type StatusState = Arc<TokioMutex<BackendStatus>>;
static BACKEND_STATE: std::sync::OnceLock<BackendState> = std::sync::OnceLock::new();
static STATUS_STATE: std::sync::OnceLock<StatusState> = std::sync::OnceLock::new();
fn get_backend_state() -> &'static BackendState {
BACKEND_STATE.get_or_init(|| Arc::new(TokioMutex::new(None)))
}
fn get_status_state() -> &'static StatusState {
STATUS_STATE.get_or_init(|| Arc::new(TokioMutex::new(BackendStatus::default())))
}
pub fn init(app_handle: AppHandle) -> Result<(), Box<dyn std::error::Error>> {
// Initialize Python backend service
// Auto-start can be triggered from frontend
Ok(())
}
pub async fn start_backend(
app_handle: &AppHandle,
config: PythonBackendConfig,
) -> Result<BackendStatus, String> {
let state = get_backend_state();
let status = get_status_state();
// Check if already running
{
let status_guard = status.lock().await;
if status_guard.running {
return Ok(status_guard.clone());
}
}
// Determine python path
let python_cmd = config.python_path.unwrap_or_else(|| {
if cfg!(target_os = "windows") {
"python.exe".to_string()
} else {
"python3".to_string()
}
});
// Build command
let mut cmd = tauri_plugin_shell::Command::new(python_cmd);
cmd.arg(&config.script_path);
for arg in &config.args {
cmd.arg(arg);
}
// Set environment variables
for (key, value) in &config.env {
cmd.env(key, value);
}
// Add PYTHONPATH for relative imports
let backend_dir = std::path::Path::new(&config.script_path).parent().unwrap_or(std::path::Path::new("."));
cmd.env("PYTHONPATH", backend_dir);
// Spawn the process
let (mut rx, child) = cmd.spawn().map_err(|e| format!("Failed to spawn python backend: {}", e))?;
let pid = child.pid();
// Update state
{
let mut backend_guard = state.lock().await;
*backend_guard = Some(child);
}
// Update status
let backend_url = format!("http://{}:{}", config.host, config.port);
{
let mut status_guard = status.lock().await;
status_guard.running = true;
status_guard.pid = Some(pid);
status_guard.url = Some(backend_url.clone());
status_guard.error = None;
}
// Listen for process output
let app_handle = app_handle.clone();
let backend_url_clone = backend_url.clone();
tauri::async_runtime::spawn(async move {
while let Some(event) = rx.recv().await {
match event {
CommandEvent::Stdout(line) => {
let output = String::from_utf8_lossy(&line);
tracing::info!("[Python Backend] {}", output: {}", output.trim());
// Check if server started
if output.contains("Application startup complete") ||
output.contains("Uvicorn running on") ||
output.contains("Running on") {
let mut status_guard = status.lock().await;
status_guard.running = true;
drop(status_guard);
// Emit event to frontend
let _ = app_handle.emit("backend:ready", BackendStatus {
running: true,
pid: Some(pid),
url: Some(backend_url_clone.clone()),
error: None,
});
}
}
CommandEvent::Stderr(line) => {
let output = String::from_utf8_lossy(&line);
tracing::error!("[Python Back Error] {}", output.trim());
}
CommandEvent::Error(err) => {
tracing::error!("[Python Back Process Error] {}", err);
let mut status_guard = status.lock().await;
status_guard.running = false;
status_guard.error = Some(err.to_string());
let _ = app_handle.emit("backend:error", BackendStatus {
running: false,
pid: None,
url: None,
error: Some(err.to_string()),
});
}
CommandEvent::Exit(code) => {
tracing::info!("[Python Backend] Exited with code: {:?}", code);
let mut status_guard = status.lock().await;
status_guard.running = false;
status_guard.pid = None;
status_guard.url = None;
let _ = app_handle.emit("backend:stopped", BackendStatus {
running: false,
pid: None,
url: None,
error: Some("Process exited".to_string()),
});
}
_ => {}
}
}
});
// Return current status
let status_guard = status.lock().await;
Ok(status_guard.clone())
}
pub async fn stop_backend(app_handle: &AppHandle) -> Result<BackendStatus, String> {
let state = get_backend_state();
let status = get_status_state();
let mut backend_guard = state.lock().await;
if let Some(mut child) = backend_guard.take() {
child.kill().map_err(|e| format!("Failed to kill python backend: {}", e))?;
}
let mut status_guard = status.lock().await;
status_guard.running = false;
status_guard.pid = None;
status_guard.url = None;
let _ = app_handle.emit("backend:stopped", status_guard.clone());
Ok(status_guard.clone())
}
pub async fn get_backend_status() -> Result<BackendStatus, String> {
let status = get_status_state();
let status_guard = status.lock().await;
Ok(status_guard.clone())
}
pub async fn restart_backend(
app_handle: &AppHandle,
config: PythonBackendConfig,
) -> Result<BackendStatus, String> {
let _ = stop_backend(app_handle).await;
tokio::time::sleep(tokio::time::Duration::from_millis(1000)).await;
start_backend(app_handle, config).await
} |