153 lines
4.5 KiB
Rust
153 lines
4.5 KiB
Rust
use std::collections::HashMap;
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use std::sync::{
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atomic::{AtomicU64, Ordering},
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Arc,
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};
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use anyhow::{anyhow, Result};
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use tokio::sync::{mpsc, oneshot, RwLock};
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use tracing::{debug, warn};
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use crate::server::ServerManager;
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const DEFAULT_QUEUE_CAPACITY: usize = 256;
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#[derive(Debug)]
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struct CommandJob {
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command: String,
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response_tx: oneshot::Sender<Result<()>>,
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}
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#[derive(Clone)]
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struct WorkerHandle {
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id: u64,
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sender: mpsc::Sender<CommandJob>,
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}
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pub struct CommandDispatcher {
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server_manager: Arc<ServerManager>,
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workers: Arc<RwLock<HashMap<String, WorkerHandle>>>,
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next_worker_id: Arc<AtomicU64>,
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queue_capacity: usize,
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}
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impl CommandDispatcher {
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pub fn new(server_manager: Arc<ServerManager>) -> Self {
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Self {
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server_manager,
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workers: Arc::new(RwLock::new(HashMap::new())),
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next_worker_id: Arc::new(AtomicU64::new(1)),
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queue_capacity: DEFAULT_QUEUE_CAPACITY,
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}
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}
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pub async fn send_command(&self, server_uuid: &str, command: &str) -> Result<()> {
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let cmd = command.trim();
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if cmd.is_empty() {
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return Err(anyhow!("Command cannot be empty"));
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}
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// Retry once if the current worker channel is unexpectedly closed.
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for _ in 0..2 {
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let worker = self.get_or_create_worker(server_uuid).await;
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let (response_tx, response_rx) = oneshot::channel();
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let job = CommandJob {
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command: cmd.to_string(),
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response_tx,
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};
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match worker.sender.send(job).await {
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Ok(_) => {
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return response_rx
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.await
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.unwrap_or_else(|_| Err(anyhow!("Command worker dropped response channel")));
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}
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Err(send_err) => {
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warn!(
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server_uuid = %server_uuid,
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worker_id = worker.id,
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error = %send_err,
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"Command worker queue send failed, rotating worker",
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);
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self.remove_worker_if_matches(server_uuid, worker.id).await;
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}
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}
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}
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Err(anyhow!("Failed to dispatch command after retry"))
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}
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async fn get_or_create_worker(&self, server_uuid: &str) -> WorkerHandle {
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if let Some(existing) = self.workers.read().await.get(server_uuid).cloned() {
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return existing;
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}
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let worker_id = self.next_worker_id.fetch_add(1, Ordering::Relaxed);
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let (sender, receiver) = mpsc::channel::<CommandJob>(self.queue_capacity);
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let handle = WorkerHandle {
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id: worker_id,
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sender: sender.clone(),
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};
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{
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let mut workers = self.workers.write().await;
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if let Some(existing) = workers.get(server_uuid).cloned() {
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return existing;
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}
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workers.insert(server_uuid.to_string(), handle.clone());
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}
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self.spawn_worker(server_uuid.to_string(), worker_id, receiver);
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handle
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}
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fn spawn_worker(
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&self,
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server_uuid: String,
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worker_id: u64,
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mut receiver: mpsc::Receiver<CommandJob>,
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) {
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let server_manager = self.server_manager.clone();
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let workers = self.workers.clone();
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tokio::spawn(async move {
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debug!(server_uuid = %server_uuid, worker_id, "Command worker started");
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while let Some(job) = receiver.recv().await {
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let result = execute_command(server_manager.clone(), &server_uuid, &job.command).await;
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let _ = job.response_tx.send(result);
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}
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let mut map = workers.write().await;
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if let Some(current) = map.get(&server_uuid) {
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if current.id == worker_id {
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map.remove(&server_uuid);
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}
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}
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debug!(server_uuid = %server_uuid, worker_id, "Command worker stopped");
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});
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}
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async fn remove_worker_if_matches(&self, server_uuid: &str, worker_id: u64) {
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let mut workers = self.workers.write().await;
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if let Some(current) = workers.get(server_uuid) {
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if current.id == worker_id {
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workers.remove(server_uuid);
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}
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}
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}
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}
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async fn execute_command(
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server_manager: Arc<ServerManager>,
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server_uuid: &str,
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command: &str,
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) -> Result<()> {
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server_manager
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.docker()
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.send_command(server_uuid, command)
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.await?;
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Ok(())
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}
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