modify: rust 插件
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//! Worker 进程主流程（对齐 Python process.py `worker_serve`）
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//!
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//! 流程:
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//! 1. 读全局 config.toml（[zenoh].json5_path）→ 打开 Zenoh 会话
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//! 2. 自读 config/workers/<type>/config.toml（[workers] 节展平 + mqtt_topics + cache）
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//! 3. 加载路由描述符，按 handler 注册表做契约自检（跳过无 handler 的端点）
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//! 4. （可选）建立共享缓存，登记实例参与方并启动心跳（多实例全局分摊）
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//! 5. 发布路由描述符 → 网关 RouteRegistry 动态挂载 HTTP 路由
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//! 6. 建 WorkerPool：每副本槽位 = liveliness token + 业务 Queryable + __admin__ Queryable
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//! 7. 每 10s 重发布描述符（自愈）
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//! 8. SIGTERM/SIGINT → 摘除路由 → 优雅关停全部副本 → 摘除实例 → 关闭会话
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use std::sync::Arc;
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use serde_json::Value;
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use tokio::signal::unix::{signal, SignalKind};
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use tokio::sync::Mutex;
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use crate::cache::Cache;
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use crate::config::{load_global_config, load_plugin_config};
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use crate::descriptor::load_routes_from_dir;
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use crate::publisher::{announce_loop, RoutePublisher};
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use crate::runtime::WorkerPool;
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use crate::HandlerRegistry;
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/// serve 入口参数
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pub struct ServeOptions {
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/// 全局配置文件路径（读取 [zenoh] 节）
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pub config_path: String,
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/// 插件配置目录（默认 "config/workers"）
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pub config_dir: String,
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/// 副本数覆盖（None = 使用插件配置中的 count）
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pub count: Option<usize>,
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/// 外部进程实例标识（多实例全局分摊用；缺省 {hostname}:{pid}）
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pub instance: Option<String>,
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}
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impl Default for ServeOptions {
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fn default() -> Self {
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Self {
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config_path: "config.toml".into(),
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config_dir: "config/workers".into(),
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count: None,
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instance: None,
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}
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}
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}
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/// 实例参与者心跳间隔（秒，与网关/ Python 一致）
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const INSTANCE_HEARTBEAT_SECS: u64 = 15;
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/// 启动独立 Worker 进程（阻塞直到收到 SIGTERM/SIGINT 并完成优雅退出）
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pub async fn serve(
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worker_type: &str,
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registry: Arc<HandlerRegistry>,
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opts: ServeOptions,
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) -> Result<(), String> {
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// 1. 全局配置 → Zenoh 会话
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let global = load_global_config(&opts.config_path)?;
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tracing::info!("[{}] 读取 Zenoh 配置: {}", worker_type, global.zenoh_json5_path);
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let zconfig = zenoh::Config::from_file(&global.zenoh_json5_path)
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.map_err(|e| format!("加载 Zenoh 配置 {} 失败: {e}", global.zenoh_json5_path))?;
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let session = zenoh::open(zconfig)
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.await
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.map_err(|e| format!("打开 Zenoh 会话失败: {e}"))?;
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tracing::info!("[{}] Zenoh 会话已建立", worker_type);
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// 2. 插件配置
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let plugin = load_plugin_config(worker_type, &opts.config_dir)?;
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if plugin.load_mode != "external" {
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tracing::warn!(
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"[{}] 插件配置 load_mode 不是 \"external\"：网关也会在进程内加载该插件，\
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外部进程将与网关内副本重复服务。",
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worker_type,
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);
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}
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// 2.5 共享缓存（[workers.cache]，进程插件自行管理）+ 实例参与方登记
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let cache_cfg = plugin
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.runtime
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.get("workers")
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.and_then(|w| w.get("cache"))
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.cloned();
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let (cache, backend) = match &cache_cfg {
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Some(cfg) => Cache::from_config(cfg).await,
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None => (Cache::None, "none".to_string()),
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};
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let mode = cache_cfg
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.as_ref()
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.and_then(|c| c.get("launch_worker_count").and_then(Value::as_str))
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.unwrap_or("toml")
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.to_lowercase();
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let instance_id = opts.instance.clone().unwrap_or_else(default_instance_id);
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if cache.enabled() {
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crate::cache::heartbeat_instance(&cache, worker_type, &instance_id).await;
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tracing::info!(
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"[{}] 已启用配置缓存（backend={backend}，mode={mode}）并登记实例参与方 {}",
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worker_type, instance_id,
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);
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}
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// 3. 路由描述符 + 契约自检
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let all_routes = load_routes_from_dir(worker_type, &opts.config_dir)?;
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let routes = contract_self_check(worker_type, &all_routes, ®istry)?;
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// 4. 发布路由描述符
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let publisher = Arc::new(RoutePublisher::new(session.clone(), worker_type));
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publisher
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.publish_routes(&routes, &plugin.mqtt_topics)
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.await?;
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// 5. 解析本进程应承载的副本数（多实例全局分摊）
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let default_count = opts.count.unwrap_or(plugin.count).max(1);
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let count = crate::cache::resolve_worker_count(
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&cache,
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worker_type,
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default_count,
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&mode,
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None,
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Some(&instance_id),
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)
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.await
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.max(1);
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// 6. 建 WorkerPool
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let pool: Arc<Mutex<WorkerPool>> = Arc::new(Mutex::new(WorkerPool::new(
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worker_type.to_string(),
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session.clone(),
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registry,
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routes.clone(),
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plugin.runtime.clone(),
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opts.config_dir,
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cache.clone(),
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instance_id.clone(),
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)));
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{
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let mut p = pool.lock().await;
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p.set_target(count, &pool).await;
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}
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tracing::info!("[{worker_type}] Worker 池就绪（{count} 副本）");
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// 7. 周期重发布（自愈）+ 实例心跳
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let announce = tokio::spawn(announce_loop(
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publisher.clone(),
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routes.clone(),
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plugin.mqtt_topics.clone(),
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));
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let hb_cache = cache.clone();
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let hb_type = worker_type.to_string();
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let hb_instance = instance_id.clone();
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let heartbeat = tokio::spawn(async move {
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let mut interval =
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tokio::time::interval(std::time::Duration::from_secs(INSTANCE_HEARTBEAT_SECS));
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interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Delay);
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loop {
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interval.tick().await;
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crate::cache::heartbeat_instance(&hb_cache, &hb_type, &hb_instance).await;
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}
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});
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tracing::info!("[{worker_type}] Worker 进程就绪，等待退出信号...");
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// 8. 等待退出信号
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let mut sigterm = signal(SignalKind::terminate())
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.map_err(|e| format!("注册 SIGTERM 失败: {e}"))?;
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let mut sigint = signal(SignalKind::interrupt())
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.map_err(|e| format!("注册 SIGINT 失败: {e}"))?;
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tokio::select! {
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_ = sigterm.recv() => tracing::info!("[{worker_type}] 收到 SIGTERM，优雅退出"),
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_ = sigint.recv() => tracing::info!("[{worker_type}] 收到 SIGINT，优雅退出"),
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}
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// 9. 优雅退出：停周期任务 → 摘除路由 → 关停全部副本 → 摘除实例 → 关闭会话
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announce.abort();
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let _ = announce.await;
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heartbeat.abort();
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let _ = heartbeat.await;
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publisher.unpublish().await;
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{
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let mut p = pool.lock().await;
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p.shutdown().await;
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}
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if cache.enabled() {
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crate::cache::unregister_instance(&cache, worker_type, &instance_id).await;
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}
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session
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.close()
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.await
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.map_err(|e| format!("关闭 Zenoh 会话失败: {e}"))?;
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tracing::info!("[{worker_type}] Worker 进程已退出");
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Ok(())
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}
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/// 契约自检：跳过无 handler 的端点，无可用端点则报错
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fn contract_self_check(
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worker_type: &str,
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all_routes: &[Value],
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registry: &HandlerRegistry,
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) -> Result<Vec<Value>, String> {
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let mut routes: Vec<Value> = Vec::new();
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for r in all_routes {
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let subject = r.get("subject").and_then(Value::as_str).unwrap_or("");
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let method = r.get("method").and_then(Value::as_str).unwrap_or("GET");
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let path = r.get("path").and_then(Value::as_str).unwrap_or("?");
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if registry.has(subject, method) {
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routes.push(r.clone());
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} else {
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tracing::warn!(
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"[{}] 跳过 {method} {path} (subject={subject}): 无对应 handler 注册",
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worker_type,
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);
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}
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}
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if routes.is_empty() {
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return Err(format!(
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"[{worker_type}] 没有任何可发布的端点（handler 注册表为空或全部被跳过）"
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));
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}
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tracing::info!("[{worker_type}] 契约自检通过，可发布 {} 个路由描述符", routes.len());
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Ok(routes)
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}
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/// 默认实例 id：{hostname}:{pid}（同机多进程自动区分）
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fn default_instance_id() -> String {
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let host = std::env::var("HOSTNAME").unwrap_or_else(|_| "localhost".to_string());
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format!("{host}:{}", std::process::id())
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}
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