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apps/miniprogram/utils/sessionBus.js

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+/**
+ * 小程序终端会话事件总线：
+ * 1. 插件运行时通过该总线订阅会话事件；
+ * 2. 终端页通过该总线暴露“当前活动会话”的发送能力。
+ */
+const EVENT_NAMES = ["connected", "disconnected", "stdout", "stderr", "latency"];
+
+const listeners = EVENT_NAMES.reduce((acc, key) => {
+  acc[key] = new Set();
+  return acc;
+}, {});
+
+let activeSessionSender = null;
+let currentSessionState = "disconnected";
+
+function onSessionEvent(eventName, handler) {
+  const name = String(eventName || "");
+  if (!listeners[name] || typeof handler !== "function") {
+    return () => {};
+  }
+  listeners[name].add(handler);
+  return () => {
+    listeners[name].delete(handler);
+  };
+}
+
+function emitSessionEvent(eventName, payload) {
+  const name = String(eventName || "");
+  const bucket = listeners[name];
+  if (name === "connected") {
+    currentSessionState = "connected";
+  } else if (name === "disconnected") {
+    currentSessionState = "disconnected";
+  }
+  if (!bucket) return;
+  bucket.forEach((handler) => {
+    try {
+      handler(payload);
+    } catch (error) {
+      console.error("[sessionBus.emit]", name, error);
+    }
+  });
+}
+
+function setActiveSessionSender(sender) {
+  activeSessionSender = typeof sender === "function" ? sender : null;
+  if (!activeSessionSender) {
+    currentSessionState = "disconnected";
+  }
+}
+
+async function sendToActiveSession(input, meta) {
+  if (!activeSessionSender) {
+    throw new Error("当前无活动终端会话");
+  }
+  await Promise.resolve(activeSessionSender(String(input || ""), meta));
+}
+
+module.exports = {
+  onSessionEvent,
+  emitSessionEvent,
+  setActiveSessionSender,
+  sendToActiveSession,
+  getSessionState() {
+    return currentSessionState;
+  }
+};