H1-H10 优化OCR实时体验闭环

server/src/services/events.js

@@ -0,0 +1,104 @@
+const { EventEmitter } = require("node:events");
+
+function uniqueStrings(values) {
+  return Array.from(
+    new Set(
+      (Array.isArray(values) ? values : [])
+        .map((value) => (typeof value === "string" ? value.trim() : ""))
+        .filter(Boolean),
+    ),
+  );
+}
+
+function createAppEventBus() {
+  const emitter = new EventEmitter();
+  emitter.setMaxListeners(500);
+  let sequence = 0;
+
+  return {
+    publish(event) {
+      const payload = {
+        id: `${Date.now()}-${++sequence}`,
+        createdAt: new Date().toISOString(),
+        ...event,
+        audienceEmployeeIds: uniqueStrings(event?.audienceEmployeeIds),
+      };
+      emitter.emit("event", payload);
+      return payload;
+    },
+    subscribe(handler) {
+      emitter.on("event", handler);
+      return () => emitter.off("event", handler);
+    },
+  };
+}
+
+function buildInvoiceUpdatedEvent({
+  invoiceId,
+  status,
+  updatedAt = null,
+  audienceEmployeeIds = [],
+}) {
+  return {
+    type: "invoice.updated",
+    invoiceId,
+    status,
+    updatedAt: updatedAt ?? new Date().toISOString(),
+    audienceEmployeeIds: uniqueStrings(audienceEmployeeIds),
+  };
+}
+
+function publishInvoiceUpdated(fastify, event) {
+  if (!fastify?.appEvents || typeof fastify.appEvents.publish !== "function") {
+    return null;
+  }
+  return fastify.appEvents.publish(buildInvoiceUpdatedEvent(event));
+}
+
+function canReceiveEvent(employee, event, options = {}) {
+  if (!employee) {
+    return false;
+  }
+
+  if (event?.type === "invoice.updated" && options.canManageInvoice) {
+    return true;
+  }
+
+  const audience = uniqueStrings(event?.audienceEmployeeIds);
+  if (!audience.length) {
+    return false;
+  }
+
+  return audience.includes(employee.id);
+}
+
+function toClientEvent(event) {
+  if (!event) {
+    return null;
+  }
+
+  if (event.type === "invoice.updated") {
+    return {
+      id: event.id,
+      type: event.type,
+      invoiceId: event.invoiceId,
+      status: event.status ?? null,
+      updatedAt: event.updatedAt ?? event.createdAt ?? null,
+      createdAt: event.createdAt ?? null,
+    };
+  }
+
+  return {
+    id: event.id,
+    type: event.type,
+    createdAt: event.createdAt ?? null,
+  };
+}
+
+module.exports = {
+  buildInvoiceUpdatedEvent,
+  canReceiveEvent,
+  createAppEventBus,
+  publishInvoiceUpdated,
+  toClientEvent,
+};