core&ui: add events channel

packages/hydrooj/src/model/user.ts

@@ -295,13 +295,14 @@ class UserModel {
     }
 
     @ArgMethod
-    static async inc(_id: number, field: string, n: number = 1) {
-        if (_id < -999) return null;
-        const udoc = await coll.findOne({ _id });
-        if (!udoc) throw new UserNotFoundError(_id);
-        await coll.updateOne({ _id }, { $inc: { [field]: n } });
-        deleteUserCache(udoc);
-        return udoc;
+    static async inc(_id: number | number[], field: string, n: number = 1) {
+        const ids = (Array.isArray(_id) ? _id : [_id]).filter((i) => i >= -999);
+        if (!ids.length) return null;
+        const udocs = await coll.find({ _id: { $in: ids } }).toArray();
+        if (udocs.length !== ids.length) throw new UserNotFoundError(_id);
+        await coll.updateMany({ _id: { $in: ids } }, { $inc: { [field]: n } });
+        for (const udoc of udocs) deleteUserCache(udoc);
+        return udocs;
     }
 
     @ArgMethod