聊天：增加私聊部分逻辑

测试：增加测试脚本，减少socket断开的打印

shared/db/PrivateMessage.ts

@@ -23,20 +23,31 @@ export default class PrivateMessage extends BaseModel {
     targetRoleName: string; // 接收者名称
 
     @prop({ required: true, default: '' })
-    msgId: string; // 消息唯一 Id
+    msgCode: string; // 消息唯一 Id
     @prop({ required: true, default: 0 })
     seqId: number; // 消息在本聊天室的递增 Id
     @prop({ required: true, default: '' })
-    targetMsgId: string; // 回复消息的唯一 Id
+    targetMsgCode: string; // 回复消息的唯一 Id
 
     @prop({ required: true, default: 0 })
     status: number; // 消息状态：0，正常；1，屏蔽
 
     @prop({ required: true, default: '' })
     content: string; // 消息内容
+
+    public static async createMsg(data: PrivateMessageParam) {
+      const result = await PrivateMessageModel.findOneAndUpdate({}, {...data}, {upsert: true, new: true}).lean();
+      return result;
+    }
+
+    public static async findOneMsg(query: PrivateMessageParam) {
+      const result = await PrivateMessageModel.findOne(query).lean();
+      return result;
+    }
 }
 
 
 export const PrivateMessageModel = getModelForClass(PrivateMessage);
 
 export interface PrivateMessageType extends Pick<DocumentType<PrivateMessage>, keyof PrivateMessage> {};
+export type PrivateMessageParam = Partial<PrivateMessageType>;