初始化游戏小组管理系统后端项目
- 基于 NestJS + TypeScript + MySQL + Redis 架构 - 完整的模块化设计（认证、用户、小组、游戏、预约等） - JWT 认证和 RBAC 权限控制系统 - Docker 容器化部署支持 - 添加 CLAUDE.md 项目开发指南 - 配置 .gitignore 忽略文件 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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UGREEN USER
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src/modules/bets/bets.service.ts
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302
src/modules/bets/bets.service.ts
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import {
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Injectable,
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NotFoundException,
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BadRequestException,
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ForbiddenException,
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} from '@nestjs/common';
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import { InjectRepository } from '@nestjs/typeorm';
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import { Repository, DataSource } from 'typeorm';
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import { Bet } from '../../entities/bet.entity';
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import { Appointment } from '../../entities/appointment.entity';
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import { Point } from '../../entities/point.entity';
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import { GroupMember } from '../../entities/group-member.entity';
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import { CreateBetDto, SettleBetDto } from './dto/bet.dto';
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import { BetStatus, GroupMemberRole, AppointmentStatus } from '../../common/enums';
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import { ErrorCode, ErrorMessage } from '../../common/interfaces/response.interface';
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@Injectable()
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export class BetsService {
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constructor(
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@InjectRepository(Bet)
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private betRepository: Repository<Bet>,
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@InjectRepository(Appointment)
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private appointmentRepository: Repository<Appointment>,
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@InjectRepository(Point)
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private pointRepository: Repository<Point>,
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@InjectRepository(GroupMember)
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private groupMemberRepository: Repository<GroupMember>,
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private dataSource: DataSource,
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) {}
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/**
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* 创建竞猜下注
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*/
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async create(userId: string, createDto: CreateBetDto) {
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const { appointmentId, amount, betOption } = createDto;
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// 使用事务确保数据一致性
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const queryRunner = this.dataSource.createQueryRunner();
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await queryRunner.connect();
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await queryRunner.startTransaction();
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try {
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// 验证预约存在
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const appointment = await queryRunner.manager.findOne(Appointment, {
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where: { id: appointmentId },
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});
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if (!appointment) {
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throw new NotFoundException({
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code: ErrorCode.APPOINTMENT_NOT_FOUND,
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message: ErrorMessage[ErrorCode.APPOINTMENT_NOT_FOUND],
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});
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}
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// 验证预约状态
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if (appointment.status !== AppointmentStatus.PENDING) {
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throw new BadRequestException({
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code: ErrorCode.INVALID_OPERATION,
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message: '预约已结束，无法下注',
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});
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}
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// 验证用户积分是否足够
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const balance = await queryRunner.manager
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.createQueryBuilder(Point, 'point')
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.select('SUM(point.amount)', 'total')
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.where('point.userId = :userId', { userId })
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.andWhere('point.groupId = :groupId', { groupId: appointment.groupId })
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.getRawOne();
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const currentBalance = parseInt(balance.total || '0');
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if (currentBalance < amount) {
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throw new BadRequestException({
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code: ErrorCode.INSUFFICIENT_POINTS,
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message: '积分不足',
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});
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}
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// 检查是否已下注
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const existingBet = await queryRunner.manager.findOne(Bet, {
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where: { appointmentId, userId },
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});
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if (existingBet) {
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throw new BadRequestException({
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code: ErrorCode.INVALID_OPERATION,
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message: '已下注，不能重复下注',
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});
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}
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const bet = queryRunner.manager.create(Bet, {
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appointmentId,
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userId,
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betOption,
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amount,
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});
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const savedBet = await queryRunner.manager.save(Bet, bet);
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// 扣除积分
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const pointRecord = queryRunner.manager.create(Point, {
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userId,
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groupId: appointment.groupId,
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amount: -amount,
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reason: '竞猜下注',
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description: `预约: ${appointment.title}`,
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relatedId: savedBet.id,
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});
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await queryRunner.manager.save(Point, pointRecord);
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await queryRunner.commitTransaction();
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return savedBet;
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} catch (error) {
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await queryRunner.rollbackTransaction();
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throw error;
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} finally {
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await queryRunner.release();
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}
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}
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/**
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* 查询预约的所有竞猜
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*/
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async findAll(appointmentId: string) {
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const bets = await this.betRepository.find({
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where: { appointmentId },
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relations: ['user'],
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order: { createdAt: 'DESC' },
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});
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// 统计各选项的下注情况
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const stats = bets.reduce((acc, bet) => {
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if (!acc[bet.betOption]) {
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acc[bet.betOption] = { count: 0, totalAmount: 0 };
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}
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acc[bet.betOption].count++;
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acc[bet.betOption].totalAmount += bet.amount;
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return acc;
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}, {});
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return {
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bets,
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stats,
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totalBets: bets.length,
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totalAmount: bets.reduce((sum, bet) => sum + bet.amount, 0),
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};
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}
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/**
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* 结算竞猜（管理员）
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*/
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async settle(userId: string, appointmentId: string, settleDto: SettleBetDto) {
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const { winningOption } = settleDto;
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// 验证预约存在
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const appointment = await this.appointmentRepository.findOne({
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where: { id: appointmentId },
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});
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if (!appointment) {
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throw new NotFoundException({
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code: ErrorCode.APPOINTMENT_NOT_FOUND,
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message: ErrorMessage[ErrorCode.APPOINTMENT_NOT_FOUND],
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});
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}
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// 验证权限
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const membership = await this.groupMemberRepository.findOne({
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where: { groupId: appointment.groupId, userId },
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});
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if (!membership || (membership.role !== GroupMemberRole.ADMIN && membership.role !== GroupMemberRole.OWNER)) {
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throw new ForbiddenException({
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code: ErrorCode.NO_PERMISSION,
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message: '需要管理员权限',
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});
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}
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// 使用事务确保数据一致性
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const queryRunner = this.dataSource.createQueryRunner();
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await queryRunner.connect();
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await queryRunner.startTransaction();
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try {
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// 获取所有下注
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const bets = await queryRunner.manager.find(Bet, {
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where: { appointmentId },
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});
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// 计算总奖池和赢家总下注
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const totalPool = bets.reduce((sum, bet) => sum + bet.amount, 0);
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const winningBets = bets.filter((bet) => bet.betOption === winningOption);
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const winningTotal = winningBets.reduce((sum, bet) => sum + bet.amount, 0);
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if (winningTotal === 0) {
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throw new BadRequestException({
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code: ErrorCode.INVALID_OPERATION,
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message: '没有人下注该选项',
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});
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}
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// 按比例分配奖池，修复精度损失问题
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let distributedAmount = 0;
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for (let i = 0; i < winningBets.length; i++) {
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const bet = winningBets[i];
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let winAmount: number;
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if (i === winningBets.length - 1) {
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// 最后一个赢家获得剩余所有积分，避免精度损失
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winAmount = totalPool - distributedAmount;
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} else {
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winAmount = Math.floor((bet.amount / winningTotal) * totalPool);
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distributedAmount += winAmount;
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}
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bet.winAmount = winAmount;
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bet.status = BetStatus.WON;
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// 返还积分
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const pointRecord = queryRunner.manager.create(Point, {
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userId: bet.userId,
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groupId: appointment.groupId,
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amount: winAmount,
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reason: '竞猜获胜',
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description: `预约: ${appointment.title}`,
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relatedId: bet.id,
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});
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await queryRunner.manager.save(Point, pointRecord);
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await queryRunner.manager.save(Bet, bet);
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}
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// 更新输家状态
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for (const bet of bets) {
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if (bet.betOption !== winningOption) {
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bet.status = BetStatus.LOST;
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await queryRunner.manager.save(Bet, bet);
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}
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}
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await queryRunner.commitTransaction();
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return {
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message: '结算成功',
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winningOption,
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totalPool,
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winners: winningBets.length,
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};
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} catch (error) {
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await queryRunner.rollbackTransaction();
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throw error;
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} finally {
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await queryRunner.release();
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}
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}
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/**
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* 取消竞猜（预约取消时）
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*/
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async cancel(appointmentId: string) {
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// 使用事务确保数据一致性
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const queryRunner = this.dataSource.createQueryRunner();
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await queryRunner.connect();
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await queryRunner.startTransaction();
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try {
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const bets = await queryRunner.manager.find(Bet, {
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where: { appointmentId },
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relations: ['appointment'],
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});
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for (const bet of bets) {
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if (bet.status === BetStatus.PENDING) {
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bet.status = BetStatus.CANCELLED;
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await queryRunner.manager.save(Bet, bet);
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// 退还积分
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const pointRecord = queryRunner.manager.create(Point, {
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userId: bet.userId,
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groupId: bet.appointment.groupId,
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amount: bet.amount,
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reason: '竞猜取消退款',
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description: `预约: ${bet.appointment.title}`,
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relatedId: bet.id,
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});
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await queryRunner.manager.save(Point, pointRecord);
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}
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}
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await queryRunner.commitTransaction();
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return { message: '竞猜已取消，积分已退还' };
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} catch (error) {
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await queryRunner.rollbackTransaction();
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throw error;
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} finally {
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await queryRunner.release();
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}
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}
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}
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