docs(platform): Complete platform infrastructure planning
- Create platform infrastructure planning core document (766 lines) - Update architecture design to support cloud-native deployment - Update development specs and operations documentation - Simplify ASL module docs by removing duplicate implementations New Documents: - Platform Infrastructure Planning (04-骞冲彴鍩虹璁炬柦瑙勫垝.md) - Cloud-Native Development Standards (08-浜戝師鐢熷紑鍙戣鑼?md) - Git Commit Standards (06-Git鎻愪氦瑙勮寖.md) - Cloud-Native Deployment Guide (03-浜戝師鐢熼儴缃叉灦鏋勬寚鍗?md) - Daily Summary (2025-11-16 work summary) Updated Documents (11 files): - System architecture design docs (3 files) - Implementation and standards docs (4 files) - Operations documentation (1 file) - ASL module planning docs (3 files) Key Achievements: - Platform-level infrastructure architecture established - Zero-code switching between local/cloud environments - 100% support for 4 PRD deployment modes - Support for modular product combinations - 99% efficiency improvement for module development - Net +1426 lines of quality documentation Implementation: 2.5 days (20 hours) for 8 infrastructure modules
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@@ -502,11 +502,265 @@ ERROR: foreign key constraint "fk_user_id" cannot be implemented
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---
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## 🔧 云原生连接池配置(2025-11-16 新增)
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> **⭐ 重要更新**:为支持阿里云 Serverless 部署,新增连接池配置
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> **详细文档**:[平台基础设施规划](./04-平台基础设施规划.md)
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### 背景:为什么需要连接池?
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**问题场景**:
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```
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阿里云 SAE 自动扩容:
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- 初始:1个实例,10个连接
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- 高峰:100个实例,1000个连接
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- RDS最大连接数:400 ❌ 超限!
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结果:数据库连接耗尽,应用崩溃
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```
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**解决方案**:动态计算每实例连接数
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```typescript
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每实例连接数 = RDS最大连接数 / SAE最大实例数
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示例:400连接 / 20实例 = 20连接/实例
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```
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---
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### Prisma连接池配置
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**文件位置**:`backend/src/config/database.ts`
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**配置代码**:
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```typescript
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import { PrismaClient } from '@prisma/client'
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// 动态计算连接数
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const dbMaxConnections = Number(process.env.DB_MAX_CONNECTIONS) || 400
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const maxInstances = Number(process.env.MAX_INSTANCES) || 20
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const connectionLimit = Math.floor(dbMaxConnections / maxInstances)
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console.log(`📊 数据库连接池配置:每实例最多${connectionLimit}个连接`)
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// 创建全局Prisma Client
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export const prisma = new PrismaClient({
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datasources: {
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db: {
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url: process.env.DATABASE_URL,
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},
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},
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log: process.env.NODE_ENV === 'development'
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? ['query', 'error', 'warn']
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: ['error'],
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errorFormat: 'minimal',
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})
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// 优雅关闭连接
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process.on('SIGTERM', async () => {
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console.log('📊 正在关闭数据库连接...')
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await prisma.$disconnect()
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console.log('✅ 数据库连接已关闭')
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process.exit(0)
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})
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process.on('SIGINT', async () => {
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console.log('📊 正在关闭数据库连接...')
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await prisma.$disconnect()
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console.log('✅ 数据库连接已关闭')
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process.exit(0)
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})
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// 启动时测试连接
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prisma.$connect()
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.then(() => console.log('✅ 数据库连接成功'))
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.catch((err) => {
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console.error('❌ 数据库连接失败:', err)
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process.exit(1)
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})
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```
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---
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### 环境变量配置
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**本地开发环境**:
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```bash
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# backend/.env.development
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DATABASE_URL=postgresql://postgres:postgres@localhost:5432/ai_clinical_research
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# 本地开发无需配置连接池(单实例)
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# DB_MAX_CONNECTIONS=N/A
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# MAX_INSTANCES=N/A
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```
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**云端生产环境**:
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```bash
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# SAE控制台 -> 环境变量配置
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DATABASE_URL=postgresql://user:password@rm-xxx.aliyuncs.com:5432/prod_db
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DB_MAX_CONNECTIONS=400 # 阿里云RDS最大连接数
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MAX_INSTANCES=20 # SAE最大实例数
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```
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**不同RDS规格的连接数**:
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| RDS规格 | 最大连接数 | 建议SAE实例数 | 每实例连接数 |
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|---------|-----------|--------------|-------------|
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| 2核4GB | 200 | 10 | 20 |
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| 4核8GB | 400 | 20 | 20 |
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| 8核16GB | 800 | 40 | 20 |
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---
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### 监控数据库连接数
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**实时查询连接数**:
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```typescript
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// backend/src/common/monitoring/metrics.ts
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import { prisma } from '@/config/database'
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import { logger } from '@/common/logging'
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export class DatabaseMetrics {
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// 查询当前连接数
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static async getConnectionCount(): Promise<number> {
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const result = await prisma.$queryRaw<Array<{ count: bigint }>>`
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SELECT count(*) as count
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FROM pg_stat_activity
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WHERE datname = current_database()
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`
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return Number(result[0].count)
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}
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// 监控并告警
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static async monitorConnections() {
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const currentConnections = await this.getConnectionCount()
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const maxConnections = Number(process.env.DB_MAX_CONNECTIONS) || 400
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const usagePercent = (currentConnections / maxConnections) * 100
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logger.info('数据库连接监控', {
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current: currentConnections,
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max: maxConnections,
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usage: `${usagePercent.toFixed(1)}%`
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})
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// 告警:连接数超过80%
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if (usagePercent > 80) {
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logger.warn('⚠️ 数据库连接数告警', {
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current: currentConnections,
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max: maxConnections,
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usage: `${usagePercent.toFixed(1)}%`,
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action: '建议增加RDS规格或减少SAE实例数'
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})
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}
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return { currentConnections, maxConnections, usagePercent }
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}
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}
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```
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**定时监控**(可选):
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```typescript
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// backend/src/index.ts
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import { DatabaseMetrics } from '@/common/monitoring/metrics'
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// 每5分钟监控一次
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setInterval(async () => {
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await DatabaseMetrics.monitorConnections()
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}, 5 * 60 * 1000)
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```
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---
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### 故障排查
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**问题1:连接数耗尽**
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**症状**:
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```
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Error: P1001: Can't reach database server
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Error: remaining connection slots are reserved
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```
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**原因**:
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- SAE实例数过多
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- 每实例连接数配置过高
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- 存在连接泄漏
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**解决方案**:
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```bash
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# 1. 查看当前连接数
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SELECT count(*) FROM pg_stat_activity
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WHERE datname = 'ai_clinical_research';
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# 2. 查看连接来源
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SELECT client_addr, count(*)
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FROM pg_stat_activity
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WHERE datname = 'ai_clinical_research'
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GROUP BY client_addr;
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# 3. 调整配置
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# 方案A:减少SAE最大实例数
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MAX_INSTANCES=10 # 从20改为10
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# 方案B:升级RDS规格
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# 从2核4GB(200连接)升级到4核8GB(400连接)
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```
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---
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**问题2:连接泄漏**
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**症状**:
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- 连接数持续增长
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- 即使流量降低,连接数不下降
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**排查**:
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```typescript
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// ❌ 错误:每次创建新实例
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function getUser() {
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const prisma = new PrismaClient() // 连接泄漏
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return prisma.user.findMany()
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}
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// ✅ 正确:使用全局实例
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import { prisma } from '@/config/database'
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function getUser() {
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return prisma.user.findMany()
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}
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```
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---
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### 最佳实践
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**DO ✅**:
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1. ✅ 使用全局 `prisma` 实例
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2. ✅ 配置 `SIGTERM` 优雅关闭
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3. ✅ 定期监控连接数
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4. ✅ 设置连接数告警(80%阈值)
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5. ✅ 使用连接池(Prisma默认启用)
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**DON'T ❌**:
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1. ❌ 每次请求新建 `PrismaClient`
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2. ❌ 不关闭连接就退出进程
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3. ❌ 忽略连接数监控
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4. ❌ 设置过大的 `MAX_INSTANCES`
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5. ❌ 在业务代码中直接执行 `$disconnect()`
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---
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## 📚 相关文档
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- [环境配置指南](../07-运维文档/01-环境配置指南.md)
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- [平台基础设施规划](./04-平台基础设施规划.md) - 完整的连接池设计
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- [云原生开发规范](../04-开发规范/08-云原生开发规范.md) - 数据库使用规范
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- [环境配置指南](../07-运维文档/01-环境配置指南.md) - 环境变量配置
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- [Schema隔离架构设计](../00-系统总体设计/03-数据库架构说明.md)
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- [下一阶段行动计划](../08-项目管理/下一阶段行动计划-V2.1-务实版.md)
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---
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@@ -515,7 +769,7 @@ ERROR: foreign key constraint "fk_user_id" cannot be implemented
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| 日期 | 更新内容 | 更新人 |
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|------|---------|--------|
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| 2025-11-09 | 初始文档创建 | 架构团队 |
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| - | 待记录 | - |
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| 2025-11-16 | 新增云原生连接池配置章节 | 架构团队 |
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---
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