docs: sync workflow progress and weekend handoff
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docs/archive/provider-system-legacy.md
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# Provider 系统开发文档
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## 当前版本功能 (v0.2.0)
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### 已完成功能
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1. **CQTAI nano 图像适配器** (`app/services/adapters/image/cqtai.py`)
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- 异步生成 + 轮询获取结果
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- 支持 nano-banana / nano-banana-pro 模型
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- 支持多种分辨率和画面比例
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- 支持图生图 (filesUrl)
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2. **密钥加密存储** (`app/services/secret_service.py`)
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- Fernet 对称加密，密钥从 SECRET_KEY 派生
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- Provider API Key 自动加密存储
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- 密钥管理 API (CRUD)
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3. **指标收集系统** (`app/services/provider_metrics.py`)
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- 调用成功率、延迟、成本统计
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- 时间窗口聚合查询
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- 已集成到 provider_router
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4. **熔断器功能** (`app/services/provider_metrics.py`)
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- 连续失败 3 次触发熔断
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- 60 秒后自动恢复尝试
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- 健康状态持久化到数据库
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5. **管理后台前端** (`app/admin_app.py`)
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- 独立端口部署 (8001)
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- Vue 3 + Tailwind CSS 单页应用
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- Provider CRUD 管理
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- 密钥管理界面
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- Basic Auth 认证
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### 配置说明
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```bash
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# 启动主应用
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uvicorn app.main:app --port 8000
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# 启动管理后台 (独立端口)
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uvicorn app.admin_app:app --port 8001
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```
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环境变量:
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```
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CQTAI_API_KEY=your-cqtai-api-key
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ENABLE_ADMIN_CONSOLE=true
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ADMIN_USERNAME=admin
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ADMIN_PASSWORD=your-secure-password
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```
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---
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## 下一版本优化计划 (v0.3.0)
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### 高优先级
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#### 1. 智能负载分流 (方案 B)
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**目标**: 主渠道压力大时自动分流到后备渠道
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**实现方案**:
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- 监控指标: 并发数、响应延迟、错误率
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- 分流阈值配置:
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```python
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class LoadBalanceConfig:
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max_concurrent: int = 10 # 并发超过此值时分流
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max_latency_ms: int = 5000 # 延迟超过此值时分流
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max_error_rate: float = 0.1 # 错误率超过 10% 时分流
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```
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- 分流策略: 加权轮询，根据健康度动态调整权重
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**涉及文件**:
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- `app/services/provider_router.py` - 添加负载均衡逻辑
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- `app/services/provider_metrics.py` - 添加并发计数器
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- `app/db/admin_models.py` - 添加 LoadBalanceConfig 模型
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#### 2. Storybook 适配器
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**目标**: 生成可翻页的分页故事书
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**实现方案**:
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- 参考 Gemini AI Story Generator 格式
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- 输出结构:
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```python
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class StorybookPage:
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page_number: int
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text: str
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image_prompt: str
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image_url: str | None
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class Storybook:
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title: str
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pages: list[StorybookPage]
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cover_url: str | None
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```
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- 集成文本 + 图像生成流水线
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**涉及文件**:
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- `app/services/adapters/storybook/` - 新建目录
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- `app/api/stories.py` - 添加 storybook 生成端点
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### 中优先级
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#### 3. 成本追踪系统
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**目标**: 记录实际消费，支持预算控制
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**实现方案**:
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- 成本记录表:
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```python
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class CostRecord:
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user_id: str
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provider_id: str
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capability: str # text/image/tts
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estimated_cost: Decimal
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actual_cost: Decimal | None
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timestamp: datetime
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```
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- 预算配置:
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```python
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class BudgetConfig:
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user_id: str
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daily_limit: Decimal
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monthly_limit: Decimal
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alert_threshold: float = 0.8 # 80% 时告警
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```
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- 超预算处理: 拒绝请求 / 降级到低成本 provider
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**涉及文件**:
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- `app/db/admin_models.py` - 添加 CostRecord, BudgetConfig
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- `app/services/cost_tracker.py` - 新建
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- `app/api/admin_providers.py` - 添加成本查询 API
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#### 4. 指标可视化
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**目标**: 管理后台展示供应商指标图表
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**实现方案**:
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- 添加指标查询 API:
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- GET /admin/metrics/summary - 汇总统计
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- GET /admin/metrics/timeline - 时间线数据
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- GET /admin/metrics/providers/{id} - 单个供应商详情
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- 前端使用 Chart.js 或 ECharts 展示
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### 低优先级
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#### 5. 多租户 Provider 配置
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**目标**: 每个租户可配置独立 provider 列表和 API Key
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**实现方案**:
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- 租户配置表:
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```python
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class TenantProviderConfig:
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tenant_id: str
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provider_type: str
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provider_ids: list[str] # 按优先级排序
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api_key_override: str | None # 加密存储
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```
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- 路由时优先使用租户配置，回退到全局配置
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#### 6. Provider 健康检查调度器
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**目标**: 定期主动检查 provider 健康状态
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**实现方案**:
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- Celery Beat 定时任务
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- 每 5 分钟检查一次所有启用的 provider
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- 更新 ProviderHealth 表
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#### 7. 适配器热加载
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**目标**: 支持运行时动态加载新适配器
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**实现方案**:
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- 适配器插件目录: `app/services/adapters/plugins/`
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- 启动时扫描并注册
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- 提供 API 触发重新扫描
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---
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## API 变更记录
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### v0.2.0 新增
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| Method | Route | Description |
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|--------|-------|-------------|
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| GET | `/admin/secrets` | 列出所有密钥名称 |
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| POST | `/admin/secrets` | 创建/更新密钥 |
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| DELETE | `/admin/secrets/{name}` | 删除密钥 |
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| GET | `/admin/secrets/{name}/verify` | 验证密钥有效性 |
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### 计划中 (v0.3.0)
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| Method | Route | Description |
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|--------|-------|-------------|
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| GET | `/admin/metrics/summary` | 指标汇总 |
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| GET | `/admin/metrics/timeline` | 时间线数据 |
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| POST | `/api/storybook/generate` | 生成分页故事书 |
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| GET | `/admin/costs` | 成本统计 |
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| POST | `/admin/budgets` | 设置预算 |
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---
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## 适配器开发指南
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### 添加新适配器
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1. 创建适配器文件:
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```python
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# app/services/adapters/image/new_provider.py
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from app.services.adapters.base import AdapterConfig, BaseAdapter
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from app.services.adapters.registry import AdapterRegistry
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@AdapterRegistry.register("image", "new_provider")
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class NewProviderAdapter(BaseAdapter[str]):
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adapter_type = "image"
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adapter_name = "new_provider"
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async def execute(self, prompt: str, **kwargs) -> str:
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# 实现生成逻辑
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pass
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async def health_check(self) -> bool:
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# 实现健康检查
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pass
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@property
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def estimated_cost(self) -> float:
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return 0.01 # USD
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```
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2. 在 `__init__.py` 中导入:
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```python
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# app/services/adapters/__init__.py
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from app.services.adapters.image import new_provider as _new_provider # noqa: F401
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```
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3. 添加配置:
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```python
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# app/core/config.py
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new_provider_api_key: str = ""
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# app/services/provider_router.py
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API_KEY_MAP["new_provider"] = "new_provider_api_key"
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```
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4. 更新 `.env.example`:
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```
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NEW_PROVIDER_API_KEY=
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```
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