# Redis Connection Capability Specification

## Overview
This specification defines the Redis connection capability for the BLS Project Console, which manages the connection between the system and the Redis server for reading logs and sending commands.

## Requirements

### Requirement: Redis Connection Establishment
The system SHALL establish a connection to the Redis server.

#### Scenario: Establishing Redis connection on server start
- **WHEN** the server starts
- **THEN** it SHALL attempt to connect to the Redis server
- **AND** it SHALL log the connection status

### Requirement: Redis Connection Configuration
The system SHALL allow configuration of Redis connection parameters.

#### Scenario: Configuring Redis connection via environment variables
- **WHEN** the server starts with Redis environment variables set
- **THEN** it SHALL use those variables to configure the Redis connection
- **AND** it SHALL override default values

### Requirement: Redis Connection Reconnection
The system SHALL automatically reconnect to Redis if the connection is lost.

#### Scenario: Reconnecting to Redis after connection loss
- **WHEN** the Redis connection is lost
- **THEN** the system SHALL attempt to reconnect with exponential backoff
- **AND** it SHALL log each reconnection attempt
- **AND** it SHALL notify the user when connection is restored

### Requirement: Redis Connection Error Handling
The system SHALL handle Redis connection errors gracefully.

#### Scenario: Handling Redis connection failure
- **WHEN** the system fails to connect to Redis
- **THEN** it SHALL log the error
- **AND** it SHALL display an error message to the user
- **AND** it SHALL continue attempting to reconnect

### Requirement: Redis Connection Monitoring
The system SHALL monitor the Redis connection status.

#### Scenario: Monitoring Redis connection status
- **WHEN** the Redis connection status changes
- **THEN** the system SHALL update the connection status in the UI
- **AND** it SHALL log the status change

## Data Model

### Redis Connection Configuration
```json
{
  "host": "string",
  "port": "number",
  "password": "string",
  "db": "number",
  "socket": {
    "reconnectStrategy": "function",
    "connectTimeout": "number",
    "keepAlive": "number"
  }
}
```

### Redis Connection Status
```json
{
  "status": "string", // e.g., connecting, connected, disconnected, error
  "lastConnectedAt": "ISO-8601 string",
  "lastDisconnectedAt": "ISO-8601 string",
  "error": "string" // optional error message
}
```

## API Endpoints

### GET /api/redis/status
- **Description**: Get Redis connection status
- **Response**:
  ```json
  {
    "status": "string",
    "lastConnectedAt": "ISO-8601 string",
    "lastDisconnectedAt": "ISO-8601 string",
    "error": "string"
  }
  ```

### POST /api/redis/reconnect
- **Description**: Manually reconnect to Redis
- **Response**:
  ```json
  {
    "success": true,
    "message": "Reconnection attempt initiated"
  }
  ```

### GET /api/projects
- **Description**: Get list of all projects from Redis
- **Response**:
  ```json
  {
    "success": true,
    "projects": [
      {
        "id": "string",
        "name": "string",
        "apiBaseUrl": "string",
        "lastActiveAt": "number",
        "status": "online|offline|unknown",
        "isOnline": "boolean",
        "ageMs": "number"
      }
    ],
    "count": 10
  }
  ```

### POST /api/projects/migrate
- **Description**: Migrate heartbeat data from old structure to new unified structure
- **Request Body**:
  ```json
  {
    "deleteOldKeys": false,
    "dryRun": false
  }
  ```
- **Response**:
  ```json
  {
    "success": true,
    "message": "数据迁移完成",
    "migrated": 5,
    "projects": [...],
    "listKey": "项目心跳",
    "deleteOldKeys": false
  }
  ```