111 lines
3.2 KiB
Markdown
111 lines
3.2 KiB
Markdown
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# softbus_transport
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**路径：** `src/softbus_transport`
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**构建目标：** `softbus_transport`（STATIC 库）
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**层级：** L2 服务层
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## 1. 概述
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`softbus_transport` 实现边缘与守护进程之间的 **TCP 传输层**，定义 UplinkWire JSON 行协议，提供 Server（守护进程监听）与 Client（边缘连接）对称实现。
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## 2. CONSTRAINTS
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- 传输层仅负责 TCP 连接管理与线消息编解码，不包含业务解析逻辑。
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- 消息格式遵循 [UPLINK_WIRE_PROTOCOL.md](UPLINK_WIRE_PROTOCOL.md)，不得引入私有扩展字段而不更新协议文档。
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- Server 与 Client 均基于 asio 异步 I/O，不得阻塞调用线程。
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- 传输层不得直接操作 OPC UA 或插件。
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## 3. 核心组件
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### 3.1 UplinkWire — 线协议
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| 类型/函数 | 说明 |
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|-----------|------|
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| `WireMessageType` | 枚举：`RawPacket`、`ExecuteCommand`、`Unknown` |
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| `WireMessage` | 解码结果联合体 |
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| `encodeWireMessage(RawPacket)` | 上行编码 |
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| `encodeWireMessage(ExecuteCommand)` | 下行编码 |
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| `decodeWireMessage(line)` | 单行解码 |
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| `base64Encode` / `base64Decode` | payload 编解码 |
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### 3.2 TcpUplinkServer — 守护进程侧
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| 方法 | 说明 |
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|------|------|
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| `TcpUplinkServer(io_context, host, port)` | 构造，绑定监听地址 |
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| `start()` | 启动 acceptor |
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| `stop()` | 停止服务 |
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| `setRawPacketHandler(handler)` | 注册上行回调 `function<void(RawPacket)>` |
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| `sendCommand(ExecuteCommand)` | 向已连接边缘发送下行命令 |
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**行为：**
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- 监听 TCP 端口，接受边缘连接
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- 按 `\n` 分行读取，解码 `rawPacket` 消息
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- 触发 `rawHandler` 回调
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- 通过 `sendCommand` 向边缘推送 `executeCommand`
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### 3.3 TcpUplinkClient — 边缘侧
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| 方法 | 说明 |
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|------|------|
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| `TcpUplinkClient(io_context, host, port)` | 构造，指定守护进程地址 |
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| `connect()` | 连接守护进程 |
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| `disconnect()` | 断开连接 |
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| `sendRawPacket(RawPacket)` | 发送上行原始包 |
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| `poll()` | 轮询接收下行命令 |
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| `setCommandHandler(handler)` | 注册命令回调 `function<void(ExecuteCommand)>` |
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## 4. 数据流
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### 4.1 上行
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```
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Edge: UplinkClient.sendRawPacket(packet)
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→ encodeWireMessage(packet) + "\n"
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→ TCP send
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→ Server: handleLine(line)
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→ decodeWireMessage(line)
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→ rawHandler(rawPacket)
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```
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### 4.2 下行
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```
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Daemon: CommandDispatcher.dispatch(cmd)
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→ TcpUplinkServer.sendCommand(cmd)
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→ encodeWireMessage(cmd) + "\n"
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→ TCP send
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→ Client: handleLine(line)
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→ decodeWireMessage(line)
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→ commandHandler(cmd)
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```
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## 5. 配置
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| 配置项 | 来源 | 默认值 |
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|--------|------|--------|
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| `uplink.listenHost` | `daemon_profile.json` | `127.0.0.1` |
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| `uplink.listenPort` | `daemon_profile.json` | `9000` |
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| Edge 连接地址 | CLI `--daemon host:port` | `127.0.0.1:9000` |
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## 6. 依赖
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- `softbus_core`（RawPacket）
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- `softbus_api`（ExecuteCommand）
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- `asio`（FetchContent standalone，v1.30.2）
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- **被依赖：** softbus_edge, softbus_daemon
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## 7. 构建
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```cmake
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add_library(softbus_transport STATIC ...)
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target_link_libraries(softbus_transport PUBLIC softbus_core softbus_api asio)
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```
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## 8. Phase 2 规划
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- 支持多边缘连接与连接池
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- 增加断线重连与心跳机制
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- 可选迁移至 SBUP 二进制协议
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