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中继服务
说明：主要对中继服务进行一些基础操作，例如终端上线、保活PING、通过中继发送和接收消息等。
因为我们需要实现不依赖任何服务器的直连，所以我们的连接传输架构里面不能依赖服务器来完成连接，终端根据条件可以在没有任何服务器辅助的情况下与另一终端建立连接
中继示意图
diagram
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终端A上线
diagram
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从这里开始，无论是中继通信还是直接通信还是P2P等通信，所有的数据包格式都是《ScpMessage》
- 调用方法
使用ScpMessage协议，PayloadType为100
- 参数说明
| 名称 | 类型 | 是否必需 | 示例 | 描述 |
|---|---|---|---|---|
| payload | null | Y | null | 请求结构体为空 |
说明：
- ScpMessage的FromPeerId是自己的peerID
- ScpMessage的ToPeerId是中继节点的peerID
- 返回说明
| 名称 | 类型 | 描述 |
|---|---|---|
| ResponseType | uint8 | 登录响应类型，2字节无符号，常量：110-OK, 120-REJECT |
| RejectType | uint8 | 拒绝类型，1字节，常量暂未定义 |
| nextPingTime | uint16 | 下次ping时间秒数，2字节无符号 |
| ClientAddr | string | 客户端地址 |
- 返回示例
响应结构体：
go
type LoginResponse struct {
//登录响应类型 2字节无符号 常量：110-OK, 120-REJECT
ResponseType uint8
// 拒绝类型 常量暂未定义 1字节
RejectType uint8
// 下次ping时间秒数 2字节无符号
nextPingTime uint16
// 客户端地址
ClientAddr string
}响应结构体序列化和反序列化方式：
go
// 序列化
m.WriteUint8(response.ResponseType)
m.WriteUint8(response.RejectType)
m.WriteUint16(response.nextPingTime)
m.WriteString(response.ClientAddr, 0)
// 反序列化
ResponseType: m.ParseByte(0),
RejectType: m.ParseByte(1),
NextPingTime: m.ParseUint16(2),
ClientAddr: m.ParseString(4, 0),注意：中继上线和ping，ScpMessage的FromPeerId是自己的peerID，ToPeerId是中继节点的peerID
保活PING
按照登录响应中的nextPingTime间隔后向中继服务器发送ping
- 调用方法
使用ScpMessage协议，PayloadType为110
- 参数说明
| 名称 | 类型 | 是否必需 | 示例 | 描述 |
|---|---|---|---|---|
| payload | null | Y | null | 请求结构体为空 |
- 返回说明
| 名称 | 类型 | 描述 |
|---|---|---|
| StatusCode | uint8 | 状态码，1字节无符号，0-OK，1-需要重新上线 |
| NextPingTime | uint16 | 下次ping时间秒数，2字节无符号 |
| ClientAddr | string | 客户端地址 |
- 返回示例
响应结构体：
go
type HeartbeatResponse struct {
// 状态码 1字节无符号
// 0-OK， 1-需要重新上线
StatusCode uint8
// 下次ping时间秒数 2字节无符号
NextPingTime uint16
// 客户端地址
ClientAddr string
}响应结构体序列化和反序列化方式：
go
// 序列化
m.WriteUint8(response.StatusCode)
m.WriteUint16(response.NextPingTime)
m.WriteString(response.ClientAddr, 0)
// 反序列化
StatusCode: m.ParseByte(0),
NextPingTime: m.ParseUint16(1),
ClientAddr: m.ParseString(3, 0),心跳响应状态：
go
// HeartbeatResponseStatusOK OK
HeartbeatResponseStatusOK uint8 = 0
// HeartbeatResponseStatusReLogin 需要重新上线
HeartbeatResponseStatusReLogin uint8 = 1重要说明：
- 下次ping时间应该遵循HeartbeatResponse的nextPingTime，而不是登陆时的。
- 如果遇到HeartbeatResponseStatus不为OK:
- 对于网关设备：重启程序
- 对于APP：从第一步查询中继服务器重新开始流程
- 因为路由器上的端口会回收，外网地址也会周期变化（一般是24小时）如果ClientAddr地址发生变化，在打洞时需要使用心跳得到的最新外部地址（ClientAddr），否则P2P不会成功
通过中继向其他终端发送消息
除了登录和心跳包，中继收到的其他PayloadType都会试图将其转发，转发成功或失败不会有任何响应，应该由对端响应，发送方应该按照直连方式进行超时处理。
- 调用方法
使用ScpMessage协议，PayloadType为业务消息类型
- 参数说明
| 名称 | 类型 | 是否必需 | 示例 | 描述 |
|---|---|---|---|---|
| payload | 业务消息 | Y | 见业务协议 | 业务消息内容 |
说明：
- ScpMessage的FromPeerId是自己的peerID
- ScpMessage的ToPeerId是目标终端的peerID
- 返回说明
中继转发消息不会返回响应，应该由对端响应，发送方应该按照直连方式进行超时处理。
通过中继接收来自其他终端的消息
除了登录和心跳包，中继发来的任何消息都是转发来的消息，按业务包逻辑处理即可。
- 调用方法
接收来自中继的ScpMessage消息
- 参数说明
| 名称 | 类型 | 是否必需 | 示例 | 描述 |
|---|---|---|---|---|
| ScpMessage | object | Y | 见ScpMessage协议 | 来自中继的消息 |
说明：
- 除了登录和心跳包（PayloadType 100和110），中继发来的任何消息都是转发来的消息
- 按业务包逻辑处理即可