1. 日志类型
1.1 类别
| 日志类型 | 说明 |
| websocketpp::log::alevel | 接入日志，默认只有debug/development日志 |
| websocketpp::log::elevel | 错误日志 |
1.2 日志策略
| 日志策略 | 备注 |
| websocketpp::log::basic | 基本日志策略，写日志到std::ostream，默认策略 |
| websocketpp::log::syslog | POSIX系统日志 |
| websocketpp::log::stub | 存根日志， |
1.3 设置函数
| 日志类型 | 函数 | 说明 |
| websocketpp::log::elevel | clear_error_channels(level) set_error_channels(level) |
level参考2.2，默认只有debug/development级别关闭 |
| websocketpp::log::alevel | clear_access_channels(level) set_access_channels(level) |
level参考2.1，默认只有debug/development级别关闭 |
2. 日志级别
2.1 错误日志级别
| Level | Description |
|---|---|
| none | Special aggregate value representing "no levels"： 关闭全部日志级别 |
| devel | Low level debugging information (warning: very chatty). Requires debug or custom config.: 低级调试信息，要求debug或custom配置 |
| library | Information about unusual system states or other minor internal library problems, less chatty than devel.: 关于系统状态或其他最小内部库问题的信息，比devel级别输出少 |
| info | Information about minor configuration problems or additional information about other warnings.: 关于最小配置问题信息或其他警告的额外信息 |
| warn | Information about important problems not severe enough to terminate connections.： 警告 |
| rerror | Recoverable error. Recovery may mean cleanly closing the connection with an appropriate error code to the remote endpoint.：可恢复的错误 |
| fatal | Unrecoverable error. This error will trigger immediate unclean termination of the connection or endpoint.: 不可恢复错误 |
| all | Special aggregate value representing "all levels": 全部日志级别 |
2.2 接入日志级别
| Level | Description |
|---|---|
| none | Special aggregate value representing "no levels"：关闭全部日志级别 |
| connect | One line for each new connection that includes a host of information including: the remote address, websocket version, requested resource, http code, remote user agent: 一行包含一条connection日志 |
| disconnect | One line for each connection that is closed. Includes closing codes and reasons：一行包含一条connect关闭日志 |
| control | One line per control message: 一行包含一条控制消息日志 |
| frame_header | One line per frame, includes the full frame header: 一行包含一帧，只包含帧头 |
| frame_payload | One line per frame, includes the full message payload (warning: lots of output for large messages): 一行包含一帧，只包含消息载荷 |
| message_header | Reserved：保留 |
| message_payload | Reserved：保留 |
| endpoint | Reserved：保留 |
| debug_handshake | Extra information about opening handshakes: 打开握手的额外信息 |
| debug_close | Extra information about closing handshakes: 关闭握手的额外信息 |
| devel | Development messages (warning: very chatty). Requires debug or custom config: development消息，要求debug或custom 配置 |
| app | Special channel for application specific logs. Not used by the library.应用定制日志 |
| all | Special aggregate value representing "all levels": 表示全部日志级别 |
来源：oschina
链接：https://my.oschina.net/u/4259287/blog/3233049