libwebsocket心跳检测api
时间: 2023-07-25 11:09:20 浏览: 263
libwebsocket是一个轻量级的C库,用于实现WebSocket协议。它不提供心跳检测的API,但是你可以在应用程序中使用定时器来定期发送心跳消息。
以下是一个示例代码,用于在libwebsocket应用程序中发送心跳消息:
```c
#include <libwebsockets.h>
#define HEARTBEAT_INTERVAL 10 // 心跳间隔(秒)
static int callback_heartbeat(struct lws *wsi)
{
char heartbeat_msg[] = "heartbeat";
int len = strlen(heartbeat_msg);
lws_write(wsi, heartbeat_msg, len, LWS_WRITE_TEXT);
return 0;
}
static int callback_ws(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
switch (reason) {
case LWS_CALLBACK_ESTABLISHED:
// WebSocket连接建立
lws_set_timer_usecs(wsi, HEARTBEAT_INTERVAL * 1000000); // 启动心跳定时器
break;
case LWS_CALLBACK_TIMER:
// 定时器超时
callback_heartbeat(wsi); // 发送心跳消息
lws_set_timer_usecs(wsi, HEARTBEAT_INTERVAL * 1000000); // 重新启动心跳定时器
break;
default:
break;
}
return 0;
}
```
在这个示例中,我们利用libwebsocket提供的定时器API `lws_set_timer_usecs` 来实现心跳机制。在WebSocket连接建立时,我们启动一个定时器,并设置定时器超时时间为心跳间隔。当定时器超时时,我们调用 `callback_heartbeat` 函数向服务器发送心跳消息,并重新启动定时器。
注意:心跳间隔的时间应该根据实际情况进行调整,以达到合适的性能和稳定性。
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