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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <cJSON.h>
#include <curl/curl.h>
#include <log.h>
extern CURL *ws_handle;
long last_sequence = -1;
struct timeval heartbeat_time;
void ws_send_heartbeat()
{
char buf[128] = "{\"op\":1,\"d\":null}";
if(last_sequence > 0)
snprintf(buf, 128, "{\"op\":1,\"d\":%ld}", last_sequence);
size_t sent;
curl_ws_send(ws_handle, buf, strnlen(buf, 128), &sent, 0, CURLWS_TEXT);
/* if we receive a heartbeat request from discord, we need to fix
the itimer so we don't send another one before the desired
heartbeat interval. if our itimer is off more than 2 seconds
then we fix it up and reset it */
struct itimerval itimer;
getitimer(ITIMER_REAL, &itimer);
if(itimer.it_value.tv_sec < heartbeat_time.tv_sec - 2) {
itimer.it_value = heartbeat_time;
setitimer(ITIMER_REAL, &itimer, NULL);
}
}
void ws_handle_event(cJSON *event)
{
int op = cJSON_GetObjectItem(event, "op")->valueint;
cJSON *data = cJSON_GetObjectItem(event, "d");
switch(op) {
case 1: /* Heartbeat request */
ws_send_heartbeat();
break;
case 10: ; /* Hello */
int heartbeat_wait = cJSON_GetObjectItem(data,
"heartbeat_interval")->valueint;
float jitter = (float)rand() / (RAND_MAX * 1.0f);
heartbeat_time.tv_sec = heartbeat_wait / 1000;
heartbeat_time.tv_usec = (heartbeat_wait % 1000) * 1000;
struct timeval jitter_time = {
.tv_sec = heartbeat_time.tv_sec * jitter,
.tv_usec = heartbeat_time.tv_usec * jitter,
};
struct itimerval new_itimer = {
.it_interval = heartbeat_time,
.it_value = jitter_time
};
setitimer(ITIMER_REAL, &new_itimer, NULL);
break;
case 11: /* Heartbeat ACK */
break;
default:
print(LOG_ERR "ws: received unknown WS opcode %d", op);
break;
}
}
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