#915 add seconds since ogserver has been launched

Extend GET /stats to show the number of seconds since the ogserver started.

{
       "time": {
          "now": 1647262765,     /* Seconds since 1970 */
          "boot": 2151909        /* Seconds since boot */
	  "start" : 1647262854,, /* Seconds since 1970 */
       },
       [...]

src/core.h

@@ -3,6 +3,7 @@
 
 extern int socket_rest, socket_agent_rest;
 extern struct ev_loop *og_loop;
+extern time_t start_time;
 
 int og_socket_server_init(const char *port);
 void og_server_accept_cb(struct ev_loop *loop, struct ev_io *io, int events);

src/main.c

@@ -34,12 +34,16 @@ struct og_server_cfg ogconfig = {
 	},
 };
 
+time_t start_time;
+
 int main(int argc, char *argv[])
 {
 	char config_file[PATH_MAX + 1] = OG_SERVER_CFG_JSON;
 	struct ev_io ev_io_server_rest, ev_io_agent_rest;
 	int val;
 
+	start_time = time(NULL);
+
 	og_loop = ev_default_loop(0);
 
 	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)

src/rest.c

@@ -12,6 +12,7 @@
 #include "utils.h"
 #include "list.h"
 #include "rest.h"
+#include "core.h"
 #include "wol.h"
 #include "cfg.h"
 #include "schedule.h"
@@ -5424,6 +5425,7 @@ static int og_cmd_get_server_stats(char *buffer_reply)
 		.data = buffer_reply
 	};
 	struct sysinfo stats;
+	time_t now;
 
 	sysinfo(&stats);
 
@@ -5449,8 +5451,10 @@ static int og_cmd_get_server_stats(char *buffer_reply)
 		return -1;
 	}
 
-	json_object_set_new(time_obj, "now", json_integer(time(NULL)));
+	now = time(NULL);
+	json_object_set_new(time_obj, "now", json_integer(now));
 	json_object_set_new(time_obj, "boot", json_integer(stats.uptime));
+	json_object_set_new(time_obj, "start", json_integer(now - start_time));
 	json_object_set_new(root, "time", time_obj);
 
 	json_object_set_new(memory, "size", json_integer(stats.totalram));