Add unit section to status endpoint

Added unit section to /status endpoint. Unit section is about web-server version, config last load time and config update generation
Response example below:
{"unit":{"version":"1.32.0","load_time":"2024-01-25T13:24:08.000Z","generation":0},"connections":{"accepted":0,"active":0,"idle":0,"closed":0},"requests":{"total":0},"applications":{"laravel":{"processes":{"running":1,"starting":0,"idle":1},"requests":{"active":0}}}}
Closes: #928

src/nxt_controller.c

@@ -11,8 +11,6 @@
 #include <nxt_conf.h>
 #include <nxt_status.h>
 #include <nxt_cert.h>
-#include <nxt_script.h>
-
 
 typedef struct {
     nxt_conf_value_t  *root;
@@ -1633,7 +1631,7 @@ nxt_controller_status_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg,
     req = data;
 
     if (msg->port_msg.type == NXT_PORT_MSG_RPC_READY) {
-        status = nxt_status_get((nxt_status_report_t *) msg->buf->mem.pos,
+        status = nxt_status_get(task, (nxt_status_report_t *) msg->buf->mem.pos,
                                 req->conn->mem_pool);
     } else {
         status = NULL;
@@ -2432,6 +2430,9 @@ nxt_controller_conf_store(nxt_task_t *task, nxt_conf_value_t *conf)
     nxt_buf_t      *b;
     nxt_port_t     *main_port;
     nxt_runtime_t  *rt;
+    time_t         rawtime;
+    u_char         buffer[25];
+    struct         tm *timeinfo;
 
     rt = task->thread->runtime;
 
@@ -2466,6 +2467,17 @@ nxt_controller_conf_store(nxt_task_t *task, nxt_conf_value_t *conf)
                                 NXT_PORT_MSG_CONF_STORE | NXT_PORT_MSG_CLOSE_FD,
                                  fd, 0, -1, b);
 
+    rt->conf_gen++;
+
+    time(&rawtime);
+    timeinfo = gmtime(&rawtime);  //convert to UTC
+    strftime((char*)buffer, 25, "%Y-%m-%dT%H:%M:%S.000Z", timeinfo);
+
+    rt->conf_ltime.length = nxt_strlen(buffer);
+    rt->conf_ltime.start = nxt_malloc(rt->conf_ltime.length + 1);
+
+    nxt_cpystr(rt->conf_ltime.start, buffer);
+
     return;
 
 fail:

src/nxt_runtime.c

@@ -777,6 +777,9 @@ nxt_runtime_conf_init(nxt_task_t *task, nxt_runtime_t *rt)
     nxt_sockaddr_t               *sa;
     nxt_file_name_str_t          file_name;
     const nxt_event_interface_t  *interface;
+    time_t                       rawtime;
+    u_char                       buffer[25];
+    struct                       tm *timeinfo;
 
     rt->daemon = 1;
     rt->engine_connections = 256;
@@ -789,6 +792,16 @@ nxt_runtime_conf_init(nxt_task_t *task, nxt_runtime_t *rt)
     rt->state = NXT_STATEDIR;
     rt->control = NXT_CONTROL_SOCK;
     rt->tmp = NXT_TMPDIR;
+    rt->conf_gen = 0;
+
+    time(&rawtime);
+    timeinfo = gmtime(&rawtime);  //convert to UTC
+    strftime((char*)buffer, 25, "%Y-%m-%dT%H:%M:%S.000Z", timeinfo);
+
+    rt->conf_ltime.length = nxt_strlen(buffer);
+    rt->conf_ltime.start = nxt_malloc(rt->conf_ltime.length + 1);
+
+    nxt_cpystr(rt->conf_ltime.start, buffer);
 
     nxt_memzero(&rt->capabilities, sizeof(nxt_capabilities_t));
 

src/nxt_runtime.h

@@ -73,6 +73,9 @@ struct nxt_runtime_s {
     const char             *control;
     const char             *tmp;
 
+    nxt_int_t              conf_gen;
+    nxt_str_t              conf_ltime;
+
     nxt_str_t              certs;
     nxt_str_t              scripts;
 

src/nxt_status.c

@@ -9,14 +9,20 @@
 
 
 nxt_conf_value_t *
-nxt_status_get(nxt_status_report_t *report, nxt_mp_t *mp)
+nxt_status_get(nxt_task_t *task, nxt_status_report_t *report, nxt_mp_t *mp)
 {
     size_t            i;
-    nxt_str_t         name;
+    nxt_runtime_t     *rt;
     nxt_int_t         ret;
+    nxt_str_t         name;
     nxt_status_app_t  *app;
+    nxt_str_t         version;
     nxt_conf_value_t  *status, *obj, *apps, *app_obj;
 
+    static nxt_str_t unit_str = nxt_string("unit");
+    static nxt_str_t ver_str = nxt_string("version");
+    static nxt_str_t gen_str = nxt_string("generation");
+    static nxt_str_t lconf_str = nxt_string("last_configured");
     static nxt_str_t conns_str = nxt_string("connections");
     static nxt_str_t acc_str = nxt_string("accepted");
     static nxt_str_t active_str = nxt_string("active");
@@ -29,17 +35,31 @@ nxt_status_get(nxt_status_report_t *report, nxt_mp_t *mp)
     static nxt_str_t run_str = nxt_string("running");
     static nxt_str_t start_str = nxt_string("starting");
 
-    status = nxt_conf_create_object(mp, 3);
+    rt = task->thread->runtime;
+
+    status = nxt_conf_create_object(mp, 4);
     if (nxt_slow_path(status == NULL)) {
         return NULL;
     }
 
+    obj = nxt_conf_create_object(mp, 3);
+    if (nxt_slow_path(obj == NULL)) {
+        return NULL;
+    }
+
+    nxt_conf_set_member(status, &unit_str, obj, 0);
+
+    nxt_str_set(&version, NXT_VERSION);
+    nxt_conf_set_member_string(obj, &ver_str, &version, 0);
+    nxt_conf_set_member_string(obj, &lconf_str, &rt->conf_ltime, 1);
+    nxt_conf_set_member_integer(obj, &gen_str,  rt->conf_gen, 2);
+
     obj = nxt_conf_create_object(mp, 4);
     if (nxt_slow_path(obj == NULL)) {
         return NULL;
     }
 
-    nxt_conf_set_member(status, &conns_str, obj, 0);
+    nxt_conf_set_member(status, &conns_str, obj, 1);
 
     nxt_conf_set_member_integer(obj, &acc_str, report->accepted_conns, 0);
     nxt_conf_set_member_integer(obj, &active_str, report->accepted_conns
@@ -53,7 +73,7 @@ nxt_status_get(nxt_status_report_t *report, nxt_mp_t *mp)
         return NULL;
     }
 
-    nxt_conf_set_member(status, &reqs_str, obj, 1);
+    nxt_conf_set_member(status, &reqs_str, obj, 2);
 
     nxt_conf_set_member_integer(obj, &total_str, report->requests, 0);
 
@@ -62,7 +82,7 @@ nxt_status_get(nxt_status_report_t *report, nxt_mp_t *mp)
         return NULL;
     }
 
-    nxt_conf_set_member(status, &apps_str, apps, 2);
+    nxt_conf_set_member(status, &apps_str, apps, 3);
 
     for (i = 0; i < report->apps_count; i++) {
         app = &report->apps[i];

src/nxt_status.h

@@ -27,7 +27,7 @@ typedef struct {
 } nxt_status_report_t;
 
 
-nxt_conf_value_t *nxt_status_get(nxt_status_report_t *report, nxt_mp_t *mp);
+nxt_conf_value_t *nxt_status_get(nxt_task_t *task, nxt_status_report_t *report, nxt_mp_t *mp);
 
 
 #endif /* _NXT_STATUS_H_INCLUDED_ */