Controller: partial retrieving of configuration.

src/nxt_conf.h

@@ -18,6 +18,8 @@ typedef struct {
 } nxt_conf_json_pretty_t;
 
 
+nxt_conf_json_value_t *nxt_conf_json_value_get(nxt_conf_json_value_t *value,
+    nxt_str_t *path);
 nxt_conf_json_value_t *nxt_conf_json_parse(u_char *pos, size_t length,
     nxt_mem_pool_t *pool);
 uintptr_t nxt_conf_json_print_value(u_char *pos, nxt_conf_json_value_t *value,

src/nxt_conf_json.c

@@ -50,10 +50,8 @@ static nxt_int_t nxt_conf_json_object_hash_test(nxt_lvlhsh_query_t *lhq,
     void *data);
 static nxt_int_t nxt_conf_json_object_member_add(nxt_lvlhsh_t *lvlhsh,
     nxt_conf_json_obj_member_t *member, nxt_mem_pool_t *pool);
-#if 0
 static nxt_conf_json_value_t *nxt_conf_json_object_member_get(
     nxt_lvlhsh_t *lvlhsh, u_char *name, size_t length);
-#endif
 
 
 static u_char *nxt_conf_json_skip_space(u_char *pos, u_char *end);
@@ -159,7 +157,6 @@ nxt_conf_json_object_member_add(nxt_lvlhsh_t *lvlhsh,
 }
 
 
-#if 0
 static nxt_conf_json_value_t *
 nxt_conf_json_object_member_get(nxt_lvlhsh_t *lvlhsh, u_char *name,
     size_t length)
@@ -179,7 +176,42 @@ nxt_conf_json_object_member_get(nxt_lvlhsh_t *lvlhsh, u_char *name,
 
     return NULL;
 }
-#endif
+
+
+nxt_conf_json_value_t *
+nxt_conf_json_value_get(nxt_conf_json_value_t *value, nxt_str_t *path)
+{
+    u_char  *p, *start, *end;
+
+    p = path->start;
+    end = p + path->length;
+
+    if (p != end && end[-1] == '/') {
+        end--;
+    }
+
+    while (p != end) {
+        start = p + 1;
+        p = start;
+
+        while (p != end && *p != '/') {
+            p++;
+        }
+
+        if (value->type != NXT_CONF_JSON_OBJECT) {
+            return NULL;
+        }
+
+        value = nxt_conf_json_object_member_get(value->u.object, start,
+                                                p - start);
+
+        if (value == NULL) {
+            return NULL;
+        }
+    }
+
+    return value;
+}
 
 
 nxt_conf_json_value_t *

src/nxt_controller.c

@@ -554,13 +554,34 @@ static void
 nxt_controller_process_request(nxt_task_t *task, nxt_event_conn_t *c,
     nxt_controller_request_t *req)
 {
+    nxt_str_t                  path;
+    nxt_conf_json_value_t      *value;
     nxt_controller_response_t  resp;
 
     nxt_memzero(&resp, sizeof(nxt_controller_response_t));
 
     if (nxt_str_eq(&req->parser.method, "GET", 3)) {
-        nxt_str_set(&resp.status_line, "200 OK");
-        resp.json_value = nxt_controller_conf.root;
+
+        path.start = req->parser.target_start;
+
+        if (req->parser.args_start != NULL) {
+            path.length = req->parser.args_start - path.start;
+
+        } else {
+            path.length = req->parser.target_end - path.start;
+        }
+
+        value = nxt_conf_json_value_get(nxt_controller_conf.root, &path);
+
+        if (value != NULL) {
+            nxt_str_set(&resp.status_line, "200 OK");
+            resp.json_value = value;
+
+        } else {
+            nxt_str_set(&resp.status_line, "404 Not Found");
+            nxt_str_set(&resp.json_string,
+                        "{ \"error\": \"Requested value doesn't exist\" }");
+        }
 
     } else if (nxt_str_eq(&req->parser.method, "PUT", 3)) {