libubus-sub.c

   1 /*
   2  * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include "libubus.h"
  15 #include "libubus-internal.h"
  16
  17 static int ubus_subscriber_cb(struct ubus_context *ctx, struct ubus_object *obj,
  18                          struct ubus_request_data *req,
  19                          const char *method, struct blob_attr *msg)
  20 {
  21         struct ubus_subscriber *s;
  22
  23         s = container_of(obj, struct ubus_subscriber, obj);
  24         if (s->cb)
  25                 return s->cb(ctx, obj, req, method, msg);
  26         return 0;
  27 }
  28
  29 const struct ubus_method watch_method __hidden = {
  30         .name = NULL,
  31         .handler = ubus_subscriber_cb,
  32 };
  33
  34 int ubus_register_subscriber(struct ubus_context *ctx, struct ubus_subscriber *s)
  35 {
  36         struct ubus_object *obj = &s->obj;
  37
  38         obj->methods = &watch_method;
  39         obj->n_methods = 1;
  40
  41         return ubus_add_object(ctx, obj);
  42 }
  43
  44 static int
  45 __ubus_subscribe_request(struct ubus_context *ctx, struct ubus_object *obj, uint32_t id, int type)
  46 {
  47         struct ubus_request req;
  48
  49         blob_buf_init(&b, 0);
  50         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id);
  51         blob_put_int32(&b, UBUS_ATTR_TARGET, id);
  52
  53         if (ubus_start_request(ctx, &req, b.head, type, 0) < 0)
  54                 return UBUS_STATUS_INVALID_ARGUMENT;
  55
  56         return ubus_complete_request(ctx, &req, 0);
  57
  58 }
  59
  60 int ubus_subscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id)
  61 {
  62         return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_SUBSCRIBE);
  63 }
  64
  65 int ubus_unsubscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id)
  66 {
  67         return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_UNSUBSCRIBE);
  68 }
  69