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 static void 35 ubus_auto_sub_event_handler_cb(struct ubus_context *ctx, struct ubus_event_handler *ev, 36 const char *type, struct blob_attr *msg) 37 { 38 enum { 39 EVENT_ID, 40 EVENT_PATH, 41 __EVENT_MAX 42 }; 43 44 static const struct blobmsg_policy event_policy[__EVENT_MAX] = { 45 [EVENT_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 }, 46 [EVENT_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING }, 47 }; 48 49 struct blob_attr *tb[__EVENT_MAX]; 50 struct ubus_subscriber *s; 51 const char *path; 52 int id; 53 54 blobmsg_parse(event_policy, __EVENT_MAX, tb, blob_data(msg), blob_len(msg)); 55 56 if (!tb[EVENT_ID] || !tb[EVENT_PATH]) 57 return; 58 59 path = blobmsg_get_string(tb[EVENT_PATH]); 60 id = blobmsg_get_u32(tb[EVENT_ID]); 61 62 list_for_each_entry(s, &ctx->auto_subscribers, list) 63 if (s->new_obj_cb(ctx, s, path)) 64 ubus_subscribe(ctx, s, id); 65 } 66 67 static void 68 ubus_auto_sub_lookup(struct ubus_context *ctx, struct ubus_object_data *obj, 69 void *priv) 70 { 71 struct ubus_subscriber *s = priv; 72 73 if (s->new_obj_cb(ctx, s, obj->path)) 74 ubus_subscribe(ctx, s, obj->id); 75 } 76 77 int ubus_register_subscriber(struct ubus_context *ctx, struct ubus_subscriber *s) 78 { 79 struct ubus_object *obj = &s->obj; 80 int ret; 81 82 INIT_LIST_HEAD(&s->list); 83 obj->methods = &watch_method; 84 obj->n_methods = 1; 85 86 ret = ubus_add_object(ctx, obj); 87 if (ret) 88 return ret; 89 90 if (s->new_obj_cb) { 91 struct ubus_event_handler *ev = &ctx->auto_subscribe_event_handler; 92 list_add(&s->list, &ctx->auto_subscribers); 93 ev->cb = ubus_auto_sub_event_handler_cb; 94 if (!ev->obj.id) 95 ubus_register_event_handler(ctx, ev, "ubus.object.add"); 96 ubus_lookup(ctx, NULL, ubus_auto_sub_lookup, s); 97 } 98 99 return 0; 100 } 101 102 static int 103 __ubus_subscribe_request(struct ubus_context *ctx, struct ubus_object *obj, uint32_t id, int type) 104 { 105 struct ubus_request req; 106 107 blob_buf_init(&b, 0); 108 blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id); 109 blob_put_int32(&b, UBUS_ATTR_TARGET, id); 110 111 if (ubus_start_request(ctx, &req, b.head, type, 0) < 0) 112 return UBUS_STATUS_INVALID_ARGUMENT; 113 114 return ubus_complete_request(ctx, &req, 0); 115 116 } 117 118 int ubus_subscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id) 119 { 120 return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_SUBSCRIBE); 121 } 122 123 int ubus_unsubscribe(struct ubus_context *ctx, struct ubus_subscriber *obj, uint32_t id) 124 { 125 return __ubus_subscribe_request(ctx, &obj->obj, id, UBUS_MSG_UNSUBSCRIBE); 126 } 127 128
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