add functionality for registering anonymous objects as event listeners

[project/ubus.git] / ubusd_event.c

diff --git a/ubusd_event.c b/ubusd_event.c
index da0aed8..3396ebf 100644 (file)
--- a/ubusd_event.c
+++ b/ubusd_event.c
@@ -1,41 +1,140 @@
 #include "ubusd.h"
 
 static struct avl_tree patterns;
+static LIST_HEAD(catch_all);
 static struct ubus_object *event_obj;
 
-struct event_pattern {
-       struct avl_node avl;
+enum evs_type {
+       EVS_PATTERN,
+       EVS_CATCHALL
+};
 
+struct event_source {
+       struct list_head list;
        struct ubus_object *obj;
+       enum evs_type type;
+       union {
+               struct {
+                       struct avl_node avl;
+               } pattern;
+               struct {
+                       struct list_head list;
+               } catchall;
+       };
+};
+
+struct event_pattern {
+       struct event_source evs;
        struct list_head list;
+};
+
+struct event_catchall {
+       struct event_source evs;
 
-       const char *path;
+       struct list_head list;
+       struct ubus_object *obj;
 };
 
-static void ubusd_delete_event_pattern(struct event_pattern *ev)
+static void ubusd_delete_event_source(struct event_source *evs)
 {
-       list_del(&ev->list);
-       avl_delete(&patterns, &ev->avl);
-       free(ev);
+       list_del(&evs->list);
+       switch (evs->type) {
+       case EVS_PATTERN:
+               avl_delete(&patterns, &evs->pattern.avl);
+               break;
+       case EVS_CATCHALL:
+               list_del(&evs->catchall.list);
+               break;
+       }
+       free(evs);
 }
 
 void ubusd_event_cleanup_object(struct ubus_object *obj)
 {
-       struct event_pattern *ev;
+       struct event_source *ev;
 
-       while (!list_empty(&obj->event_patterns)) {
-               ev = list_first_entry(&obj->event_patterns,
-                                     struct event_pattern, list);
-               ubusd_delete_event_pattern(ev);
+       while (!list_empty(&obj->events)) {
+               ev = list_first_entry(&obj->events, struct event_source, list);
+               ubusd_delete_event_source(ev);
        }
 }
 
-static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
+enum {
+       EVMSG_PATTERN,
+       EVMSG_OBJECT,
+       EVMSG_LAST,
+};
+
+static struct blobmsg_policy ev_policy[] = {
+       [EVMSG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
+       [EVMSG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
+};
+
+
+static struct event_source *ubusd_alloc_event_source(struct ubus_object *obj, enum evs_type type, int datalen)
+{
+       struct event_source *evs;
+
+       evs = calloc(1, sizeof(*evs) + datalen);
+       list_add(&evs->list, &obj->events);
+       evs->obj = obj;
+       evs->type = type;
+       return evs;
+}
+
+static int ubusd_alloc_catchall(struct ubus_object *obj)
+{
+       struct event_source *evs;
+
+       evs = ubusd_alloc_event_source(obj, EVS_CATCHALL, 0);
+       list_add(&evs->catchall.list, &catch_all);
+
+       return 0;
+}
+
+static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
 {
-       fprintf(stderr, "event: call to method '%s'\n", method);
+       struct event_source *ev;
+       struct ubus_object *obj;
+       struct blob_attr *attr[EVMSG_LAST];
+       const char *pattern;
+       uint32_t id;
+
+       blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
+       if (!attr[EVMSG_OBJECT])
+               return UBUS_STATUS_INVALID_ARGUMENT;
+
+       id = blobmsg_get_u32(attr[EVMSG_OBJECT]);
+       if (id < UBUS_SYSTEM_OBJECT_MAX)
+               return UBUS_STATUS_PERMISSION_DENIED;
+
+       obj = ubusd_find_object(id);
+       if (!obj)
+               return UBUS_STATUS_NOT_FOUND;
+
+       if (obj->client != cl)
+               return UBUS_STATUS_PERMISSION_DENIED;
+
+       if (!attr[EVMSG_PATTERN])
+               return ubusd_alloc_catchall(obj);
+
+       pattern = blobmsg_data(attr[EVMSG_PATTERN]);
+       ev = ubusd_alloc_event_source(obj, EVS_PATTERN, strlen(pattern) + 1);
+       ev->pattern.avl.key = (void *) (ev + 1);
+       strcpy(ev->pattern.avl.key, pattern);
+       avl_insert(&patterns, &ev->pattern.avl);
+
        return 0;
 }
 
+static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
+{
+       if (!strcmp(method, "register"))
+               return ubusd_alloc_event_pattern(cl, msg);
+
+       return UBUS_STATUS_INVALID_COMMAND;
+}
+
 void ubusd_event_init(void)
 {
        ubus_init_string_tree(&patterns, true);