X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fubus.git;a=blobdiff_plain;f=ubusd_event.c;h=6d0ae3014d7e5ef69254d94ff6579e8a98fca308;hp=da0aed80273ec89e505c102de5c098a418cd18da;hb=ba607d976b77c40162637d354fd8e1560384a66d;hpb=fa989780bda3ad10fcbb637390d59afe2b32ba81

diff --git a/ubusd_event.c b/ubusd_event.c
index da0aed8..6d0ae30 100644
--- a/ubusd_event.c
+++ b/ubusd_event.c
@@ -1,45 +1,273 @@
+/*
+ * Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arpa/inet.h>
 #include "ubusd.h"
 
 static struct avl_tree patterns;
 static struct ubus_object *event_obj;
+static int event_seq = 0;
+static int obj_event_seq = 1;
 
-struct event_pattern {
+struct event_source {
+	struct list_head list;
+	struct ubus_object *obj;
 	struct avl_node avl;
+	bool partial;
+};
 
-	struct ubus_object *obj;
-	struct list_head list;
+static void ubusd_delete_event_source(struct event_source *evs)
+{
+	list_del(&evs->list);
+	avl_delete(&patterns, &evs->avl);
+	free(evs);
+}
+
+void ubusd_event_cleanup_object(struct ubus_object *obj)
+{
+	struct event_source *ev;
+
+	while (!list_empty(&obj->events)) {
+		ev = list_first_entry(&obj->events, struct event_source, list);
+		ubusd_delete_event_source(ev);
+	}
+}
+
+enum {
+	EVREG_PATTERN,
+	EVREG_OBJECT,
+	EVREG_LAST,
+};
 
-	const char *path;
+static struct blobmsg_policy evr_policy[] = {
+	[EVREG_PATTERN] = { .name = "pattern", .type = BLOBMSG_TYPE_STRING },
+	[EVREG_OBJECT] = { .name = "object", .type = BLOBMSG_TYPE_INT32 },
 };
 
-static void ubusd_delete_event_pattern(struct event_pattern *ev)
+static int ubusd_alloc_event_pattern(struct ubus_client *cl, struct blob_attr *msg)
 {
-	list_del(&ev->list);
-	avl_delete(&patterns, &ev->avl);
-	free(ev);
+	struct event_source *ev;
+	struct ubus_object *obj;
+	struct blob_attr *attr[EVREG_LAST];
+	char *pattern, *name;
+	uint32_t id;
+	bool partial = false;
+	int len;
+
+	blobmsg_parse(evr_policy, EVREG_LAST, attr, blob_data(msg), blob_len(msg));
+	if (!attr[EVREG_OBJECT] || !attr[EVREG_PATTERN])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	id = blobmsg_get_u32(attr[EVREG_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;
+
+	pattern = blobmsg_data(attr[EVREG_PATTERN]);
+
+	len = strlen(pattern);
+	if (pattern[len - 1] == '*') {
+		partial = true;
+		pattern[len - 1] = 0;
+		len--;
+	}
+
+	ev = calloc(1, sizeof(*ev) + len + 1);
+	if (!ev)
+		return UBUS_STATUS_NO_DATA;
+
+	list_add(&ev->list, &obj->events);
+	ev->obj = obj;
+	ev->partial = partial;
+	name = (char *) (ev + 1);
+	strcpy(name, pattern);
+	ev->avl.key = name;
+	avl_insert(&patterns, &ev->avl);
+
+	return 0;
 }
 
-void ubusd_event_cleanup_object(struct ubus_object *obj)
+typedef struct ubus_msg_buf *(*event_fill_cb)(void *priv, const char *id);
+
+static void ubusd_send_event_msg(struct ubus_msg_buf **ub, struct ubus_client *cl,
+				 struct ubus_object *obj, const char *id,
+				 event_fill_cb fill_cb, void *cb_priv)
 {
-	struct event_pattern *ev;
+	uint32_t *objid_ptr;
 
-	while (!list_empty(&obj->event_patterns)) {
-		ev = list_first_entry(&obj->event_patterns,
-				      struct event_pattern, list);
-		ubusd_delete_event_pattern(ev);
+	/* do not loop back events */
+	if (obj->client == cl)
+	    return;
+
+	/* do not send duplicate events */
+	if (obj->event_seen == obj_event_seq)
+		return;
+
+	obj->event_seen = obj_event_seq;
+
+	if (!*ub) {
+		*ub = fill_cb(cb_priv, id);
+		(*ub)->hdr.type = UBUS_MSG_INVOKE;
+		(*ub)->hdr.peer = 0;
 	}
+
+	objid_ptr = blob_data(blob_data((*ub)->data));
+	*objid_ptr = htonl(obj->id.id);
+
+	(*ub)->hdr.seq = ++event_seq;
+	ubus_msg_send(obj->client, *ub, false);
 }
 
-static int ubusd_event_recv(struct ubus_client *cl, const char *method, struct blob_attr *msg)
+static bool strmatch_len(const char *s1, const char *s2, int *len)
 {
-	fprintf(stderr, "event: call to method '%s'\n", method);
+	for (*len = 0; s1[*len] == s2[*len]; (*len)++)
+		if (!s1[*len])
+			return true;
+
+	return false;
+}
+
+static int ubusd_send_event(struct ubus_client *cl, const char *id,
+			    event_fill_cb fill_cb, void *cb_priv)
+{
+	struct ubus_msg_buf *ub = NULL;
+	struct event_source *ev;
+	int match_len = 0;
+
+	obj_event_seq++;
+
+	/*
+	 * Since this tree is sorted alphabetically, we can only expect to find
+	 * matching entries as long as the number of matching characters
+	 * between the pattern string and our string is monotonically increasing.
+	 */
+	avl_for_each_element(&patterns, ev, avl) {
+		const char *key = ev->avl.key;
+		int cur_match_len;
+		bool full_match;
+
+		full_match = strmatch_len(id, key, &cur_match_len);
+		if (cur_match_len < match_len)
+			break;
+
+		match_len = cur_match_len;
+
+		if (!full_match) {
+			if (!ev->partial)
+				continue;
+
+			if (match_len != strlen(key))
+				continue;
+		}
+
+		ubusd_send_event_msg(&ub, cl, ev->obj, id, fill_cb, cb_priv);
+	}
+
+	if (ub)
+		ubus_msg_free(ub);
+
 	return 0;
 }
 
+enum {
+	EVMSG_ID,
+	EVMSG_DATA,
+	EVMSG_LAST,
+};
+
+static struct blobmsg_policy ev_policy[] = {
+	[EVMSG_ID] = { .name = "id", .type = BLOBMSG_TYPE_STRING },
+	[EVMSG_DATA] = { .name = "data", .type = BLOBMSG_TYPE_TABLE },
+};
+
+static struct ubus_msg_buf *
+ubusd_create_event_from_msg(void *priv, const char *id)
+{
+	struct blob_attr *msg = priv;
+
+	blob_buf_init(&b, 0);
+	blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+	blob_put_string(&b, UBUS_ATTR_METHOD, id);
+	blob_put(&b, UBUS_ATTR_DATA, blobmsg_data(msg), blobmsg_data_len(msg));
+
+	return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+static int ubusd_forward_event(struct ubus_client *cl, struct blob_attr *msg)
+{
+	struct blob_attr *data;
+	struct blob_attr *attr[EVMSG_LAST];
+	const char *id;
+
+	blobmsg_parse(ev_policy, EVMSG_LAST, attr, blob_data(msg), blob_len(msg));
+	if (!attr[EVMSG_ID] || !attr[EVMSG_DATA])
+		return UBUS_STATUS_INVALID_ARGUMENT;
+
+	id = blobmsg_data(attr[EVMSG_ID]);
+	data = attr[EVMSG_DATA];
+
+	if (!strncmp(id, "ubus.", 5))
+		return UBUS_STATUS_PERMISSION_DENIED;
+
+	return ubusd_send_event(cl, id, ubusd_create_event_from_msg, data);
+}
+
+static int ubusd_event_recv(struct ubus_client *cl, struct ubus_msg_buf *ub, const char *method, struct blob_attr *msg)
+{
+	if (!strcmp(method, "register"))
+		return ubusd_alloc_event_pattern(cl, msg);
+
+	if (!strcmp(method, "send"))
+		return ubusd_forward_event(cl, msg);
+
+	return UBUS_STATUS_INVALID_COMMAND;
+}
+
+static struct ubus_msg_buf *
+ubusd_create_object_event_msg(void *priv, const char *id)
+{
+	struct ubus_object *obj = priv;
+	void *s;
+
+	blob_buf_init(&b, 0);
+	blob_put_int32(&b, UBUS_ATTR_OBJID, 0);
+	blob_put_string(&b, UBUS_ATTR_METHOD, id);
+	s = blob_nest_start(&b, UBUS_ATTR_DATA);
+	blobmsg_add_u32(&b, "id", obj->id.id);
+	blobmsg_add_string(&b, "path", obj->path.key);
+	blob_nest_end(&b, s);
+
+	return ubus_msg_new(b.head, blob_raw_len(b.head), true);
+}
+
+void ubusd_send_obj_event(struct ubus_object *obj, bool add)
+{
+	const char *id = add ? "ubus.object.add" : "ubus.object.remove";
+
+	ubusd_send_event(NULL, id, ubusd_create_object_event_msg, obj);
+}
+
 void ubusd_event_init(void)
 {
 	ubus_init_string_tree(&patterns, true);
 	event_obj = ubusd_create_object_internal(NULL, UBUS_SYSTEM_OBJECT_EVENT);
-	event_obj->recv_msg = ubusd_event_recv;
+	if (event_obj != NULL)
+		event_obj->recv_msg = ubusd_event_recv;
 }