1 files changed, 158 insertions, 0 deletions
diff --git a/avahi-core/subscribe.c b/avahi-core/subscribe.c
new file mode 100644
index 0000000..00d3385
--- /dev/null
+++ b/avahi-core/subscribe.c
@@ -0,0 +1,158 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+ 
+  avahi is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+ 
+  avahi 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 Lesser General
+  Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "subscribe.h"
+#include "util.h"
+
+static void elapse(AvahiTimeEvent *e, void *userdata) {
+    AvahiSubscription *s = userdata;
+    GTimeVal tv;
+    gchar *t;
+    
+    g_assert(s);
+
+    avahi_server_post_query(s->server, s->interface, s->protocol, s->key);
+
+    if (s->n_query++ <= 8)
+        s->sec_delay *= 2;
+
+    g_message("%i. Continuous querying for %s", s->n_query, t = avahi_key_to_string(s->key));
+    g_free(t);
+    
+    avahi_elapse_time(&tv, s->sec_delay*1000, 0);
+    avahi_time_event_queue_update(s->server->time_event_queue, s->time_event, &tv);
+}
+
+struct cbdata {
+    AvahiSubscription *subscription;
+    AvahiInterface *interface;
+};
+
+static gpointer scan_cache_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, gpointer userdata) {
+    struct cbdata *cbdata = userdata;
+
+    g_assert(c);
+    g_assert(pattern);
+    g_assert(e);
+    g_assert(cbdata);
+
+    cbdata->subscription->callback(
+        cbdata->subscription,
+        e->record,
+        cbdata->interface->hardware->index,
+        cbdata->interface->protocol,
+        AVAHI_SUBSCRIPTION_NEW,
+        cbdata->subscription->userdata);
+
+    return NULL;
+}
+
+static void scan_interface_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
+    AvahiSubscription *s = userdata;
+    struct cbdata cbdata = { s, i };
+
+    g_assert(m);
+    g_assert(i);
+    g_assert(s);
+
+    avahi_cache_walk(i->cache, s->key, scan_cache_callback, &cbdata);
+}
+
+AvahiSubscription *avahi_subscription_new(AvahiServer *server, AvahiKey *key, gint interface, guchar protocol, AvahiSubscriptionCallback callback, gpointer userdata) {
+    AvahiSubscription *s, *t;
+    GTimeVal tv;
+
+    g_assert(server);
+    g_assert(key);
+    g_assert(callback);
+
+    g_assert(!avahi_key_is_pattern(key));
+    
+    s = g_new(AvahiSubscription, 1);
+    s->server = server;
+    s->key = avahi_key_ref(key);
+    s->interface = interface;
+    s->protocol = protocol;
+    s->callback = callback;
+    s->userdata = userdata;
+    s->n_query = 1;
+    s->sec_delay = 1;
+
+    avahi_server_post_query(s->server, s->interface, s->protocol, s->key);
+    
+    avahi_elapse_time(&tv, s->sec_delay*1000, 0);
+    s->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, elapse, s);
+
+    AVAHI_LLIST_PREPEND(AvahiSubscription, subscriptions, server->subscriptions, s);
+
+    /* Add the new entry to the subscription hash table */
+    t = g_hash_table_lookup(server->subscription_hashtable, key);
+    AVAHI_LLIST_PREPEND(AvahiSubscription, by_key, t, s);
+    g_hash_table_replace(server->subscription_hashtable, key, t);
+
+    /* Scan the caches */
+    avahi_interface_monitor_walk(s->server->monitor, s->interface, s->protocol, scan_interface_callback, s);
+    
+    return s;
+}
+
+void avahi_subscription_free(AvahiSubscription *s) {
+    AvahiSubscription *t;
+    
+    g_assert(s);
+
+    AVAHI_LLIST_REMOVE(AvahiSubscription, subscriptions, s->server->subscriptions, s);
+
+    t = g_hash_table_lookup(s->server->subscription_hashtable, s->key);
+    AVAHI_LLIST_REMOVE(AvahiSubscription, by_key, t, s);
+    if (t)
+        g_hash_table_replace(s->server->subscription_hashtable, t->key, t);
+    else
+        g_hash_table_remove(s->server->subscription_hashtable, s->key);
+    
+    avahi_time_event_queue_remove(s->server->time_event_queue, s->time_event);
+    avahi_key_unref(s->key);
+
+    
+    g_free(s);
+}
+
+void avahi_subscription_notify(AvahiServer *server, AvahiInterface *i, AvahiRecord *record, AvahiSubscriptionEvent event) {
+    AvahiSubscription *s;
+    
+    g_assert(server);
+    g_assert(record);
+
+    for (s = g_hash_table_lookup(server->subscription_hashtable, record->key); s; s = s->by_key_next)
+        if (avahi_interface_match(i, s->interface, s->protocol))
+            s->callback(s, record, i->hardware->index, i->protocol, event, s->userdata);
+}
+
+gboolean avahi_is_subscribed(AvahiServer *server, AvahiKey *k) {
+    g_assert(server);
+    g_assert(k);
+
+    return !!g_hash_table_lookup(server->subscription_hashtable, k);
+}