server: Add event system

1 files changed, 99 insertions, 0 deletions

diff --git a/event.c b/event.c
new file mode 100644
index 0000000..40eaff8
--- /dev/null
+++ b/event.c
@@ -0,0 +1,99 @@
+#include <string.h>
+#include "event.h"
+
+
+struct cbs_chain{
+	event_callback_t *cb;
+	struct cbs_chain *prev,*next;
+};
+
+struct cbs_chain *callbacks=NULL,*callbacks_last=NULL;
+
+
+static struct cbs_chain* find_chain_item(event_callback_t *cb){
+	struct cbs_chain *item=callbacks;
+	while(item&&item->cb!=cb)item=item->next;
+	return item;
+}
+
+
+void event_register(event_callback_t *cb){
+	struct cbs_chain *item=find_chain_item(cb);
+	if(item!=NULL){
+		debug("event_register: callback %p already registered!",cb);
+		return;
+	}
+	item=malloc(1,struct cbs_chain);
+	item->cb=cb;
+	item->prev=item->next=NULL;
+	if(callbacks){
+		item->prev=callbacks_last;
+		callbacks_last->next=item;
+		callbacks_last=item;
+	} else {
+		callbacks=callbacks_last=item;
+	}
+}
+
+void event_unregister(event_callback_t *cb){
+	struct cbs_chain *item=find_chain_item(cb);
+	if(item==NULL){
+		debug("event_unregister: callback %p was not registered!",cb);
+		return;
+	}
+	if(item->prev)item->prev->next=item->next;
+	if(item->next)item->next->prev=item->prev;
+	if(callbacks==item)callbacks=item->next;
+	if(callbacks_last==item)callbacks_last=item->prev;
+	free(item);
+}
+
+struct event_item* event_item_alloc(void){
+	struct event_item *event=malloc(1,struct event_item);
+	memset(event,0,sizeof(struct event_item));
+	return event;
+}
+
+void event_item_free(struct event_item *event){
+	if(event->message)free(event->message);
+	if(event->user)free(event->user);
+	if(event->room)free(event->room);
+	free(event);
+}
+
+void event_emit(const struct event_item *event){
+	for(struct cbs_chain *item=callbacks;item!=NULL;item=item->next){
+		item->cb(event);
+	}
+}
+
+void event_emit_message(i64 timestamp,const char *message,const char *user,const char *room){
+	struct event_item *event=event_item_alloc();
+	event->type=EVENT_MESSAGE;
+	event->timestamp=timestamp;
+	event->message=strdup(message);
+	event->user=strdup(user);
+	event->room=strdup(room);
+	event_emit(event);
+	event_item_free(event);
+}
+
+void event_emit_online(i64 timestamp,const char *user,i64 numonline){
+	struct event_item *event=event_item_alloc();
+	event->type=EVENT_ONLINE;
+	event->timestamp=timestamp;
+	event->user=strdup(user);
+	event->num=numonline;
+	event_emit(event);
+	event_item_free(event);
+}
+
+void event_emit_join(i64 timestamp,const char *user,const char *room){
+	struct event_item *event=event_item_alloc();
+	event->type=EVENT_JOIN;
+	event->timestamp=timestamp;
+	event->user=strdup(user);
+	event->room=strdup(room);
+	event_emit(event);
+	event_item_free(event);
+}