Events: refactoring

This new version allows to subscribe a client for
an event.

The event should first be created for the API
(the API's prefix is added) using 'afb_daemon_make_event'.

After that, plugins can subscribe or unsubscribe their
clients (identified through requests) to the events that
it generates. See 'afb_req_subscribe' and 'afb_req_unsubscribe'.

Events created by 'afb_daemon_make_event' can be widely
broadcasted using 'afb_event_broadcast' or pushed only to
suscribers using 'afb_event_push'.

Events can be destroyed using 'afb_event_drop'.

Change-Id: I7c0bed5e625c2052dcd81c6bfe960def1fa032f3
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/afb/afb-req-itf.h b/include/afb/afb-req-itf.h
index f4fab551..2b3bc467 100644
--- a/include/afb/afb-req-itf.h
+++ b/include/afb/afb-req-itf.h
@@ -25,6 +25,8 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#include <afb/afb-event-itf.h>
+
 /* avoid inclusion of <json-c/json.h> */
 struct json_object;
 
@@ -65,6 +67,9 @@ struct afb_req_itf {
 
 	void (*session_close)(void *closure);
 	int (*session_set_LOA)(void *closure, unsigned level);
+
+	int (*subscribe)(void *closure, struct afb_event event);
+	int (*unsubscribe)(void *closure, struct afb_event event);
 };
 
 /*
@@ -315,6 +320,29 @@ static inline struct afb_req afb_req_unstore(struct afb_req *req)
 	return result;
 }
 
+/*
+ * Establishes for the client link identified by 'req' a subscription
+ * to the 'event'.
+ * Returns 0 in case of successful subscription or -1 in case of error.
+ */
+static inline int afb_req_subscribe(struct afb_req req, struct afb_event event)
+{
+	return req.itf->subscribe(req.closure, event);
+}
+
+/*
+ * Revokes the subscription established to the 'event' for the client
+ * link identified by 'req'.
+ * Returns 0 in case of successful subscription or -1 in case of error.
+ */
+static inline int afb_req_unsubscribe(struct afb_req req, struct afb_event event)
+{
+	return req.itf->unsubscribe(req.closure, event);
+}
+
+
+
+
 /* internal use */
 static inline const char *afb_req_raw(struct afb_req req, size_t *size)
 {