Tag broadcasted events with UUID and hop

When API have mutual dependencies, leading to
loops in dependecies, broadcasting an event
never ends because of the loop (see SPEC-2625).

To avoid that weird flood of events, a unic
identifier (UUID) is attached to broadcasted
event and a tiny memory records previously
broadcasted events to avoid re-sending an
already sent event.

The size of the memory can be set using the
macro variable EVENT_BROADCAST_MEMORY_COUNT
whose default value is 8. It can be reduced
to 0.

An other mecanism is added to limit the count
of hops that a broadcasted event can do. That
count can be set using the macro variable
EVENT_BROADCAST_HOP_MAX whose default value
is 10.

Bug-AGL: SPEC-2625

Change-Id: I29550a8a5c8f5e2ffb20edc3330357a1e870c0e2
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/afb-stub-ws.c b/src/afb-stub-ws.c
index 4c6fafac..6a52f6fc 100644
--- a/src/afb-stub-ws.c
+++ b/src/afb-stub-ws.c
@@ -341,12 +341,12 @@ static void server_event_push_cb(void *closure, const char *event, int eventid,
 	json_object_put(object);
 }
 
-static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object)
+static void server_event_broadcast_cb(void *closure, const char *event, struct json_object *object, const uuid_binary_t uuid, uint8_t hop)
 {
 	struct afb_stub_ws *stubws = closure;
 
 	if (stubws->proto != NULL)
-		afb_proto_ws_server_event_broadcast(stubws->proto, event, object);
+		afb_proto_ws_server_event_broadcast(stubws->proto, event, object, uuid, hop);
 	json_object_put(object);
 }
 
@@ -457,9 +457,9 @@ static void client_on_event_push_cb(void *closure, const char *event_name, int e
 		ERROR("unreadable push event");
 }
 
-static void client_on_event_broadcast_cb(void *closure, const char *event_name, struct json_object *data)
+static void client_on_event_broadcast_cb(void *closure, const char *event_name, struct json_object *data, const uuid_binary_t uuid, uint8_t hop)
 {
-	afb_evt_broadcast(event_name, data);
+	afb_evt_rebroadcast(event_name, data, uuid, hop);
 }
 
 /*****************************************************/