BrokerStore<->Zeek tables: &backend works for in-memory stores.

Currently this requires using this with a normal cluster - or sending
messages by yourself.

It, in principle, should also work with SQLITE - but that is a bit
nonsensical without being able to change the storage location.

scripts/base/frameworks/cluster/__load__.zeek

@@ -49,5 +49,7 @@ redef Broker::log_topic = Cluster::rr_log_topic;
 @load ./nodes/worker
 @endif
 
+@load ./broker-stores.zeek
+
 @endif
 @endif

scripts/base/frameworks/cluster/broker-stores.zeek

@@ -0,0 +1,46 @@
+
+module Broker;
+
+export {
+	global announce_masters: event(masters: set[string]);
+}
+
+@if ( Cluster::is_enabled() && Cluster::local_node_type() != Cluster::MANAGER )
+redef Broker::auto_store_master = F;
+@endif
+
+@if ( Broker::auto_store_master )
+
+global broker_backed_ids: set[string];
+
+event zeek_init()
+	{
+	local globals = global_ids();
+	for ( id in globals )
+		{
+		if ( globals[id]$broker_backend )
+			add broker_backed_ids[id];
+		}
+	}
+
+event Broker::peer_added(endpoint: Broker::EndpointInfo, msg: string) &priority=1
+	{
+	if ( ! Cluster::is_enabled() )
+		return;
+
+	local e = Broker::make_event(Broker::announce_masters, broker_backed_ids);
+	Broker::publish(Cluster::nodeid_topic(endpoint$id), e);
+	}
+
+@else
+
+event Broker::announce_masters(masters: set[string])
+	{
+	for ( i in masters )
+		{
+		local name = "___sync_store_" + i;
+		Broker::create_clone(name);
+		}
+	}
+
+@endif

scripts/base/frameworks/cluster/main.zeek

@@ -249,10 +249,6 @@ export {
 	global nodeid_topic: function(id: string): string;
 }
 
-@if ( Cluster::is_enabled() && Cluster::local_node_type() != Cluster::MANAGER ) )
-redef Broker::store_master = T;
-@endif
-
 global active_worker_ids: set[string] = set();
 
 type NamedNode: record {