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Add Broker::forward() function

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This enables explicit forwarding of events matching a given topic
prefix.  Even if a receiving node has an event handler, it will not
be raised if the event was sent along a topic that matches a previous
call to Broker::forward().
This commit is contained in:
Jon Siwek 2018-08-28 19:42:22 -05:00
parent 850030822d
commit 1dcead93bf
10 changed files with 214 additions and 15 deletions
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105
testing/btest/scripts/base/frameworks/cluster/forwarding.bro Normal file
View file

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# @TEST-SERIALIZE: comm
#
# @TEST-EXEC: btest-bg-run manager-1 BROPATH=$BROPATH:.. CLUSTER_NODE=manager-1 bro %INPUT
# @TEST-EXEC: btest-bg-run proxy-1 BROPATH=$BROPATH:.. CLUSTER_NODE=proxy-1 bro %INPUT
# @TEST-EXEC: btest-bg-run proxy-2 BROPATH=$BROPATH:.. CLUSTER_NODE=proxy-2 bro %INPUT
# @TEST-EXEC: btest-bg-run worker-1 BROPATH=$BROPATH:.. CLUSTER_NODE=worker-1 bro %INPUT
# @TEST-EXEC: btest-bg-run worker-2 BROPATH=$BROPATH:.. CLUSTER_NODE=worker-2 bro %INPUT
# @TEST-EXEC: btest-bg-wait 30
# @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-sort btest-diff manager-1/.stdout
# @TEST-EXEC: btest-diff proxy-1/.stdout
# @TEST-EXEC: btest-diff proxy-2/.stdout
# @TEST-EXEC: btest-diff worker-1/.stdout
# @TEST-EXEC: btest-diff worker-2/.stdout
@TEST-START-FILE cluster-layout.bro
redef Cluster::nodes = {
["manager-1"] = [$node_type=Cluster::MANAGER, $ip=127.0.0.1, $p=37757/tcp],
["proxy-1"] = [$node_type=Cluster::PROXY, $ip=127.0.0.1, $p=37758/tcp, $manager="manager-1"],
["proxy-2"] = [$node_type=Cluster::PROXY, $ip=127.0.0.1, $p=37759/tcp, $manager="manager-1"],
["worker-1"] = [$node_type=Cluster::WORKER, $ip=127.0.0.1, $p=37760/tcp, $manager="manager-1", $interface="eth0"],
["worker-2"] = [$node_type=Cluster::WORKER, $ip=127.0.0.1, $p=37761/tcp, $manager="manager-1", $interface="eth1"],
};
@TEST-END-FILE
global fully_connected: event();
global peer_count = 0;
global peers_lost = 0;
global fully_connected_nodes = 0;
event forwarded_event()
{
print "got forwarded event";
if ( Cluster::node == "manager-1" )
print "manager should NOT have raised the forwarded event";
terminate();
}
event ready()
{
# note that the publishing node, worker-1, will not receive the forwarded
# event as Broker's forwarding prevents the message going back to the
# immediate sender.
Broker::publish("test_topic", forwarded_event);
}
event fully_connected()
{
if ( ! is_remote_event() )
return;
print "Got fully_connected event";
fully_connected_nodes = fully_connected_nodes + 1;
if ( Cluster::node == "manager-1" )
{
if ( peer_count == 4 && fully_connected_nodes == 4 )
Broker::publish(Cluster::node_topic("worker-1"), ready);
}
}
event bro_init()
{
Broker::auto_publish(Cluster::manager_topic, fully_connected);
if ( Cluster::node == "manager-1" )
Broker::forward("test_topic");
if ( Cluster::node == "worker-1" )
Broker::subscribe("test_topic");
if ( Cluster::node == "worker-2" )
Broker::subscribe("test_topic");
}
event Broker::peer_added(endpoint: Broker::EndpointInfo, msg: string)
{
print "Connected to a peer";
peer_count = peer_count + 1;
if ( Cluster::node == "manager-1" )
{
if ( peer_count == 4 && fully_connected_nodes == 4 )
Broker::publish(Cluster::node_topic("worker-1"), ready);
}
else
{
if ( peer_count == 3 )
event fully_connected();
}
}
event Broker::peer_lost(endpoint: Broker::EndpointInfo, msg: string)
{
++peers_lost;
if ( Cluster::node == "manager-1" )
{
if ( peers_lost == 2 )
# Both workers terminated
terminate();
}
else
terminate();
}