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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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19
src/broker/Manager.h
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@ -224,10 +224,21 @@ public:
*/
bool Subscribe(const std::string& topic_prefix);
/**
* Register interest in peer event messages that use a certain topic prefix,
* but that should not be raised locally, just forwarded to any subscribing
* peers.
* @param topic_prefix a prefix to match against remote message topics.
* e.g. an empty prefix will match everything and "a" will match "alice"
* and "amy" but not "bob".
* @return true if it's a new event forward/subscription and it is now registered.
*/
bool Forward(std::string topic_prefix);
/**
* Unregister interest in peer event messages.
* @param topic_prefix a prefix previously supplied to a successful call
* to bro_broker::Manager::Subscribe().
* to bro_broker::Manager::Subscribe() or bro_broker::Manager::Forward().
* @return true if interest in topic prefix is no longer advertised.
*/
bool Unsubscribe(const std::string& topic_prefix);
@ -311,9 +322,8 @@ public:
private:
void DispatchMessage(broker::data msg);
void ProcessEvent(std::string name, broker::vector args);
void ProcessEvent(broker::bro::Event ev);
void DispatchMessage(const broker::topic& topic, broker::data msg);
void ProcessEvent(const broker::topic& topic, broker::bro::Event ev);
bool ProcessLogCreate(broker::bro::LogCreate lc);
bool ProcessLogWrite(broker::bro::LogWrite lw);
bool ProcessIdentifierUpdate(broker::bro::IdentifierUpdate iu);
@ -364,6 +374,7 @@ private:
std::unordered_map<std::string, StoreHandleVal*> data_stores;
std::unordered_map<query_id, StoreQueryCallback*,
query_id_hasher> pending_queries;
std::vector<std::string> forwarded_prefixes;
Stats statistics;