Add transition_priority method to election class

nano/node/election.cpp

@@ -183,6 +183,25 @@ void nano::election::transition_active ()
 	state_change (nano::election_state::passive, nano::election_state::active);
 }
 
+bool nano::election::transition_priority ()
+{
+	nano::lock_guard<nano::mutex> guard{ mutex };
+
+	if (behavior_m == nano::election_behavior::priority || behavior_m == nano::election_behavior::manual)
+	{
+		return false;
+	}
+
+	behavior_m = nano::election_behavior::priority;
+	last_vote = std::chrono::steady_clock::time_point{}; // allow new outgoing votes immediately
+
+	node.logger.debug (nano::log::type::election, "Transitioned election behavior to priority from {} for root: {}",
+	to_string (behavior_m),
+	qualified_root.to_string ());
+
+	return true;
+}
+
 void nano::election::cancel ()
 {
 	nano::lock_guard<nano::mutex> guard{ mutex };

nano/node/election.hpp

@@ -87,6 +87,7 @@ class election final : public std::enable_shared_from_this<election>
 public: // State transitions
 	bool transition_time (nano::confirmation_solicitor &);
 	void transition_active ();
+	bool transition_priority ();
 	void cancel ();
 
 public: // Status