network_throttle: use circular_buffer where appropriate

contrib/epee/include/net/network_throttle-detail.hpp

@@ -36,6 +36,7 @@
 #ifndef INCLUDED_throttle_detail_hpp
 #define INCLUDED_throttle_detail_hpp
 
+#include <boost/circular_buffer.hpp>
 #include "network_throttle.hpp"
 
 namespace epee
@@ -61,7 +62,7 @@ class network_throttle : public i_network_throttle {
 		network_time_seconds m_slot_size; // the size of one slot. TODO: now hardcoded for 1 second e.g. in time_to_slot()
 		// TODO for big window size, for performance better the substract on change of m_last_sample_time instead of recalculating average of eg >100 elements
 
-		std::vector< packet_info > m_history; // the history of bw usage
+		boost::circular_buffer< packet_info > m_history; // the history of bw usage
 		network_time_seconds m_last_sample_time; // time of last history[0] - so we know when to rotate the buffer
 		network_time_seconds m_start_time; // when we were created
 		bool m_any_packet_yet; // did we yet got any packet to count

contrib/epee/src/network_throttle-detail.cpp

@@ -135,6 +135,7 @@ network_throttle::network_throttle(const std::string &nameshort, const std::stri
 	m_slot_size = 1.0; // hard coded in few places
 	m_target_speed = 16 * 1024; // other defaults are probably defined in the command-line parsing code when this class is used e.g. as main global throttle
 	m_last_sample_time = 0;
+	m_history.resize(m_window_size);
 }
 
 void network_throttle::set_name(const std::string &name) 
@@ -168,8 +169,7 @@ void network_throttle::tick()
 	{
 		_dbg3("Moving counter buffer by 1 second " << last_sample_time_slot << " < " << current_sample_time_slot << " (last time " << m_last_sample_time<<")");
 		// rotate buffer 
-		for (size_t i=m_history.size()-1; i>=1; --i) m_history[i] = m_history[i-1];
-		m_history[0] = packet_info();
+		m_history.push_front(packet_info());
 		if (! m_any_packet_yet) 
 		{
 			m_last_sample_time = time_now;	
@@ -191,7 +191,7 @@ void network_throttle::_handle_trafic_exact(size_t packet_size, size_t orginal_s
 
 	calculate_times_struct cts ;  calculate_times(packet_size, cts , false, -1);
 	calculate_times_struct cts2;  calculate_times(packet_size, cts2, false, 5);
-	m_history[0].m_size += packet_size;
+	m_history.front().m_size += packet_size;
 
 	std::ostringstream oss; oss << "["; 	for (auto sample: m_history) oss << sample.m_size << " ";	 oss << "]" << std::ends;
 	std::string history_str = oss.str();