wangyu-UDPspeeder/connection.cpp

/*
 * connection.cpp
 *
 *  Created on: Sep 23, 2017
 *      Author: root
 */

#include "connection.h"

//const int disable_conv_clear=0;//a udp connection in the multiplexer is called conversation in this program,conv for short.

const int disable_conn_clear=0;//a raw connection is called conn.

int report_interval=0;

void server_clear_function(u64_t u64)//used in conv_manager in server mode.for server we have to use one udp fd for one conv(udp connection),
//so we have to close the fd when conv expires
{
	fd64_t fd64=u64;
	assert(fd_manager.exist(fd64));
	ev_io &watcher= fd_manager.get_info(fd64).io_watcher;

	address_t &addr=fd_manager.get_info(fd64).addr;//
	assert(conn_manager.exist(addr));//
	struct ev_loop *loop =conn_manager.find_insert(addr).loop;  // overkill ? should we just use ev_default_loop(0)?

	ev_io_stop(loop,&watcher);

	fd_manager.fd64_close(fd64);

}


////////////////////////////////////////////////////////////////////

conn_manager_t::conn_manager_t()
{
	 mp.reserve(10007);
	 last_clear_time=0;
}
int conn_manager_t::exist(address_t addr)
{

	 if(mp.find(addr)!=mp.end())
	 {
		 return 1;
	 }
	 return 0;
}

conn_info_t *& conn_manager_t::find_insert_p(address_t addr)  //be aware,the adress may change after rehash
{
// u64_t u64=0;
 //u64=ip;
 //u64<<=32u;
 //u64|=port;
 unordered_map<address_t,conn_info_t*>::iterator it=mp.find(addr);
	 if(it==mp.end())
	 {
		 mp[addr]=new conn_info_t;
		 //lru.new_key(addr);
	 }
	 else
	 {
		 //lru.update(addr);
	 }
	 return mp[addr];
}
conn_info_t & conn_manager_t::find_insert(address_t addr)  //be aware,the adress may change after rehash
{
 //u64_t u64=0;
 //u64=ip;
 //u64<<=32u;
 //u64|=port;
 unordered_map<address_t,conn_info_t*>::iterator it=mp.find(addr);
	 if(it==mp.end())
	 {
		 mp[addr]=new conn_info_t;
		 //lru.new_key(addr);
	 }
	 else
	 {
		 //lru.update(addr);
	 }
	 return *mp[addr];
}
int conn_manager_t::erase(unordered_map<address_t,conn_info_t*>::iterator erase_it)
{
	delete(erase_it->second);
	mp.erase(erase_it->first);
	return 0;
}
int conn_manager_t::clear_inactive()
{
	if(get_current_time()-last_clear_time>conn_clear_interval)
	{
		last_clear_time=get_current_time();
		return clear_inactive0();
	}
	return 0;
}

int conn_manager_t::clear_inactive0()
{
//mylog(log_info,"called\n");
	 unordered_map<address_t,conn_info_t*>::iterator it;
	 unordered_map<address_t,conn_info_t*>::iterator old_it;

	if(disable_conn_clear) return 0;

	//map<uint32_t,uint64_t>::iterator it;
	int cnt=0;
	it=clear_it;//TODO,write it back
	int size=mp.size();
	int num_to_clean=size/conn_clear_ratio+conn_clear_min;   //clear 1/10 each time,to avoid latency glitch

	//mylog(log_trace,"mp.size() %d\n", size);

	num_to_clean=min(num_to_clean,(int)mp.size());
	u64_t current_time=get_current_time();

	//mylog(log_info,"here size=%d\n",(int)mp.size());
	for(;;)
	{
		if(cnt>=num_to_clean) break;
		if(mp.begin()==mp.end()) break;
		if(it==mp.end())
		{
			it=mp.begin();
		}

		if(it->second->conv_manager.s.get_size() >0)
		{
			//mylog(log_info,"[%s:%d]size %d \n",my_ntoa(get_u64_h(it->first)),get_u64_l(it->first),(int)it->second->conv_manager.get_size());
			it++;
		}
		else if(current_time<it->second->last_active_time+server_conn_timeout)
		{
			it++;
		}
		else
		{
			address_t tmp_addr=it->first;// avoid making get_str() const;
			mylog(log_info,"{%s} inactive conn cleared \n",tmp_addr.get_str());
			old_it=it;
			it++;
			erase(old_it);
		}
		cnt++;
	}
	clear_it=it;
	return 0;
}