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git://xwords.git.sourceforge.net/gitroot/xwords/xwords
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107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
/* -*- compile-command: "make -k -j3"; -*- */
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/*
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* Copyright 2013 by Eric House (xwords@eehouse.org). All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <glib.h>
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#include "udpager.h"
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#include "configs.h"
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#include "mlock.h"
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static UDPAger* s_instance = NULL;
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/* static */ UDPAger*
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UDPAger::Get()
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{
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if ( NULL == s_instance ) {
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s_instance = new UDPAger();
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}
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return s_instance;
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} /* Get */
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UDPAger::UDPAger()
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{
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if ( !RelayConfigs::GetConfigs()-> GetValueFor( "UDP_RECYLE_INTERVAL",
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&m_maxIntervalSecs ) ) {
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assert(0);
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}
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logf( XW_LOGINFO, "read %d from configs for UDP_RECYLE_INTERVAL",
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m_maxIntervalSecs );
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m_maxIntervalMillis = m_maxIntervalSecs * 1000;
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pthread_mutex_init( &m_addrTimeMapLock, NULL );
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}
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// An address is valid as long as we keep hearing from it within a certain
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// frequency. When we hear from it but it's been too long, assume it's new
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// and give it a new timestamp.
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void
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UDPAger::Refresh( const AddrInfo* addr )
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{
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const AddrInfo::AddrUnion* saddr = addr->saddr();
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uint32_t readWhen = addr->created();
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gchar* b64 = g_base64_encode( (uint8_t*)&saddr->u.addr,
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sizeof(saddr->u.addr) );
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MutexLock ml( &m_addrTimeMapLock );
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map<AddrInfo::AddrUnion, AgePair*>::iterator iter =
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m_addrTimeMap.find( *saddr );
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if ( m_addrTimeMap.end() == iter ) { // it's new; just insert
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AgePair* ap = new AgePair( readWhen, readWhen );
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m_addrTimeMap.insert( pair<AddrInfo::AddrUnion,
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AgePair*>(*saddr, ap ) );
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logf( XW_LOGINFO, "%s: adding '%s'", __func__, b64 );
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} else {
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AgePair* ap = iter->second;
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assert( ap->lastSeen() <= readWhen );
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int interval = readWhen - ap->lastSeen();
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if ( m_maxIntervalMillis >= interval ) {
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logf( XW_LOGINFO, "%s: refreshing '%s'; last seen %d "
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"milliseconds ago", __func__, b64, interval );
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ap->update( readWhen );
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} else {
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logf( XW_LOGINFO, "%s: RESETTING '%s'; last seen %d "
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"milliseconds ago", __func__, b64, interval );
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delete ap;
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iter->second = new AgePair( readWhen, readWhen );
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}
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}
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g_free( b64 );
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}
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bool
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UDPAger::IsCurrent( const AddrInfo* addr )
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{
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const AddrInfo::AddrUnion* saddr = addr->saddr();
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uint32_t readWhen = addr->created();
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MutexLock ml( &m_addrTimeMapLock );
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map<AddrInfo::AddrUnion, AgePair*>::const_iterator iter =
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m_addrTimeMap.find( *saddr );
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assert( m_addrTimeMap.end() != iter );
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AgePair* ap = iter->second;
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bool result = readWhen >= ap->created();
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if ( !result ) {
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logf( XW_LOGINFO, "%s() => %d", __func__, result );
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}
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return result;
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}
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