void forward_moudle::process_packet(google::protobuf::Message* msg, connection_ptr connection, connection_manager&)
{
proto::avpacket* pkt = dynamic_cast<proto::avpacket*>(msg);
if (pkt->dest().domain() != m_thisdomain)
{
// TODO 暂时不实现非本域的转发.
}
// 根据发送人更新 routing_table
if (m_routing_table.find(pkt->src().username()) == std::end(m_routing_table))
{
connection->store_module_private("username", pkt->src().username());
m_routing_table.insert(std::make_pair(pkt->src().username(), connection));
}
// 根据用户名找到连接.
auto forward_target = m_routing_table.find(pkt->dest().username());
connection_ptr conn = forward_target->second.lock();
if (forward_target != m_routing_table.end() && conn)
{
// 找到, 转发过去.
// TTL 减1.
if (pkt->time_to_live() > 1)
{
pkt->set_time_to_live(pkt->time_to_live() - 1);
conn->write_msg(encode(*pkt));
}
else
{
// TODO 发送 ttl = 0 消息.
}
}
else
{
// 没找到，回一个 aGMP 消息报告 no route to host.
}
// TODO 根据目的地址转发消息.
}
