1.RTT计算
![46muduo库使用示例(五)_第1张图片](http://img.e-com-net.com/image/info8/3323b7aa42924c45bc4a5fc9dc1728b6.jpg)
2.代码
#include
#include
#include
#include
#include
using namespace muduo;
using namespace muduo::net;
const size_t frameLen = 2*sizeof(int64_t);
void serverConnectionCallback(const TcpConnectionPtr& conn)
{
LOG_TRACE << conn->name() << " " << conn->peerAddress().toIpPort() << " -> "
<< conn->localAddress().toIpPort() << " is "
<< (conn->connected() ? "UP" : "DOWN");
if (conn->connected())
{
conn->setTcpNoDelay(true);
}
else
{
}
}
void serverMessageCallback(const TcpConnectionPtr& conn,
Buffer* buffer,
muduo::Timestamp receiveTime)
{
int64_t message[2];
while (buffer->readableBytes() >= frameLen)
{
memcpy(message, buffer->peek(), frameLen);
buffer->retrieve(frameLen);
message[1] = receiveTime.microSecondsSinceEpoch();
conn->send(message, sizeof message);
}
}
void runServer(uint16_t port)
{
EventLoop loop;
TcpServer server(&loop, InetAddress(port), "ClockServer");
server.setConnectionCallback(serverConnectionCallback);
server.setMessageCallback(serverMessageCallback);
server.start();
loop.loop();
}
TcpConnectionPtr clientConnection;
void clientConnectionCallback(const TcpConnectionPtr& conn)
{
LOG_TRACE << conn->localAddress().toIpPort() << " -> "
<< conn->peerAddress().toIpPort() << " is "
<< (conn->connected() ? "UP" : "DOWN");
if (conn->connected())
{
clientConnection = conn;
conn->setTcpNoDelay(true);
}
else
{
clientConnection.reset();
}
}
void clientMessageCallback(const TcpConnectionPtr&,
Buffer* buffer,
muduo::Timestamp receiveTime)
{
int64_t message[2];
while (buffer->readableBytes() >= frameLen)
{
memcpy(message, buffer->peek(), frameLen);
buffer->retrieve(frameLen);
int64_t send = message[0];
int64_t their = message[1];
int64_t back = receiveTime.microSecondsSinceEpoch();
int64_t mine = (back+send)/2;
LOG_INFO << "round trip " << back - send
<< " clock error " << their - mine;
}
}
void sendMyTime()
{
if (clientConnection)
{
int64_t message[2] = { 0, 0 };
message[0] = Timestamp::now().microSecondsSinceEpoch();
clientConnection->send(message, sizeof message);
}
}
void runClient(const char* ip, uint16_t port)
{
EventLoop loop;
TcpClient client(&loop, InetAddress(ip, port), "ClockClient");
client.enableRetry();
client.setConnectionCallback(clientConnectionCallback);
client.setMessageCallback(clientMessageCallback);
client.connect();
loop.runEvery(0.2, sendMyTime);
loop.loop();
}
int main(int argc, char* argv[])
{
if (argc > 2)
{
uint16_t port = static_cast(atoi(argv[2]));
if (strcmp(argv[1], "-s") == 0)
{
runServer(port);
}
else
{
runClient(argv[1], port);
}
}
else
{
printf("Usage:\n%s -s port\n%s ip port\n", argv[0], argv[0]);
}
}