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// EchoServer.cpp
// Implements an Echo server using the LibEvent-based cNetwork API, as a test of that API
#include "Globals.h"
#include <iostream>
#include <string>
#include "OSSupport/Network.h"
/** cTCPLink callbacks that echo everything they receive back to the remote peer. */
class cEchoLinkCallbacks:
public cTCPLink::cCallbacks
{
// cTCPLink::cCallbacks overrides:
virtual void OnLinkCreated(cTCPLinkPtr a_Link) override
{
ASSERT(m_Link == nullptr);
m_Link = a_Link;
}
virtual void OnReceivedData(const char * a_Data, size_t a_Size) override
{
ASSERT(m_Link != nullptr);
// Echo the incoming data back to outgoing data:
LOGD("%p (%s:%d): Data received (%u bytes), echoing back.", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort(), static_cast<unsigned>(a_Size));
m_Link->Send(a_Data, a_Size);
LOGD("Echo queued");
// Search for a Ctrl+Z, if found, drop the connection:
for (size_t i = 0; i < a_Size; i++)
{
if (a_Data[i] == '\x1a')
{
m_Link->Close();
m_Link.reset();
return;
}
}
}
virtual void OnRemoteClosed(void) override
{
ASSERT(m_Link != nullptr);
LOGD("%p (%s:%d): Remote has closed the connection.", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort());
m_Link.reset();
}
virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
{
ASSERT(m_Link != nullptr);
LOGD("%p (%s:%d): Error %d in the cEchoLinkCallbacks: %s", m_Link.get(), m_Link->GetRemoteIP().c_str(), m_Link->GetRemotePort(), a_ErrorCode, a_ErrorMsg.c_str());
m_Link.reset();
}
/** The link attached to this callbacks instance. */
cTCPLinkPtr m_Link;
};
class cEchoServerCallbacks:
public cNetwork::cListenCallbacks
{
virtual cTCPLink::cCallbacksPtr OnIncomingConnection(const AString & a_RemoteIPAddress, UInt16 a_RemotePort)
{
LOGD("New incoming connection(%s:%d).", a_RemoteIPAddress.c_str(), a_RemotePort);
return std::make_shared<cEchoLinkCallbacks>();
}
virtual void OnAccepted(cTCPLink & a_Link) override
{
LOGD("New client accepted (%s:%d), sending welcome message.", a_Link.GetRemoteIP().c_str(), a_Link.GetRemotePort());
// Send a welcome message to each connecting client:
a_Link.Send("Welcome to the simple echo server.\r\n");
LOGD("Welcome message queued.");
}
virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
{
LOGWARNING("An error occured while listening for connections: %d (%s).", a_ErrorCode, a_ErrorMsg.c_str());
}
};
int main()
{
LOGD("EchoServer: starting up");
cServerHandlePtr Server = cNetwork::Listen(9876, std::make_shared<cEchoServerCallbacks>());
if (!Server->IsListening())
{
LOGWARNING("Cannot listen on port 9876");
abort();
}
ASSERT(Server->IsListening());
// Wait for the user to terminate the server:
printf("Press enter to close the server.\n");
AString line;
std::getline(std::cin, line);
// Close the server and all its active connections:
LOG("Server terminating.");
Server->Close();
ASSERT(!Server->IsListening());
LOGD("Server has been closed.");
printf("Press enter to exit test.\n");
std::getline(std::cin, line);
LOG("Network test finished.");
return 0;
}
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