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