daemon/face/udp-channel.cpp - ndnSIM - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
  * Copyright (C) 2014 Named Data Networking Project
  * See COPYING for copyright and distribution information.
  */

 #include "udp-channel.hpp"
 #include "core/global-io.hpp"
 #include "core/face-uri.hpp"

 namespace nfd {

 NFD_LOG_INIT("UdpChannel");

 using namespace boost::asio;

 UdpChannel::UdpChannel(const udp::Endpoint& localEndpoint,
                        const time::seconds& timeout)
   : m_localEndpoint(localEndpoint)
   , m_isListening(false)
   , m_idleFaceTimeout(timeout)
 {
   /// \todo the reuse_address works as we want in Linux, but in other system could be different.
   ///       We need to check this
   ///       (SO_REUSEADDR doesn't behave uniformly in different OS)

   m_socket = make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));
   m_socket->open(m_localEndpoint.protocol());
   m_socket->set_option(boost::asio::ip::udp::socket::reuse_address(true));
   if (m_localEndpoint.address().is_v6())
     {
       m_socket->set_option(ip::v6_only(true));
     }

   try {
     m_socket->bind(m_localEndpoint);
   }
   catch (boost::system::system_error& e) {
     //The bind failed, so the socket is useless now
     m_socket->close();
     throw Error("Failed to properly configure the socket. "
                 "UdpChannel creation aborted, check the address (" + std::string(e.what()) + ")");
   }

   this->setUri(FaceUri(localEndpoint));

   //setting the timeout to close the idle faces
   m_closeIdleFaceEvent = scheduler::schedule(m_idleFaceTimeout,
                                 bind(&UdpChannel::closeIdleFaces, this));
 }

 UdpChannel::~UdpChannel()
 {
   scheduler::cancel(m_closeIdleFaceEvent);
 }

 void
 UdpChannel::listen(const FaceCreatedCallback& onFaceCreated,
                    const ConnectFailedCallback& onListenFailed)
 {
   if (m_isListening) {
     throw Error("Listen already called on this channel");
   }
   m_isListening = true;

   onFaceCreatedNewPeerCallback = onFaceCreated;
   onConnectFailedNewPeerCallback = onListenFailed;

   m_socket->async_receive_from(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE),
                                m_newRemoteEndpoint,
                                bind(&UdpChannel::newPeer, this,
                                     boost::asio::placeholders::error,
                                     boost::asio::placeholders::bytes_transferred));
 }


 void
 UdpChannel::connect(const udp::Endpoint& remoteEndpoint,
                     const FaceCreatedCallback& onFaceCreated,
                     const ConnectFailedCallback& onConnectFailed)
 {
   ChannelFaceMap::iterator i = m_channelFaces.find(remoteEndpoint);
   if (i != m_channelFaces.end()) {
     i->second->setOnDemand(false);
     onFaceCreated(i->second);
     return;
   }

   //creating a new socket for the face that will be created soon
   shared_ptr<ip::udp::socket> clientSocket =
     make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));

   clientSocket->open(m_localEndpoint.protocol());
   clientSocket->set_option(ip::udp::socket::reuse_address(true));

   try {
     clientSocket->bind(m_localEndpoint);
     clientSocket->connect(remoteEndpoint); //@todo connect or async_connect
     //(since there is no handshake the connect shouldn't block). If we go for
     //async_connect, make sure that if in the meantime we receive a UDP pkt from
     //that endpoint nothing bad happen (it's difficult, but it could happen)
   }
   catch (boost::system::system_error& e) {
     clientSocket->close();
     onConnectFailed("Failed to configure socket (" + std::string(e.what()) + ")");
     return;
   }
   createFace(clientSocket, onFaceCreated, false);
 }

 void
 UdpChannel::connect(const std::string& remoteHost,
                     const std::string& remotePort,
                     const FaceCreatedCallback& onFaceCreated,
                     const ConnectFailedCallback& onConnectFailed)
 {
   ip::udp::resolver::query query(remoteHost, remotePort);
   shared_ptr<ip::udp::resolver> resolver =
   make_shared<ip::udp::resolver>(boost::ref(getGlobalIoService()));

   resolver->async_resolve(query,
                           bind(&UdpChannel::handleEndpointResolution, this, _1, _2,
                                onFaceCreated, onConnectFailed,
                                resolver));
 }

 void
 UdpChannel::handleEndpointResolution(const boost::system::error_code& error,
                                       ip::udp::resolver::iterator remoteEndpoint,
                                       const FaceCreatedCallback& onFaceCreated,
                                       const ConnectFailedCallback& onConnectFailed,
                                       const shared_ptr<ip::udp::resolver>& resolver)
 {
   if (error != 0 ||
       remoteEndpoint == ip::udp::resolver::iterator())
   {
     if (error == boost::system::errc::operation_canceled) // when socket is closed by someone
       return;

     NFD_LOG_DEBUG("Remote endpoint hostname or port cannot be resolved: "
                     << error.category().message(error.value()));

     onConnectFailed("Remote endpoint hostname or port cannot be resolved: " +
                       error.category().message(error.value()));
       return;
   }

   connect(*remoteEndpoint, onFaceCreated, onConnectFailed);
 }

 size_t
 UdpChannel::size() const
 {
   return m_channelFaces.size();
 }


 shared_ptr<UdpFace>
 UdpChannel::createFace(const shared_ptr<ip::udp::socket>& socket,
                        const FaceCreatedCallback& onFaceCreated,
                        bool isOnDemand)
 {
   udp::Endpoint remoteEndpoint = socket->remote_endpoint();

   shared_ptr<UdpFace> face = make_shared<UdpFace>(boost::cref(socket), isOnDemand);
   face->onFail += bind(&UdpChannel::afterFaceFailed, this, remoteEndpoint);

   onFaceCreated(face);
   m_channelFaces[remoteEndpoint] = face;
   return face;
 }

 void
 UdpChannel::newPeer(const boost::system::error_code& error,
                     std::size_t nBytesReceived)
 {
   NFD_LOG_DEBUG("UdpChannel::newPeer from " << m_newRemoteEndpoint);

   shared_ptr<UdpFace> face;

   ChannelFaceMap::iterator i = m_channelFaces.find(m_newRemoteEndpoint);
   if (i != m_channelFaces.end()) {
     //The face already exists.
     //Usually this shouldn't happen, because the channel creates a Udpface
     //as soon as it receives a pkt from a new endpoint and then the
     //traffic is dispatched by the kernel directly to the face.
     //However, if the node receives multiple packets from the same endpoint
     //"at the same time", while the channel is creating the face the kernel
     //could dispatch the other pkts to the channel because the face is not yet
     //ready. In this case, the channel has to pass the pkt to the face

     NFD_LOG_DEBUG("The creation of the face for the remote endpoint "
                   << m_newRemoteEndpoint
                   << " is in progress");

     face = i->second;
   }
   else {
     shared_ptr<ip::udp::socket> clientSocket =
       make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));
     clientSocket->open(m_localEndpoint.protocol());
     clientSocket->set_option(ip::udp::socket::reuse_address(true));
     clientSocket->bind(m_localEndpoint);
     clientSocket->connect(m_newRemoteEndpoint);

     face = createFace(clientSocket,
                       onFaceCreatedNewPeerCallback,
                       true);
   }

   //Passing the message to the correspondent face
   face->handleFirstReceive(m_inputBuffer, nBytesReceived, error);

   m_socket->async_receive_from(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE),
                                m_newRemoteEndpoint,
                                bind(&UdpChannel::newPeer, this,
                                     boost::asio::placeholders::error,
                                     boost::asio::placeholders::bytes_transferred));
 }


 void
 UdpChannel::afterFaceFailed(udp::Endpoint &endpoint)
 {
   NFD_LOG_DEBUG("afterFaceFailed: " << endpoint);
   m_channelFaces.erase(endpoint);
 }

 void
 UdpChannel::closeIdleFaces()
 {
   ChannelFaceMap::iterator next =  m_channelFaces.begin();

   while (next != m_channelFaces.end()) {
     ChannelFaceMap::iterator it = next;
     next++;
     if (it->second->isOnDemand() &&
         !it->second->hasBeenUsedRecently()) {
       //face has been idle since the last time closeIdleFaces
       //has been called. Going to close it
       NFD_LOG_DEBUG("Found idle face id: " << it->second->getId());
       it->second->close();
     } else {
       it->second->resetRecentUsage();
     }
   }
   m_closeIdleFaceEvent = scheduler::schedule(m_idleFaceTimeout,
                                              bind(&UdpChannel::closeIdleFaces, this));
 }

 } // namespace nfd
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/**
	* Copyright (C) 2014 Named Data Networking Project
	* See COPYING for copyright and distribution information.
	*/

	#include "udp-channel.hpp"
	#include "core/global-io.hpp"
	#include "core/face-uri.hpp"

	namespace nfd {

	NFD_LOG_INIT("UdpChannel");

	using namespace boost::asio;

	UdpChannel::UdpChannel(const udp::Endpoint& localEndpoint,
	const time::seconds& timeout)
	: m_localEndpoint(localEndpoint)
	, m_isListening(false)
	, m_idleFaceTimeout(timeout)
	{
	/// \todo the reuse_address works as we want in Linux, but in other system could be different.
	/// We need to check this
	/// (SO_REUSEADDR doesn't behave uniformly in different OS)

	m_socket = make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));
	m_socket->open(m_localEndpoint.protocol());
	m_socket->set_option(boost::asio::ip::udp::socket::reuse_address(true));
	if (m_localEndpoint.address().is_v6())
	{
	m_socket->set_option(ip::v6_only(true));
	}

	try {
	m_socket->bind(m_localEndpoint);
	}
	catch (boost::system::system_error& e) {
	//The bind failed, so the socket is useless now
	m_socket->close();
	throw Error("Failed to properly configure the socket. "
	"UdpChannel creation aborted, check the address (" + std::string(e.what()) + ")");
	}

	this->setUri(FaceUri(localEndpoint));

	//setting the timeout to close the idle faces
	m_closeIdleFaceEvent = scheduler::schedule(m_idleFaceTimeout,
	bind(&UdpChannel::closeIdleFaces, this));
	}

	UdpChannel::~UdpChannel()
	{
	scheduler::cancel(m_closeIdleFaceEvent);
	}

	void
	UdpChannel::listen(const FaceCreatedCallback& onFaceCreated,
	const ConnectFailedCallback& onListenFailed)
	{
	if (m_isListening) {
	throw Error("Listen already called on this channel");
	}
	m_isListening = true;

	onFaceCreatedNewPeerCallback = onFaceCreated;
	onConnectFailedNewPeerCallback = onListenFailed;

	m_socket->async_receive_from(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE),
	m_newRemoteEndpoint,
	bind(&UdpChannel::newPeer, this,
	boost::asio::placeholders::error,
	boost::asio::placeholders::bytes_transferred));
	}


	void
	UdpChannel::connect(const udp::Endpoint& remoteEndpoint,
	const FaceCreatedCallback& onFaceCreated,
	const ConnectFailedCallback& onConnectFailed)
	{
	ChannelFaceMap::iterator i = m_channelFaces.find(remoteEndpoint);
	if (i != m_channelFaces.end()) {
	i->second->setOnDemand(false);
	onFaceCreated(i->second);
	return;
	}

	//creating a new socket for the face that will be created soon
	shared_ptr<ip::udp::socket> clientSocket =
	make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));

	clientSocket->open(m_localEndpoint.protocol());
	clientSocket->set_option(ip::udp::socket::reuse_address(true));

	try {
	clientSocket->bind(m_localEndpoint);
	clientSocket->connect(remoteEndpoint); //@todo connect or async_connect
	//(since there is no handshake the connect shouldn't block). If we go for
	//async_connect, make sure that if in the meantime we receive a UDP pkt from
	//that endpoint nothing bad happen (it's difficult, but it could happen)
	}
	catch (boost::system::system_error& e) {
	clientSocket->close();
	onConnectFailed("Failed to configure socket (" + std::string(e.what()) + ")");
	return;
	}
	createFace(clientSocket, onFaceCreated, false);
	}

	void
	UdpChannel::connect(const std::string& remoteHost,
	const std::string& remotePort,
	const FaceCreatedCallback& onFaceCreated,
	const ConnectFailedCallback& onConnectFailed)
	{
	ip::udp::resolver::query query(remoteHost, remotePort);
	shared_ptr<ip::udp::resolver> resolver =
	make_shared<ip::udp::resolver>(boost::ref(getGlobalIoService()));

	resolver->async_resolve(query,
	bind(&UdpChannel::handleEndpointResolution, this, _1, _2,
	onFaceCreated, onConnectFailed,
	resolver));
	}

	void
	UdpChannel::handleEndpointResolution(const boost::system::error_code& error,
	ip::udp::resolver::iterator remoteEndpoint,
	const FaceCreatedCallback& onFaceCreated,
	const ConnectFailedCallback& onConnectFailed,
	const shared_ptr<ip::udp::resolver>& resolver)
	{
	if (error != 0 \|\|
	remoteEndpoint == ip::udp::resolver::iterator())
	{
	if (error == boost::system::errc::operation_canceled) // when socket is closed by someone
	return;

	NFD_LOG_DEBUG("Remote endpoint hostname or port cannot be resolved: "
	<< error.category().message(error.value()));

	onConnectFailed("Remote endpoint hostname or port cannot be resolved: " +
	error.category().message(error.value()));
	return;
	}

	connect(*remoteEndpoint, onFaceCreated, onConnectFailed);
	}

	size_t
	UdpChannel::size() const
	{
	return m_channelFaces.size();
	}


	shared_ptr<UdpFace>
	UdpChannel::createFace(const shared_ptr<ip::udp::socket>& socket,
	const FaceCreatedCallback& onFaceCreated,
	bool isOnDemand)
	{
	udp::Endpoint remoteEndpoint = socket->remote_endpoint();

	shared_ptr<UdpFace> face = make_shared<UdpFace>(boost::cref(socket), isOnDemand);
	face->onFail += bind(&UdpChannel::afterFaceFailed, this, remoteEndpoint);

	onFaceCreated(face);
	m_channelFaces[remoteEndpoint] = face;
	return face;
	}

	void
	UdpChannel::newPeer(const boost::system::error_code& error,
	std::size_t nBytesReceived)
	{
	NFD_LOG_DEBUG("UdpChannel::newPeer from " << m_newRemoteEndpoint);

	shared_ptr<UdpFace> face;

	ChannelFaceMap::iterator i = m_channelFaces.find(m_newRemoteEndpoint);
	if (i != m_channelFaces.end()) {
	//The face already exists.
	//Usually this shouldn't happen, because the channel creates a Udpface
	//as soon as it receives a pkt from a new endpoint and then the
	//traffic is dispatched by the kernel directly to the face.
	//However, if the node receives multiple packets from the same endpoint
	//"at the same time", while the channel is creating the face the kernel
	//could dispatch the other pkts to the channel because the face is not yet
	//ready. In this case, the channel has to pass the pkt to the face

	NFD_LOG_DEBUG("The creation of the face for the remote endpoint "
	<< m_newRemoteEndpoint
	<< " is in progress");

	face = i->second;
	}
	else {
	shared_ptr<ip::udp::socket> clientSocket =
	make_shared<ip::udp::socket>(boost::ref(getGlobalIoService()));
	clientSocket->open(m_localEndpoint.protocol());
	clientSocket->set_option(ip::udp::socket::reuse_address(true));
	clientSocket->bind(m_localEndpoint);
	clientSocket->connect(m_newRemoteEndpoint);

	face = createFace(clientSocket,
	onFaceCreatedNewPeerCallback,
	true);
	}

	//Passing the message to the correspondent face
	face->handleFirstReceive(m_inputBuffer, nBytesReceived, error);

	m_socket->async_receive_from(boost::asio::buffer(m_inputBuffer, MAX_NDN_PACKET_SIZE),
	m_newRemoteEndpoint,
	bind(&UdpChannel::newPeer, this,
	boost::asio::placeholders::error,
	boost::asio::placeholders::bytes_transferred));
	}


	void
	UdpChannel::afterFaceFailed(udp::Endpoint &endpoint)
	{
	NFD_LOG_DEBUG("afterFaceFailed: " << endpoint);
	m_channelFaces.erase(endpoint);
	}

	void
	UdpChannel::closeIdleFaces()
	{
	ChannelFaceMap::iterator next = m_channelFaces.begin();

	while (next != m_channelFaces.end()) {
	ChannelFaceMap::iterator it = next;
	next++;
	if (it->second->isOnDemand() &&
	!it->second->hasBeenUsedRecently()) {
	//face has been idle since the last time closeIdleFaces
	//has been called. Going to close it
	NFD_LOG_DEBUG("Found idle face id: " << it->second->getId());
	it->second->close();
	} else {
	it->second->resetRecentUsage();
	}
	}
	m_closeIdleFaceEvent = scheduler::schedule(m_idleFaceTimeout,
	bind(&UdpChannel::closeIdleFaces, this));
	}

	} // namespace nfd