daemon/mgmt/face-manager.cpp - ndnSIM/NFD - Gitiles

 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
  * Copyright (c) 2014-2017,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
  *                           Washington University in St. Louis,
  *                           Beijing Institute of Technology,
  *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
  *
  * NFD is free software: you can redistribute it and/or modify it under the terms
  * of the GNU General Public License as published by the Free Software Foundation,
  * either version 3 of the License, or (at your option) any later version.
  *
  * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  * PURPOSE.  See the GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include "face-manager.hpp"
 #include "face/generic-link-service.hpp"
 #include "face/protocol-factory.hpp"
 #include "fw/face-table.hpp"

 #include <ndn-cxx/lp/tags.hpp>
 #include <ndn-cxx/mgmt/nfd/channel-status.hpp>

 namespace nfd {

 NFD_LOG_INIT("FaceManager");

 FaceManager::FaceManager(FaceSystem& faceSystem,
                          Dispatcher& dispatcher, CommandAuthenticator& authenticator)
   : NfdManagerBase(dispatcher, authenticator, "faces")
   , m_faceSystem(faceSystem)
   , m_faceTable(faceSystem.getFaceTable())
 {
   // register handlers for ControlCommand
   registerCommandHandler<ndn::nfd::FaceCreateCommand>("create",
     bind(&FaceManager::createFace, this, _2, _3, _4, _5));

   registerCommandHandler<ndn::nfd::FaceUpdateCommand>("update",
     bind(&FaceManager::updateFace, this, _2, _3, _4, _5));

   registerCommandHandler<ndn::nfd::FaceDestroyCommand>("destroy",
     bind(&FaceManager::destroyFace, this, _2, _3, _4, _5));

   // register handlers for StatusDataset
   registerStatusDatasetHandler("list", bind(&FaceManager::listFaces, this, _1, _2, _3));
   registerStatusDatasetHandler("channels", bind(&FaceManager::listChannels, this, _1, _2, _3));
   registerStatusDatasetHandler("query", bind(&FaceManager::queryFaces, this, _1, _2, _3));

   // register notification stream
   m_postNotification = registerNotificationStream("events");
   m_faceAddConn = m_faceTable.afterAdd.connect([this] (const Face& face) {
     connectFaceStateChangeSignal(face);
     notifyFaceEvent(face, ndn::nfd::FACE_EVENT_CREATED);
   });
   m_faceRemoveConn = m_faceTable.beforeRemove.connect([this] (const Face& face) {
     notifyFaceEvent(face, ndn::nfd::FACE_EVENT_DESTROYED);
   });
 }

 void
 FaceManager::setConfigFile(ConfigFile& configFile)
 {
   m_faceSystem.setConfigFile(configFile);
 }

 void
 FaceManager::createFace(const Name& topPrefix, const Interest& interest,
                         const ControlParameters& parameters,
                         const ndn::mgmt::CommandContinuation& done)
 {
   FaceUri remoteUri;
   if (!remoteUri.parse(parameters.getUri())) {
     NFD_LOG_TRACE("failed to parse remote URI: " << parameters.getUri());
     done(ControlResponse(400, "Malformed command"));
     return;
   }

   if (!remoteUri.isCanonical()) {
     NFD_LOG_TRACE("received non-canonical remote URI: " << remoteUri.toString());
     done(ControlResponse(400, "Non-canonical remote URI"));
     return;
   }

   ndn::optional<FaceUri> localUri;
   if (parameters.hasLocalUri()) {
     localUri = FaceUri{};

     if (!localUri->parse(parameters.getLocalUri())) {
       NFD_LOG_TRACE("failed to parse local URI: " << parameters.getLocalUri());
       done(ControlResponse(400, "Malformed command"));
       return;
     }

     if (!localUri->isCanonical()) {
       NFD_LOG_TRACE("received non-canonical local URI: " << localUri->toString());
       done(ControlResponse(400, "Non-canonical local URI"));
       return;
     }
   }

   face::ProtocolFactory* factory = m_faceSystem.getFactoryByScheme(remoteUri.getScheme());
   if (factory == nullptr) {
     NFD_LOG_TRACE("received create request for unsupported protocol: " << remoteUri.getScheme());
     done(ControlResponse(406, "Unsupported protocol"));
     return;
   }

   try {
     factory->createFace({remoteUri, localUri, parameters.getFacePersistency(),
         parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
         parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED)},
       bind(&FaceManager::afterCreateFaceSuccess, this, parameters, _1, done),
       bind(&FaceManager::afterCreateFaceFailure, this, _1, _2, done));
   }
   catch (const std::runtime_error& error) {
     NFD_LOG_ERROR("Face creation failed: " << error.what());
     done(ControlResponse(500, "Face creation failed due to internal error"));
     return;
   }
   catch (const std::logic_error& error) {
     NFD_LOG_ERROR("Face creation failed: " << error.what());
     done(ControlResponse(500, "Face creation failed due to internal error"));
     return;
   }
 }

 void
 FaceManager::afterCreateFaceSuccess(const ControlParameters& parameters,
                                     const shared_ptr<Face>& face,
                                     const ndn::mgmt::CommandContinuation& done)
 {
   if (face->getId() != face::INVALID_FACEID) {// Face already exists
     NFD_LOG_TRACE("Attempted to create duplicate face of " << face->getId());

     ControlParameters response = collectFaceProperties(*face, true);
     done(ControlResponse(409, "Face with remote URI already exists").setBody(response.wireEncode()));
     return;
   }

   // If scope non-local and flags set to enable local fields, request shouldn't
   // have made it this far
   BOOST_ASSERT(face->getScope() == ndn::nfd::FACE_SCOPE_LOCAL ||
                !parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) ||
                (parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
                 !parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED)));

   m_faceTable.add(face);

   ControlParameters response = collectFaceProperties(*face, true);
   done(ControlResponse(200, "OK").setBody(response.wireEncode()));
 }

 void
 FaceManager::afterCreateFaceFailure(uint32_t status,
                                     const std::string& reason,
                                     const ndn::mgmt::CommandContinuation& done)
 {
   NFD_LOG_DEBUG("Face creation failed: " << reason);

   done(ControlResponse(status, reason));
 }

 void
 FaceManager::updateFace(const Name& topPrefix, const Interest& interest,
                         const ControlParameters& parameters,
                         const ndn::mgmt::CommandContinuation& done)
 {
   FaceId faceId = parameters.getFaceId();
   if (faceId == 0) {
     // Self-updating
     shared_ptr<lp::IncomingFaceIdTag> incomingFaceIdTag = interest.getTag<lp::IncomingFaceIdTag>();
     if (incomingFaceIdTag == nullptr) {
       NFD_LOG_TRACE("unable to determine face for self-update");
       done(ControlResponse(404, "No FaceId specified and IncomingFaceId not available"));
       return;
     }
     faceId = *incomingFaceIdTag;
   }

   Face* face = m_faceTable.get(faceId);

   if (face == nullptr) {
     NFD_LOG_TRACE("invalid face specified");
     done(ControlResponse(404, "Specified face does not exist"));
     return;
   }

   // Verify validity of requested changes
   ControlParameters response;
   bool areParamsValid = true;

   if (parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
       parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
       face->getScope() != ndn::nfd::FACE_SCOPE_LOCAL) {
     NFD_LOG_TRACE("received request to enable local fields on non-local face");
     areParamsValid = false;
     response.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED,
                         parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED));
   }

   // check whether the requested FacePersistency change is valid if it's present
   if (parameters.hasFacePersistency()) {
     auto persistency = parameters.getFacePersistency();
     if (!face->getTransport()->canChangePersistencyTo(persistency)) {
       NFD_LOG_TRACE("cannot change face persistency to " << persistency);
       areParamsValid = false;
       response.setFacePersistency(persistency);
     }
   }

   if (!areParamsValid) {
     done(ControlResponse(409, "Invalid properties specified").setBody(response.wireEncode()));
     return;
   }

   // All specified properties are valid, so make changes
   if (parameters.hasFacePersistency()) {
     face->setPersistency(parameters.getFacePersistency());
   }
   setLinkServiceOptions(*face, parameters, response);

   // Set ControlResponse fields
   response = collectFaceProperties(*face, false);

   done(ControlResponse(200, "OK").setBody(response.wireEncode()));
 }

 void
 FaceManager::destroyFace(const Name& topPrefix, const Interest& interest,
                          const ControlParameters& parameters,
                          const ndn::mgmt::CommandContinuation& done)
 {
   Face* face = m_faceTable.get(parameters.getFaceId());
   if (face != nullptr) {
     face->close();
   }

   done(ControlResponse(200, "OK").setBody(parameters.wireEncode()));
 }

 void
 FaceManager::setLinkServiceOptions(Face& face,
                                    const ControlParameters& parameters,
                                    ControlParameters& response)
 {
   auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
   BOOST_ASSERT(linkService != nullptr);

   auto options = linkService->getOptions();
   if (parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
       face.getScope() == ndn::nfd::FACE_SCOPE_LOCAL) {
     options.allowLocalFields = parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED);
   }
   linkService->setOptions(options);

   // Set Flags for ControlResponse
   response.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, options.allowLocalFields, false);
 }

 ControlParameters
 FaceManager::collectFaceProperties(const Face& face, bool wantUris)
 {
   auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
   BOOST_ASSERT(linkService != nullptr);
   auto options = linkService->getOptions();

   ControlParameters params;
   params.setFaceId(face.getId())
         .setFacePersistency(face.getPersistency())
         .setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, options.allowLocalFields, false);
   if (wantUris) {
     params.setUri(face.getRemoteUri().toString())
           .setLocalUri(face.getLocalUri().toString());
   }
   return params;
 }

 void
 FaceManager::listFaces(const Name& topPrefix, const Interest& interest,
                        ndn::mgmt::StatusDatasetContext& context)
 {
   auto now = time::steady_clock::now();
   for (const Face& face : m_faceTable) {
     ndn::nfd::FaceStatus status = collectFaceStatus(face, now);
     context.append(status.wireEncode());
   }
   context.end();
 }

 void
 FaceManager::listChannels(const Name& topPrefix, const Interest& interest,
                           ndn::mgmt::StatusDatasetContext& context)
 {
   std::set<const face::ProtocolFactory*> factories = m_faceSystem.listProtocolFactories();
   for (const auto* factory : factories) {
     for (const auto& channel : factory->getChannels()) {
       ndn::nfd::ChannelStatus entry;
       entry.setLocalUri(channel->getUri().toString());
       context.append(entry.wireEncode());
     }
   }
   context.end();
 }

 void
 FaceManager::queryFaces(const Name& topPrefix, const Interest& interest,
                         ndn::mgmt::StatusDatasetContext& context)
 {
   ndn::nfd::FaceQueryFilter faceFilter;
   const Name& query = interest.getName();
   try {
     faceFilter.wireDecode(query[-1].blockFromValue());
   }
   catch (const tlv::Error& e) {
     NFD_LOG_DEBUG("Malformed query filter: " << e.what());
     return context.reject(ControlResponse(400, "Malformed filter"));
   }

   auto now = time::steady_clock::now();
   for (const Face& face : m_faceTable) {
     if (!matchFilter(faceFilter, face)) {
       continue;
     }
     ndn::nfd::FaceStatus status = collectFaceStatus(face, now);
     context.append(status.wireEncode());
   }

   context.end();
 }

 bool
 FaceManager::matchFilter(const ndn::nfd::FaceQueryFilter& filter, const Face& face)
 {
   if (filter.hasFaceId() &&
       filter.getFaceId() != static_cast<uint64_t>(face.getId())) {
     return false;
   }

   if (filter.hasUriScheme() &&
       filter.getUriScheme() != face.getRemoteUri().getScheme() &&
       filter.getUriScheme() != face.getLocalUri().getScheme()) {
     return false;
   }

   if (filter.hasRemoteUri() &&
       filter.getRemoteUri() != face.getRemoteUri().toString()) {
     return false;
   }

   if (filter.hasLocalUri() &&
       filter.getLocalUri() != face.getLocalUri().toString()) {
     return false;
   }

   if (filter.hasFaceScope() &&
       filter.getFaceScope() != face.getScope()) {
     return false;
   }

   if (filter.hasFacePersistency() &&
       filter.getFacePersistency() != face.getPersistency()) {
     return false;
   }

   if (filter.hasLinkType() &&
       filter.getLinkType() != face.getLinkType()) {
     return false;
   }

   return true;
 }

 ndn::nfd::FaceStatus
 FaceManager::collectFaceStatus(const Face& face, const time::steady_clock::TimePoint& now)
 {
   ndn::nfd::FaceStatus status;

   collectFaceProperties(face, status);

   time::steady_clock::TimePoint expirationTime = face.getExpirationTime();
   if (expirationTime != time::steady_clock::TimePoint::max()) {
     status.setExpirationPeriod(std::max(time::milliseconds(0),
                                         time::duration_cast<time::milliseconds>(expirationTime - now)));
   }

   const face::FaceCounters& counters = face.getCounters();
   status.setNInInterests(counters.nInInterests)
         .setNOutInterests(counters.nOutInterests)
         .setNInData(counters.nInData)
         .setNOutData(counters.nOutData)
         .setNInNacks(counters.nInNacks)
         .setNOutNacks(counters.nOutNacks)
         .setNInBytes(counters.nInBytes)
         .setNOutBytes(counters.nOutBytes);

   return status;
 }

 template<typename FaceTraits>
 void
 FaceManager::collectFaceProperties(const Face& face, FaceTraits& traits)
 {
   traits.setFaceId(face.getId())
         .setRemoteUri(face.getRemoteUri().toString())
         .setLocalUri(face.getLocalUri().toString())
         .setFaceScope(face.getScope())
         .setFacePersistency(face.getPersistency())
         .setLinkType(face.getLinkType());

   // Set Flag bits
   auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
   if (linkService != nullptr) {
     auto linkServiceOptions = linkService->getOptions();
     traits.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, linkServiceOptions.allowLocalFields);
   }
 }

 void
 FaceManager::notifyFaceEvent(const Face& face, ndn::nfd::FaceEventKind kind)
 {
   ndn::nfd::FaceEventNotification notification;
   notification.setKind(kind);
   collectFaceProperties(face, notification);

   m_postNotification(notification.wireEncode());
 }

 void
 FaceManager::connectFaceStateChangeSignal(const Face& face)
 {
   FaceId faceId = face.getId();
   m_faceStateChangeConn[faceId] = face.afterStateChange.connect(
     [this, faceId] (face::FaceState oldState, face::FaceState newState) {
       const Face& face = *m_faceTable.get(faceId);

       if (newState == face::FaceState::UP) {
         notifyFaceEvent(face, ndn::nfd::FACE_EVENT_UP);
       }
       else if (newState == face::FaceState::DOWN) {
         notifyFaceEvent(face, ndn::nfd::FACE_EVENT_DOWN);
       }
       else if (newState == face::FaceState::CLOSED) {
         m_faceStateChangeConn.erase(faceId);
       }
     });
 }

 } // namespace nfd
	/* -- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -- */
	/*
	* Copyright (c) 2014-2017, Regents of the University of California,
	* Arizona Board of Regents,
	* Colorado State University,
	* University Pierre & Marie Curie, Sorbonne University,
	* Washington University in St. Louis,
	* Beijing Institute of Technology,
	* The University of Memphis.
	*
	* This file is part of NFD (Named Data Networking Forwarding Daemon).
	* See AUTHORS.md for complete list of NFD authors and contributors.
	*
	* NFD is free software: you can redistribute it and/or modify it under the terms
	* of the GNU General Public License as published by the Free Software Foundation,
	* either version 3 of the License, or (at your option) any later version.
	*
	* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
	* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	* PURPOSE. See the GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "face-manager.hpp"
	#include "face/generic-link-service.hpp"
	#include "face/protocol-factory.hpp"
	#include "fw/face-table.hpp"

	#include <ndn-cxx/lp/tags.hpp>
	#include <ndn-cxx/mgmt/nfd/channel-status.hpp>

	namespace nfd {

	NFD_LOG_INIT("FaceManager");

	FaceManager::FaceManager(FaceSystem& faceSystem,
	Dispatcher& dispatcher, CommandAuthenticator& authenticator)
	: NfdManagerBase(dispatcher, authenticator, "faces")
	, m_faceSystem(faceSystem)
	, m_faceTable(faceSystem.getFaceTable())
	{
	// register handlers for ControlCommand
	registerCommandHandler<ndn::nfd::FaceCreateCommand>("create",
	bind(&FaceManager::createFace, this, _2, _3, _4, _5));

	registerCommandHandler<ndn::nfd::FaceUpdateCommand>("update",
	bind(&FaceManager::updateFace, this, _2, _3, _4, _5));

	registerCommandHandler<ndn::nfd::FaceDestroyCommand>("destroy",
	bind(&FaceManager::destroyFace, this, _2, _3, _4, _5));

	// register handlers for StatusDataset
	registerStatusDatasetHandler("list", bind(&FaceManager::listFaces, this, _1, _2, _3));
	registerStatusDatasetHandler("channels", bind(&FaceManager::listChannels, this, _1, _2, _3));
	registerStatusDatasetHandler("query", bind(&FaceManager::queryFaces, this, _1, _2, _3));

	// register notification stream
	m_postNotification = registerNotificationStream("events");
	m_faceAddConn = m_faceTable.afterAdd.connect([this] (const Face& face) {
	connectFaceStateChangeSignal(face);
	notifyFaceEvent(face, ndn::nfd::FACE_EVENT_CREATED);
	});
	m_faceRemoveConn = m_faceTable.beforeRemove.connect([this] (const Face& face) {
	notifyFaceEvent(face, ndn::nfd::FACE_EVENT_DESTROYED);
	});
	}

	void
	FaceManager::setConfigFile(ConfigFile& configFile)
	{
	m_faceSystem.setConfigFile(configFile);
	}

	void
	FaceManager::createFace(const Name& topPrefix, const Interest& interest,
	const ControlParameters& parameters,
	const ndn::mgmt::CommandContinuation& done)
	{
	FaceUri remoteUri;
	if (!remoteUri.parse(parameters.getUri())) {
	NFD_LOG_TRACE("failed to parse remote URI: " << parameters.getUri());
	done(ControlResponse(400, "Malformed command"));
	return;
	}

	if (!remoteUri.isCanonical()) {
	NFD_LOG_TRACE("received non-canonical remote URI: " << remoteUri.toString());
	done(ControlResponse(400, "Non-canonical remote URI"));
	return;
	}

	ndn::optional<FaceUri> localUri;
	if (parameters.hasLocalUri()) {
	localUri = FaceUri{};

	if (!localUri->parse(parameters.getLocalUri())) {
	NFD_LOG_TRACE("failed to parse local URI: " << parameters.getLocalUri());
	done(ControlResponse(400, "Malformed command"));
	return;
	}

	if (!localUri->isCanonical()) {
	NFD_LOG_TRACE("received non-canonical local URI: " << localUri->toString());
	done(ControlResponse(400, "Non-canonical local URI"));
	return;
	}
	}

	face::ProtocolFactory* factory = m_faceSystem.getFactoryByScheme(remoteUri.getScheme());
	if (factory == nullptr) {
	NFD_LOG_TRACE("received create request for unsupported protocol: " << remoteUri.getScheme());
	done(ControlResponse(406, "Unsupported protocol"));
	return;
	}

	try {
	factory->createFace({remoteUri, localUri, parameters.getFacePersistency(),
	parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
	parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED)},
	bind(&FaceManager::afterCreateFaceSuccess, this, parameters, _1, done),
	bind(&FaceManager::afterCreateFaceFailure, this, _1, _2, done));
	}
	catch (const std::runtime_error& error) {
	NFD_LOG_ERROR("Face creation failed: " << error.what());
	done(ControlResponse(500, "Face creation failed due to internal error"));
	return;
	}
	catch (const std::logic_error& error) {
	NFD_LOG_ERROR("Face creation failed: " << error.what());
	done(ControlResponse(500, "Face creation failed due to internal error"));
	return;
	}
	}

	void
	FaceManager::afterCreateFaceSuccess(const ControlParameters& parameters,
	const shared_ptr<Face>& face,
	const ndn::mgmt::CommandContinuation& done)
	{
	if (face->getId() != face::INVALID_FACEID) {// Face already exists
	NFD_LOG_TRACE("Attempted to create duplicate face of " << face->getId());

	ControlParameters response = collectFaceProperties(*face, true);
	done(ControlResponse(409, "Face with remote URI already exists").setBody(response.wireEncode()));
	return;
	}

	// If scope non-local and flags set to enable local fields, request shouldn't
	// have made it this far
	BOOST_ASSERT(face->getScope() == ndn::nfd::FACE_SCOPE_LOCAL \|\|
	!parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) \|\|
	(parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
	!parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED)));

	m_faceTable.add(face);

	ControlParameters response = collectFaceProperties(*face, true);
	done(ControlResponse(200, "OK").setBody(response.wireEncode()));
	}

	void
	FaceManager::afterCreateFaceFailure(uint32_t status,
	const std::string& reason,
	const ndn::mgmt::CommandContinuation& done)
	{
	NFD_LOG_DEBUG("Face creation failed: " << reason);

	done(ControlResponse(status, reason));
	}

	void
	FaceManager::updateFace(const Name& topPrefix, const Interest& interest,
	const ControlParameters& parameters,
	const ndn::mgmt::CommandContinuation& done)
	{
	FaceId faceId = parameters.getFaceId();
	if (faceId == 0) {
	// Self-updating
	shared_ptr<lp::IncomingFaceIdTag> incomingFaceIdTag = interest.getTag<lp::IncomingFaceIdTag>();
	if (incomingFaceIdTag == nullptr) {
	NFD_LOG_TRACE("unable to determine face for self-update");
	done(ControlResponse(404, "No FaceId specified and IncomingFaceId not available"));
	return;
	}
	faceId = *incomingFaceIdTag;
	}

	Face* face = m_faceTable.get(faceId);

	if (face == nullptr) {
	NFD_LOG_TRACE("invalid face specified");
	done(ControlResponse(404, "Specified face does not exist"));
	return;
	}

	// Verify validity of requested changes
	ControlParameters response;
	bool areParamsValid = true;

	if (parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
	parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
	face->getScope() != ndn::nfd::FACE_SCOPE_LOCAL) {
	NFD_LOG_TRACE("received request to enable local fields on non-local face");
	areParamsValid = false;
	response.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED,
	parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED));
	}

	// check whether the requested FacePersistency change is valid if it's present
	if (parameters.hasFacePersistency()) {
	auto persistency = parameters.getFacePersistency();
	if (!face->getTransport()->canChangePersistencyTo(persistency)) {
	NFD_LOG_TRACE("cannot change face persistency to " << persistency);
	areParamsValid = false;
	response.setFacePersistency(persistency);
	}
	}

	if (!areParamsValid) {
	done(ControlResponse(409, "Invalid properties specified").setBody(response.wireEncode()));
	return;
	}

	// All specified properties are valid, so make changes
	if (parameters.hasFacePersistency()) {
	face->setPersistency(parameters.getFacePersistency());
	}
	setLinkServiceOptions(*face, parameters, response);

	// Set ControlResponse fields
	response = collectFaceProperties(*face, false);

	done(ControlResponse(200, "OK").setBody(response.wireEncode()));
	}

	void
	FaceManager::destroyFace(const Name& topPrefix, const Interest& interest,
	const ControlParameters& parameters,
	const ndn::mgmt::CommandContinuation& done)
	{
	Face* face = m_faceTable.get(parameters.getFaceId());
	if (face != nullptr) {
	face->close();
	}

	done(ControlResponse(200, "OK").setBody(parameters.wireEncode()));
	}

	void
	FaceManager::setLinkServiceOptions(Face& face,
	const ControlParameters& parameters,
	ControlParameters& response)
	{
	auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
	BOOST_ASSERT(linkService != nullptr);

	auto options = linkService->getOptions();
	if (parameters.hasFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED) &&
	face.getScope() == ndn::nfd::FACE_SCOPE_LOCAL) {
	options.allowLocalFields = parameters.getFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED);
	}
	linkService->setOptions(options);

	// Set Flags for ControlResponse
	response.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, options.allowLocalFields, false);
	}

	ControlParameters
	FaceManager::collectFaceProperties(const Face& face, bool wantUris)
	{
	auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
	BOOST_ASSERT(linkService != nullptr);
	auto options = linkService->getOptions();

	ControlParameters params;
	params.setFaceId(face.getId())
	.setFacePersistency(face.getPersistency())
	.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, options.allowLocalFields, false);
	if (wantUris) {
	params.setUri(face.getRemoteUri().toString())
	.setLocalUri(face.getLocalUri().toString());
	}
	return params;
	}

	void
	FaceManager::listFaces(const Name& topPrefix, const Interest& interest,
	ndn::mgmt::StatusDatasetContext& context)
	{
	auto now = time::steady_clock::now();
	for (const Face& face : m_faceTable) {
	ndn::nfd::FaceStatus status = collectFaceStatus(face, now);
	context.append(status.wireEncode());
	}
	context.end();
	}

	void
	FaceManager::listChannels(const Name& topPrefix, const Interest& interest,
	ndn::mgmt::StatusDatasetContext& context)
	{
	std::set<const face::ProtocolFactory*> factories = m_faceSystem.listProtocolFactories();
	for (const auto* factory : factories) {
	for (const auto& channel : factory->getChannels()) {
	ndn::nfd::ChannelStatus entry;
	entry.setLocalUri(channel->getUri().toString());
	context.append(entry.wireEncode());
	}
	}
	context.end();
	}

	void
	FaceManager::queryFaces(const Name& topPrefix, const Interest& interest,
	ndn::mgmt::StatusDatasetContext& context)
	{
	ndn::nfd::FaceQueryFilter faceFilter;
	const Name& query = interest.getName();
	try {
	faceFilter.wireDecode(query[-1].blockFromValue());
	}
	catch (const tlv::Error& e) {
	NFD_LOG_DEBUG("Malformed query filter: " << e.what());
	return context.reject(ControlResponse(400, "Malformed filter"));
	}

	auto now = time::steady_clock::now();
	for (const Face& face : m_faceTable) {
	if (!matchFilter(faceFilter, face)) {
	continue;
	}
	ndn::nfd::FaceStatus status = collectFaceStatus(face, now);
	context.append(status.wireEncode());
	}

	context.end();
	}

	bool
	FaceManager::matchFilter(const ndn::nfd::FaceQueryFilter& filter, const Face& face)
	{
	if (filter.hasFaceId() &&
	filter.getFaceId() != static_cast<uint64_t>(face.getId())) {
	return false;
	}

	if (filter.hasUriScheme() &&
	filter.getUriScheme() != face.getRemoteUri().getScheme() &&
	filter.getUriScheme() != face.getLocalUri().getScheme()) {
	return false;
	}

	if (filter.hasRemoteUri() &&
	filter.getRemoteUri() != face.getRemoteUri().toString()) {
	return false;
	}

	if (filter.hasLocalUri() &&
	filter.getLocalUri() != face.getLocalUri().toString()) {
	return false;
	}

	if (filter.hasFaceScope() &&
	filter.getFaceScope() != face.getScope()) {
	return false;
	}

	if (filter.hasFacePersistency() &&
	filter.getFacePersistency() != face.getPersistency()) {
	return false;
	}

	if (filter.hasLinkType() &&
	filter.getLinkType() != face.getLinkType()) {
	return false;
	}

	return true;
	}

	ndn::nfd::FaceStatus
	FaceManager::collectFaceStatus(const Face& face, const time::steady_clock::TimePoint& now)
	{
	ndn::nfd::FaceStatus status;

	collectFaceProperties(face, status);

	time::steady_clock::TimePoint expirationTime = face.getExpirationTime();
	if (expirationTime != time::steady_clock::TimePoint::max()) {
	status.setExpirationPeriod(std::max(time::milliseconds(0),
	time::duration_cast<time::milliseconds>(expirationTime - now)));
	}

	const face::FaceCounters& counters = face.getCounters();
	status.setNInInterests(counters.nInInterests)
	.setNOutInterests(counters.nOutInterests)
	.setNInData(counters.nInData)
	.setNOutData(counters.nOutData)
	.setNInNacks(counters.nInNacks)
	.setNOutNacks(counters.nOutNacks)
	.setNInBytes(counters.nInBytes)
	.setNOutBytes(counters.nOutBytes);

	return status;
	}

	template<typename FaceTraits>
	void
	FaceManager::collectFaceProperties(const Face& face, FaceTraits& traits)
	{
	traits.setFaceId(face.getId())
	.setRemoteUri(face.getRemoteUri().toString())
	.setLocalUri(face.getLocalUri().toString())
	.setFaceScope(face.getScope())
	.setFacePersistency(face.getPersistency())
	.setLinkType(face.getLinkType());

	// Set Flag bits
	auto linkService = dynamic_cast<face::GenericLinkService*>(face.getLinkService());
	if (linkService != nullptr) {
	auto linkServiceOptions = linkService->getOptions();
	traits.setFlagBit(ndn::nfd::BIT_LOCAL_FIELDS_ENABLED, linkServiceOptions.allowLocalFields);
	}
	}

	void
	FaceManager::notifyFaceEvent(const Face& face, ndn::nfd::FaceEventKind kind)
	{
	ndn::nfd::FaceEventNotification notification;
	notification.setKind(kind);
	collectFaceProperties(face, notification);

	m_postNotification(notification.wireEncode());
	}

	void
	FaceManager::connectFaceStateChangeSignal(const Face& face)
	{
	FaceId faceId = face.getId();
	m_faceStateChangeConn[faceId] = face.afterStateChange.connect(
	[this, faceId] (face::FaceState oldState, face::FaceState newState) {
	const Face& face = *m_faceTable.get(faceId);

	if (newState == face::FaceState::UP) {
	notifyFaceEvent(face, ndn::nfd::FACE_EVENT_UP);
	}
	else if (newState == face::FaceState::DOWN) {
	notifyFaceEvent(face, ndn::nfd::FACE_EVENT_DOWN);
	}
	else if (newState == face::FaceState::CLOSED) {
	m_faceStateChangeConn.erase(faceId);
	}
	});
	}

	} // namespace nfd