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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2016 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library 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 Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#ifndef NDN_DETAIL_FACE_IMPL_HPP
#define NDN_DETAIL_FACE_IMPL_HPP
#include "../common.hpp"
#include "../face.hpp"
#include "registered-prefix.hpp"
#include "pending-interest.hpp"
#include "container-with-on-empty-signal.hpp"
#include "../util/scheduler.hpp"
#include "../util/config-file.hpp"
#include "../util/signal.hpp"
#include "../transport/transport.hpp"
#include "../transport/unix-transport.hpp"
#include "../transport/tcp-transport.hpp"
#include "../management/nfd-controller.hpp"
#include "../management/nfd-command-options.hpp"
#include "../lp/packet.hpp"
#include "../lp/tags.hpp"
namespace ndn {
using ndn::nfd::ControlParameters;
/**
* @brief implementation detail of Face
*/
class Face::Impl : noncopyable
{
public:
typedef ContainerWithOnEmptySignal<shared_ptr<PendingInterest>> PendingInterestTable;
typedef std::list<shared_ptr<InterestFilterRecord>> InterestFilterTable;
typedef ContainerWithOnEmptySignal<shared_ptr<RegisteredPrefix>> RegisteredPrefixTable;
explicit
Impl(Face& face)
: m_face(face)
, m_scheduler(m_face.getIoService())
, m_processEventsTimeoutEvent(m_scheduler)
{
auto postOnEmptyPitOrNoRegisteredPrefixes = [this] {
this->m_face.getIoService().post([this] { this->onEmptyPitOrNoRegisteredPrefixes(); });
// without this extra "post", transport can get paused (-async_read) and then resumed
// (+async_read) from within onInterest/onData callback. After onInterest/onData
// finishes, there is another +async_read with the same memory block. A few of such
// async_read duplications can cause various effects and result in segfault.
};
m_pendingInterestTable.onEmpty.connect(postOnEmptyPitOrNoRegisteredPrefixes);
m_registeredPrefixTable.onEmpty.connect(postOnEmptyPitOrNoRegisteredPrefixes);
}
public: // consumer
void
asyncExpressInterest(shared_ptr<const Interest> interest,
const DataCallback& afterSatisfied,
const NackCallback& afterNacked,
const TimeoutCallback& afterTimeout)
{
this->ensureConnected(true);
auto entry = m_pendingInterestTable.insert(make_shared<PendingInterest>(
interest, afterSatisfied, afterNacked, afterTimeout, ref(m_scheduler))).first;
(*entry)->setDeleter([this, entry] { m_pendingInterestTable.erase(entry); });
lp::Packet packet;
shared_ptr<lp::NextHopFaceIdTag> nextHopFaceIdTag = interest->getTag<lp::NextHopFaceIdTag>();
if (nextHopFaceIdTag != nullptr) {
packet.add<lp::NextHopFaceIdField>(*nextHopFaceIdTag);
}
packet.add<lp::FragmentField>(std::make_pair(interest->wireEncode().begin(),
interest->wireEncode().end()));
m_face.m_transport->send(packet.wireEncode());
}
void
asyncRemovePendingInterest(const PendingInterestId* pendingInterestId)
{
m_pendingInterestTable.remove_if(MatchPendingInterestId(pendingInterestId));
}
void
asyncRemoveAllPendingInterests()
{
m_pendingInterestTable.clear();
}
void
satisfyPendingInterests(const Data& data)
{
for (auto entry = m_pendingInterestTable.begin(); entry != m_pendingInterestTable.end(); ) {
if ((*entry)->getInterest()->matchesData(data)) {
shared_ptr<PendingInterest> matchedEntry = *entry;
entry = m_pendingInterestTable.erase(entry);
matchedEntry->invokeDataCallback(data);
}
else {
++entry;
}
}
}
void
nackPendingInterests(const lp::Nack& nack)
{
for (auto entry = m_pendingInterestTable.begin(); entry != m_pendingInterestTable.end(); ) {
const Interest& pendingInterest = *(*entry)->getInterest();
if (pendingInterest == nack.getInterest()) {
shared_ptr<PendingInterest> matchedEntry = *entry;
entry = m_pendingInterestTable.erase(entry);
matchedEntry->invokeNackCallback(nack);
}
else {
++entry;
}
}
}
public: // producer
void
asyncSetInterestFilter(shared_ptr<InterestFilterRecord> interestFilterRecord)
{
m_interestFilterTable.push_back(interestFilterRecord);
}
void
asyncUnsetInterestFilter(const InterestFilterId* interestFilterId)
{
InterestFilterTable::iterator i = std::find_if(m_interestFilterTable.begin(),
m_interestFilterTable.end(),
MatchInterestFilterId(interestFilterId));
if (i != m_interestFilterTable.end()) {
m_interestFilterTable.erase(i);
}
}
void
processInterestFilters(Interest& interest)
{
for (const auto& filter : m_interestFilterTable) {
if (filter->doesMatch(interest.getName())) {
filter->invokeInterestCallback(interest);
}
}
}
void
asyncPutData(const shared_ptr<const Data>& data)
{
this->ensureConnected(true);
lp::Packet packet;
shared_ptr<lp::CachePolicyTag> cachePolicyTag = data->getTag<lp::CachePolicyTag>();
if (cachePolicyTag != nullptr) {
packet.add<lp::CachePolicyField>(*cachePolicyTag);
}
packet.add<lp::FragmentField>(std::make_pair(data->wireEncode().begin(),
data->wireEncode().end()));
m_face.m_transport->send(packet.wireEncode());
}
void
asyncPutNack(shared_ptr<const lp::Nack> nack)
{
this->ensureConnected(true);
lp::Packet packet;
packet.add<lp::NackField>(nack->getHeader());
Block interest = nack->getInterest().wireEncode();
packet.add<lp::FragmentField>(std::make_pair(interest.begin(), interest.end()));
m_face.m_transport->send(packet.wireEncode());
}
public: // prefix registration
const RegisteredPrefixId*
registerPrefix(const Name& prefix,
shared_ptr<InterestFilterRecord> filter,
const RegisterPrefixSuccessCallback& onSuccess,
const RegisterPrefixFailureCallback& onFailure,
uint64_t flags,
const nfd::CommandOptions& options)
{
ControlParameters params;
params.setName(prefix);
params.setFlags(flags);
auto prefixToRegister = make_shared<RegisteredPrefix>(prefix, filter, options);
m_face.m_nfdController->start<nfd::RibRegisterCommand>(
params,
[=] (const ControlParameters&) { this->afterPrefixRegistered(prefixToRegister, onSuccess); },
[=] (uint32_t code, const std::string& reason) { onFailure(prefixToRegister->getPrefix(), reason); },
options);
return reinterpret_cast<const RegisteredPrefixId*>(prefixToRegister.get());
}
void
afterPrefixRegistered(shared_ptr<RegisteredPrefix> registeredPrefix,
const RegisterPrefixSuccessCallback& onSuccess)
{
m_registeredPrefixTable.insert(registeredPrefix);
if (registeredPrefix->getFilter() != nullptr) {
// it was a combined operation
m_interestFilterTable.push_back(registeredPrefix->getFilter());
}
if (onSuccess != nullptr) {
onSuccess(registeredPrefix->getPrefix());
}
}
void
asyncUnregisterPrefix(const RegisteredPrefixId* registeredPrefixId,
const UnregisterPrefixSuccessCallback& onSuccess,
const UnregisterPrefixFailureCallback& onFailure)
{
auto i = std::find_if(m_registeredPrefixTable.begin(),
m_registeredPrefixTable.end(),
MatchRegisteredPrefixId(registeredPrefixId));
if (i != m_registeredPrefixTable.end()) {
RegisteredPrefix& record = **i;
const shared_ptr<InterestFilterRecord>& filter = record.getFilter();
if (filter != nullptr) {
// it was a combined operation
m_interestFilterTable.remove(filter);
}
ControlParameters params;
params.setName(record.getPrefix());
m_face.m_nfdController->start<nfd::RibUnregisterCommand>(
params,
[=] (const ControlParameters&) { this->finalizeUnregisterPrefix(i, onSuccess); },
[=] (uint32_t code, const std::string& reason) { onFailure(reason); },
record.getCommandOptions());
}
else {
if (onFailure != nullptr) {
onFailure("Unrecognized PrefixId");
}
}
// there cannot be two registered prefixes with the same id
}
void
finalizeUnregisterPrefix(RegisteredPrefixTable::iterator item,
const UnregisterPrefixSuccessCallback& onSuccess)
{
m_registeredPrefixTable.erase(item);
if (onSuccess != nullptr) {
onSuccess();
}
}
public: // IO routine
void
ensureConnected(bool wantResume)
{
if (!m_face.m_transport->isConnected())
m_face.m_transport->connect(m_face.m_ioService,
[=] (const Block& wire) { m_face.onReceiveElement(wire); });
if (wantResume && !m_face.m_transport->isReceiving()) {
m_face.m_transport->resume();
}
}
void
onEmptyPitOrNoRegisteredPrefixes()
{
if (m_pendingInterestTable.empty() && m_registeredPrefixTable.empty()) {
m_face.m_transport->pause();
if (!m_ioServiceWork) {
m_processEventsTimeoutEvent.cancel();
}
}
}
private:
Face& m_face;
util::Scheduler m_scheduler;
util::scheduler::ScopedEventId m_processEventsTimeoutEvent;
PendingInterestTable m_pendingInterestTable;
InterestFilterTable m_interestFilterTable;
RegisteredPrefixTable m_registeredPrefixTable;
unique_ptr<boost::asio::io_service::work> m_ioServiceWork; // if thread needs to be preserved
friend class Face;
};
} // namespace ndn
#endif // NDN_DETAIL_FACE_IMPL_HPP