Adding nsync for NLSR
diff --git a/nsync/src/sync-logic.cc b/nsync/src/sync-logic.cc
new file mode 100644
index 0000000..ec4d63e
--- /dev/null
+++ b/nsync/src/sync-logic.cc
@@ -0,0 +1,705 @@
+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2012 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ * Chaoyi Bian <bcy@pku.edu.cn>
+ * Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ * Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#include "sync-logic.h"
+#include "sync-diff-leaf.h"
+#include "sync-full-leaf.h"
+#include "sync-logging.h"
+#include "sync-state.h"
+
+#include <boost/foreach.hpp>
+#include <boost/lexical_cast.hpp>
+#include <vector>
+
+using namespace std;
+using namespace ndn;
+
+INIT_LOGGER ("SyncLogic");
+
+
+#ifdef _DEBUG
+#define _LOG_DEBUG_ID(v) _LOG_DEBUG(m_instanceId << " " << v)
+#else
+#define _LOG_DEBUG_ID(v) _LOG_DEBUG(v)
+#endif
+
+#define GET_RANDOM(var) var ()
+
+#define TIME_SECONDS_WITH_JITTER(sec) \
+ (time::seconds(sec) + time::milliseconds(GET_RANDOM (m_reexpressionJitter)))
+
+#define TIME_MILLISECONDS_WITH_JITTER(ms) \
+ (time::seconds(ms) + time::milliseconds(GET_RANDOM (m_reexpressionJitter)))
+
+namespace Sync {
+
+using ndn::shared_ptr;
+
+int SyncLogic::m_instanceCounter = 0;
+
+SyncLogic::SyncLogic (const Name& syncPrefix,
+ shared_ptr<Validator> validator,
+ shared_ptr<Face> face,
+ LogicUpdateCallback onUpdate,
+ LogicRemoveCallback onRemove)
+ : m_state (new FullState)
+ , m_syncInterestTable (*face->ioService(), time::seconds(m_syncInterestReexpress))
+ , m_syncPrefix (syncPrefix)
+ , m_onUpdate (onUpdate)
+ , m_onRemove (onRemove)
+ , m_perBranch (false)
+ , m_validator(validator)
+ , m_keyChain(new KeyChain())
+ , m_face(face)
+ , m_scheduler(*face->ioService())
+ , m_randomGenerator (static_cast<unsigned int> (std::time (0)))
+ , m_rangeUniformRandom (m_randomGenerator, boost::uniform_int<> (200,1000))
+ , m_reexpressionJitter (m_randomGenerator, boost::uniform_int<> (100,500))
+ , m_recoveryRetransmissionInterval (m_defaultRecoveryRetransmitInterval)
+{
+ m_syncRegisteredPrefixId = m_face->setInterestFilter (m_syncPrefix,
+ bind(&SyncLogic::onSyncInterest, this, _1, _2),
+ bind(&SyncLogic::onSyncRegisterFailed, this, _1, _2));
+
+
+ m_reexpressingInterestId = m_scheduler.scheduleEvent (time::seconds (0), // no need to add jitter
+ bind (&SyncLogic::sendSyncInterest, this));
+
+ m_instanceId = string("Instance " + boost::lexical_cast<string>(m_instanceCounter++) + " ");
+}
+
+SyncLogic::SyncLogic (const Name& syncPrefix,
+ shared_ptr<Validator> validator,
+ shared_ptr<Face> face,
+ LogicPerBranchCallback onUpdateBranch)
+ : m_state (new FullState)
+ , m_syncInterestTable (*face->ioService(), time::seconds (m_syncInterestReexpress))
+ , m_syncPrefix (syncPrefix)
+ , m_onUpdateBranch (onUpdateBranch)
+ , m_perBranch(true)
+ , m_validator(validator)
+ , m_keyChain(new KeyChain())
+ , m_face(face)
+ , m_scheduler(*face->ioService())
+ , m_randomGenerator (static_cast<unsigned int> (std::time (0)))
+ , m_rangeUniformRandom (m_randomGenerator, boost::uniform_int<> (200,1000))
+ , m_reexpressionJitter (m_randomGenerator, boost::uniform_int<> (100,500))
+ , m_recoveryRetransmissionInterval (m_defaultRecoveryRetransmitInterval)
+{
+ m_syncRegisteredPrefixId = m_face->setInterestFilter (m_syncPrefix,
+ bind(&SyncLogic::onSyncInterest, this, _1, _2),
+ bind(&SyncLogic::onSyncRegisterFailed, this, _1, _2));
+
+ m_reexpressingInterestId = m_scheduler.scheduleEvent (time::seconds (0), // no need to add jitter
+ bind (&SyncLogic::sendSyncInterest, this));
+}
+
+SyncLogic::~SyncLogic ()
+{
+ m_face->unsetInterestFilter(m_syncRegisteredPrefixId);
+ m_scheduler.cancelEvent (m_reexpressingInterestId);
+ m_scheduler.cancelEvent (m_delayedInterestProcessingId);
+}
+
+/**
+ * Two types of intersts
+ *
+ * Normal name: .../<hash>
+ * Recovery name: .../recovery/<hash>
+ */
+boost::tuple<DigestConstPtr, std::string>
+SyncLogic::convertNameToDigestAndType (const Name &name)
+{
+ BOOST_ASSERT (m_syncPrefix.isPrefixOf(name));
+
+ int nameLengthDiff = name.size() - m_syncPrefix.size();
+ BOOST_ASSERT (nameLengthDiff > 0);
+ BOOST_ASSERT (nameLengthDiff < 3);
+
+ string hash = name.get(-1).toEscapedString();
+ string interestType;
+
+ if(nameLengthDiff == 1)
+ interestType = "normal";
+ else
+ interestType = name.get(-2).toEscapedString();
+
+ _LOG_DEBUG_ID (hash << ", " << interestType);
+
+ DigestPtr digest = boost::make_shared<Digest> ();
+ istringstream is (hash);
+ is >> *digest;
+
+ return make_tuple (digest, interestType);
+}
+
+void
+SyncLogic::onSyncInterest (const Name& prefix, const ndn::Interest& interest)
+{
+ Name name = interest.getName();
+
+ _LOG_DEBUG_ID("respondSyncInterest: " << name);
+
+ try
+ {
+ _LOG_DEBUG_ID ("<< I " << name);
+
+ DigestConstPtr digest;
+ string type;
+ tie (digest, type) = convertNameToDigestAndType (name);
+
+ if (type == "normal") // kind of ineffective...
+ {
+ processSyncInterest (name, digest);
+ }
+ else if (type == "recovery")
+ {
+ processSyncRecoveryInterest (name, digest);
+ }
+ }
+ catch (Error::DigestCalculationError &e)
+ {
+ _LOG_DEBUG_ID ("Something fishy happened...");
+ // log error. ignoring it for now, later we should log it
+ return ;
+ }
+}
+
+void
+SyncLogic::onSyncRegisterFailed(const Name& prefix, const string& msg)
+{
+ _LOG_DEBUG_ID("Sync prefix registration failed! " << msg);
+}
+
+void
+SyncLogic::onSyncData(const ndn::Interest& interest, Data& data)
+{
+ OnDataValidated onValidated = bind(&SyncLogic::onSyncDataValidated, this, _1);
+ OnDataValidationFailed onValidationFailed = bind(&SyncLogic::onSyncDataValidationFailed, this, _1);
+ m_validator->validate(data, onValidated, onValidationFailed);
+}
+
+void
+SyncLogic::onSyncTimeout(const ndn::Interest& interest)
+{
+ // It is OK. Others will handle the time out situation.
+}
+
+void
+SyncLogic::onSyncDataValidationFailed(const shared_ptr<const Data>& data)
+{
+ _LOG_DEBUG_ID("Sync data cannot be verified!");
+}
+
+void
+SyncLogic::onSyncDataValidated(const shared_ptr<const Data>& data)
+{
+ Name name = data->getName();
+ const char* wireData = (const char*)data->getContent().value();
+ size_t len = data->getContent().value_size();
+
+ try
+ {
+ _LOG_DEBUG_ID ("<< D " << name);
+
+ DigestConstPtr digest;
+ string type;
+ tie (digest, type) = convertNameToDigestAndType (name);
+
+ if (type == "normal")
+ {
+ processSyncData (name, digest, wireData, len);
+ }
+ else
+ {
+ // timer is always restarted when we schedule recovery
+ m_scheduler.cancelEvent (m_reexpressingRecoveryInterestId);
+ processSyncData (name, digest, wireData, len);
+ }
+ }
+ catch (Error::DigestCalculationError &e)
+ {
+ _LOG_DEBUG_ID ("Something fishy happened...");
+ // log error. ignoring it for now, later we should log it
+ return;
+ }
+}
+
+void
+SyncLogic::processSyncInterest (const Name &name, DigestConstPtr digest, bool timedProcessing/*=false*/)
+{
+ _LOG_DEBUG_ID("processSyncInterest");
+ DigestConstPtr rootDigest;
+ {
+ rootDigest = m_state->getDigest();
+ }
+
+ // Special case when state is not empty and we have received request with zero-root digest
+ if (digest->isZero () && !rootDigest->isZero ())
+ {
+
+ SyncStateMsg ssm;
+ {
+ ssm << (*m_state);
+ }
+ sendSyncData (name, digest, ssm);
+ return;
+ }
+
+ if (*rootDigest == *digest)
+ {
+ _LOG_DEBUG_ID ("processSyncInterest (): Same state. Adding to PIT");
+ m_syncInterestTable.insert (digest, name.toUri(), false);
+ return;
+ }
+
+ DiffStateContainer::iterator stateInDiffLog = m_log.find (digest);
+
+ if (stateInDiffLog != m_log.end ())
+ {
+ DiffStateConstPtr stateDiff = (*stateInDiffLog)->diff ();
+
+ sendSyncData (name, digest, stateDiff);
+ return;
+ }
+
+ if (!timedProcessing)
+ {
+ bool exists = m_syncInterestTable.insert (digest, name.toUri(), true);
+ if (exists) // somebody else replied, so restart random-game timer
+ {
+ _LOG_DEBUG_ID ("Unknown digest, but somebody may have already replied, so restart our timer");
+ m_scheduler.cancelEvent (m_delayedInterestProcessingId);
+ }
+
+ uint32_t waitDelay = GET_RANDOM (m_rangeUniformRandom);
+ _LOG_DEBUG_ID ("Digest is not in the log. Schedule processing after small delay: " << time::milliseconds (waitDelay));
+
+ m_delayedInterestProcessingId = m_scheduler.scheduleEvent (time::milliseconds (waitDelay),
+ bind (&SyncLogic::processSyncInterest, this, name, digest, true));
+ }
+ else
+ {
+ _LOG_DEBUG_ID (" (timed processing)");
+
+ m_recoveryRetransmissionInterval = m_defaultRecoveryRetransmitInterval;
+ sendSyncRecoveryInterests (digest);
+ }
+}
+
+void
+SyncLogic::processSyncData (const Name &name, DigestConstPtr digest, const char *wireData, size_t len)
+{
+ DiffStatePtr diffLog = boost::make_shared<DiffState> ();
+ bool ownInterestSatisfied = false;
+
+ try
+ {
+
+ m_syncInterestTable.remove (name.toUri()); // Remove satisfied interest from PIT
+
+ ownInterestSatisfied = (name == m_outstandingInterestName);
+
+ DiffState diff;
+ SyncStateMsg msg;
+ if (!msg.ParseFromArray(wireData, len) || !msg.IsInitialized())
+ {
+ //Throw
+ BOOST_THROW_EXCEPTION (Error::SyncStateMsgDecodingFailure () );
+ }
+ msg >> diff;
+
+ vector<MissingDataInfo> v;
+ BOOST_FOREACH (LeafConstPtr leaf, diff.getLeaves().get<ordered>())
+ {
+ DiffLeafConstPtr diffLeaf = boost::dynamic_pointer_cast<const DiffLeaf> (leaf);
+ BOOST_ASSERT (diffLeaf != 0);
+
+ NameInfoConstPtr info = diffLeaf->getInfo();
+ if (diffLeaf->getOperation() == UPDATE)
+ {
+ SeqNo seq = diffLeaf->getSeq();
+
+ bool inserted = false;
+ bool updated = false;
+ SeqNo oldSeq;
+ {
+ boost::tie (inserted, updated, oldSeq) = m_state->update (info, seq);
+ }
+
+ if (inserted || updated)
+ {
+ diffLog->update (info, seq);
+ if (!oldSeq.isValid())
+ {
+ oldSeq = SeqNo(seq.getSession(), 0);
+ }
+ else
+ {
+ ++oldSeq;
+ }
+ // there is no need for application to process update on forwarder node
+ if (info->toString() != forwarderPrefix)
+ {
+ MissingDataInfo mdi = {info->toString(), oldSeq, seq};
+ {
+ ostringstream interestName;
+ interestName << mdi.prefix << "/" << mdi.high.getSession() << "/" << mdi.high.getSeq();
+ _LOG_DEBUG_ID("+++++++++++++++ " + interestName.str());
+ }
+ if (m_perBranch)
+ {
+ ostringstream interestName;
+ interestName << mdi.prefix << "/" << mdi.high.getSession() << "/" << mdi.high.getSeq();
+ m_onUpdateBranch(interestName.str());
+ }
+ else
+ {
+ v.push_back(mdi);
+ }
+ }
+ }
+ }
+ else if (diffLeaf->getOperation() == REMOVE)
+ {
+ if (m_state->remove (info))
+ {
+ diffLog->remove (info);
+ if (!m_perBranch)
+ {
+ m_onRemove (info->toString ());
+ }
+ }
+ }
+ else
+ {
+ }
+ }
+
+ if (!v.empty())
+ {
+ if (!m_perBranch)
+ {
+ m_onUpdate(v);
+ }
+ }
+
+ insertToDiffLog (diffLog);
+ }
+ catch (Error::SyncStateMsgDecodingFailure &e)
+ {
+ _LOG_DEBUG_ID ("Something really fishy happened during state decoding " <<
+ diagnostic_information (e));
+ diffLog.reset ();
+ // don't do anything
+ }
+
+ if ((diffLog != 0 && diffLog->getLeaves ().size () > 0) ||
+ ownInterestSatisfied)
+ {
+ _LOG_DEBUG_ID(" +++++++++++++++ state changed!!!");
+ // Do it only if everything went fine and state changed
+
+ // this is kind of wrong
+ // satisfyPendingSyncInterests (diffLog); // if there are interests in PIT, there is a point to satisfy them using new state
+
+ // if state has changed, then it is safe to express a new interest
+ time::Duration after = time::milliseconds(GET_RANDOM (m_reexpressionJitter));
+ // cout << "------------ reexpress interest after: " << after << endl;
+ EventId eventId = m_scheduler.scheduleEvent (after,
+ bind (&SyncLogic::sendSyncInterest, this));
+
+ m_scheduler.cancelEvent (m_reexpressingInterestId);
+ m_reexpressingInterestId = eventId;
+ }
+}
+
+void
+SyncLogic::processSyncRecoveryInterest (const Name &name, DigestConstPtr digest)
+{
+ _LOG_DEBUG_ID("processSyncRecoveryInterest");
+ DiffStateContainer::iterator stateInDiffLog = m_log.find (digest);
+
+ if (stateInDiffLog == m_log.end ())
+ {
+ _LOG_DEBUG_ID ("Could not find " << *digest << " in digest log");
+ return;
+ }
+
+ SyncStateMsg ssm;
+ {
+ ssm << (*m_state);
+ }
+ sendSyncData (name, digest, ssm);
+}
+
+void
+SyncLogic::satisfyPendingSyncInterests (DiffStateConstPtr diffLog)
+{
+ DiffStatePtr fullStateLog = boost::make_shared<DiffState> ();
+ {
+ BOOST_FOREACH (LeafConstPtr leaf, m_state->getLeaves ()/*.get<timed> ()*/)
+ {
+ fullStateLog->update (leaf->getInfo (), leaf->getSeq ());
+ /// @todo Impose limit on how many state info should be send out
+ }
+ }
+
+ try
+ {
+ uint32_t counter = 0;
+ while (m_syncInterestTable.size () > 0)
+ {
+ Sync::Interest interest = m_syncInterestTable.pop ();
+
+ if (!interest.m_unknown)
+ {
+ _LOG_DEBUG_ID (">> D " << interest.m_name);
+ sendSyncData (interest.m_name, interest.m_digest, diffLog);
+ }
+ else
+ {
+ _LOG_DEBUG_ID (">> D (unknown)" << interest.m_name);
+ sendSyncData (interest.m_name, interest.m_digest, fullStateLog);
+ }
+ counter ++;
+ }
+ _LOG_DEBUG_ID ("Satisfied " << counter << " pending interests");
+ }
+ catch (Error::InterestTableIsEmpty &e)
+ {
+ // ok. not really an error
+ }
+}
+
+void
+SyncLogic::insertToDiffLog (DiffStatePtr diffLog)
+{
+ diffLog->setDigest (m_state->getDigest());
+ if (m_log.size () > 0)
+ {
+ m_log.get<sequenced> ().front ()->setNext (diffLog);
+ }
+ m_log.erase (m_state->getDigest()); // remove diff state with the same digest. next pointers are still valid
+ /// @todo Optimization
+ m_log.get<sequenced> ().push_front (diffLog);
+}
+
+void
+SyncLogic::addLocalNames (const Name &prefix, uint64_t session, uint64_t seq)
+{
+ DiffStatePtr diff;
+ {
+ //cout << "Add local names" <<endl;
+ NameInfoConstPtr info = StdNameInfo::FindOrCreate(prefix.toUri());
+
+ _LOG_DEBUG_ID ("addLocalNames (): old state " << *m_state->getDigest ());
+
+ SeqNo seqN (session, seq);
+ m_state->update(info, seqN);
+
+ _LOG_DEBUG_ID ("addLocalNames (): new state " << *m_state->getDigest ());
+
+ diff = boost::make_shared<DiffState>();
+ diff->update(info, seqN);
+ insertToDiffLog (diff);
+ }
+
+ // _LOG_DEBUG_ID ("PIT size: " << m_syncInterestTable.size ());
+ satisfyPendingSyncInterests (diff);
+}
+
+void
+SyncLogic::remove(const Name &prefix)
+{
+ DiffStatePtr diff;
+ {
+ NameInfoConstPtr info = StdNameInfo::FindOrCreate(prefix.toUri());
+ m_state->remove(info);
+
+ // increment the sequence number for the forwarder node
+ NameInfoConstPtr forwarderInfo = StdNameInfo::FindOrCreate(forwarderPrefix);
+
+ LeafContainer::iterator item = m_state->getLeaves ().find (forwarderInfo);
+ SeqNo seqNo (0);
+ if (item != m_state->getLeaves ().end ())
+ {
+ seqNo = (*item)->getSeq ();
+ ++seqNo;
+ }
+ m_state->update (forwarderInfo, seqNo);
+
+ diff = boost::make_shared<DiffState>();
+ diff->remove(info);
+ diff->update(forwarderInfo, seqNo);
+
+ insertToDiffLog (diff);
+ }
+
+ satisfyPendingSyncInterests (diff);
+}
+
+void
+SyncLogic::sendSyncInterest ()
+{
+ _LOG_DEBUG_ID("sendSyncInterest");
+
+ {
+ m_outstandingInterestName = m_syncPrefix;
+ ostringstream os;
+ os << *m_state->getDigest();
+ m_outstandingInterestName.append(os.str());
+ _LOG_DEBUG_ID (">> I " << m_outstandingInterestName);
+ }
+
+ _LOG_DEBUG_ID("sendSyncInterest: " << m_outstandingInterestName);
+
+ EventId eventId = m_scheduler.scheduleEvent (time::seconds(m_syncInterestReexpress) + time::milliseconds(GET_RANDOM (m_reexpressionJitter)),
+ bind (&SyncLogic::sendSyncInterest, this));
+ m_scheduler.cancelEvent (m_reexpressingInterestId);
+ m_reexpressingInterestId = eventId;
+
+ ndn::Interest interest(m_outstandingInterestName);
+ interest.setMustBeFresh(true);
+
+ m_face->expressInterest(interest,
+ bind(&SyncLogic::onSyncData, this, _1, _2),
+ bind(&SyncLogic::onSyncTimeout, this, _1));
+}
+
+void
+SyncLogic::sendSyncRecoveryInterests (DigestConstPtr digest)
+{
+ ostringstream os;
+ os << *digest;
+
+ Name interestName = m_syncPrefix;
+ interestName.append("recovery").append(os.str());
+
+ time::Duration nextRetransmission = time::milliseconds (m_recoveryRetransmissionInterval + GET_RANDOM (m_reexpressionJitter));
+
+ m_recoveryRetransmissionInterval <<= 1;
+
+ m_scheduler.cancelEvent (m_reexpressingRecoveryInterestId);
+ if (m_recoveryRetransmissionInterval < 100*1000) // <100 seconds
+ m_reexpressingRecoveryInterestId = m_scheduler.scheduleEvent (nextRetransmission,
+ bind (&SyncLogic::sendSyncRecoveryInterests, this, digest));
+
+ ndn::Interest interest(interestName);
+ interest.setMustBeFresh(true);
+
+ m_face->expressInterest(interest,
+ bind(&SyncLogic::onSyncData, this, _1, _2),
+ bind(&SyncLogic::onSyncTimeout, this, _1));
+}
+
+
+void
+SyncLogic::sendSyncData (const Name &name, DigestConstPtr digest, StateConstPtr state)
+{
+ SyncStateMsg msg;
+ msg << (*state);
+ sendSyncData(name, digest, msg);
+}
+
+// pass in state msg instead of state, so that there is no need to lock the state until
+// this function returns
+void
+SyncLogic::sendSyncData (const Name &name, DigestConstPtr digest, SyncStateMsg &ssm)
+{
+ _LOG_DEBUG_ID (">> D " << name);
+ int size = ssm.ByteSize();
+ char *wireData = new char[size];
+ ssm.SerializeToArray(wireData, size);
+
+ Data syncData(name);
+ syncData.setContent(reinterpret_cast<const uint8_t*>(wireData), size);
+ syncData.setFreshnessPeriod(m_syncResponseFreshness);
+
+ m_keyChain->sign(syncData);
+
+ m_face->put(syncData);
+
+ delete []wireData;
+
+ // checking if our own interest got satisfied
+ bool satisfiedOwnInterest = false;
+ {
+ satisfiedOwnInterest = (m_outstandingInterestName == name);
+ }
+
+ if (satisfiedOwnInterest)
+ {
+ _LOG_DEBUG_ID ("Satisfied our own Interest. Re-expressing (hopefully with a new digest)");
+
+ time::Duration after = time::milliseconds(GET_RANDOM (m_reexpressionJitter));
+ // cout << "------------ reexpress interest after: " << after << endl;
+ EventId eventId = m_scheduler.scheduleEvent (after,
+ bind (&SyncLogic::sendSyncInterest, this));
+ m_scheduler.cancelEvent (m_reexpressingInterestId);
+ m_reexpressingInterestId = eventId;
+ }
+}
+
+string
+SyncLogic::getRootDigest()
+{
+ ostringstream os;
+ os << *m_state->getDigest();
+ return os.str();
+}
+
+size_t
+SyncLogic::getNumberOfBranches () const
+{
+ return m_state->getLeaves ().size ();
+}
+
+void
+SyncLogic::printState () const
+{
+ BOOST_FOREACH (const boost::shared_ptr<Sync::Leaf> leaf, m_state->getLeaves ())
+ {
+ std::cout << *leaf << std::endl;
+ }
+}
+
+std::map<std::string, bool>
+SyncLogic::getBranchPrefixes() const
+{
+ std::map<std::string, bool> m;
+
+ BOOST_FOREACH (const boost::shared_ptr<Sync::Leaf> leaf, m_state->getLeaves ())
+ {
+ std::string prefix = leaf->getInfo()->toString();
+ // do not return forwarder prefix
+ if (prefix != forwarderPrefix)
+ {
+ m.insert(pair<std::string, bool>(prefix, false));
+ }
+ }
+
+ return m;
+}
+
+}