NS-3 based Named Data Networking (NDN) simulator
ndnSIM 2.5: NDN, CCN, CCNx, content centric networks
API Documentation
readvertise.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2014-2019, Regents of the University of California,
4  * Arizona Board of Regents,
5  * Colorado State University,
6  * University Pierre & Marie Curie, Sorbonne University,
7  * Washington University in St. Louis,
8  * Beijing Institute of Technology,
9  * The University of Memphis.
10  *
11  * This file is part of NFD (Named Data Networking Forwarding Daemon).
12  * See AUTHORS.md for complete list of NFD authors and contributors.
13  *
14  * NFD is free software: you can redistribute it and/or modify it under the terms
15  * of the GNU General Public License as published by the Free Software Foundation,
16  * either version 3 of the License, or (at your option) any later version.
17  *
18  * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
19  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
20  * PURPOSE. See the GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License along with
23  * NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
24  */
25 
26 #include "readvertise.hpp"
27 #include "common/global.hpp"
28 #include "common/logger.hpp"
29 
30 #include <ndn-cxx/util/random.hpp>
31 
32 namespace nfd {
33 namespace rib {
34 
36 
37 const time::milliseconds Readvertise::RETRY_DELAY_MIN = 50_s;
38 const time::milliseconds Readvertise::RETRY_DELAY_MAX = 1_h;
39 
40 static time::milliseconds
42 {
43  std::uniform_int_distribution<> dist(-5, 5);
44  auto newTime = baseTimer + time::milliseconds(dist(ndn::random::getRandomNumberEngine()));
45  return std::max(newTime, 0_ms);
46 }
47 
49  unique_ptr<ReadvertisePolicy> policy,
50  unique_ptr<ReadvertiseDestination> destination)
51  : m_policy(std::move(policy))
52  , m_destination(std::move(destination))
53 {
54  m_addRouteConn = rib.afterAddRoute.connect([this] (const auto& r) { this->afterAddRoute(r); });
55  m_removeRouteConn = rib.beforeRemoveRoute.connect([this] (const auto& r) { this->beforeRemoveRoute(r); });
56 
57  m_destination->afterAvailabilityChange.connect([this] (bool isAvailable) {
58  if (isAvailable) {
59  this->afterDestinationAvailable();
60  }
61  else {
62  this->afterDestinationUnavailable();
63  }
64  });
65 }
66 
67 void
68 Readvertise::afterAddRoute(const RibRouteRef& ribRoute)
69 {
70  optional<ReadvertiseAction> action = m_policy->handleNewRoute(ribRoute);
71  if (!action) {
72  NFD_LOG_DEBUG("add-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
73  ',' << ribRoute.route->origin << ") not-readvertising");
74  return;
75  }
76 
77  ReadvertisedRouteContainer::iterator rrIt;
78  bool isNew = false;
79  std::tie(rrIt, isNew) = m_rrs.emplace(action->prefix);
80 
81  if (!isNew && rrIt->signer != action->signer) {
82  NFD_LOG_WARN("add-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
83  ',' << ribRoute.route->origin << ") readvertising-as " << action->prefix <<
84  " old-signer " << rrIt->signer << " new-signer " << action->signer);
85  }
86  rrIt->signer = action->signer;
87 
88  RouteRrIndex::iterator indexIt;
89  std::tie(indexIt, isNew) = m_routeToRr.emplace(ribRoute, rrIt);
90  BOOST_ASSERT(isNew);
91 
92  if (rrIt->nRibRoutes++ > 0) {
93  NFD_LOG_DEBUG("add-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
94  ',' << ribRoute.route->origin << ") already-readvertised-as " << action->prefix);
95  return;
96  }
97 
98  NFD_LOG_DEBUG("add-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
99  ',' << ribRoute.route->origin << ") readvertising-as " << action->prefix <<
100  " signer " << action->signer);
101  rrIt->retryDelay = RETRY_DELAY_MIN;
102  this->advertise(rrIt);
103 }
104 
105 void
106 Readvertise::beforeRemoveRoute(const RibRouteRef& ribRoute)
107 {
108  auto indexIt = m_routeToRr.find(ribRoute);
109  if (indexIt == m_routeToRr.end()) {
110  NFD_LOG_DEBUG("remove-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
111  ',' << ribRoute.route->origin << ") not-readvertised");
112  return;
113  }
114 
115  auto rrIt = indexIt->second;
116  m_routeToRr.erase(indexIt);
117 
118  if (--rrIt->nRibRoutes > 0) {
119  NFD_LOG_DEBUG("remove-route " << ribRoute.entry->getName() << '(' << ribRoute.route->faceId <<
120  ',' << ribRoute.route->origin << ") needed-by " << rrIt->nRibRoutes);
121  return;
122  }
123 
124  rrIt->retryDelay = RETRY_DELAY_MIN;
125  this->withdraw(rrIt);
126 }
127 
128 void
129 Readvertise::afterDestinationAvailable()
130 {
131  for (auto rrIt = m_rrs.begin(); rrIt != m_rrs.end(); ++rrIt) {
132  rrIt->retryDelay = RETRY_DELAY_MIN;
133  this->advertise(rrIt);
134  }
135 }
136 
137 void
138 Readvertise::afterDestinationUnavailable()
139 {
140  for (auto rrIt = m_rrs.begin(); rrIt != m_rrs.end();) {
141  if (rrIt->nRibRoutes > 0) {
142  rrIt->retryEvt.cancel(); // stop retrying or refreshing
143  ++rrIt;
144  }
145  else {
146  rrIt = m_rrs.erase(rrIt); // assume withdraw has completed
147  }
148  }
149 }
150 
151 void
152 Readvertise::advertise(ReadvertisedRouteContainer::iterator rrIt)
153 {
154  BOOST_ASSERT(rrIt->nRibRoutes > 0);
155 
156  if (!m_destination->isAvailable()) {
157  NFD_LOG_DEBUG("advertise " << rrIt->prefix << " destination-unavailable");
158  return;
159  }
160 
161  m_destination->advertise(*rrIt,
162  [=] {
163  NFD_LOG_DEBUG("advertise " << rrIt->prefix << " success");
164  rrIt->retryDelay = RETRY_DELAY_MIN;
165  rrIt->retryEvt = getScheduler().schedule(randomizeTimer(m_policy->getRefreshInterval()),
166  [=] { advertise(rrIt); });
167  },
168  [=] (const std::string& msg) {
169  NFD_LOG_DEBUG("advertise " << rrIt->prefix << " failure " << msg);
170  rrIt->retryDelay = std::min(RETRY_DELAY_MAX, rrIt->retryDelay * 2);
171  rrIt->retryEvt = getScheduler().schedule(randomizeTimer(rrIt->retryDelay),
172  [=] { advertise(rrIt); });
173  });
174 }
175 
176 void
177 Readvertise::withdraw(ReadvertisedRouteContainer::iterator rrIt)
178 {
179  BOOST_ASSERT(rrIt->nRibRoutes == 0);
180 
181  if (!m_destination->isAvailable()) {
182  NFD_LOG_DEBUG("withdraw " << rrIt->prefix << " destination-unavailable");
183  m_rrs.erase(rrIt);
184  return;
185  }
186 
187  m_destination->withdraw(*rrIt,
188  [=] {
189  NFD_LOG_DEBUG("withdraw " << rrIt->prefix << " success");
190  m_rrs.erase(rrIt);
191  },
192  [=] (const std::string& msg) {
193  NFD_LOG_DEBUG("withdraw " << rrIt->prefix << " failure " << msg);
194  rrIt->retryDelay = std::min(RETRY_DELAY_MAX, rrIt->retryDelay * 2);
195  rrIt->retryEvt = getScheduler().schedule(randomizeTimer(rrIt->retryDelay),
196  [=] { withdraw(rrIt); });
197  });
198 }
199 
200 } // namespace rib
201 } // namespace nfd
represents the Routing Information Base
Definition: rib.hpp:59
#define NFD_LOG_INIT(name)
Definition: logger.hpp:31
signal::Signal< Rib, RibRouteRef > beforeRemoveRoute
signals before a route is removed
Definition: rib.hpp:232
STL namespace.
Readvertise(Rib &rib, unique_ptr< ReadvertisePolicy > policy, unique_ptr< ReadvertiseDestination > destination)
Definition: readvertise.cpp:48
RibEntry::const_iterator route
Definition: rib.hpp:46
references a route
Definition: rib.hpp:43
signal::Signal< Rib, RibRouteRef > afterAddRoute
signals after a Route is added
Definition: rib.hpp:228
Scheduler & getScheduler()
Returns the global Scheduler instance for the calling thread.
Definition: global.cpp:70
Copyright (c) 2011-2015 Regents of the University of California.
Definition: ndn-common.hpp:39
shared_ptr< RibEntry > entry
Definition: rib.hpp:45
RandomNumberEngine & getRandomNumberEngine()
Returns a reference to a thread-local instance of a properly seeded PRNG.
Definition: random.cpp:54
#define NFD_LOG_DEBUG
Definition: logger.hpp:38
readvertise a subset of routes to a destination according to a policy
Definition: readvertise.hpp:44
static time::milliseconds randomizeTimer(time::milliseconds baseTimer)
Definition: readvertise.cpp:41
#define NFD_LOG_WARN
Definition: logger.hpp:40
boost::chrono::milliseconds milliseconds
Definition: time.hpp:48