103 lines
3.8 KiB
C++
103 lines
3.8 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2013-2018 Regents of the University of California.
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*
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* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
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*
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* ndn-cxx library is free software: you can redistribute it and/or modify it under the
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* terms of the GNU Lesser General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later version.
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*
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* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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*
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* You should have received copies of the GNU General Public License and GNU Lesser
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* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
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*
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* @author Alexander Afanasyev <http://lasr.cs.ucla.edu/afanasyev/index.html>
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*/
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#include <ndn-cxx/face.hpp>
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#include <string>
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#include <ndn-cxx/security/key-chain.hpp>
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#include <iostream>
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// Enclosing code in ndn simplifies coding (can also use `using namespace ndn`)
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namespace ndn {
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// Additional nested namespaces can be used to prevent/limit name conflicts
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namespace examples {
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class Consumer : noncopyable {
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public:
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void
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run() {
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Interest interest(Name("/example/testApp/randomData"));
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// 如果需要传递参数，可以通过一下方式传递
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std::string param = "{\"code\": 1, \"msg\": \"balabala\"}";
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interest.setApplicationParameters(reinterpret_cast<const uint8_t *>(param.data()), param.size());
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// 设置兴趣包的生存期，超过这个生存期没有收到对应的数据包，兴趣包就会触发超时
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interest.setInterestLifetime(2_s); // 2 seconds
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// 设置如果强制刷新，则不会命中途中路由器的缓存
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interest.setMustBeFresh(true);
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mKeyChain.sign(interest);
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// 发送兴趣包
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m_face.expressInterest(interest,
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bind(&Consumer::onData, this, _1, _2),
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bind(&Consumer::onNack, this, _1, _2),
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bind(&Consumer::onTimeout, this, _1));
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std::cout << "Sending " << interest << std::endl;
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// 需要调用processEvents处理NDN事件，这样才能处理收到的数据包，要不然程序就直接退出了
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// 这个操作会一直阻塞，直到处理完所有的NDN事件
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// processEvents will block until the requested data received or timeout occurs
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m_face.processEvents();
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}
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private:
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void
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onData(const Interest &interest, const Data &data) {
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std::cout << data << std::endl;
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}
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void
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onNack(const Interest &interest, const lp::Nack &nack) {
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std::cout << "received Nack with reason " << nack.getReason()
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<< " for interest " << interest << std::endl;
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}
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void
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onTimeout(const Interest &interest) {
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std::cout << "Timeout " << interest << std::endl;
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}
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private:
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Face m_face;
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KeyChain mKeyChain;
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};
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} // namespace examples
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} // namespace ndn
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int
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main(int argc, char **argv) {
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ndn::examples::Consumer consumer;
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try {
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consumer.run();
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}
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catch (const std::exception &e) {
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std::cerr << "ERROR: " << e.what() << std::endl;
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}
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return 0;
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}
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