91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
//
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// Created by sunny on 2020/7/24.
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//
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#include <ndn-cxx/face.hpp>
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#include <ndn-cxx/lp/tags.hpp>
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#include <ndn-cxx/lp/lp-headers.hpp>
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#include <string>
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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("/test/hello/" + std::to_string(1)));
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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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interest.setTag(make_shared<lp::CongestionMarkTag>(1));
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interest.setTag(make_shared<lp::PktTypeTag>(2));
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auto srcTag = make_shared<lp::SrcAddrTag>(lp::SrcAddrHeader(Name("/testSrcAddr")));
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interest.setTag(srcTag);
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srcTag->get().getMyPrefix()->wireEncode();
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interest.setTag(make_shared<lp::DstAddrTag>(lp::DstAddrHeader(Name("/testDstAddr"))));
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interest.setTag(make_shared<lp::BackupNameTag>(lp::BackupNameHeader(Name("/testBackupName"))));
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auto cachePolicy = lp::CachePolicy();
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cachePolicy.setPolicy(lp::CachePolicyType::NO_CACHE);
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interest.setTag(make_shared<lp::CachePolicyTag>(cachePolicy));
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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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};
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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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} |