96 lines
3.3 KiB
C++
96 lines
3.3 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2016-2022, Regents of the University of California,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University.
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*
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* This file is part of ndn-tools (Named Data Networking Essential Tools).
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* See AUTHORS.md for complete list of ndn-tools authors and contributors.
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*
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* ndn-tools is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* ndn-tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* ndn-tools, e.g., in COPYING.md file. If not, see <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 Wentao Shang
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* @author Steve DiBenedetto
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* @author Andrea Tosatto
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* @author Chavoosh Ghasemi
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*/
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#include "discover-version.hpp"
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#include "data-fetcher.hpp"
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#include <ndn-cxx/metadata-object.hpp>
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namespace ndn::chunks {
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DiscoverVersion::DiscoverVersion(Face& face, const Name& prefix, const Options& options)
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: m_face(face)
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, m_prefix(prefix)
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, m_options(options)
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{
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}
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void
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DiscoverVersion::run()
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{
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if (m_options.disableVersionDiscovery || (!m_prefix.empty() && m_prefix[-1].isVersion())) {
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onDiscoverySuccess(m_prefix);
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return;
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}
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Interest interest = MetadataObject::makeDiscoveryInterest(m_prefix)
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.setInterestLifetime(m_options.interestLifetime);
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m_fetcher = DataFetcher::fetch(m_face, interest,
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m_options.maxRetriesOnTimeoutOrNack,
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m_options.maxRetriesOnTimeoutOrNack,
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FORWARD_TO_MEM_FN(handleData),
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[this] (const auto&, const auto& reason) {
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onDiscoveryFailure(reason);
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},
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[this] (const auto&, const auto& reason) {
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onDiscoveryFailure(reason);
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},
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m_options.isVerbose);
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}
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void
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DiscoverVersion::handleData(const Interest& interest, const Data& data)
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{
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if (m_options.isVerbose)
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std::cerr << "Data: " << data << "\n";
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// make a metadata object from received metadata packet
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MetadataObject mobject;
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try {
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mobject = MetadataObject(data);
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}
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catch (const tlv::Error& e) {
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onDiscoveryFailure("Invalid metadata packet: "s + e.what());
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return;
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}
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if (mobject.getVersionedName().empty() || !mobject.getVersionedName()[-1].isVersion()) {
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onDiscoveryFailure(mobject.getVersionedName().toUri() + " is not a valid versioned name");
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return;
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}
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if (m_options.isVerbose) {
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std::cerr << "Discovered Data version: " << mobject.getVersionedName()[-1] << "\n";
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}
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onDiscoverySuccess(mobject.getVersionedName());
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}
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} // namespace ndn::chunks
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