chunks: segmented file transfer
refs #3071
Change-Id: I88e4fc1a8e33a0d61a95e2291cccc7b998647489
diff --git a/tools/chunks/catchunks/discover-version-iterative.cpp b/tools/chunks/catchunks/discover-version-iterative.cpp
new file mode 100644
index 0000000..4f2f543
--- /dev/null
+++ b/tools/chunks/catchunks/discover-version-iterative.cpp
@@ -0,0 +1,118 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2016, Regents of the University of California,
+ * Colorado State University,
+ * University Pierre & Marie Curie, Sorbonne University.
+ *
+ * This file is part of ndn-tools (Named Data Networking Essential Tools).
+ * See AUTHORS.md for complete list of ndn-tools authors and contributors.
+ *
+ * ndn-tools is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-tools 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
+ * ndn-tools, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Wentao Shang
+ * @author Steve DiBenedetto
+ * @author Andrea Tosatto
+ */
+
+#include "discover-version-iterative.hpp"
+
+namespace ndn {
+namespace chunks {
+
+DiscoverVersionIterative::DiscoverVersionIterative(const Name& prefix, Face& face,
+ const Options& options)
+ : chunks::Options(options)
+ , DiscoverVersion(prefix, face, options)
+ , Options(options)
+ , m_latestVersion(0)
+ , m_latestVersionData(nullptr)
+ , m_foundVersion(false)
+{
+}
+
+void
+DiscoverVersionIterative::run()
+{
+ m_latestVersion = 0;
+ m_foundVersion = false;
+
+ Interest interest(m_prefix);
+ interest.setInterestLifetime(interestLifetime);
+ interest.setMustBeFresh(mustBeFresh);
+ interest.setMinSuffixComponents(3);
+ interest.setMaxSuffixComponents(3);
+ interest.setChildSelector(1);
+
+ expressInterest(interest, maxRetriesOnTimeoutOrNack, maxRetriesOnTimeoutOrNack);
+}
+
+void
+DiscoverVersionIterative::handleData(const Interest& interest, const Data& data)
+{
+ size_t versionindex = m_prefix.size();
+
+ const Name& name = data.getName();
+ Exclude exclude;
+
+ if (isVerbose)
+ std::cerr << "Data: " << data << std::endl;
+
+ BOOST_ASSERT(name.size() > m_prefix.size());
+ if (name[versionindex].isVersion()) {
+ m_latestVersion = name[versionindex].toVersion();
+ m_latestVersionData = make_shared<Data>(data);
+ m_foundVersion = true;
+
+ exclude.excludeBefore(name[versionindex]);
+
+ if (isVerbose)
+ std::cerr << "Discovered version = " << m_latestVersion << std::endl;
+ }
+ else {
+ // didn't find a version number at expected index.
+ m_strayExcludes.excludeOne(name[versionindex]);
+ }
+
+ for (const auto& i : m_strayExcludes) {
+ exclude.excludeOne(i.first);
+ }
+
+ Interest newInterest(interest);
+ newInterest.refreshNonce();
+ newInterest.setExclude(exclude);
+
+ if (m_foundVersion)
+ expressInterest(newInterest, maxRetriesOnTimeoutOrNack, maxRetriesAfterVersionFound);
+ else
+ expressInterest(interest, maxRetriesOnTimeoutOrNack, maxRetriesOnTimeoutOrNack);
+}
+
+void
+DiscoverVersionIterative::handleTimeout(const Interest& interest, const std::string& reason)
+{
+ if (m_foundVersion) {
+ // a version has been found and after a timeout error this version can be used as the latest.
+ if (isVerbose)
+ std::cerr << "Found data with the latest version: " << m_latestVersion << std::endl;
+
+ // we discovered at least one version. assume what we have is the latest.
+ this->emitSignal(onDiscoverySuccess, *m_latestVersionData);
+ }
+ else {
+ DiscoverVersion::handleTimeout(interest, reason);
+ }
+}
+
+} // namespace chunks
+} // namespace ndn