catchunks: add metadata-based version discovery
refs: #4556
Change-Id: I1100d1a4f14da8e66d190a7909185d67f7aa92a7
diff --git a/tools/chunks/catchunks/discover-version-realtime.cpp b/tools/chunks/catchunks/discover-version-realtime.cpp
new file mode 100644
index 0000000..7175211
--- /dev/null
+++ b/tools/chunks/catchunks/discover-version-realtime.cpp
@@ -0,0 +1,79 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2016-2019, 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 Chavoosh Ghasemi <chghasemi@cs.arizona.edu>
+ */
+
+#include "discover-version-realtime.hpp"
+
+#include <ndn-cxx/metadata-object.hpp>
+
+namespace ndn {
+namespace chunks {
+
+DiscoverVersionRealtime::DiscoverVersionRealtime(const Name& prefix,
+ Face& face,
+ const Options& options)
+ : chunks::Options(options)
+ , DiscoverVersion(prefix, face)
+ , Options(options)
+{
+}
+
+void
+DiscoverVersionRealtime::run()
+{
+ expressInterest(MetadataObject::makeDiscoveryInterest(m_prefix)
+ .setInterestLifetime(discoveryTimeout),
+ maxRetriesOnTimeoutOrNack, maxRetriesOnTimeoutOrNack);
+}
+
+void
+DiscoverVersionRealtime::handleData(const Interest& interest, const Data& data)
+{
+ if (isVerbose)
+ std::cerr << "Data: " << data << std::endl;
+
+ // make a metadata object from received metadata packet
+ MetadataObject mobject;
+ try {
+ mobject = MetadataObject(data);
+ }
+ catch (const tlv::Error& e) {
+ this->emitSignal(onDiscoveryFailure, "Invalid metadata packet: "s + e.what());
+ return;
+ }
+
+ if (mobject.getVersionedName().empty() || !mobject.getVersionedName()[-1].isVersion()) {
+ this->emitSignal(onDiscoveryFailure, mobject.getVersionedName().toUri() +
+ " is not a valid versioned name");
+ return;
+ }
+
+ if (isVerbose) {
+ std::cerr << "Discovered Data version: " << mobject.getVersionedName()[-1].toVersion() << std::endl;
+ }
+ this->emitSignal(onDiscoverySuccess, mobject.getVersionedName());
+}
+
+} // namespace chunks
+} // namespace ndn