face: Refactor Face as LinkService+Transport

LpFace: new Face implementation
LpFaceWrapper: allows new Face system to work with old Face system

Eventually, LpFace will be renamed to Face and LpFaceWrapper will be removed.

refs #3088 #3179

Change-Id: Ia4ad7c84631e65b444d4f24e1d7593392927c8db
diff --git a/daemon/face/lp-face-wrapper.cpp b/daemon/face/lp-face-wrapper.cpp
new file mode 100644
index 0000000..920997a
--- /dev/null
+++ b/daemon/face/lp-face-wrapper.cpp
@@ -0,0 +1,102 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD 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.
+ *
+ * NFD 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
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "lp-face-wrapper.hpp"
+
+namespace nfd {
+namespace face {
+
+LpFaceWrapper::LpFaceWrapper(unique_ptr<LpFace> face)
+  : Face(face->getRemoteUri(), face->getLocalUri(),
+         face->getScope() == ndn::nfd::FACE_SCOPE_LOCAL,
+         face->getLinkType() == ndn::nfd::LINK_TYPE_MULTI_ACCESS)
+  , m_face(std::move(face))
+{
+  this->Face::setPersistency(m_face->getPersistency());
+  m_face->afterReceiveInterest.connect(bind(&LpFaceWrapper::dispatchInterest, this, _1));
+  m_face->afterReceiveData.connect(bind(&LpFaceWrapper::dispatchData, this, _1));
+  m_face->afterReceiveNack.connect(bind(&LpFaceWrapper::dispatchNack, this, _1));
+  m_face->afterStateChange.connect(bind(&LpFaceWrapper::handleStateChange, this, _1, _2));
+}
+
+void
+LpFaceWrapper::setPersistency(ndn::nfd::FacePersistency persistency)
+{
+  this->Face::setPersistency(persistency);
+  m_face->setPersistency(persistency);
+}
+
+void
+LpFaceWrapper::setId(nfd::FaceId faceId)
+{
+  this->Face::setId(faceId);
+
+  FaceId lpId = static_cast<FaceId>(faceId);
+  if (faceId == nfd::INVALID_FACEID) {
+    lpId = INVALID_FACEID;
+  }
+  m_face->setId(lpId);
+}
+
+void
+LpFaceWrapper::dispatchInterest(const Interest& interest)
+{
+  this->emitSignal(onReceiveInterest, interest);
+}
+
+void
+LpFaceWrapper::dispatchData(const Data& data)
+{
+  this->emitSignal(onReceiveData, data);
+}
+
+void
+LpFaceWrapper::dispatchNack(const ndn::lp::Nack& nack)
+{
+  this->emitSignal(onReceiveNack, nack);
+}
+
+void
+LpFaceWrapper::handleStateChange(FaceState oldState, FaceState newState)
+{
+  if (newState != FaceState::CLOSED) {
+    return;
+  }
+
+  switch (oldState) {
+  case FaceState::CLOSING:
+    this->fail("LpFace closed");
+    break;
+  case FaceState::FAILED:
+    this->fail("LpFace failed");
+    break;
+  default:
+    BOOST_ASSERT(false);
+    break;
+  }
+}
+
+} // namespace face
+} // namespace nfd