Create a helper class to provide a wrapper around nfdc.

Refs #3491

Change-Id: I2cc7cbb480a6ca81ee32bbfee47ef060dd8c51f4
diff --git a/ndn/apps/nfdc.py b/ndn/apps/nfdc.py
new file mode 100644
index 0000000..2d38530
--- /dev/null
+++ b/ndn/apps/nfdc.py
@@ -0,0 +1,73 @@
+# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+#
+# Copyright (C) 2015-2018, The University of Memphis,
+#                          Arizona Board of Regents,
+#                          Regents of the University of California.
+#
+# This file is part of Mini-NDN.
+# See AUTHORS.md for a complete list of Mini-NDN authors and contributors.
+#
+# Mini-NDN 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.
+#
+# Mini-NDN 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 Mini-NDN, e.g., in COPYING.md file.
+# If not, see <http://www.gnu.org/licenses/>.
+
+import time
+
+class Nfdc:
+    STRATEGY_ASF = "asf"
+    STRATEGY_BEST_ROUTE = "best-route"
+    STRATEGY_MULTICAST = "multicast"
+    STRATEGY_NCC = "ncc"
+
+    @staticmethod
+    def registerRoute(node, namePrefix, remoteNode, origin=255, cost=0,
+                      inheritFlag=True, captureFlag=False, expirationInMillis=0):
+        node.cmd("nfdc route add {} {} {} {} {}{}{}").format(
+            namePrefix,
+            remoteNode,
+            origin,
+            cost,
+            "no-inherit " if not inheritFlag else "",
+            "capture " if captureFlag else "",
+            "expires {}".format(expirationInMillis)
+        )
+        time.sleep(0.5)
+
+    @staticmethod
+    def unregisterRoute(node, namePrefix, remoteNode, origin=255):
+        node.cmd("nfdc route remove {} {} {}".format(namePrefix, remoteNode, origin))
+        time.sleep(0.5)
+
+    @staticmethod
+    def createFace(node, remoteNode, protocol="udp", isPermanent=False):
+        node.cmd("nfdc face create {}://{} {}".format(
+            protocol,
+            remoteNode,
+            "permanent" if isPermanent else "persistent"
+        ))
+        time.sleep(0.5)
+
+    @staticmethod
+    def destroyFace(node, remoteNode, protocol="udp"):
+        node.cmd("nfdc face destroy {}://{}".format(protocol, remoteNode))
+        time.sleep(0.5)
+
+    @staticmethod
+    def setStrategy(node, namePrefix, strategy):
+        node.cmd("nfdc strategy set {} ndn:/localhost/nfd/strategy/{}".format(namePrefix, strategy))
+        time.sleep(0.5)
+
+    @staticmethod
+    def unsetStrategy(node, namePrefix):
+        node.cmd("nfdc strategy unset {}".format(namePrefix))
+        time.sleep(0.5)
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