VOL-1097 : Ofagent integration for voltha 2.0
- Created a common location for python based components
- Adjusted the ofagent component to interact with voltha 2.0
- Added streaming rpc methods for rcv/send of packets to voltha api
- Adjusted voltha.proto
Change-Id: I47fb7b80878ead060b4b42bd16cb4f8aa384fdb6
diff --git a/python/ofagent/loxi/generic_util.py b/python/ofagent/loxi/generic_util.py
new file mode 100644
index 0000000..7cbf32e
--- /dev/null
+++ b/python/ofagent/loxi/generic_util.py
@@ -0,0 +1,113 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior University
+# Copyright (c) 2011, 2012 Open Networking Foundation
+# Copyright (c) 2012, 2013 Big Switch Networks, Inc.
+# See the file LICENSE.pyloxi which should have been included in the source distribution
+"""
+Utility functions independent of the protocol version
+"""
+
+# Automatically generated by LOXI from template generic_util.py
+# Do not modify
+
+import loxi
+import struct
+
+def pack_list(values):
+ return "".join([x.pack() for x in values])
+
+def unpack_list(reader, deserializer):
+ """
+ The deserializer function should take an OFReader and return the new object.
+ """
+ entries = []
+ while not reader.is_empty():
+ entries.append(deserializer(reader))
+ return entries
+
+def pad_to(alignment, length):
+ """
+ Return a string of zero bytes that will pad a string of length 'length' to
+ a multiple of 'alignment'.
+ """
+ return "\x00" * ((length + alignment - 1)/alignment*alignment - length)
+
+class OFReader(object):
+ """
+ Cursor over a read-only buffer
+
+ OpenFlow messages are best thought of as a sequence of elements of
+ variable size, rather than a C-style struct with fixed offsets and
+ known field lengths. This class supports efficiently reading
+ fields sequentially and is intended to be used recursively by the
+ parsers of child objects which will implicitly update the offset.
+
+ buf: buffer object
+ start: initial position in the buffer
+ length: number of bytes after start
+ offset: distance from start
+ """
+ def __init__(self, buf, start=0, length=None):
+ self.buf = buf
+ self.start = start
+ if length is None:
+ self.length = len(buf) - start
+ else:
+ self.length = length
+ self.offset = 0
+
+ def read(self, fmt):
+ st = struct.Struct(fmt)
+ if self.offset + st.size > self.length:
+ raise loxi.ProtocolError("Buffer too short")
+ result = st.unpack_from(self.buf, self.start+self.offset)
+ self.offset += st.size
+ return result
+
+ def read_all(self):
+ s = self.buf[(self.start+self.offset):(self.start+self.length)]
+ assert(len(s) == self.length - self.offset)
+ self.offset = self.length
+ return s
+
+ def peek(self, fmt, offset=0):
+ st = struct.Struct(fmt)
+ if self.offset + offset + st.size > self.length:
+ raise loxi.ProtocolError("Buffer too short")
+ result = st.unpack_from(self.buf, self.start + self.offset + offset)
+ return result
+
+ def skip(self, length):
+ if self.offset + length > self.length:
+ raise loxi.ProtocolError("Buffer too short")
+ self.offset += length
+
+ def skip_align(self):
+ new_offset = (self.offset + 7) / 8 * 8
+ if new_offset > self.length:
+ raise loxi.ProtocolError("Buffer too short")
+ self.offset = new_offset
+
+ def is_empty(self):
+ return self.offset == self.length
+
+ # Used when parsing objects that have their own length fields
+ def slice(self, length, rewind=0):
+ if self.offset + length - rewind > self.length:
+ raise loxi.ProtocolError("Buffer too short")
+ reader = OFReader(self.buf, self.start + self.offset - rewind, length)
+ reader.skip(rewind)
+ self.offset += length - rewind
+ return reader