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authorOle Troan <ot@cisco.com>2018-06-12 21:06:44 +0200
committerFlorin Coras <florin.coras@gmail.com>2018-06-22 03:00:45 +0000
commita7564e8004fd6d9a63eb0605f752f27a71403645 (patch)
tree15a97b1b7852dfbdee28c56e0d58218689126c1b /src/vpp-api/python/vpp_papi/vpp_serializer.py
parentd600ffe13a0f8f5d11fdea6ab7b24a364c968347 (diff)
Python API: Add enum and union support.
As well as a rewrite of the encoders/decoders to make it more readable and extensible. (Re-commit after fix to verify build.) Change-Id: Ic244d3cebe070bb2570491f8a24f4a1e203f889a Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vpp-api/python/vpp_papi/vpp_serializer.py')
-rw-r--r--src/vpp-api/python/vpp_papi/vpp_serializer.py343
1 files changed, 343 insertions, 0 deletions
diff --git a/src/vpp-api/python/vpp_papi/vpp_serializer.py b/src/vpp-api/python/vpp_papi/vpp_serializer.py
new file mode 100644
index 00000000000..7f5c5ace2dc
--- /dev/null
+++ b/src/vpp-api/python/vpp_papi/vpp_serializer.py
@@ -0,0 +1,343 @@
+#
+# Copyright (c) 2018 Cisco and/or its affiliates.
+# 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.
+#
+
+import struct
+import collections
+from enum import IntEnum
+import logging
+
+#
+# Set log-level in application by doing e.g.:
+# logger = logging.getLogger('vpp_serializer')
+# logger.setLevel(logging.DEBUG)
+#
+logger = logging.getLogger(__name__)
+
+
+class BaseTypes():
+ def __init__(self, type, elements=0):
+ base_types = {'u8': '>B',
+ 'u16': '>H',
+ 'u32': '>I',
+ 'i32': '>i',
+ 'u64': '>Q',
+ 'f64': '>d',
+ 'header': '>HI'}
+
+ if elements > 0 and type == 'u8':
+ self.packer = struct.Struct('>%ss' % elements)
+ else:
+ self.packer = struct.Struct(base_types[type])
+ self.size = self.packer.size
+ logger.debug('Adding {} with format: {}'
+ .format(type, base_types[type]))
+
+ def pack(self, data, kwargs=None):
+ logger.debug("Data: {} Format: {}".format(data, self.packer.format))
+ return self.packer.pack(data)
+
+ def unpack(self, data, offset, result=None):
+ logger.debug("@ {} Format: {}".format(offset, self.packer.format))
+ return self.packer.unpack_from(data, offset)[0]
+
+
+types = {}
+types['u8'] = BaseTypes('u8')
+types['u16'] = BaseTypes('u16')
+types['u32'] = BaseTypes('u32')
+types['i32'] = BaseTypes('i32')
+types['u64'] = BaseTypes('u64')
+types['f64'] = BaseTypes('f64')
+
+
+class FixedList_u8():
+ def __init__(self, name, field_type, num):
+ self.name = name
+ self.num = num
+ self.packer = BaseTypes(field_type, num)
+ self.size = self.packer.size
+
+ def pack(self, list, kwargs):
+ """Packs a fixed length bytestring. Left-pads with zeros
+ if input data is too short."""
+ logger.debug("Data: {}".format(list))
+
+ if len(list) > self.num:
+ raise ValueError('Fixed list length error for "{}", got: {}'
+ ' expected: {}'
+ .format(self.name, len(list), self.num))
+ return self.packer.pack(list)
+
+ def unpack(self, data, offset=0, result=None):
+ if len(data[offset:]) < self.num:
+ raise ValueError('Invalid array length for "{}" got {}'
+ ' expected {}'
+ .format(self.name, len(data), self.num))
+ return self.packer.unpack(data, offset)
+
+
+class FixedList():
+ def __init__(self, name, field_type, num):
+ self.num = num
+ self.packer = types[field_type]
+ self.size = self.packer.size * num
+
+ def pack(self, list, kwargs):
+ logger.debug("Data: {}".format(list))
+
+ if len(list) != self.num:
+ raise ValueError('Fixed list length error, got: {} expected: {}'
+ .format(len(list), self.num))
+ b = bytes()
+ for e in list:
+ b += self.packer.pack(e)
+ return b
+
+ def unpack(self, data, offset=0, result=None):
+ # Return a list of arguments
+ result = []
+ for e in range(self.num):
+ x = self.packer.unpack(data, offset)
+ result.append(x)
+ offset += self.packer.size
+ return result
+
+
+class VLAList():
+ def __init__(self, name, field_type, len_field_name, index):
+ self.index = index
+ self.packer = types[field_type]
+ self.size = self.packer.size
+ self.length_field = len_field_name
+
+ def pack(self, list, kwargs=None):
+ logger.debug("Data: {}".format(list))
+ if len(list) != kwargs[self.length_field]:
+ raise ValueError('Variable length error, got: {} expected: {}'
+ .format(len(list), kwargs[self.length_field]))
+ b = bytes()
+
+ # u8 array
+ if self.packer.size == 1:
+ return bytearray(list)
+
+ for e in list:
+ b += self.packer.pack(e)
+ return b
+
+ def unpack(self, data, offset=0, result=None):
+ logger.debug("Data: {} @ {} Result: {}"
+ .format(list, offset, result[self.index]))
+ # Return a list of arguments
+
+ # u8 array
+ if self.packer.size == 1:
+ if result[self.index] == 0:
+ return b''
+ p = BaseTypes('u8', result[self.index])
+ r = p.unpack(data, offset)
+ return r
+
+ r = []
+ for e in range(result[self.index]):
+ x = self.packer.unpack(data, offset)
+ r.append(x)
+ offset += self.packer.size
+ return r
+
+
+class VLAList_legacy():
+ def __init__(self, name, field_type):
+ self.packer = types[field_type]
+ self.size = self.packer.size
+
+ def pack(self, list, kwargs=None):
+ logger.debug("Data: {}".format(list))
+
+ if self.packer.size == 1:
+ return bytes(list)
+
+ b = bytes()
+ for e in list:
+ b += self.packer.pack(e)
+ return b
+
+ def unpack(self, data, offset=0, result=None):
+ # Return a list of arguments
+ if (len(data) - offset) % self.packer.size:
+ raise ValueError('Legacy Variable Length Array length mismatch.')
+ elements = int((len(data) - offset) / self.packer.size)
+ r = []
+ logger.debug("Legacy VLA: {} elements of size {}"
+ .format(elements, self.packer.size))
+ for e in range(elements):
+ x = self.packer.unpack(data, offset)
+ r.append(x)
+ offset += self.packer.size
+ return r
+
+
+class VPPEnumType():
+ def __init__(self, name, msgdef):
+ self.size = types['u32'].size
+ e_hash = {}
+ for f in msgdef:
+ if type(f) is dict and 'enumtype' in f:
+ if f['enumtype'] != 'u32':
+ raise NotImplementedError
+ continue
+ ename, evalue = f
+ e_hash[ename] = evalue
+ self.enum = IntEnum(name, e_hash)
+ types[name] = self
+ logger.debug('Adding enum {}'.format(name))
+
+ def __getattr__(self, name):
+ return self.enum[name]
+
+ def pack(self, data, kwargs=None):
+ logger.debug("Data: {}".format(data))
+ return types['u32'].pack(data, kwargs)
+
+ def unpack(self, data, offset=0, result=None):
+ x = types['u32'].unpack(data, offset)
+ return self.enum(x)
+
+
+class VPPUnionType():
+ def __init__(self, name, msgdef):
+ self.name = name
+ self.size = 0
+ self.maxindex = 0
+ fields = []
+ self.packers = collections.OrderedDict()
+ for i, f in enumerate(msgdef):
+ if type(f) is dict and 'crc' in f:
+ self.crc = f['crc']
+ continue
+ f_type, f_name = f
+ if f_type not in types:
+ logger.debug('Unknown union type {}'.format(f_type))
+ raise ValueError('Unknown message type {}'.format(f_type))
+ fields.append(f_name)
+ size = types[f_type].size
+ self.packers[f_name] = types[f_type]
+ if size > self.size:
+ self.size = size
+ self.maxindex = i
+
+ types[name] = self
+ self.tuple = collections.namedtuple(name, fields, rename=True)
+ logger.debug('Adding union {}'.format(name))
+
+ def pack(self, data, kwargs=None):
+ logger.debug("Data: {}".format(data))
+ for k, v in data.items():
+ logger.debug("Key: {} Value: {}".format(k, v))
+ b = self.packers[k].pack(v, kwargs)
+ offset = self.size - self.packers[k].size
+ break
+ r = bytearray(self.size)
+ r[offset:] = b
+ return r
+
+ def unpack(self, data, offset=0, result=None):
+ r = []
+ for k, p in self.packers.items():
+ union_offset = self.size - p.size
+ r.append(p.unpack(data, offset + union_offset))
+ return self.tuple._make(r)
+
+
+class VPPType():
+ # Set everything up to be able to pack / unpack
+ def __init__(self, name, msgdef):
+ self.name = name
+ self.msgdef = msgdef
+ self.packers = []
+ self.fields = []
+ self.fieldtypes = []
+ self.field_by_name = {}
+ size = 0
+ for i, f in enumerate(msgdef):
+ if type(f) is dict and 'crc' in f:
+ self.crc = f['crc']
+ continue
+ f_type, f_name = f[:2]
+ self.fields.append(f_name)
+ self.field_by_name[f_name] = None
+ self.fieldtypes.append(f_type)
+ if f_type not in types:
+ logger.debug('Unknown type {}'.format(f_type))
+ raise ValueError('Unknown message type {}'.format(f_type))
+ if len(f) == 3: # list
+ list_elements = f[2]
+ if list_elements == 0:
+ p = VLAList_legacy(f_name, f_type)
+ self.packers.append(p)
+ elif f_type == 'u8':
+ p = FixedList_u8(f_name, f_type, list_elements)
+ self.packers.append(p)
+ size += p.size
+ else:
+ p = FixedList(f_name, f_type, list_elements)
+ self.packers.append(p)
+ size += p.size
+ elif len(f) == 4: # Variable length list
+ # Find index of length field
+ length_index = self.fields.index(f[3])
+ p = VLAList(f_name, f_type, f[3], length_index)
+ self.packers.append(p)
+ else:
+ self.packers.append(types[f_type])
+ size += types[f_type].size
+
+ self.size = size
+ self.tuple = collections.namedtuple(name, self.fields, rename=True)
+ types[name] = self
+ logger.debug('Adding type {}'.format(name))
+
+ def pack(self, data, kwargs=None):
+ if not kwargs:
+ kwargs = data
+ logger.debug("Data: {}".format(data))
+ b = bytes()
+ for i, a in enumerate(self.fields):
+ if a not in data:
+ logger.debug("Argument {} not given, defaulting to 0"
+ .format(a))
+ b += b'\x00' * self.packers[i].size
+ continue
+
+ if isinstance(self.packers[i], VPPType):
+ b += self.packers[i].pack(data[a], kwargs[a])
+ else:
+ b += self.packers[i].pack(data[a], kwargs)
+ return b
+
+ def unpack(self, data, offset=0, result=None):
+ # Return a list of arguments
+ result = []
+ for p in self.packers:
+ x = p.unpack(data, offset, result)
+ if type(x) is tuple and len(x) == 1:
+ x = x[0]
+ result.append(x)
+ offset += p.size
+ return self.tuple._make(result)
+
+
+class VPPMessage(VPPType):
+ pass