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#!/router/bin/python
import external_packages
from client_utils.packet_builder import CTRexPktBuilder
from collections import OrderedDict, namedtuple
from client_utils.yaml_utils import *
import dpkt
import struct
import copy
import os
StreamPack = namedtuple('StreamPack', ['stream_id', 'stream'])
class CStreamList(object):
def __init__(self):
self.streams_list = OrderedDict()
self.yaml_loader = CTRexYAMLLoader(os.path.join(os.path.dirname(os.path.realpath(__file__)),
"rpc_defaults.yaml"))
def generate_numbered_name (self, name):
prefix = name.rstrip('01234567890')
suffix = name[len(prefix):]
if suffix == "":
n = "_1"
else:
n = int(suffix) + 1
return prefix + str(n)
def append_stream(self, name, stream_obj):
assert isinstance(stream_obj, CStream)
# if name exists simply add numbered suffix to it
while name in self.streams_list:
name = self.generate_numbered_name(name)
self.streams_list[name]=stream_obj
return name
def remove_stream(self, name):
popped = self.streams_list.pop(name)
if popped:
for stream_name, stream in self.streams_list.items():
if stream.next_stream_id == name:
stream.next_stream_id = -1
try:
rx_stats_stream = getattr(stream.rx_stats, "stream_id")
if rx_stats_stream == name:
# if a referenced stream of rx_stats object deleted, revert to rx stats of current stream
setattr(stream.rx_stats, "stream_id", stream_name)
except AttributeError as e:
continue #
return popped
def export_to_yaml(self, file_path):
raise NotImplementedError("export_to_yaml method is not implemented, yet")
def load_yaml(self, file_path, multiplier=1):
# clear all existing streams linked to this object
self.streams_list.clear()
streams_data = load_yaml_to_obj(file_path)
assert isinstance(streams_data, list)
new_streams_data = []
for stream in streams_data:
stream_name = stream.get("name")
raw_stream = stream.get("stream")
if not stream_name or not raw_stream:
raise ValueError("Provided stream is not according to convention."
"Each stream must be provided as two keys: 'name' and 'stream'. "
"Provided item was:\n {stream}".format(stream))
new_stream_data = self.yaml_loader.validate_yaml(raw_stream,
"stream",
multiplier= multiplier)
new_streams_data.append(new_stream_data)
new_stream_obj = CStream()
new_stream_obj.load_data(**new_stream_data)
self.append_stream(stream_name, new_stream_obj)
return new_streams_data
def compile_streams(self):
# first, assign an id to each stream
stream_ids = {}
for idx, stream_name in enumerate(self.streams_list):
stream_ids[stream_name] = idx
# next, iterate over the streams and transform them from working with names to ids.
# with that build a new dict with old stream_name as the key, and StreamPack as the stored value
compiled_streams = {}
for stream_name, stream in self.streams_list.items():
tmp_stream = CStreamList._compile_single_stream(stream_name, stream, stream_ids)
compiled_streams[stream_name] = StreamPack(stream_ids.get(stream_name),
tmp_stream)
return compiled_streams
@staticmethod
def _compile_single_stream(stream_name, stream, id_dict):
# copy the old stream to temporary one, no change to class attributes
tmp_stream = copy.copy(stream)
next_stream_id = id_dict.get(getattr(tmp_stream, "next_stream_id"), -1)
try:
rx_stats_stream_id = id_dict.get(getattr(tmp_stream.rx_stats, "stream_id"),
id_dict.get(stream_name))
except AttributeError as e:
rx_stats_stream_id = id_dict.get(stream_name)
# assign resolved values to stream object
tmp_stream.next_stream_id = next_stream_id
tmp_stream.rx_stats.stream_id = rx_stats_stream_id
return tmp_stream
class CRxStats(object):
FIELDS = ["seq_enabled", "latency_enabled", "stream_id"]
def __init__(self, enabled=False, **kwargs):
self.enabled = bool(enabled)
for field in CRxStats.FIELDS:
setattr(self, field, kwargs.get(field, False))
def dump(self):
if self.enabled:
dump = {"enabled": True}
dump.update({k: getattr(self, k)
for k in CRxStats.FIELDS}
)
return dump
else:
return {"enabled": False}
class CTxMode(object):
"""docstring for CTxMode"""
GENERAL_FIELDS = ["type", "pps"]
FIELDS = {"continuous": [],
"single_burst": ["total_pkts"],
"multi_burst": ["pkts_per_burst", "ibg", "count"]}
def __init__(self, type, pps=0, **kwargs):
self._MODES = CTxMode.FIELDS.keys()
self.type = type
self.pps = pps
for field in CTxMode.FIELDS.get(self.type):
setattr(self, field, kwargs.get(field, 0))
@property
def type(self):
return self._type
@type.setter
def type(self, type):
if type not in self._MODES:
raise ValueError("Unknown TX mode ('{0}')has been initialized.".format(type))
self._type = type
self._reset_fields()
def dump(self):
dump = ({k: getattr(self, k)
for k in CTxMode.GENERAL_FIELDS
})
dump.update({k: getattr(self, k)
for k in CTxMode.FIELDS.get(self.type)
})
return dump
def _reset_fields(self):
for field in CTxMode.FIELDS.get(self.type):
setattr(self, field, 0)
class CStream(object):
"""docstring for CStream"""
FIELDS = ["enabled", "self_start", "next_stream_id", "isg", "mode", "rx_stats", "packet", "vm"]
def __init__(self):
self.is_loaded = False
self._is_compiled = False
for field in CStream.FIELDS:
setattr(self, field, None)
def load_data(self, **kwargs):
try:
for k in CStream.FIELDS:
if k == "rx_stats":
rx_stats_data = kwargs[k]
if isinstance(rx_stats_data, dict):
setattr(self, k, CRxStats(**rx_stats_data))
elif isinstance(rx_stats_data, CRxStats):
setattr(self, k, rx_stats_data)
elif k == "mode":
tx_mode = kwargs[k]
if isinstance(tx_mode, dict):
setattr(self, k, CTxMode(**tx_mode))
elif isinstance(tx_mode, CTxMode):
setattr(self, k, tx_mode)
elif k == "packet":
if isinstance(kwargs[k], CTRexPktBuilder):
if "vm" not in kwargs:
self.load_packet_obj(kwargs[k])
break # vm field check is skipped
else:
raise ValueError("When providing packet object with a CTRexPktBuilder, vm parameter "
"should not be supplied")
else:
binary = kwargs[k]["binary"]
if isinstance(binary, list):
setattr(self, k, kwargs[k])
elif isinstance(binary, str) and binary.endswith(".pcap"):
self.load_packet_from_pcap(binary, kwargs[k]["meta"])
else:
raise ValueError("Packet binary attribute has been loaded with unsupported value."
"Supported values are reference to pcap file with SINGLE packet, "
"or a list of unsigned-byte integers")
else:
setattr(self, k, kwargs[k])
self.is_loaded = True
except KeyError as e:
cause = e.args[0]
raise KeyError("The attribute '{0}' is missing as a field of the CStream object.\n"
"Loaded data must contain all of the following fields: {1}".format(cause, CStream.FIELDS))
def load_packet_obj(self, packet_obj):
assert isinstance(packet_obj, CTRexPktBuilder)
self.packet = packet_obj.dump_pkt()
self.vm = packet_obj.get_vm_data()
def load_packet_from_pcap(self, pcap_path, metadata=''):
with open(pcap_path, 'r') as f:
pcap = dpkt.pcap.Reader(f)
first_packet = True
for _, buf in pcap:
# this is an iterator, can't evaluate the number of files in advance
if first_packet:
self.packet = {"binary": [struct.unpack('B', buf[i:i+1])[0] # represent data as list of 0-255 ints
for i in range(0, len(buf))],
"meta": metadata} # meta data continues without a change.
first_packet = False
else:
raise ValueError("Provided pcap file contains more than single packet.")
# arrive here ONLY if pcap contained SINGLE packet
return
def dump(self):
if self.is_loaded:
dump = {}
for key in CStream.FIELDS:
try:
dump[key] = getattr(self, key).dump() # use dump() method of compound object, such TxMode
except AttributeError:
dump[key] = getattr(self, key)
return dump
else:
raise RuntimeError("CStream object isn't loaded with data. Use 'load_data' method.")
if __name__ == "__main__":
pass
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