extras/packetforge/Edge.py

# Copyright (c) 2022 Intel 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.

from EdgeAction import *
import json


class Edge:
    def __init__(self):
        self.JSON = None
        self.Start = None
        self.End = None
        self.actionList = []

    def Create(jsonfile):
        f = open(jsonfile, "r", encoding="utf-8")
        token = json.load(f)

        if token == None:
            return None

        if token["type"] != "edge":
            return None

        edgeList = []

        startNodes = token["start"]
        endNodes = token["end"]

        if startNodes == None or endNodes == None:
            return None

        startTokens = startNodes.split(",")
        endTokens = endNodes.split(",")

        for start in startTokens:
            for end in endTokens:
                edge = Edge()

                edge.Start = start
                edge.End = end

                if "actions" in token:
                    for at in token["actions"]:
                        action = EdgeAction.Create(at)
                        if not action:
                            return None

                        edge.actionList.append(action)

                edge.JSON = jsonfile
                edgeList.append(edge)

        return edgeList

    def Apply(self, first, second):
        exp = []

        for i in range(len(self.actionList)):
            act = self.actionList[i]

            if act.FromStartObject == True:
                exp.append(first.GetValue(act.FromExpression))
            elif act.FromStartObject == False:
                exp.append(second.GetValue(act.FromExpression))
            else:
                exp.append(act.FromExpression)

        for i in range(len(exp)):
            act = self.actionList[i]

            if act.ToStartObject:
                first.SetFieldAuto(act.ToExpression, exp[i])
            else:
                second.SetFieldAuto(act.ToExpression, exp[i])

    def Actions(self):
        return self.actionList

    def Name(self):
        return self.Start + "_" + self.End