simple_mac_synthesis.py 文件源码

def compute_path_intents(self, fs):

        intent_list = []

        fs.path = nx.shortest_path(self.network_graph.graph,
                                   source=fs.ng_src_host.node_id,
                                   target=fs.ng_dst_host.node_id,
                                   weight='weight')

        # Get the port where the host connects at the first switch in the path
        link_ports_dict = self.network_graph.get_link_ports_dict(fs.ng_src_host.node_id, fs.ng_src_host.sw.node_id)
        in_port = link_ports_dict[fs.ng_src_host.sw.node_id]

        # This loop always starts at a switch
        for i in range(1, len(fs.path) - 1):

            link_ports_dict = self.network_graph.get_link_ports_dict(fs.path[i], fs.path[i+1])

            fwd_flow_match = deepcopy(fs.flow_match)

            mac_int = int(fs.ng_src_host.mac_addr.replace(":", ""), 16)
            fwd_flow_match["ethernet_source"] = int(mac_int)

            mac_int = int(fs.ng_dst_host.mac_addr.replace(":", ""), 16)
            fwd_flow_match["ethernet_destination"] = int(mac_int)

            intent = Intent("primary",
                            fwd_flow_match,
                            in_port,
                            link_ports_dict[fs.path[i]],
                            True)

            # Store the switch id in the intent
            intent.switch_id = fs.path[i]

            intent_list.append(intent)
            in_port = link_ports_dict[fs.path[i+1]]

        return intent_list