python代码实现dsr协议

DSR（Dynamic Source Routing）是一种基于源路由的无线自组织网络路由协议，它适用于在移动自组织网络中进行路由选择。下面是Python代码实现DSR协议的示例：

import random

# 节点类
class Node:
    def __init__(self, id):
        self.id = id
        self.cache = {}  # 缓存
        self.routes = {}  # 路由表

    # 处理数据包
    def handle_packet(self, packet, network):
        if packet.dest == self.id:  # 如果数据包是发给自己的
            print(f"Node {self.id} received packet: {packet.data}")
            return

        if packet.dest in self.cache:  # 如果目的节点在缓存中
            print(f"Node {self.id} found packet in cache for {packet.dest}")
            cached_packet = self.cache[packet.dest]
            self.send_packet(cached_packet, network)
            return

        if packet.dest in self.routes:  # 如果目的节点在路由表中
            next_hop = self.routes[packet.dest]
            print(f"Node {self.id} forwarding packet to {next_hop}")
            self.send_packet(packet, network, next_hop)
            return

        print(f"Node {self.id} doesn't know how to reach {packet.dest}")

    # 发送数据包
    def send_packet(self, packet, network, dest=None):
        if dest is None:
            dest = packet.dest

        if dest == self.id:
            self.handle_packet(packet, network)
            return

        if dest in network.nodes:
            print(f"Node {self.id} sending packet to {dest}")
            network.nodes[dest].handle_packet(packet, network)
        else:
            print(f"Node {self.id} couldn't find node {dest}")

    # 更新路由表
    def update_routes(self, network):
        self.routes = {}

        for dest in network.nodes:
            if dest == self.id:
                continue

            path = self.find_route(dest, network)

            if path is not None:
                self.routes[dest] = path[0]

        print(f"Node {self.id} updated routes: {self.routes}")

    # 查找路由
    def find_route(self, dest, network):
        visited = {self.id}
        path = [self.id]

        while path[-1] != dest:
            current = path[-1]
            neighbors = network.get_neighbors(current)

            unvisited_neighbors = [n for n in neighbors if n not in visited]

            if not unvisited_neighbors:
                return None

            next_hop = random.choice(unvisited_neighbors)
            visited.add(next_hop)
            path.append(next_hop)

        return path


# 数据包类
class Packet:
    def __init__(self, src, dest, data):
        self.src = src
        self.dest = dest
        self.data = data


# 网络类
class Network:
    def __init__(self):
        self.nodes = {}

    # 添加节点
    def add_node(self, node):
        self.nodes[node.id] = node

    # 获取邻居节点
    def get_neighbors(self, node_id):
        neighbors = set()

        for dest in self.nodes:
            if dest == node_id:
                continue

            if node_id in self.nodes[dest].find_route(node_id, self):
                neighbors.add(dest)

        return neighbors


# 主函数
if __name__ == '__main__':
    # 创建网络
    network = Network()

    # 创建节点
    node1 = Node(1)
    node2 = Node(2)
    node3 = Node(3)
    node4 = Node(4)
    node5 = Node(5)

    # 添加节点到网络
    network.add_node(node1)
    network.add_node(node2)
    network.add_node(node3)
    network.add_node(node4)
    network.add_node(node5)

    # 建立连接
    node1.update_routes(network)
    node2.update_routes(network)
    node3.update_routes(network)
    node4.update_routes(network)
    node5.update_routes(network)

    # 发送数据包
    packet = Packet(1, 5, "Hello, world!")
    node1.send_packet(packet, network)

以上代码实现了一个简单的DSR协议，包括节点类、数据包类、网络类和主函数。在主函数中，我们创建了一个网络并添加了五个节点，然后建立了节点之间的连接，并发送了一个数据包。在节点类中，我们实现了处理数据包、发送数据包、更新路由表和查找路由等方法。这个实现是比较基础的，还可以进行优化和改进。