python网络基础之单进程单线程实现非堵塞的http服务器

用单进程/单线程我们可以实现一个返回网页页面的http服务器，其中主要的是把堵塞变为非堵塞 套接字.setblocking(False)，来实现一个长连接

import socket
import re
import time


def main():
    # 创建套接字
    socket_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    socket_tcp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    # 绑定本地信息
    socket_tcp.bind(("", 7899))
    # 监听 listen
    socket_tcp.listen(128)
    # 把堵塞变为非堵塞
    socket_tcp.setblocking(False)
    # 创建空列表以存储用户
    client_list = list()

    while True:
        # time.sleep(0.5)
        try:

            # 拆包accept，等待客户来连接
            new_socket, add_socket = socket_tcp.accept()
            # 为连接进来的客户服务
        except Exception as ret:
            # print("没有用户连接")
            pass
        else:
            # print("有用户连接")
            # 服务器接收浏览器请求
            new_socket.setblocking(False)
            # 将连接到的用户添加到列表中
            client_list.append(new_socket)
        # 对列表进行遍历
        for client_sock in client_list:
            # 处理异常
            try:
                # 遍历到的用户进行接受信息
                requese = client_sock.recv(1024).decode("utf-8")
            except Exception as ret:
                # print("客户没有发送请求")
                pass
            else:
                # 如果已接受到信息
                if requese:
                    # print("客户已发送请求")
                    #对接受到的信息进行拆分，以定制规则
                    requess = requese.splitlines()
                    # print(requese)
                    print(requess)

                    file_name = "     "
                    res = re.match(r"[^/]+(/[^ ]*)", requess[0])

                    if res:
                        file_name = res.group(1)
                        if file_name == "/":
                            file_name = "/index.html"

                    """服务器响应浏览器"""
                    try:
                        file = open("./html" + file_name, "rb")
                    except:
                        respont = "HTTP/1.1 404 NOT FOUND \r\n"
                        respont += "\r\n"
                        respont += "
NOT FOUND 此目录
"
                        client_sock.send(respont.encode("gbk"))
                    else:
                        file_content = file.read()
                        file.close()

                        # 响应头HTTP/1.1 200 OK
                        respont = "HTTP/1.1 200 OK \r\n"

                        # 接受body的长度去实现长连接的http
                        respont += "Content-Length:%d\r\n" % len(file_content)
                        respont += "\r\n"

                        client_sock.send(respont.encode("utf-8"))

                        # 响应body
                        client_sock.send(file_content)
                else:

                    # 关闭套接字
                    client_sock.close()
                    client_list.remove(client_sock)

    # 关闭套接字
    socket_tcp.close()


if __name__ == '__main__':
    main()